---

Appendix B Summary of Library Facilities

This appendix is a complete list of the facilities declared within the header files supplied with the GNU C Library. Each entry also lists the standard or other source from which each facility is derived, and tells you where in the manual you can find more information about how to use it.

long int a64l (const char *string)

stdlib.h (XPG): Encode Binary Data.

void abort (void)

stdlib.h (ISO): Aborting a Program.

int abs (int number)

stdlib.h (ISO): Absolute Value.

int accept (int socket, struct sockaddr *addr, socklen_t *length_ptr)

sys/socket.h (BSD): Accepting Connections.

int access (const char *filename, int how)

unistd.h (POSIX.1): Testing Permission to Access a File.

ACCOUNTING

utmp.h (SVID): Manipulating the User Accounting Database.

double acos (double x)

math.h (ISO): Inverse Trigonometric Functions.

float acosf (float x)

math.h (ISO): Inverse Trigonometric Functions.

double acosh (double x)

math.h (ISO): Hyperbolic Functions.

float acoshf (float x)

math.h (ISO): Hyperbolic Functions.

long double acoshl (long double x)

math.h (ISO): Hyperbolic Functions.

long double acosl (long double x)

math.h (ISO): Inverse Trigonometric Functions.

int addmntent (FILE *stream, const struct mntent *mnt)

mntent.h (BSD): The mtab file.

int adjtime (const struct timeval *delta, struct timeval *olddelta)

sys/time.h (BSD): High-Resolution Calendar.

int adjtimex (struct timex *timex)

sys/timex.h (GNU): High-Resolution Calendar.

AF_FILE

sys/socket.h (GNU): Address Formats.

AF_INET

sys/socket.h (BSD): Address Formats.

AF_INET6

sys/socket.h (IPv6 Basic API): Address Formats.

AF_LOCAL

sys/socket.h (POSIX): Address Formats.

AF_UNIX

sys/socket.h (BSD, Unix98): Address Formats.

AF_UNSPEC

sys/socket.h (BSD): Address Formats.

int aio_cancel (int fildes, struct aiocb *aiocbp)

aio.h (POSIX.1b): Cancellation of AIO Operations.

int aio_cancel64 (int fildes, struct aiocb64 *aiocbp)

aio.h (Unix98): Cancellation of AIO Operations.

int aio_error (const struct aiocb *aiocbp)

aio.h (POSIX.1b): Getting the Status of AIO Operations.

int aio_error64 (const struct aiocb64 *aiocbp)

aio.h (Unix98): Getting the Status of AIO Operations.

int aio_fsync (int op, struct aiocb *aiocbp)

aio.h (POSIX.1b): Getting into a Consistent State.

int aio_fsync64 (int op, struct aiocb64 *aiocbp)

aio.h (Unix98): Getting into a Consistent State.

void aio_init (const struct aioinit *init)

aio.h (GNU): How to optimize the AIO implementation.

int aio_read (struct aiocb *aiocbp)

aio.h (POSIX.1b): Asynchronous Read and Write Operations.

int aio_read64 (struct aiocb64 *aiocbp)

aio.h (Unix98): Asynchronous Read and Write Operations.

ssize_t aio_return (struct aiocb *aiocbp)

aio.h (POSIX.1b): Getting the Status of AIO Operations.

ssize_t aio_return64 (struct aiocb64 *aiocbp)

aio.h (Unix98): Getting the Status of AIO Operations.

int aio_suspend (const struct aiocb *const list[], int nent, const struct timespec *timeout)

aio.h (POSIX.1b): Getting into a Consistent State.

int aio_suspend64 (const struct aiocb64 *const list[], int nent, const struct timespec *timeout)

aio.h (Unix98): Getting into a Consistent State.

int aio_write (struct aiocb *aiocbp)

aio.h (POSIX.1b): Asynchronous Read and Write Operations.

int aio_write64 (struct aiocb64 *aiocbp)

aio.h (Unix98): Asynchronous Read and Write Operations.

unsigned int alarm (unsigned int seconds)

unistd.h (POSIX.1): Setting an Alarm.

void * aligned_alloc (size_t alignment, size_t size)

stdlib.h (stdlib.h): Allocating Aligned Memory Blocks.

void * alloca (size_t size)

stdlib.h (GNU, BSD): Automatic Storage with Variable Size.

int alphasort (const struct dirent **a, const struct dirent **b)

dirent.h (BSD/SVID): Scanning the Content of a Directory.

int alphasort64 (const struct dirent64 **a, const struct dirent **b)

dirent.h (GNU): Scanning the Content of a Directory.

tcflag_t ALTWERASE

termios.h (BSD): Local Modes.

int ARG_MAX

limits.h (POSIX.1): General Capacity Limits.

error_t argp_err_exit_status

argp.h (GNU): Argp Global Variables.

void argp_error (const struct argp_state *state, const char *fmt, …)

argp.h (GNU): Functions For Use in Argp Parsers.

int ARGP_ERR_UNKNOWN

argp.h (GNU): Argp Parser Functions.

void argp_failure (const struct argp_state *state, int status, int errnum, const char *fmt, …)

argp.h (GNU): Functions For Use in Argp Parsers.

void argp_help (const struct argp *argp, FILE *stream, unsigned flags, char *name)

argp.h (GNU): The argp_help Function.

ARGP_IN_ORDER

argp.h (GNU): Flags for argp_parse.

ARGP_KEY_ARG

argp.h (GNU): Special Keys for Argp Parser Functions.

ARGP_KEY_ARGS

argp.h (GNU): Special Keys for Argp Parser Functions.

ARGP_KEY_END

argp.h (GNU): Special Keys for Argp Parser Functions.

ARGP_KEY_ERROR

argp.h (GNU): Special Keys for Argp Parser Functions.

ARGP_KEY_FINI

argp.h (GNU): Special Keys for Argp Parser Functions.

ARGP_KEY_HELP_ARGS_DOC

argp.h (GNU): Special Keys for Argp Help Filter Functions.

ARGP_KEY_HELP_DUP_ARGS_NOTE

argp.h (GNU): Special Keys for Argp Help Filter Functions.

ARGP_KEY_HELP_EXTRA

argp.h (GNU): Special Keys for Argp Help Filter Functions.

ARGP_KEY_HELP_HEADER

argp.h (GNU): Special Keys for Argp Help Filter Functions.

ARGP_KEY_HELP_POST_DOC

argp.h (GNU): Special Keys for Argp Help Filter Functions.

ARGP_KEY_HELP_PRE_DOC

argp.h (GNU): Special Keys for Argp Help Filter Functions.

ARGP_KEY_INIT

argp.h (GNU): Special Keys for Argp Parser Functions.

ARGP_KEY_NO_ARGS

argp.h (GNU): Special Keys for Argp Parser Functions.

ARGP_KEY_SUCCESS

argp.h (GNU): Special Keys for Argp Parser Functions.

ARGP_LONG_ONLY

argp.h (GNU): Flags for argp_parse.

ARGP_NO_ARGS

argp.h (GNU): Flags for argp_parse.

ARGP_NO_ERRS

argp.h (GNU): Flags for argp_parse.

ARGP_NO_EXIT

argp.h (GNU): Flags for argp_parse.

ARGP_NO_HELP

argp.h (GNU): Flags for argp_parse.

error_t argp_parse (const struct argp *argp, int argc, char **argv, unsigned flags, int *arg_index, void *input)

argp.h (GNU): Suboptions.

ARGP_PARSE_ARGV0

argp.h (GNU): Flags for argp_parse.

const char * argp_program_bug_address

argp.h (GNU): Argp Global Variables.

const char * argp_program_version

argp.h (GNU): Argp Global Variables.

argp_program_version_hook

argp.h (GNU): Argp Global Variables.

ARGP_SILENT

argp.h (GNU): Flags for argp_parse.

void argp_state_help (const struct argp_state *state, FILE *stream, unsigned flags)

argp.h (GNU): Functions For Use in Argp Parsers.

void argp_usage (const struct argp_state *state)

argp.h (GNU): Functions For Use in Argp Parsers.

error_t argz_add (char **argz, size_t *argz_len, const char *str)

argz.h (GNU): Argz Functions.

error_t argz_add_sep (char **argz, size_t *argz_len, const char *str, int delim)

argz.h (GNU): Argz Functions.

error_t argz_append (char **argz, size_t *argz_len, const char *buf, size_t buf_len)

argz.h (GNU): Argz Functions.

size_t argz_count (const char *argz, size_t arg_len)

argz.h (GNU): Argz Functions.

error_t argz_create (char *const argv[], char **argz, size_t *argz_len)

argz.h (GNU): Argz Functions.

error_t argz_create_sep (const char *string, int sep, char **argz, size_t *argz_len)

argz.h (GNU): Argz Functions.

void argz_delete (char **argz, size_t *argz_len, char *entry)

argz.h (GNU): Argz Functions.

void argz_extract (const char *argz, size_t argz_len, char **argv)

argz.h (GNU): Argz Functions.

error_t argz_insert (char **argz, size_t *argz_len, char *before, const char *entry)

argz.h (GNU): Argz Functions.

char * argz_next (const char *argz, size_t argz_len, const char *entry)

argz.h (GNU): Argz Functions.

error_t argz_replace (char **argz, size_t *argz_len, const char *str, const char *with, unsigned *replace_count)

argz.h (GNU): Argz Functions.

void argz_stringify (char *argz, size_t len, int sep)

argz.h (GNU): Argz Functions.

char * asctime (const struct tm *brokentime)

time.h (ISO): Formatting Calendar Time.

char * asctime_r (const struct tm *brokentime, char *buffer)

time.h (POSIX.1c): Formatting Calendar Time.

double asin (double x)

math.h (ISO): Inverse Trigonometric Functions.

float asinf (float x)

math.h (ISO): Inverse Trigonometric Functions.

double asinh (double x)

math.h (ISO): Hyperbolic Functions.

float asinhf (float x)

math.h (ISO): Hyperbolic Functions.

long double asinhl (long double x)

math.h (ISO): Hyperbolic Functions.

long double asinl (long double x)

math.h (ISO): Inverse Trigonometric Functions.

int asprintf (char **ptr, const char *template, …)

stdio.h (GNU): Dynamically Allocating Formatted Output.

void assert (int expression)

assert.h (ISO): Explicitly Checking Internal Consistency.

void assert_perror (int errnum)

assert.h (GNU): Explicitly Checking Internal Consistency.

double atan (double x)

math.h (ISO): Inverse Trigonometric Functions.

double atan2 (double y, double x)

math.h (ISO): Inverse Trigonometric Functions.

float atan2f (float y, float x)

math.h (ISO): Inverse Trigonometric Functions.

long double atan2l (long double y, long double x)

math.h (ISO): Inverse Trigonometric Functions.

float atanf (float x)

math.h (ISO): Inverse Trigonometric Functions.

double atanh (double x)

math.h (ISO): Hyperbolic Functions.

float atanhf (float x)

math.h (ISO): Hyperbolic Functions.

long double atanhl (long double x)

math.h (ISO): Hyperbolic Functions.

long double atanl (long double x)

math.h (ISO): Inverse Trigonometric Functions.

int atexit (void (*function) (void))

stdlib.h (ISO): Cleanups on Exit.

double atof (const char *string)

stdlib.h (ISO): Parsing of Floats.

int atoi (const char *string)

stdlib.h (ISO): Parsing of Integers.

long int atol (const char *string)

stdlib.h (ISO): Parsing of Integers.

long long int atoll (const char *string)

stdlib.h (ISO): Parsing of Integers.

B0

termios.h (POSIX.1): Line Speed.

B110

termios.h (POSIX.1): Line Speed.

B115200

termios.h (GNU): Line Speed.

B1200

termios.h (POSIX.1): Line Speed.

B134

termios.h (POSIX.1): Line Speed.

B150

termios.h (POSIX.1): Line Speed.

B1800

termios.h (POSIX.1): Line Speed.

B19200

termios.h (POSIX.1): Line Speed.

B200

termios.h (POSIX.1): Line Speed.

B230400

termios.h (GNU): Line Speed.

B2400

termios.h (POSIX.1): Line Speed.

B300

termios.h (POSIX.1): Line Speed.

B38400

termios.h (POSIX.1): Line Speed.

B460800

termios.h (GNU): Line Speed.

B4800

termios.h (POSIX.1): Line Speed.

B50

termios.h (POSIX.1): Line Speed.

B57600

termios.h (GNU): Line Speed.

B600

termios.h (POSIX.1): Line Speed.

B75

termios.h (POSIX.1): Line Speed.

B9600

termios.h (POSIX.1): Line Speed.

int backtrace (void **buffer, int size)

execinfo.h (GNU): Backtraces.

char ** backtrace_symbols (void *const *buffer, int size)

execinfo.h (GNU): Backtraces.

void backtrace_symbols_fd (void *const *buffer, int size, int fd)

execinfo.h (GNU): Backtraces.

char * basename (char *path)

libgen.h (XPG): Finding Tokens in a String.

char * basename (const char *filename)

string.h (GNU): Finding Tokens in a String.

int BC_BASE_MAX

limits.h (POSIX.2): Utility Program Capacity Limits.

int BC_DIM_MAX

limits.h (POSIX.2): Utility Program Capacity Limits.

int bcmp (const void *a1, const void *a2, size_t size)

string.h (BSD): String/Array Comparison.

void bcopy (const void *from, void *to, size_t size)

string.h (BSD): Copying and Concatenation.

int BC_SCALE_MAX

limits.h (POSIX.2): Utility Program Capacity Limits.

int BC_STRING_MAX

limits.h (POSIX.2): Utility Program Capacity Limits.

int bind (int socket, struct sockaddr *addr, socklen_t length)

sys/socket.h (BSD): Setting the Address of a Socket.

char * bindtextdomain (const char *domainname, const char *dirname)

libintl.h (GNU): How to determine which catalog to be used.

char * bind_textdomain_codeset (const char *domainname, const char *codeset)

libintl.h (GNU): How to specify the output character set gettext uses.

blkcnt64_t

sys/types.h (Unix98): The meaning of the File Attributes.

blkcnt_t

sys/types.h (Unix98): The meaning of the File Attributes.

BOOT_TIME

utmp.h (SVID): Manipulating the User Accounting Database.

BOOT_TIME

utmpx.h (XPG4.2): XPG User Accounting Database Functions.

int brk (void *addr)

unistd.h (BSD): Resizing the Data Segment.

tcflag_t BRKINT

termios.h (POSIX.1): Input Modes.

void * bsearch (const void *key, const void *array, size_t count, size_t size, comparison_fn_t compare)

stdlib.h (ISO): Array Search Function.

wint_t btowc (int c)

wchar.h (ISO): Converting Single Characters.

int BUFSIZ

stdio.h (ISO): Controlling Which Kind of Buffering.

void bzero (void *block, size_t size)

string.h (BSD): Copying and Concatenation.

double cabs (complex double z)

complex.h (ISO): Absolute Value.

float cabsf (complex float z)

complex.h (ISO): Absolute Value.

long double cabsl (complex long double z)

complex.h (ISO): Absolute Value.

complex double cacos (complex double z)

complex.h (ISO): Inverse Trigonometric Functions.

complex float cacosf (complex float z)

complex.h (ISO): Inverse Trigonometric Functions.

complex double cacosh (complex double z)

complex.h (ISO): Hyperbolic Functions.

complex float cacoshf (complex float z)

complex.h (ISO): Hyperbolic Functions.

complex long double cacoshl (complex long double z)

complex.h (ISO): Hyperbolic Functions.

complex long double cacosl (complex long double z)

complex.h (ISO): Inverse Trigonometric Functions.

void * calloc (size_t count, size_t eltsize)

malloc.h, stdlib.h (ISO): Allocating Cleared Space.

char * canonicalize_file_name (const char *name)

stdlib.h (GNU): Symbolic Links.

double carg (complex double z)

complex.h (ISO): Projections, Conjugates, and Decomposing of Complex Numbers.

float cargf (complex float z)

complex.h (ISO): Projections, Conjugates, and Decomposing of Complex Numbers.

long double cargl (complex long double z)

complex.h (ISO): Projections, Conjugates, and Decomposing of Complex Numbers.

complex double casin (complex double z)

complex.h (ISO): Inverse Trigonometric Functions.

complex float casinf (complex float z)

complex.h (ISO): Inverse Trigonometric Functions.

complex double casinh (complex double z)

complex.h (ISO): Hyperbolic Functions.

complex float casinhf (complex float z)

complex.h (ISO): Hyperbolic Functions.

complex long double casinhl (complex long double z)

complex.h (ISO): Hyperbolic Functions.

complex long double casinl (complex long double z)

complex.h (ISO): Inverse Trigonometric Functions.

complex double catan (complex double z)

complex.h (ISO): Inverse Trigonometric Functions.

complex float catanf (complex float z)

complex.h (ISO): Inverse Trigonometric Functions.

complex double catanh (complex double z)

complex.h (ISO): Hyperbolic Functions.

complex float catanhf (complex float z)

complex.h (ISO): Hyperbolic Functions.

complex long double catanhl (complex long double z)

complex.h (ISO): Hyperbolic Functions.

complex long double catanl (complex long double z)

complex.h (ISO): Inverse Trigonometric Functions.

nl_catd catopen (const char *cat_name, int flag)

nl_types.h (X/Open): The catgets function family.

int cbc_crypt (char *key, char *blocks, unsigned len, unsigned mode, char *ivec)

rpc/des_crypt.h (SUNRPC): DES Encryption.

double cbrt (double x)

math.h (BSD): Exponentiation and Logarithms.

float cbrtf (float x)

math.h (BSD): Exponentiation and Logarithms.

long double cbrtl (long double x)

math.h (BSD): Exponentiation and Logarithms.

complex double ccos (complex double z)

complex.h (ISO): Trigonometric Functions.

complex float ccosf (complex float z)

complex.h (ISO): Trigonometric Functions.

complex double ccosh (complex double z)

complex.h (ISO): Hyperbolic Functions.

complex float ccoshf (complex float z)

complex.h (ISO): Hyperbolic Functions.

complex long double ccoshl (complex long double z)

complex.h (ISO): Hyperbolic Functions.

complex long double ccosl (complex long double z)

complex.h (ISO): Trigonometric Functions.

cc_t

termios.h (POSIX.1): Terminal Mode Data Types.

tcflag_t CCTS_OFLOW

termios.h (BSD): Control Modes.

double ceil (double x)

math.h (ISO): Rounding Functions.

float ceilf (float x)

math.h (ISO): Rounding Functions.

long double ceill (long double x)

math.h (ISO): Rounding Functions.

complex double cexp (complex double z)

complex.h (ISO): Exponentiation and Logarithms.

complex float cexpf (complex float z)

complex.h (ISO): Exponentiation and Logarithms.

complex long double cexpl (complex long double z)

complex.h (ISO): Exponentiation and Logarithms.

speed_t cfgetispeed (const struct termios *termios-p)

termios.h (POSIX.1): Line Speed.

speed_t cfgetospeed (const struct termios *termios-p)

termios.h (POSIX.1): Line Speed.

void cfmakeraw (struct termios *termios-p)

termios.h (BSD): Noncanonical Input.

void cfree (void *ptr)

stdlib.h (Sun): Freeing Memory Allocated with malloc.

int cfsetispeed (struct termios *termios-p, speed_t speed)

termios.h (POSIX.1): Line Speed.

int cfsetospeed (struct termios *termios-p, speed_t speed)

termios.h (POSIX.1): Line Speed.

int cfsetspeed (struct termios *termios-p, speed_t speed)

termios.h (BSD): Line Speed.

CHAR_BIT

limits.h (ISO): Computing the Width of an Integer Data Type.

CHAR_MAX

limits.h (ISO): Range of an Integer Type.

CHAR_MIN

limits.h (ISO): Range of an Integer Type.

int chdir (const char *filename)

unistd.h (POSIX.1): Working Directory.

int CHILD_MAX

limits.h (POSIX.1): General Capacity Limits.

int chmod (const char *filename, mode_t mode)

sys/stat.h (POSIX.1): Assigning File Permissions.

int chown (const char *filename, uid_t owner, gid_t group)

unistd.h (POSIX.1): File Owner.

tcflag_t CIGNORE

termios.h (BSD): Control Modes.

double cimag (complex double z)

complex.h (ISO): Projections, Conjugates, and Decomposing of Complex Numbers.

float cimagf (complex float z)

complex.h (ISO): Projections, Conjugates, and Decomposing of Complex Numbers.

long double cimagl (complex long double z)

complex.h (ISO): Projections, Conjugates, and Decomposing of Complex Numbers.

int clearenv (void)

stdlib.h (GNU): Environment Access.

void clearerr (FILE *stream)

stdio.h (ISO): Recovering from errors.

void clearerr_unlocked (FILE *stream)

stdio.h (GNU): Recovering from errors.

int CLK_TCK

time.h (POSIX.1): Processor Time Inquiry.

tcflag_t CLOCAL

termios.h (POSIX.1): Control Modes.

clock_t clock (void)

time.h (ISO): CPU Time Inquiry.

int CLOCKS_PER_SEC

time.h (ISO): CPU Time Inquiry.

clock_t

time.h (ISO): CPU Time Inquiry.

complex double clog (complex double z)

complex.h (ISO): Exponentiation and Logarithms.

complex double clog10 (complex double z)

complex.h (GNU): Exponentiation and Logarithms.

complex float clog10f (complex float z)

complex.h (GNU): Exponentiation and Logarithms.

complex long double clog10l (complex long double z)

complex.h (GNU): Exponentiation and Logarithms.

complex float clogf (complex float z)

complex.h (ISO): Exponentiation and Logarithms.

complex long double clogl (complex long double z)

complex.h (ISO): Exponentiation and Logarithms.

int close (int filedes)

unistd.h (POSIX.1): Opening and Closing Files.

int closedir (DIR *dirstream)

dirent.h (POSIX.1): Reading and Closing a Directory Stream.

void closelog (void)

syslog.h (BSD): closelog.

int COLL_WEIGHTS_MAX

limits.h (POSIX.2): Utility Program Capacity Limits.

size_t confstr (int parameter, char *buf, size_t len)

unistd.h (POSIX.2): String-Valued Parameters.

complex double conj (complex double z)

complex.h (ISO): Projections, Conjugates, and Decomposing of Complex Numbers.

complex float conjf (complex float z)

complex.h (ISO): Projections, Conjugates, and Decomposing of Complex Numbers.

complex long double conjl (complex long double z)

complex.h (ISO): Projections, Conjugates, and Decomposing of Complex Numbers.

int connect (int socket, struct sockaddr *addr, socklen_t length)

sys/socket.h (BSD): Making a Connection.

cookie_close_function_t

stdio.h (GNU): Custom Stream Hook Functions.

cookie_io_functions_t

stdio.h (GNU): Custom Streams and Cookies.

cookie_read_function_t

stdio.h (GNU): Custom Stream Hook Functions.

cookie_seek_function_t

stdio.h (GNU): Custom Stream Hook Functions.

cookie_write_function_t

stdio.h (GNU): Custom Stream Hook Functions.

double copysign (double x, double y)

math.h (ISO): Setting and modifying single bits of FP values.

float copysignf (float x, float y)

math.h (ISO): Setting and modifying single bits of FP values.

long double copysignl (long double x, long double y)

math.h (ISO): Setting and modifying single bits of FP values.

double cos (double x)

math.h (ISO): Trigonometric Functions.

float cosf (float x)

math.h (ISO): Trigonometric Functions.

double cosh (double x)

math.h (ISO): Hyperbolic Functions.

float coshf (float x)

math.h (ISO): Hyperbolic Functions.

long double coshl (long double x)

math.h (ISO): Hyperbolic Functions.

long double cosl (long double x)

math.h (ISO): Trigonometric Functions.

complex double cpow (complex double base, complex double power)

complex.h (ISO): Exponentiation and Logarithms.

complex float cpowf (complex float base, complex float power)

complex.h (ISO): Exponentiation and Logarithms.

complex long double cpowl (complex long double base, complex long double power)

complex.h (ISO): Exponentiation and Logarithms.

complex double cproj (complex double z)

complex.h (ISO): Projections, Conjugates, and Decomposing of Complex Numbers.

complex float cprojf (complex float z)

complex.h (ISO): Projections, Conjugates, and Decomposing of Complex Numbers.

complex long double cprojl (complex long double z)

complex.h (ISO): Projections, Conjugates, and Decomposing of Complex Numbers.

void CPU_CLR (int cpu, cpu_set_t *set)

sched.h (GNU): Limiting execution to certain CPUs.

int CPU_ISSET (int cpu, const cpu_set_t *set)

sched.h (GNU): Limiting execution to certain CPUs.

void CPU_SET (int cpu, cpu_set_t *set)

sched.h (GNU): Limiting execution to certain CPUs.

int CPU_SETSIZE

sched.h (GNU): Limiting execution to certain CPUs.

cpu_set_t

sched.h (GNU): Limiting execution to certain CPUs.

void CPU_ZERO (cpu_set_t *set)

sched.h (GNU): Limiting execution to certain CPUs.

tcflag_t CREAD

termios.h (POSIX.1): Control Modes.

double creal (complex double z)

complex.h (ISO): Projections, Conjugates, and Decomposing of Complex Numbers.

float crealf (complex float z)

complex.h (ISO): Projections, Conjugates, and Decomposing of Complex Numbers.

long double creall (complex long double z)

complex.h (ISO): Projections, Conjugates, and Decomposing of Complex Numbers.

int creat (const char *filename, mode_t mode)

fcntl.h (POSIX.1): Opening and Closing Files.

int creat64 (const char *filename, mode_t mode)

fcntl.h (Unix98): Opening and Closing Files.

tcflag_t CRTS_IFLOW

termios.h (BSD): Control Modes.

char * crypt (const char *key, const char *salt)

crypt.h (BSD, SVID): Encrypting Passwords.

char * crypt_r (const char *key, const char *salt, struct crypt_data * data)

crypt.h (GNU): Encrypting Passwords.

tcflag_t CS5

termios.h (POSIX.1): Control Modes.

tcflag_t CS6

termios.h (POSIX.1): Control Modes.

tcflag_t CS7

termios.h (POSIX.1): Control Modes.

tcflag_t CS8

termios.h (POSIX.1): Control Modes.

complex double csin (complex double z)

complex.h (ISO): Trigonometric Functions.

complex float csinf (complex float z)

complex.h (ISO): Trigonometric Functions.

complex double csinh (complex double z)

complex.h (ISO): Hyperbolic Functions.

complex float csinhf (complex float z)

complex.h (ISO): Hyperbolic Functions.

complex long double csinhl (complex long double z)

complex.h (ISO): Hyperbolic Functions.

complex long double csinl (complex long double z)

complex.h (ISO): Trigonometric Functions.

tcflag_t CSIZE

termios.h (POSIX.1): Control Modes.

_CS_LFS64_CFLAGS

unistd.h (Unix98): String-Valued Parameters.

_CS_LFS64_LDFLAGS

unistd.h (Unix98): String-Valued Parameters.

_CS_LFS64_LIBS

unistd.h (Unix98): String-Valued Parameters.

_CS_LFS64_LINTFLAGS

unistd.h (Unix98): String-Valued Parameters.

_CS_LFS_CFLAGS

unistd.h (Unix98): String-Valued Parameters.

_CS_LFS_LDFLAGS

unistd.h (Unix98): String-Valued Parameters.

_CS_LFS_LIBS

unistd.h (Unix98): String-Valued Parameters.

_CS_LFS_LINTFLAGS

unistd.h (Unix98): String-Valued Parameters.

_CS_PATH

unistd.h (POSIX.2): String-Valued Parameters.

complex double csqrt (complex double z)

complex.h (ISO): Exponentiation and Logarithms.

complex float csqrtf (complex float z)

complex.h (ISO): Exponentiation and Logarithms.

complex long double csqrtl (complex long double z)

complex.h (ISO): Exponentiation and Logarithms.

tcflag_t CSTOPB

termios.h (POSIX.1): Control Modes.

complex double ctan (complex double z)

complex.h (ISO): Trigonometric Functions.

complex float ctanf (complex float z)

complex.h (ISO): Trigonometric Functions.

complex double ctanh (complex double z)

complex.h (ISO): Hyperbolic Functions.

complex float ctanhf (complex float z)

complex.h (ISO): Hyperbolic Functions.

complex long double ctanhl (complex long double z)

complex.h (ISO): Hyperbolic Functions.

complex long double ctanl (complex long double z)

complex.h (ISO): Trigonometric Functions.

char * ctermid (char *string)

stdio.h (POSIX.1): Identifying the Controlling Terminal.

char * ctime (const time_t *time)

time.h (ISO): Formatting Calendar Time.

char * ctime_r (const time_t *time, char *buffer)

time.h (POSIX.1c): Formatting Calendar Time.

char * cuserid (char *string)

stdio.h (POSIX.1): Identifying Who Logged In.

int daylight

time.h (SVID): Functions and Variables for Time Zones.

DBL_DIG

float.h (ISO): Floating Point Parameters.

DBL_EPSILON

float.h (ISO): Floating Point Parameters.

DBL_MANT_DIG

float.h (ISO): Floating Point Parameters.

DBL_MAX

float.h (ISO): Floating Point Parameters.

DBL_MAX_10_EXP

float.h (ISO): Floating Point Parameters.

DBL_MAX_EXP

float.h (ISO): Floating Point Parameters.

DBL_MIN

float.h (ISO): Floating Point Parameters.

DBL_MIN_10_EXP

float.h (ISO): Floating Point Parameters.

DBL_MIN_EXP

float.h (ISO): Floating Point Parameters.

char * dcgettext (const char *domainname, const char *msgid, int category)

libintl.h (GNU): What has to be done to translate a message?.

char * dcngettext (const char *domain, const char *msgid1, const char *msgid2, unsigned long int n, int category)

libintl.h (GNU): Additional functions for more complicated situations.

DEAD_PROCESS

utmp.h (SVID): Manipulating the User Accounting Database.

DEAD_PROCESS

utmpx.h (XPG4.2): XPG User Accounting Database Functions.

_DEFAULT_SOURCE

(GNU): Feature Test Macros.

DES_DECRYPT

rpc/des_crypt.h (SUNRPC): DES Encryption.

DES_ENCRYPT

rpc/des_crypt.h (SUNRPC): DES Encryption.

DESERR_BADPARAM

rpc/des_crypt.h (SUNRPC): DES Encryption.

DESERR_HWERROR

rpc/des_crypt.h (SUNRPC): DES Encryption.

DESERR_NOHWDEVICE

rpc/des_crypt.h (SUNRPC): DES Encryption.

DESERR_NONE

rpc/des_crypt.h (SUNRPC): DES Encryption.

int DES_FAILED (int err)

rpc/des_crypt.h (SUNRPC): DES Encryption.

DES_HW

rpc/des_crypt.h (SUNRPC): DES Encryption.

void des_setparity (char *key)

rpc/des_crypt.h (SUNRPC): DES Encryption.

DES_SW

rpc/des_crypt.h (SUNRPC): DES Encryption.

dev_t

sys/types.h (POSIX.1): The meaning of the File Attributes.

char * dgettext (const char *domainname, const char *msgid)

libintl.h (GNU): What has to be done to translate a message?.

double difftime (time_t time1, time_t time0)

time.h (ISO): Elapsed Time.

DIR

dirent.h (POSIX.1): Opening a Directory Stream.

int dirfd (DIR *dirstream)

dirent.h (GNU): Opening a Directory Stream.

char * dirname (char *path)

libgen.h (XPG): Finding Tokens in a String.

div_t div (int numerator, int denominator)

stdlib.h (ISO): Integer Division.

div_t

stdlib.h (ISO): Integer Division.

char * dngettext (const char *domain, const char *msgid1, const char *msgid2, unsigned long int n)

libintl.h (GNU): Additional functions for more complicated situations.

double drand48 (void)

stdlib.h (SVID): SVID Random Number Function.

int drand48_r (struct drand48_data *buffer, double *result)

stdlib.h (GNU): SVID Random Number Function.

double drem (double numerator, double denominator)

math.h (BSD): Remainder Functions.

float dremf (float numerator, float denominator)

math.h (BSD): Remainder Functions.

long double dreml (long double numerator, long double denominator)

math.h (BSD): Remainder Functions.

mode_t DTTOIF (int dtype)

dirent.h (BSD): Format of a Directory Entry.

int dup (int old)

unistd.h (POSIX.1): Duplicating Descriptors.

int dup2 (int old, int new)

unistd.h (POSIX.1): Duplicating Descriptors.

int E2BIG

errno.h (POSIX.1: Argument list too long): Error Codes.

int EACCES

errno.h (POSIX.1: Permission denied): Error Codes.

int EADDRINUSE

errno.h (BSD: Address already in use): Error Codes.

int EADDRNOTAVAIL

errno.h (BSD: Cannot assign requested address): Error Codes.

int EADV

errno.h (Linux???: Advertise error): Error Codes.

int EAFNOSUPPORT

errno.h (BSD: Address family not supported by protocol): Error Codes.

int EAGAIN

errno.h (POSIX.1: Resource temporarily unavailable): Error Codes.

int EALREADY

errno.h (BSD: Operation already in progress): Error Codes.

int EAUTH

errno.h (BSD: Authentication error): Error Codes.

int EBACKGROUND

errno.h (GNU: Inappropriate operation for background process): Error Codes.

int EBADE

errno.h (Linux???: Invalid exchange): Error Codes.

int EBADF

errno.h (POSIX.1: Bad file descriptor): Error Codes.

int EBADFD

errno.h (Linux???: File descriptor in bad state): Error Codes.

int EBADMSG

errno.h (XOPEN: Bad message): Error Codes.

int EBADR

errno.h (Linux???: Invalid request descriptor): Error Codes.

int EBADRPC

errno.h (BSD: RPC struct is bad): Error Codes.

int EBADRQC

errno.h (Linux???: Invalid request code): Error Codes.

int EBADSLT

errno.h (Linux???: Invalid slot): Error Codes.

int EBFONT

errno.h (Linux???: Bad font file format): Error Codes.

int EBUSY

errno.h (POSIX.1: Device or resource busy): Error Codes.

int ECANCELED

errno.h (POSIX.1: Operation canceled): Error Codes.

int ecb_crypt (char *key, char *blocks, unsigned len, unsigned mode)

rpc/des_crypt.h (SUNRPC): DES Encryption.

int ECHILD

errno.h (POSIX.1: No child processes): Error Codes.

tcflag_t ECHO

termios.h (POSIX.1): Local Modes.

tcflag_t ECHOCTL

termios.h (BSD): Local Modes.

tcflag_t ECHOE

termios.h (POSIX.1): Local Modes.

tcflag_t ECHOK

termios.h (POSIX.1): Local Modes.

tcflag_t ECHOKE

termios.h (BSD): Local Modes.

tcflag_t ECHONL

termios.h (POSIX.1): Local Modes.

tcflag_t ECHOPRT

termios.h (BSD): Local Modes.

int ECHRNG

errno.h (Linux???: Channel number out of range): Error Codes.

int ECOMM

errno.h (Linux???: Communication error on send): Error Codes.

int ECONNABORTED

errno.h (BSD: Software caused connection abort): Error Codes.

int ECONNREFUSED

errno.h (BSD: Connection refused): Error Codes.

int ECONNRESET

errno.h (BSD: Connection reset by peer): Error Codes.

char * ecvt (double value, int ndigit, int *decpt, int *neg)

stdlib.h (SVID, Unix98): Old-fashioned System V number-to-string functions.

int ecvt_r (double value, int ndigit, int *decpt, int *neg, char *buf, size_t len)

stdlib.h (GNU): Old-fashioned System V number-to-string functions.

int ED

errno.h (GNU: ?): Error Codes.

int EDEADLK

errno.h (POSIX.1: Resource deadlock avoided): Error Codes.

int EDEADLOCK

errno.h (Linux???: File locking deadlock error): Error Codes.

int EDESTADDRREQ

errno.h (BSD: Destination address required): Error Codes.

int EDIED

errno.h (GNU: Translator died): Error Codes.

int EDOM

errno.h (ISO: Numerical argument out of domain): Error Codes.

int EDOTDOT

errno.h (Linux???: RFS specific error): Error Codes.

int EDQUOT

errno.h (BSD: Disk quota exceeded): Error Codes.

int EEXIST

errno.h (POSIX.1: File exists): Error Codes.

int EFAULT

errno.h (POSIX.1: Bad address): Error Codes.

int EFBIG

errno.h (POSIX.1: File too large): Error Codes.

int EFTYPE

errno.h (BSD: Inappropriate file type or format): Error Codes.

int EGRATUITOUS

errno.h (GNU: Gratuitous error): Error Codes.

int EGREGIOUS

errno.h (GNU: You really blew it this time): Error Codes.

int EHOSTDOWN

errno.h (BSD: Host is down): Error Codes.

int EHOSTUNREACH

errno.h (BSD: No route to host): Error Codes.

int EHWPOISON

errno.h (Linux: Memory page has hardware error): Error Codes.

int EIDRM

errno.h (XOPEN: Identifier removed): Error Codes.

int EIEIO

errno.h (GNU: Computer bought the farm): Error Codes.

int EILSEQ

errno.h (ISO: Invalid or incomplete multibyte or wide character): Error Codes.

int EINPROGRESS

errno.h (BSD: Operation now in progress): Error Codes.

int EINTR

errno.h (POSIX.1: Interrupted system call): Error Codes.

int EINVAL

errno.h (POSIX.1: Invalid argument): Error Codes.

int EIO

errno.h (POSIX.1: Input/output error): Error Codes.

int EISCONN

errno.h (BSD: Transport endpoint is already connected): Error Codes.

int EISDIR

errno.h (POSIX.1: Is a directory): Error Codes.

int EISNAM

errno.h (Linux???: Is a named type file): Error Codes.

int EKEYEXPIRED

errno.h (Linux: Key has expired): Error Codes.

int EKEYREJECTED

errno.h (Linux: Key was rejected by service): Error Codes.

int EKEYREVOKED

errno.h (Linux: Key has been revoked): Error Codes.

int EL2HLT

errno.h (Obsolete: Level 2 halted): Error Codes.

int EL2NSYNC

errno.h (Obsolete: Level 2 not synchronized): Error Codes.

int EL3HLT

errno.h (Obsolete: Level 3 halted): Error Codes.

int EL3RST

errno.h (Obsolete: Level 3 reset): Error Codes.

int ELIBACC

errno.h (Linux???: Can not access a needed shared library): Error Codes.

int ELIBBAD

errno.h (Linux???: Accessing a corrupted shared library): Error Codes.

int ELIBEXEC

errno.h (Linux???: Cannot exec a shared library directly): Error Codes.

int ELIBMAX

errno.h (Linux???: Attempting to link in too many shared libraries): Error Codes.

int ELIBSCN

errno.h (Linux???: .lib section in a.out corrupted): Error Codes.

int ELNRNG

errno.h (Linux???: Link number out of range): Error Codes.

int ELOOP

errno.h (BSD: Too many levels of symbolic links): Error Codes.

int EMEDIUMTYPE

errno.h (Linux???: Wrong medium type): Error Codes.

int EMFILE

errno.h (POSIX.1: Too many open files): Error Codes.

int EMLINK

errno.h (POSIX.1: Too many links): Error Codes.

EMPTY

utmp.h (SVID): Manipulating the User Accounting Database.

EMPTY

utmpx.h (XPG4.2): XPG User Accounting Database Functions.

int EMSGSIZE

errno.h (BSD: Message too long): Error Codes.

int EMULTIHOP

errno.h (XOPEN: Multihop attempted): Error Codes.

int ENAMETOOLONG

errno.h (POSIX.1: File name too long): Error Codes.

int ENAVAIL

errno.h (Linux???: No XENIX semaphores available): Error Codes.

void encrypt (char *block, int edflag)

crypt.h (BSD, SVID): DES Encryption.

void encrypt_r (char *block, int edflag, struct crypt_data * data)

crypt.h (GNU): DES Encryption.

void endfsent (void)

fstab.h (BSD): The fstab file.

void endgrent (void)

grp.h (SVID, BSD): Scanning the List of All Groups.

void endhostent (void)

netdb.h (BSD): Host Names.

int endmntent (FILE *stream)

mntent.h (BSD): The mtab file.

void endnetent (void)

netdb.h (BSD): Networks Database.

void endnetgrent (void)

netdb.h (BSD): Looking up one Netgroup.

void endprotoent (void)

netdb.h (BSD): Protocols Database.

void endpwent (void)

pwd.h (SVID, BSD): Scanning the List of All Users.

void endservent (void)

netdb.h (BSD): The Services Database.

void endutent (void)

utmp.h (SVID): Manipulating the User Accounting Database.

void endutxent (void)

utmpx.h (XPG4.2): XPG User Accounting Database Functions.

int ENEEDAUTH

errno.h (BSD: Need authenticator): Error Codes.

int ENETDOWN

errno.h (BSD: Network is down): Error Codes.

int ENETRESET

errno.h (BSD: Network dropped connection on reset): Error Codes.

int ENETUNREACH

errno.h (BSD: Network is unreachable): Error Codes.

int ENFILE

errno.h (POSIX.1: Too many open files in system): Error Codes.

int ENOANO

errno.h (Linux???: No anode): Error Codes.

int ENOBUFS

errno.h (BSD: No buffer space available): Error Codes.

int ENOCSI

errno.h (Linux???: No CSI structure available): Error Codes.

int ENODATA

errno.h (XOPEN: No data available): Error Codes.

int ENODEV

errno.h (POSIX.1: No such device): Error Codes.

int ENOENT

errno.h (POSIX.1: No such file or directory): Error Codes.

int ENOEXEC

errno.h (POSIX.1: Exec format error): Error Codes.

int ENOKEY

errno.h (Linux: Required key not available): Error Codes.

int ENOLCK

errno.h (POSIX.1: No locks available): Error Codes.

int ENOLINK

errno.h (XOPEN: Link has been severed): Error Codes.

int ENOMEDIUM

errno.h (Linux???: No medium found): Error Codes.

int ENOMEM

errno.h (POSIX.1: Cannot allocate memory): Error Codes.

int ENOMSG

errno.h (XOPEN: No message of desired type): Error Codes.

int ENONET

errno.h (Linux???: Machine is not on the network): Error Codes.

int ENOPKG

errno.h (Linux???: Package not installed): Error Codes.

int ENOPROTOOPT

errno.h (BSD: Protocol not available): Error Codes.

int ENOSPC

errno.h (POSIX.1: No space left on device): Error Codes.

int ENOSR

errno.h (XOPEN: Out of streams resources): Error Codes.

int ENOSTR

errno.h (XOPEN: Device not a stream): Error Codes.

int ENOSYS

errno.h (POSIX.1: Function not implemented): Error Codes.

int ENOTBLK

errno.h (BSD: Block device required): Error Codes.

int ENOTCONN

errno.h (BSD: Transport endpoint is not connected): Error Codes.

int ENOTDIR

errno.h (POSIX.1: Not a directory): Error Codes.

int ENOTEMPTY

errno.h (POSIX.1: Directory not empty): Error Codes.

int ENOTNAM

errno.h (Linux???: Not a XENIX named type file): Error Codes.

int ENOTRECOVERABLE

errno.h (Linux: State not recoverable): Error Codes.

int ENOTSOCK

errno.h (BSD: Socket operation on non-socket): Error Codes.

int ENOTSUP

errno.h (POSIX.1: Not supported): Error Codes.

int ENOTTY

errno.h (POSIX.1: Inappropriate ioctl for device): Error Codes.

int ENOTUNIQ

errno.h (Linux???: Name not unique on network): Error Codes.

char ** environ

unistd.h (POSIX.1): Environment Access.

error_t envz_add (char **envz, size_t *envz_len, const char *name, const char *value)

envz.h (GNU): Envz Functions.

char * envz_entry (const char *envz, size_t envz_len, const char *name)

envz.h (GNU): Envz Functions.

char * envz_get (const char *envz, size_t envz_len, const char *name)

envz.h (GNU): Envz Functions.

error_t envz_merge (char **envz, size_t *envz_len, const char *envz2, size_t envz2_len, int override)

envz.h (GNU): Envz Functions.

void envz_remove (char **envz, size_t *envz_len, const char *name)

envz.h (GNU): Envz Functions.

void envz_strip (char **envz, size_t *envz_len)

envz.h (GNU): Envz Functions.

int ENXIO

errno.h (POSIX.1: No such device or address): Error Codes.

int EOF

stdio.h (ISO): End-Of-File and Errors.

int EOPNOTSUPP

errno.h (BSD: Operation not supported): Error Codes.

int EOVERFLOW

errno.h (XOPEN: Value too large for defined data type): Error Codes.

int EOWNERDEAD

errno.h (Linux: Owner died): Error Codes.

int EPERM

errno.h (POSIX.1: Operation not permitted): Error Codes.

int EPFNOSUPPORT

errno.h (BSD: Protocol family not supported): Error Codes.

int EPIPE

errno.h (POSIX.1: Broken pipe): Error Codes.

int EPROCLIM

errno.h (BSD: Too many processes): Error Codes.

int EPROCUNAVAIL

errno.h (BSD: RPC bad procedure for program): Error Codes.

int EPROGMISMATCH

errno.h (BSD: RPC program version wrong): Error Codes.

int EPROGUNAVAIL

errno.h (BSD: RPC program not available): Error Codes.

int EPROTO

errno.h (XOPEN: Protocol error): Error Codes.

int EPROTONOSUPPORT

errno.h (BSD: Protocol not supported): Error Codes.

int EPROTOTYPE

errno.h (BSD: Protocol wrong type for socket): Error Codes.

int EQUIV_CLASS_MAX

limits.h (POSIX.2): Utility Program Capacity Limits.

double erand48 (unsigned short int xsubi[3])

stdlib.h (SVID): SVID Random Number Function.

int erand48_r (unsigned short int xsubi[3], struct drand48_data *buffer, double *result)

stdlib.h (GNU): SVID Random Number Function.

int ERANGE

errno.h (ISO: Numerical result out of range): Error Codes.

int EREMCHG

errno.h (Linux???: Remote address changed): Error Codes.

int EREMOTE

errno.h (BSD: Object is remote): Error Codes.

int EREMOTEIO

errno.h (Linux???: Remote I/O error): Error Codes.

int ERESTART

errno.h (Linux???: Interrupted system call should be restarted): Error Codes.

double erf (double x)

math.h (SVID): Special Functions.

double erfc (double x)

math.h (SVID): Special Functions.

float erfcf (float x)

math.h (SVID): Special Functions.

long double erfcl (long double x)

math.h (SVID): Special Functions.

float erff (float x)

math.h (SVID): Special Functions.

int ERFKILL

errno.h (Linux: Operation not possible due to RF-kill): Error Codes.

long double erfl (long double x)

math.h (SVID): Special Functions.

int EROFS

errno.h (POSIX.1: Read-only file system): Error Codes.

int ERPCMISMATCH

errno.h (BSD: RPC version wrong): Error Codes.

void err (int status, const char *format, …)

err.h (BSD): Error Messages.

volatile int errno

errno.h (ISO): Checking for Errors.

void error (int status, int errnum, const char *format, …)

error.h (GNU): Error Messages.

void error_at_line (int status, int errnum, const char *fname, unsigned int lineno, const char *format, …)

error.h (GNU): Error Messages.

unsigned int error_message_count

error.h (GNU): Error Messages.

int error_one_per_line

error.h (GNU): Error Messages.

void errx (int status, const char *format, …)

err.h (BSD): Error Messages.

int ESHUTDOWN

errno.h (BSD: Cannot send after transport endpoint shutdown): Error Codes.

int ESOCKTNOSUPPORT

errno.h (BSD: Socket type not supported): Error Codes.

int ESPIPE

errno.h (POSIX.1: Illegal seek): Error Codes.

int ESRCH

errno.h (POSIX.1: No such process): Error Codes.

int ESRMNT

errno.h (Linux???: Srmount error): Error Codes.

int ESTALE

errno.h (BSD: Stale file handle): Error Codes.

int ESTRPIPE

errno.h (Linux???: Streams pipe error): Error Codes.

int ETIME

errno.h (XOPEN: Timer expired): Error Codes.

int ETIMEDOUT

errno.h (BSD: Connection timed out): Error Codes.

int ETOOMANYREFS

errno.h (BSD: Too many references: cannot splice): Error Codes.

int ETXTBSY

errno.h (BSD: Text file busy): Error Codes.

int EUCLEAN

errno.h (Linux???: Structure needs cleaning): Error Codes.

int EUNATCH

errno.h (Linux???: Protocol driver not attached): Error Codes.

int EUSERS

errno.h (BSD: Too many users): Error Codes.

int EWOULDBLOCK

errno.h (BSD: Operation would block): Error Codes.

int EXDEV

errno.h (POSIX.1: Invalid cross-device link): Error Codes.

int execl (const char *filename, const char *arg0, …)

unistd.h (POSIX.1): Executing a File.

int execle (const char *filename, const char *arg0, …, char *const env[])

unistd.h (POSIX.1): Executing a File.

int execlp (const char *filename, const char *arg0, …)

unistd.h (POSIX.1): Executing a File.

int execv (const char *filename, char *const argv[])

unistd.h (POSIX.1): Executing a File.

int execve (const char *filename, char *const argv[], char *const env[])

unistd.h (POSIX.1): Executing a File.

int execvp (const char *filename, char *const argv[])

unistd.h (POSIX.1): Executing a File.

int EXFULL

errno.h (Linux???: Exchange full): Error Codes.

void _Exit (int status)

stdlib.h (ISO): Termination Internals.

void _exit (int status)

unistd.h (POSIX.1): Termination Internals.

void exit (int status)

stdlib.h (ISO): Normal Termination.

int EXIT_FAILURE

stdlib.h (ISO): Exit Status.

int EXIT_SUCCESS

stdlib.h (ISO): Exit Status.

double exp (double x)

math.h (ISO): Exponentiation and Logarithms.

double exp10 (double x)

math.h (GNU): Exponentiation and Logarithms.

float exp10f (float x)

math.h (GNU): Exponentiation and Logarithms.

long double exp10l (long double x)

math.h (GNU): Exponentiation and Logarithms.

double exp2 (double x)

math.h (ISO): Exponentiation and Logarithms.

float exp2f (float x)

math.h (ISO): Exponentiation and Logarithms.

long double exp2l (long double x)

math.h (ISO): Exponentiation and Logarithms.

float expf (float x)

math.h (ISO): Exponentiation and Logarithms.

long double expl (long double x)

math.h (ISO): Exponentiation and Logarithms.

double expm1 (double x)

math.h (ISO): Exponentiation and Logarithms.

float expm1f (float x)

math.h (ISO): Exponentiation and Logarithms.

long double expm1l (long double x)

math.h (ISO): Exponentiation and Logarithms.

int EXPR_NEST_MAX

limits.h (POSIX.2): Utility Program Capacity Limits.

double fabs (double number)

math.h (ISO): Absolute Value.

float fabsf (float number)

math.h (ISO): Absolute Value.

long double fabsl (long double number)

math.h (ISO): Absolute Value.

size_t __fbufsize (FILE *stream)

stdio_ext.h (GNU): Controlling Which Kind of Buffering.

int fchdir (int filedes)

unistd.h (XPG): Working Directory.

int fchmod (int filedes, mode_t mode)

sys/stat.h (BSD): Assigning File Permissions.

int fchown (int filedes, uid_t owner, gid_t group)

unistd.h (BSD): File Owner.

int fclose (FILE *stream)

stdio.h (ISO): Closing Streams.

int fcloseall (void)

stdio.h (GNU): Closing Streams.

int fcntl (int filedes, int command, …)

fcntl.h (POSIX.1): Control Operations on Files.

char * fcvt (double value, int ndigit, int *decpt, int *neg)

stdlib.h (SVID, Unix98): Old-fashioned System V number-to-string functions.

int fcvt_r (double value, int ndigit, int *decpt, int *neg, char *buf, size_t len)

stdlib.h (SVID, Unix98): Old-fashioned System V number-to-string functions.

int fdatasync (int fildes)

unistd.h (POSIX): Synchronizing I/O operations.

int FD_CLOEXEC

fcntl.h (POSIX.1): File Descriptor Flags.

void FD_CLR (int filedes, fd_set *set)

sys/types.h (BSD): Waiting for Input or Output.

double fdim (double x, double y)

math.h (ISO): Miscellaneous FP arithmetic functions.

float fdimf (float x, float y)

math.h (ISO): Miscellaneous FP arithmetic functions.

long double fdiml (long double x, long double y)

math.h (ISO): Miscellaneous FP arithmetic functions.

int FD_ISSET (int filedes, const fd_set *set)

sys/types.h (BSD): Waiting for Input or Output.

FILE * fdopen (int filedes, const char *opentype)

stdio.h (POSIX.1): Descriptors and Streams.

DIR * fdopendir (int fd)

dirent.h (GNU): Opening a Directory Stream.

void FD_SET (int filedes, fd_set *set)

sys/types.h (BSD): Waiting for Input or Output.

fd_set

sys/types.h (BSD): Waiting for Input or Output.

int FD_SETSIZE

sys/types.h (BSD): Waiting for Input or Output.

int F_DUPFD

fcntl.h (POSIX.1): Duplicating Descriptors.

void FD_ZERO (fd_set *set)

sys/types.h (BSD): Waiting for Input or Output.

int feclearexcept (int excepts)

fenv.h (ISO): Examining the FPU status word.

int fedisableexcept (int excepts)

fenv.h (GNU): Floating-Point Control Functions.

FE_DIVBYZERO

fenv.h (ISO): Examining the FPU status word.

FE_DOWNWARD

fenv.h (ISO): Rounding Modes.

int feenableexcept (int excepts)

fenv.h (GNU): Floating-Point Control Functions.

int fegetenv (fenv_t *envp)

fenv.h (ISO): Floating-Point Control Functions.

int fegetexcept (void)

fenv.h (GNU): Floating-Point Control Functions.

int fegetexceptflag (fexcept_t *flagp, int excepts)

fenv.h (ISO): Examining the FPU status word.

int fegetround (void)

fenv.h (ISO): Rounding Modes.

int feholdexcept (fenv_t *envp)

fenv.h (ISO): Floating-Point Control Functions.

FE_INEXACT

fenv.h (ISO): Examining the FPU status word.

FE_INVALID

fenv.h (ISO): Examining the FPU status word.

int feof (FILE *stream)

stdio.h (ISO): End-Of-File and Errors.

int feof_unlocked (FILE *stream)

stdio.h (GNU): End-Of-File and Errors.

FE_OVERFLOW

fenv.h (ISO): Examining the FPU status word.

int feraiseexcept (int excepts)

fenv.h (ISO): Examining the FPU status word.

int ferror (FILE *stream)

stdio.h (ISO): End-Of-File and Errors.

int ferror_unlocked (FILE *stream)

stdio.h (GNU): End-Of-File and Errors.

int fesetenv (const fenv_t *envp)

fenv.h (ISO): Floating-Point Control Functions.

int fesetexceptflag (const fexcept_t *flagp, int excepts)

fenv.h (ISO): Examining the FPU status word.

int fesetround (int round)

fenv.h (ISO): Rounding Modes.

int fetestexcept (int excepts)

fenv.h (ISO): Examining the FPU status word.

FE_TONEAREST

fenv.h (ISO): Rounding Modes.

FE_TOWARDZERO

fenv.h (ISO): Rounding Modes.

FE_UNDERFLOW

fenv.h (ISO): Examining the FPU status word.

int feupdateenv (const fenv_t *envp)

fenv.h (ISO): Floating-Point Control Functions.

FE_UPWARD

fenv.h (ISO): Rounding Modes.

int fflush (FILE *stream)

stdio.h (ISO): Flushing Buffers.

int fflush_unlocked (FILE *stream)

stdio.h (POSIX): Flushing Buffers.

int fgetc (FILE *stream)

stdio.h (ISO): Character Input.

int fgetc_unlocked (FILE *stream)

stdio.h (POSIX): Character Input.

int F_GETFD

fcntl.h (POSIX.1): File Descriptor Flags.

int F_GETFL

fcntl.h (POSIX.1): Getting and Setting File Status Flags.

struct group * fgetgrent (FILE *stream)

grp.h (SVID): Scanning the List of All Groups.

int fgetgrent_r (FILE *stream, struct group *result_buf, char *buffer, size_t buflen, struct group **result)

grp.h (GNU): Scanning the List of All Groups.

int F_GETLK

fcntl.h (POSIX.1): File Locks.

int F_GETOWN

fcntl.h (BSD): Interrupt-Driven Input.

int fgetpos (FILE *stream, fpos_t *position)

stdio.h (ISO): Portable File-Position Functions.

int fgetpos64 (FILE *stream, fpos64_t *position)

stdio.h (Unix98): Portable File-Position Functions.

struct passwd * fgetpwent (FILE *stream)

pwd.h (SVID): Scanning the List of All Users.

int fgetpwent_r (FILE *stream, struct passwd *result_buf, char *buffer, size_t buflen, struct passwd **result)

pwd.h (GNU): Scanning the List of All Users.

char * fgets (char *s, int count, FILE *stream)

stdio.h (ISO): Line-Oriented Input.

char * fgets_unlocked (char *s, int count, FILE *stream)

stdio.h (GNU): Line-Oriented Input.

wint_t fgetwc (FILE *stream)

wchar.h (ISO): Character Input.

wint_t fgetwc_unlocked (FILE *stream)

wchar.h (GNU): Character Input.

wchar_t * fgetws (wchar_t *ws, int count, FILE *stream)

wchar.h (ISO): Line-Oriented Input.

wchar_t * fgetws_unlocked (wchar_t *ws, int count, FILE *stream)

wchar.h (GNU): Line-Oriented Input.

FILE

stdio.h (ISO): Streams.

int FILENAME_MAX

stdio.h (ISO): Limits on File System Capacity.

int fileno (FILE *stream)

stdio.h (POSIX.1): Descriptors and Streams.

int fileno_unlocked (FILE *stream)

stdio.h (GNU): Descriptors and Streams.

int finite (double x)

math.h (BSD): Floating-Point Number Classification Functions.

int finitef (float x)

math.h (BSD): Floating-Point Number Classification Functions.

int finitel (long double x)

math.h (BSD): Floating-Point Number Classification Functions.

int __flbf (FILE *stream)

stdio_ext.h (GNU): Controlling Which Kind of Buffering.

void flockfile (FILE *stream)

stdio.h (POSIX): Streams and Threads.

double floor (double x)

math.h (ISO): Rounding Functions.

float floorf (float x)

math.h (ISO): Rounding Functions.

long double floorl (long double x)

math.h (ISO): Rounding Functions.

FLT_DIG

float.h (ISO): Floating Point Parameters.

FLT_EPSILON

float.h (ISO): Floating Point Parameters.

FLT_MANT_DIG

float.h (ISO): Floating Point Parameters.

FLT_MAX

float.h (ISO): Floating Point Parameters.

FLT_MAX_10_EXP

float.h (ISO): Floating Point Parameters.

FLT_MAX_EXP

float.h (ISO): Floating Point Parameters.

FLT_MIN

float.h (ISO): Floating Point Parameters.

FLT_MIN_10_EXP

float.h (ISO): Floating Point Parameters.

FLT_MIN_EXP

float.h (ISO): Floating Point Parameters.

FLT_RADIX

float.h (ISO): Floating Point Parameters.

FLT_ROUNDS

float.h (ISO): Floating Point Parameters.

void _flushlbf (void)

stdio_ext.h (GNU): Flushing Buffers.

tcflag_t FLUSHO

termios.h (BSD): Local Modes.

double fma (double x, double y, double z)

math.h (ISO): Miscellaneous FP arithmetic functions.

float fmaf (float x, float y, float z)

math.h (ISO): Miscellaneous FP arithmetic functions.

long double fmal (long double x, long double y, long double z)

math.h (ISO): Miscellaneous FP arithmetic functions.

double fmax (double x, double y)

math.h (ISO): Miscellaneous FP arithmetic functions.

float fmaxf (float x, float y)

math.h (ISO): Miscellaneous FP arithmetic functions.

long double fmaxl (long double x, long double y)

math.h (ISO): Miscellaneous FP arithmetic functions.

FILE * fmemopen (void *buf, size_t size, const char *opentype)

stdio.h (GNU): String Streams.

double fmin (double x, double y)

math.h (ISO): Miscellaneous FP arithmetic functions.

float fminf (float x, float y)

math.h (ISO): Miscellaneous FP arithmetic functions.

long double fminl (long double x, long double y)

math.h (ISO): Miscellaneous FP arithmetic functions.

double fmod (double numerator, double denominator)

math.h (ISO): Remainder Functions.

float fmodf (float numerator, float denominator)

math.h (ISO): Remainder Functions.

long double fmodl (long double numerator, long double denominator)

math.h (ISO): Remainder Functions.

int fmtmsg (long int classification, const char *label, int severity, const char *text, const char *action, const char *tag)

fmtmsg.h (XPG): Printing Formatted Messages.

int fnmatch (const char *pattern, const char *string, int flags)

fnmatch.h (POSIX.2): Wildcard Matching.

FNM_CASEFOLD

fnmatch.h (GNU): Wildcard Matching.

FNM_EXTMATCH

fnmatch.h (GNU): Wildcard Matching.

FNM_FILE_NAME

fnmatch.h (GNU): Wildcard Matching.

FNM_LEADING_DIR

fnmatch.h (GNU): Wildcard Matching.

FNM_NOESCAPE

fnmatch.h (POSIX.2): Wildcard Matching.

FNM_PATHNAME

fnmatch.h (POSIX.2): Wildcard Matching.

FNM_PERIOD

fnmatch.h (POSIX.2): Wildcard Matching.

int F_OFD_SETLK

fcntl.h (POSIX.1): Open File Description Locks.

int F_OFD_SETLKW

fcntl.h (POSIX.1): Open File Description Locks.

int F_OK

unistd.h (POSIX.1): Testing Permission to Access a File.

FILE * fopen (const char *filename, const char *opentype)

stdio.h (ISO): Opening Streams.

FILE * fopen64 (const char *filename, const char *opentype)

stdio.h (Unix98): Opening Streams.

FILE * fopencookie (void *cookie, const char *opentype, cookie_io_functions_t io-functions)

stdio.h (GNU): Custom Streams and Cookies.

int FOPEN_MAX

stdio.h (ISO): Opening Streams.

pid_t fork (void)

unistd.h (POSIX.1): Creating a Process.

int forkpty (int *amaster, char *name, const struct termios *termp, const struct winsize *winp)

pty.h (BSD): Opening a Pseudo-Terminal Pair.

long int fpathconf (int filedes, int parameter)

unistd.h (POSIX.1): Using pathconf.

int fpclassify (float-type x)

math.h (ISO): Floating-Point Number Classification Functions.

FPE_DECOVF_TRAP

signal.h (BSD): Program Error Signals.

FPE_FLTDIV_FAULT

signal.h (BSD): Program Error Signals.

FPE_FLTDIV_TRAP

signal.h (BSD): Program Error Signals.

FPE_FLTOVF_FAULT

signal.h (BSD): Program Error Signals.

FPE_FLTOVF_TRAP

signal.h (BSD): Program Error Signals.

FPE_FLTUND_FAULT

signal.h (BSD): Program Error Signals.

FPE_FLTUND_TRAP

signal.h (BSD): Program Error Signals.

FPE_INTDIV_TRAP

signal.h (BSD): Program Error Signals.

FPE_INTOVF_TRAP

signal.h (BSD): Program Error Signals.

size_t __fpending (FILE *stream)

stdio_ext.h (GNU): Controlling Which Kind of Buffering.

FPE_SUBRNG_TRAP

signal.h (BSD): Program Error Signals.

int FP_ILOGB0

math.h (ISO): Exponentiation and Logarithms.

int FP_ILOGBNAN

math.h (ISO): Exponentiation and Logarithms.

fpos64_t

stdio.h (Unix98): Portable File-Position Functions.

fpos_t

stdio.h (ISO): Portable File-Position Functions.

int fprintf (FILE *stream, const char *template, …)

stdio.h (ISO): Formatted Output Functions.

void __fpurge (FILE *stream)

stdio_ext.h (GNU): Flushing Buffers.

int fputc (int c, FILE *stream)

stdio.h (ISO): Simple Output by Characters or Lines.

int fputc_unlocked (int c, FILE *stream)

stdio.h (POSIX): Simple Output by Characters or Lines.

int fputs (const char *s, FILE *stream)

stdio.h (ISO): Simple Output by Characters or Lines.

int fputs_unlocked (const char *s, FILE *stream)

stdio.h (GNU): Simple Output by Characters or Lines.

wint_t fputwc (wchar_t wc, FILE *stream)

wchar.h (ISO): Simple Output by Characters or Lines.

wint_t fputwc_unlocked (wchar_t wc, FILE *stream)

wchar.h (POSIX): Simple Output by Characters or Lines.

int fputws (const wchar_t *ws, FILE *stream)

wchar.h (ISO): Simple Output by Characters or Lines.

int fputws_unlocked (const wchar_t *ws, FILE *stream)

wchar.h (GNU): Simple Output by Characters or Lines.

F_RDLCK

fcntl.h (POSIX.1): File Locks.

size_t fread (void *data, size_t size, size_t count, FILE *stream)

stdio.h (ISO): Block Input/Output.

int __freadable (FILE *stream)

stdio_ext.h (GNU): Opening Streams.

int __freading (FILE *stream)

stdio_ext.h (GNU): Opening Streams.

size_t fread_unlocked (void *data, size_t size, size_t count, FILE *stream)

stdio.h (GNU): Block Input/Output.

void free (void *ptr)

malloc.h, stdlib.h (ISO): Freeing Memory Allocated with malloc.

__free_hook

malloc.h (GNU): Memory Allocation Hooks.

FILE * freopen (const char *filename, const char *opentype, FILE *stream)

stdio.h (ISO): Opening Streams.

FILE * freopen64 (const char *filename, const char *opentype, FILE *stream)

stdio.h (Unix98): Opening Streams.

double frexp (double value, int *exponent)

math.h (ISO): Normalization Functions.

float frexpf (float value, int *exponent)

math.h (ISO): Normalization Functions.

long double frexpl (long double value, int *exponent)

math.h (ISO): Normalization Functions.

int fscanf (FILE *stream, const char *template, …)

stdio.h (ISO): Formatted Input Functions.

int fseek (FILE *stream, long int offset, int whence)

stdio.h (ISO): File Positioning.

int fseeko (FILE *stream, off_t offset, int whence)

stdio.h (Unix98): File Positioning.

int fseeko64 (FILE *stream, off64_t offset, int whence)

stdio.h (Unix98): File Positioning.

int F_SETFD

fcntl.h (POSIX.1): File Descriptor Flags.

int F_SETFL

fcntl.h (POSIX.1): Getting and Setting File Status Flags.

int F_SETLK

fcntl.h (POSIX.1): File Locks.

int F_SETLKW

fcntl.h (POSIX.1): File Locks.

int __fsetlocking (FILE *stream, int type)

stdio_ext.h (GNU): Streams and Threads.

int F_SETOWN

fcntl.h (BSD): Interrupt-Driven Input.

int fsetpos (FILE *stream, const fpos_t *position)

stdio.h (ISO): Portable File-Position Functions.

int fsetpos64 (FILE *stream, const fpos64_t *position)

stdio.h (Unix98): Portable File-Position Functions.

int fstat (int filedes, struct stat *buf)

sys/stat.h (POSIX.1): Reading the Attributes of a File.

int fstat64 (int filedes, struct stat64 *buf)

sys/stat.h (Unix98): Reading the Attributes of a File.

int fsync (int fildes)

unistd.h (POSIX): Synchronizing I/O operations.

long int ftell (FILE *stream)

stdio.h (ISO): File Positioning.

off_t ftello (FILE *stream)

stdio.h (Unix98): File Positioning.

off64_t ftello64 (FILE *stream)

stdio.h (Unix98): File Positioning.

int ftruncate (int fd, off_t length)

unistd.h (POSIX): File Size.

int ftruncate64 (int id, off64_t length)

unistd.h (Unix98): File Size.

int ftrylockfile (FILE *stream)

stdio.h (POSIX): Streams and Threads.

int ftw (const char *filename, __ftw_func_t func, int descriptors)

ftw.h (SVID): Working with Directory Trees.

int ftw64 (const char *filename, __ftw64_func_t func, int descriptors)

ftw.h (Unix98): Working with Directory Trees.

__ftw64_func_t

ftw.h (GNU): Working with Directory Trees.

__ftw_func_t

ftw.h (GNU): Working with Directory Trees.

F_UNLCK

fcntl.h (POSIX.1): File Locks.

void funlockfile (FILE *stream)

stdio.h (POSIX): Streams and Threads.

int futimes (int fd, const struct timeval tvp[2])

sys/time.h (BSD): File Times.

int fwide (FILE *stream, int mode)

wchar.h (ISO): Streams in Internationalized Applications.

int fwprintf (FILE *stream, const wchar_t *template, …)

wchar.h (ISO): Formatted Output Functions.

int __fwritable (FILE *stream)

stdio_ext.h (GNU): Opening Streams.

size_t fwrite (const void *data, size_t size, size_t count, FILE *stream)

stdio.h (ISO): Block Input/Output.

size_t fwrite_unlocked (const void *data, size_t size, size_t count, FILE *stream)

stdio.h (GNU): Block Input/Output.

int __fwriting (FILE *stream)

stdio_ext.h (GNU): Opening Streams.

F_WRLCK

fcntl.h (POSIX.1): File Locks.

int fwscanf (FILE *stream, const wchar_t *template, …)

wchar.h (ISO): Formatted Input Functions.

double gamma (double x)

math.h (SVID): Special Functions.

float gammaf (float x)

math.h (SVID): Special Functions.

long double gammal (long double x)

math.h (SVID): Special Functions.

void (*__gconv_end_fct) (struct gconv_step *)

gconv.h (GNU): The iconv Implementation in the GNU C Library.

int (*__gconv_fct) (struct __gconv_step *, struct __gconv_step_data *, const char **, const char *, size_t *, int)

gconv.h (GNU): The iconv Implementation in the GNU C Library.

int (*__gconv_init_fct) (struct __gconv_step *)

gconv.h (GNU): The iconv Implementation in the GNU C Library.

char * gcvt (double value, int ndigit, char *buf)

stdlib.h (SVID, Unix98): Old-fashioned System V number-to-string functions.

unsigned long int getauxval (unsigned long int type)

sys/auxv.h (sys/auxv.h): Auxiliary Vector.

long int get_avphys_pages (void)

sys/sysinfo.h (GNU): How to get information about the memory subsystem?.

int getc (FILE *stream)

stdio.h (ISO): Character Input.

int getchar (void)

stdio.h (ISO): Character Input.

int getchar_unlocked (void)

stdio.h (POSIX): Character Input.

int getcontext (ucontext_t *ucp)

ucontext.h (SVID): Complete Context Control.

int getc_unlocked (FILE *stream)

stdio.h (POSIX): Character Input.

char * get_current_dir_name (void)

unistd.h (GNU): Working Directory.

char * getcwd (char *buffer, size_t size)

unistd.h (POSIX.1): Working Directory.

struct tm * getdate (const char *string)

time.h (Unix98): A More User-friendly Way to Parse Times and Dates.

getdate_err

time.h (Unix98): A More User-friendly Way to Parse Times and Dates.

int getdate_r (const char *string, struct tm *tp)

time.h (GNU): A More User-friendly Way to Parse Times and Dates.

ssize_t getdelim (char **lineptr, size_t *n, int delimiter, FILE *stream)

stdio.h (GNU): Line-Oriented Input.

int getdomainnname (char *name, size_t length)

unistd.h (???): Host Identification.

gid_t getegid (void)

unistd.h (POSIX.1): Reading the Persona of a Process.

char * getenv (const char *name)

stdlib.h (ISO): Environment Access.

uid_t geteuid (void)

unistd.h (POSIX.1): Reading the Persona of a Process.

struct fstab * getfsent (void)

fstab.h (BSD): The fstab file.

struct fstab * getfsfile (const char *name)

fstab.h (BSD): The fstab file.

struct fstab * getfsspec (const char *name)

fstab.h (BSD): The fstab file.

gid_t getgid (void)

unistd.h (POSIX.1): Reading the Persona of a Process.

struct group * getgrent (void)

grp.h (SVID, BSD): Scanning the List of All Groups.

int getgrent_r (struct group *result_buf, char *buffer, size_t buflen, struct group **result)

grp.h (GNU): Scanning the List of All Groups.

struct group * getgrgid (gid_t gid)

grp.h (POSIX.1): Looking Up One Group.

int getgrgid_r (gid_t gid, struct group *result_buf, char *buffer, size_t buflen, struct group **result)

grp.h (POSIX.1c): Looking Up One Group.

struct group * getgrnam (const char *name)

grp.h (SVID, BSD): Looking Up One Group.

int getgrnam_r (const char *name, struct group *result_buf, char *buffer, size_t buflen, struct group **result)

grp.h (POSIX.1c): Looking Up One Group.

int getgrouplist (const char *user, gid_t group, gid_t *groups, int *ngroups)

grp.h (BSD): Setting the Group IDs.

int getgroups (int count, gid_t *groups)

unistd.h (POSIX.1): Reading the Persona of a Process.

struct hostent * gethostbyaddr (const void *addr, socklen_t length, int format)

netdb.h (BSD): Host Names.

int gethostbyaddr_r (const void *addr, socklen_t length, int format, struct hostent *restrict result_buf, char *restrict buf, size_t buflen, struct hostent **restrict result, int *restrict h_errnop)

netdb.h (GNU): Host Names.

struct hostent * gethostbyname (const char *name)

netdb.h (BSD): Host Names.

struct hostent * gethostbyname2 (const char *name, int af)

netdb.h (IPv6 Basic API): Host Names.

int gethostbyname2_r (const char *name, int af, struct hostent *restrict result_buf, char *restrict buf, size_t buflen, struct hostent **restrict result, int *restrict h_errnop)

netdb.h (GNU): Host Names.

int gethostbyname_r (const char *restrict name, struct hostent *restrict result_buf, char *restrict buf, size_t buflen, struct hostent **restrict result, int *restrict h_errnop)

netdb.h (GNU): Host Names.

struct hostent * gethostent (void)

netdb.h (BSD): Host Names.

long int gethostid (void)

unistd.h (BSD): Host Identification.

int gethostname (char *name, size_t size)

unistd.h (BSD): Host Identification.

int getitimer (int which, struct itimerval *old)

sys/time.h (BSD): Setting an Alarm.

ssize_t getline (char **lineptr, size_t *n, FILE *stream)

stdio.h (GNU): Line-Oriented Input.

int getloadavg (double loadavg[], int nelem)

stdlib.h (BSD): Learn about the processors available.

char * getlogin (void)

unistd.h (POSIX.1): Identifying Who Logged In.

struct mntent * getmntent (FILE *stream)

mntent.h (BSD): The mtab file.

struct mntent * getmntent_r (FILE *stream, struct mntent *result, char *buffer, int bufsize)

mntent.h (BSD): The mtab file.

struct netent * getnetbyaddr (uint32_t net, int type)

netdb.h (BSD): Networks Database.

struct netent * getnetbyname (const char *name)

netdb.h (BSD): Networks Database.

struct netent * getnetent (void)

netdb.h (BSD): Networks Database.

int getnetgrent (char **hostp, char **userp, char **domainp)

netdb.h (BSD): Looking up one Netgroup.

int getnetgrent_r (char **hostp, char **userp, char **domainp, char *buffer, size_t buflen)

netdb.h (GNU): Looking up one Netgroup.

int get_nprocs (void)

sys/sysinfo.h (GNU): Learn about the processors available.

int get_nprocs_conf (void)

sys/sysinfo.h (GNU): Learn about the processors available.

int getopt (int argc, char *const *argv, const char *options)

unistd.h (POSIX.2): Using the getopt function.

int getopt_long (int argc, char *const *argv, const char *shortopts, const struct option *longopts, int *indexptr)

getopt.h (GNU): Parsing Long Options with getopt_long.

int getopt_long_only (int argc, char *const *argv, const char *shortopts, const struct option *longopts, int *indexptr)

getopt.h (GNU): Parsing Long Options with getopt_long.

int getpagesize (void)

unistd.h (BSD): How to get information about the memory subsystem?.

char * getpass (const char *prompt)

unistd.h (BSD): Reading Passwords.

int getpeername (int socket, struct sockaddr *addr, socklen_t *length-ptr)

sys/socket.h (BSD): Who is Connected to Me?.

int getpgid (pid_t pid)

unistd.h (POSIX.1): Process Group Functions.

pid_t getpgrp (void)

unistd.h (POSIX.1): Process Group Functions.

long int get_phys_pages (void)

sys/sysinfo.h (GNU): How to get information about the memory subsystem?.

pid_t getpid (void)

unistd.h (POSIX.1): Process Identification.

pid_t getppid (void)

unistd.h (POSIX.1): Process Identification.

int getpriority (int class, int id)

sys/resource.h (BSD,POSIX): Functions For Traditional Scheduling.

struct protoent * getprotobyname (const char *name)

netdb.h (BSD): Protocols Database.

struct protoent * getprotobynumber (int protocol)

netdb.h (BSD): Protocols Database.

struct protoent * getprotoent (void)

netdb.h (BSD): Protocols Database.

int getpt (void)

stdlib.h (GNU): Allocating Pseudo-Terminals.

struct passwd * getpwent (void)

pwd.h (POSIX.1): Scanning the List of All Users.

int getpwent_r (struct passwd *result_buf, char *buffer, size_t buflen, struct passwd **result)

pwd.h (GNU): Scanning the List of All Users.

struct passwd * getpwnam (const char *name)

pwd.h (POSIX.1): Looking Up One User.

int getpwnam_r (const char *name, struct passwd *result_buf, char *buffer, size_t buflen, struct passwd **result)

pwd.h (POSIX.1c): Looking Up One User.

struct passwd * getpwuid (uid_t uid)

pwd.h (POSIX.1): Looking Up One User.

int getpwuid_r (uid_t uid, struct passwd *result_buf, char *buffer, size_t buflen, struct passwd **result)

pwd.h (POSIX.1c): Looking Up One User.

int getrlimit (int resource, struct rlimit *rlp)

sys/resource.h (BSD): Limiting Resource Usage.

int getrlimit64 (int resource, struct rlimit64 *rlp)

sys/resource.h (Unix98): Limiting Resource Usage.

int getrusage (int processes, struct rusage *rusage)

sys/resource.h (BSD): Resource Usage.

char * gets (char *s)

stdio.h (ISO): Line-Oriented Input.

struct servent * getservbyname (const char *name, const char *proto)

netdb.h (BSD): The Services Database.

struct servent * getservbyport (int port, const char *proto)

netdb.h (BSD): The Services Database.

struct servent * getservent (void)

netdb.h (BSD): The Services Database.

pid_t getsid (pid_t pid)

unistd.h (SVID): Process Group Functions.

int getsockname (int socket, struct sockaddr *addr, socklen_t *length-ptr)

sys/socket.h (BSD): Reading the Address of a Socket.

int getsockopt (int socket, int level, int optname, void *optval, socklen_t *optlen-ptr)

sys/socket.h (BSD): Socket Option Functions.

int getsubopt (char **optionp, char *const *tokens, char **valuep)

stdlib.h (stdlib.h): Suboptions Example.

char * gettext (const char *msgid)

libintl.h (GNU): What has to be done to translate a message?.

int gettimeofday (struct timeval *tp, struct timezone *tzp)

sys/time.h (BSD): High-Resolution Calendar.

uid_t getuid (void)

unistd.h (POSIX.1): Reading the Persona of a Process.

mode_t getumask (void)

sys/stat.h (GNU): Assigning File Permissions.

struct utmp * getutent (void)

utmp.h (SVID): Manipulating the User Accounting Database.

int getutent_r (struct utmp *buffer, struct utmp **result)

utmp.h (GNU): Manipulating the User Accounting Database.

struct utmp * getutid (const struct utmp *id)

utmp.h (SVID): Manipulating the User Accounting Database.

int getutid_r (const struct utmp *id, struct utmp *buffer, struct utmp **result)

utmp.h (GNU): Manipulating the User Accounting Database.

struct utmp * getutline (const struct utmp *line)

utmp.h (SVID): Manipulating the User Accounting Database.

int getutline_r (const struct utmp *line, struct utmp *buffer, struct utmp **result)

utmp.h (GNU): Manipulating the User Accounting Database.

int getutmp (const struct utmpx *utmpx, struct utmp *utmp)

utmp.h (GNU): XPG User Accounting Database Functions.

int getutmpx (const struct utmp *utmp, struct utmpx *utmpx)

utmp.h (GNU): XPG User Accounting Database Functions.

struct utmpx * getutxent (void)

utmpx.h (XPG4.2): XPG User Accounting Database Functions.

struct utmpx * getutxid (const struct utmpx *id)

utmpx.h (XPG4.2): XPG User Accounting Database Functions.

struct utmpx * getutxline (const struct utmpx *line)

utmpx.h (XPG4.2): XPG User Accounting Database Functions.

int getw (FILE *stream)

stdio.h (SVID): Character Input.

wint_t getwc (FILE *stream)

wchar.h (ISO): Character Input.

wint_t getwchar (void)

wchar.h (ISO): Character Input.

wint_t getwchar_unlocked (void)

wchar.h (GNU): Character Input.

wint_t getwc_unlocked (FILE *stream)

wchar.h (GNU): Character Input.

char * getwd (char *buffer)

unistd.h (BSD): Working Directory.

gid_t

sys/types.h (POSIX.1): Reading the Persona of a Process.

int glob (const char *pattern, int flags, int (*errfunc) (const char *filename, int error-code), glob_t *vector-ptr)

glob.h (POSIX.2): Calling glob.

int glob64 (const char *pattern, int flags, int (*errfunc) (const char *filename, int error-code), glob64_t *vector-ptr)

glob.h (GNU): Calling glob.

glob64_t

glob.h (GNU): Calling glob.

GLOB_ABORTED

glob.h (POSIX.2): Calling glob.

GLOB_ALTDIRFUNC

glob.h (GNU): More Flags for Globbing.

GLOB_APPEND

glob.h (POSIX.2): Flags for Globbing.

GLOB_BRACE

glob.h (GNU): More Flags for Globbing.

GLOB_DOOFFS

glob.h (POSIX.2): Flags for Globbing.

GLOB_ERR

glob.h (POSIX.2): Flags for Globbing.

void globfree (glob_t *pglob)

glob.h (POSIX.2): More Flags for Globbing.

void globfree64 (glob64_t *pglob)

glob.h (GNU): More Flags for Globbing.

GLOB_MAGCHAR

glob.h (GNU): More Flags for Globbing.

GLOB_MARK

glob.h (POSIX.2): Flags for Globbing.

GLOB_NOCHECK

glob.h (POSIX.2): Flags for Globbing.

GLOB_NOESCAPE

glob.h (POSIX.2): Flags for Globbing.

GLOB_NOMAGIC

glob.h (GNU): More Flags for Globbing.

GLOB_NOMATCH

glob.h (POSIX.2): Calling glob.

GLOB_NOSORT

glob.h (POSIX.2): Flags for Globbing.

GLOB_NOSPACE

glob.h (POSIX.2): Calling glob.

GLOB_ONLYDIR

glob.h (GNU): More Flags for Globbing.

GLOB_PERIOD

glob.h (GNU): More Flags for Globbing.

glob_t

glob.h (POSIX.2): Calling glob.

GLOB_TILDE

glob.h (GNU): More Flags for Globbing.

GLOB_TILDE_CHECK

glob.h (GNU): More Flags for Globbing.

struct tm * gmtime (const time_t *time)

time.h (ISO): Broken-down Time.

struct tm * gmtime_r (const time_t *time, struct tm *resultp)

time.h (POSIX.1c): Broken-down Time.

_GNU_SOURCE

(GNU): Feature Test Macros.

int grantpt (int filedes)

stdlib.h (SVID, XPG4.2): Allocating Pseudo-Terminals.

int gsignal (int signum)

signal.h (SVID): Signaling Yourself.

int gtty (int filedes, struct sgttyb *attributes)

sgtty.h (BSD): BSD Terminal Modes.

char * hasmntopt (const struct mntent *mnt, const char *opt)

mntent.h (BSD): The mtab file.

int hcreate (size_t nel)

search.h (SVID): The hsearch function..

int hcreate_r (size_t nel, struct hsearch_data *htab)

search.h (GNU): The hsearch function..

void hdestroy (void)

search.h (SVID): The hsearch function..

void hdestroy_r (struct hsearch_data *htab)

search.h (GNU): The hsearch function..

HOST_NOT_FOUND

netdb.h (BSD): Host Names.

ENTRY * hsearch (ENTRY item, ACTION action)

search.h (SVID): The hsearch function..

int hsearch_r (ENTRY item, ACTION action, ENTRY **retval, struct hsearch_data *htab)

search.h (GNU): The hsearch function..

uint32_t htonl (uint32_t hostlong)

netinet/in.h (BSD): Byte Order Conversion.

uint16_t htons (uint16_t hostshort)

netinet/in.h (BSD): Byte Order Conversion.

double HUGE_VAL

math.h (ISO): Error Reporting by Mathematical Functions.

float HUGE_VALF

math.h (ISO): Error Reporting by Mathematical Functions.

long double HUGE_VALL

math.h (ISO): Error Reporting by Mathematical Functions.

tcflag_t HUPCL

termios.h (POSIX.1): Control Modes.

double hypot (double x, double y)

math.h (ISO): Exponentiation and Logarithms.

float hypotf (float x, float y)

math.h (ISO): Exponentiation and Logarithms.

long double hypotl (long double x, long double y)

math.h (ISO): Exponentiation and Logarithms.

tcflag_t ICANON

termios.h (POSIX.1): Local Modes.

size_t iconv (iconv_t cd, char **inbuf, size_t *inbytesleft, char **outbuf, size_t *outbytesleft)

iconv.h (XPG2): Generic Character Set Conversion Interface.

int iconv_close (iconv_t cd)

iconv.h (XPG2): Generic Character Set Conversion Interface.

iconv_t iconv_open (const char *tocode, const char *fromcode)

iconv.h (XPG2): Generic Character Set Conversion Interface.

iconv_t

iconv.h (XPG2): Generic Character Set Conversion Interface.

tcflag_t ICRNL

termios.h (POSIX.1): Input Modes.

tcflag_t IEXTEN

termios.h (POSIX.1): Local Modes.

void if_freenameindex (struct if_nameindex *ptr)

net/if.h (IPv6 basic API): Interface Naming.

char * if_indextoname (unsigned int ifindex, char *ifname)

net/if.h (IPv6 basic API): Interface Naming.

struct if_nameindex * if_nameindex (void)

net/if.h (IPv6 basic API): Interface Naming.

unsigned int if_nametoindex (const char *ifname)

net/if.h (IPv6 basic API): Interface Naming.

size_t IFNAMSIZ

net/if.h (net/if.h): Interface Naming.

int IFTODT (mode_t mode)

dirent.h (BSD): Format of a Directory Entry.

tcflag_t IGNBRK

termios.h (POSIX.1): Input Modes.

tcflag_t IGNCR

termios.h (POSIX.1): Input Modes.

tcflag_t IGNPAR

termios.h (POSIX.1): Input Modes.

int ilogb (double x)

math.h (ISO): Exponentiation and Logarithms.

int ilogbf (float x)

math.h (ISO): Exponentiation and Logarithms.

int ilogbl (long double x)

math.h (ISO): Exponentiation and Logarithms.

intmax_t imaxabs (intmax_t number)

inttypes.h (ISO): Absolute Value.

tcflag_t IMAXBEL

termios.h (BSD): Input Modes.

imaxdiv_t imaxdiv (intmax_t numerator, intmax_t denominator)

inttypes.h (ISO): Integer Division.

imaxdiv_t

inttypes.h (ISO): Integer Division.

struct in6_addr in6addr_any

netinet/in.h (IPv6 basic API): Host Address Data Type.

struct in6_addr in6addr_loopback

netinet/in.h (IPv6 basic API): Host Address Data Type.

uint32_t INADDR_ANY

netinet/in.h (BSD): Host Address Data Type.

uint32_t INADDR_BROADCAST

netinet/in.h (BSD): Host Address Data Type.

uint32_t INADDR_LOOPBACK

netinet/in.h (BSD): Host Address Data Type.

uint32_t INADDR_NONE

netinet/in.h (BSD): Host Address Data Type.

char * index (const char *string, int c)

string.h (BSD): Search Functions.

uint32_t inet_addr (const char *name)

arpa/inet.h (BSD): Host Address Functions.

int inet_aton (const char *name, struct in_addr *addr)

arpa/inet.h (BSD): Host Address Functions.

uint32_t inet_lnaof (struct in_addr addr)

arpa/inet.h (BSD): Host Address Functions.

struct in_addr inet_makeaddr (uint32_t net, uint32_t local)

arpa/inet.h (BSD): Host Address Functions.

uint32_t inet_netof (struct in_addr addr)

arpa/inet.h (BSD): Host Address Functions.

uint32_t inet_network (const char *name)

arpa/inet.h (BSD): Host Address Functions.

char * inet_ntoa (struct in_addr addr)

arpa/inet.h (BSD): Host Address Functions.

const char * inet_ntop (int af, const void *cp, char *buf, socklen_t len)

arpa/inet.h (IPv6 basic API): Host Address Functions.

int inet_pton (int af, const char *cp, void *buf)

arpa/inet.h (IPv6 basic API): Host Address Functions.

float INFINITY

math.h (ISO): Infinity and NaN.

int initgroups (const char *user, gid_t group)

grp.h (BSD): Setting the Group IDs.

INIT_PROCESS

utmp.h (SVID): Manipulating the User Accounting Database.

INIT_PROCESS

utmpx.h (XPG4.2): XPG User Accounting Database Functions.

char * initstate (unsigned int seed, char *state, size_t size)

stdlib.h (BSD): BSD Random Number Functions.

int initstate_r (unsigned int seed, char *restrict statebuf, size_t statelen, struct random_data *restrict buf)

stdlib.h (GNU): BSD Random Number Functions.

tcflag_t INLCR

termios.h (POSIX.1): Input Modes.

int innetgr (const char *netgroup, const char *host, const char *user, const char *domain)

netdb.h (BSD): Testing for Netgroup Membership.

ino64_t

sys/types.h (Unix98): The meaning of the File Attributes.

ino_t

sys/types.h (POSIX.1): The meaning of the File Attributes.

tcflag_t INPCK

termios.h (POSIX.1): Input Modes.

INT_MAX

limits.h (ISO): Range of an Integer Type.

INT_MIN

limits.h (ISO): Range of an Integer Type.

int ioctl (int filedes, int command, …)

sys/ioctl.h (BSD): Generic I/O Control operations.

int _IOFBF

stdio.h (ISO): Controlling Which Kind of Buffering.

int _IOLBF

stdio.h (ISO): Controlling Which Kind of Buffering.

int _IONBF

stdio.h (ISO): Controlling Which Kind of Buffering.

int IPPORT_RESERVED

netinet/in.h (BSD): Internet Ports.

int IPPORT_USERRESERVED

netinet/in.h (BSD): Internet Ports.

int isalnum (int c)

ctype.h (ISO): Classification of Characters.

int isalpha (int c)

ctype.h (ISO): Classification of Characters.

int isascii (int c)

ctype.h (SVID, BSD): Classification of Characters.

int isatty (int filedes)

unistd.h (POSIX.1): Identifying Terminals.

int isblank (int c)

ctype.h (ISO): Classification of Characters.

int iscntrl (int c)

ctype.h (ISO): Classification of Characters.

int isdigit (int c)

ctype.h (ISO): Classification of Characters.

int isfinite (float-type x)

math.h (ISO): Floating-Point Number Classification Functions.

int isgraph (int c)

ctype.h (ISO): Classification of Characters.

int isgreater (real-floating x, real-floating y)

math.h (ISO): Floating-Point Comparison Functions.

int isgreaterequal (real-floating x, real-floating y)

math.h (ISO): Floating-Point Comparison Functions.

tcflag_t ISIG

termios.h (POSIX.1): Local Modes.

int isinf (double x)

math.h (BSD): Floating-Point Number Classification Functions.

int isinff (float x)

math.h (BSD): Floating-Point Number Classification Functions.

int isinfl (long double x)

math.h (BSD): Floating-Point Number Classification Functions.

int isless (real-floating x, real-floating y)

math.h (ISO): Floating-Point Comparison Functions.

int islessequal (real-floating x, real-floating y)

math.h (ISO): Floating-Point Comparison Functions.

int islessgreater (real-floating x, real-floating y)

math.h (ISO): Floating-Point Comparison Functions.

int islower (int c)

ctype.h (ISO): Classification of Characters.

int isnan (float-type x)

math.h (ISO): Floating-Point Number Classification Functions.

int isnan (double x)

math.h (BSD): Floating-Point Number Classification Functions.

int isnanf (float x)

math.h (BSD): Floating-Point Number Classification Functions.

int isnanl (long double x)

math.h (BSD): Floating-Point Number Classification Functions.

int isnormal (float-type x)

math.h (ISO): Floating-Point Number Classification Functions.

_ISOC99_SOURCE

(GNU): Feature Test Macros.

int isprint (int c)

ctype.h (ISO): Classification of Characters.

int ispunct (int c)

ctype.h (ISO): Classification of Characters.

int issignaling (float-type x)

math.h (GNU): Floating-Point Number Classification Functions.

int isspace (int c)

ctype.h (ISO): Classification of Characters.

tcflag_t ISTRIP

termios.h (POSIX.1): Input Modes.

int isunordered (real-floating x, real-floating y)

math.h (ISO): Floating-Point Comparison Functions.

int isupper (int c)

ctype.h (ISO): Classification of Characters.

int iswalnum (wint_t wc)

wctype.h (ISO): Character class determination for wide characters.

int iswalpha (wint_t wc)

wctype.h (ISO): Character class determination for wide characters.

int iswblank (wint_t wc)

wctype.h (ISO): Character class determination for wide characters.

int iswcntrl (wint_t wc)

wctype.h (ISO): Character class determination for wide characters.

int iswctype (wint_t wc, wctype_t desc)

wctype.h (ISO): Character class determination for wide characters.

int iswdigit (wint_t wc)

wctype.h (ISO): Character class determination for wide characters.

int iswgraph (wint_t wc)

wctype.h (ISO): Character class determination for wide characters.

int iswlower (wint_t wc)

ctype.h (ISO): Character class determination for wide characters.

int iswprint (wint_t wc)

wctype.h (ISO): Character class determination for wide characters.

int iswpunct (wint_t wc)

wctype.h (ISO): Character class determination for wide characters.

int iswspace (wint_t wc)

wctype.h (ISO): Character class determination for wide characters.

int iswupper (wint_t wc)

wctype.h (ISO): Character class determination for wide characters.

int iswxdigit (wint_t wc)

wctype.h (ISO): Character class determination for wide characters.

int isxdigit (int c)

ctype.h (ISO): Classification of Characters.

ITIMER_PROF

sys/time.h (BSD): Setting an Alarm.

ITIMER_REAL

sys/time.h (BSD): Setting an Alarm.

ITIMER_VIRTUAL

sys/time.h (BSD): Setting an Alarm.

tcflag_t IXANY

termios.h (BSD): Input Modes.

tcflag_t IXOFF

termios.h (POSIX.1): Input Modes.

tcflag_t IXON

termios.h (POSIX.1): Input Modes.

double j0 (double x)

math.h (SVID): Special Functions.

float j0f (float x)

math.h (SVID): Special Functions.

long double j0l (long double x)

math.h (SVID): Special Functions.

double j1 (double x)

math.h (SVID): Special Functions.

float j1f (float x)

math.h (SVID): Special Functions.

long double j1l (long double x)

math.h (SVID): Special Functions.

jmp_buf

setjmp.h (ISO): Details of Non-Local Exits.

double jn (int n, double x)

math.h (SVID): Special Functions.

float jnf (int n, float x)

math.h (SVID): Special Functions.

long double jnl (int n, long double x)

math.h (SVID): Special Functions.

long int jrand48 (unsigned short int xsubi[3])

stdlib.h (SVID): SVID Random Number Function.

int jrand48_r (unsigned short int xsubi[3], struct drand48_data *buffer, long int *result)

stdlib.h (GNU): SVID Random Number Function.

int kill (pid_t pid, int signum)

signal.h (POSIX.1): Signaling Another Process.

int killpg (int pgid, int signum)

signal.h (BSD): Signaling Another Process.

char * l64a (long int n)

stdlib.h (XPG): Encode Binary Data.

long int labs (long int number)

stdlib.h (ISO): Absolute Value.

LANG

locale.h (ISO): Locale Categories.

LC_ALL

locale.h (ISO): Locale Categories.

LC_COLLATE

locale.h (ISO): Locale Categories.

LC_CTYPE

locale.h (ISO): Locale Categories.

LC_MESSAGES

locale.h (XOPEN): Locale Categories.

LC_MONETARY

locale.h (ISO): Locale Categories.

LC_NUMERIC

locale.h (ISO): Locale Categories.

void lcong48 (unsigned short int param[7])

stdlib.h (SVID): SVID Random Number Function.

int lcong48_r (unsigned short int param[7], struct drand48_data *buffer)

stdlib.h (GNU): SVID Random Number Function.

int L_ctermid

stdio.h (POSIX.1): Identifying the Controlling Terminal.

LC_TIME

locale.h (ISO): Locale Categories.

int L_cuserid

stdio.h (POSIX.1): Identifying Who Logged In.

double ldexp (double value, int exponent)

math.h (ISO): Normalization Functions.

float ldexpf (float value, int exponent)

math.h (ISO): Normalization Functions.

long double ldexpl (long double value, int exponent)

math.h (ISO): Normalization Functions.

ldiv_t ldiv (long int numerator, long int denominator)

stdlib.h (ISO): Integer Division.

ldiv_t

stdlib.h (ISO): Integer Division.

void * lfind (const void *key, const void *base, size_t *nmemb, size_t size, comparison_fn_t compar)

search.h (SVID): Array Search Function.

double lgamma (double x)

math.h (SVID): Special Functions.

float lgammaf (float x)

math.h (SVID): Special Functions.

float lgammaf_r (float x, int *signp)

math.h (XPG): Special Functions.

long double lgammal (long double x)

math.h (SVID): Special Functions.

long double lgammal_r (long double x, int *signp)

math.h (XPG): Special Functions.

double lgamma_r (double x, int *signp)

math.h (XPG): Special Functions.

L_INCR

sys/file.h (BSD): File Positioning.

int LINE_MAX

limits.h (POSIX.2): Utility Program Capacity Limits.

int link (const char *oldname, const char *newname)

unistd.h (POSIX.1): Hard Links.

int LINK_MAX

limits.h, (optional) (POSIX.1): Limits on File System Capacity.

int lio_listio (int mode, struct aiocb *const list[], int nent, struct sigevent *sig)

aio.h (POSIX.1b): Asynchronous Read and Write Operations.

int lio_listio64 (int mode, struct aiocb64 *const list[], int nent, struct sigevent *sig)

aio.h (Unix98): Asynchronous Read and Write Operations.

int listen (int socket, int n)

sys/socket.h (BSD): Listening for Connections.

long long int llabs (long long int number)

stdlib.h (ISO): Absolute Value.

lldiv_t lldiv (long long int numerator, long long int denominator)

stdlib.h (ISO): Integer Division.

lldiv_t

stdlib.h (ISO): Integer Division.

LLONG_MAX

limits.h (ISO): Range of an Integer Type.

LLONG_MIN

limits.h (ISO): Range of an Integer Type.

long long int llrint (double x)

math.h (ISO): Rounding Functions.

long long int llrintf (float x)

math.h (ISO): Rounding Functions.

long long int llrintl (long double x)

math.h (ISO): Rounding Functions.

long long int llround (double x)

math.h (ISO): Rounding Functions.

long long int llroundf (float x)

math.h (ISO): Rounding Functions.

long long int llroundl (long double x)

math.h (ISO): Rounding Functions.

struct lconv * localeconv (void)

locale.h (ISO): localeconv: It is portable but ….

struct tm * localtime (const time_t *time)

time.h (ISO): Broken-down Time.

struct tm * localtime_r (const time_t *time, struct tm *resultp)

time.h (POSIX.1c): Broken-down Time.

double log (double x)

math.h (ISO): Exponentiation and Logarithms.

double log10 (double x)

math.h (ISO): Exponentiation and Logarithms.

float log10f (float x)

math.h (ISO): Exponentiation and Logarithms.

long double log10l (long double x)

math.h (ISO): Exponentiation and Logarithms.

double log1p (double x)

math.h (ISO): Exponentiation and Logarithms.

float log1pf (float x)

math.h (ISO): Exponentiation and Logarithms.

long double log1pl (long double x)

math.h (ISO): Exponentiation and Logarithms.

double log2 (double x)

math.h (ISO): Exponentiation and Logarithms.

float log2f (float x)

math.h (ISO): Exponentiation and Logarithms.

long double log2l (long double x)

math.h (ISO): Exponentiation and Logarithms.

double logb (double x)

math.h (ISO): Exponentiation and Logarithms.

float logbf (float x)

math.h (ISO): Exponentiation and Logarithms.

long double logbl (long double x)

math.h (ISO): Exponentiation and Logarithms.

float logf (float x)

math.h (ISO): Exponentiation and Logarithms.

void login (const struct utmp *entry)

utmp.h (BSD): Logging In and Out.

LOGIN_PROCESS

utmp.h (SVID): Manipulating the User Accounting Database.

LOGIN_PROCESS

utmpx.h (XPG4.2): XPG User Accounting Database Functions.

int login_tty (int filedes)

utmp.h (BSD): Logging In and Out.

long double logl (long double x)

math.h (ISO): Exponentiation and Logarithms.

int logout (const char *ut_line)

utmp.h (BSD): Logging In and Out.

void logwtmp (const char *ut_line, const char *ut_name, const char *ut_host)

utmp.h (BSD): Logging In and Out.

void longjmp (jmp_buf state, int value)

setjmp.h (ISO): Details of Non-Local Exits.

LONG_LONG_MAX

limits.h (GNU): Range of an Integer Type.

LONG_LONG_MIN

limits.h (GNU): Range of an Integer Type.

LONG_MAX

limits.h (ISO): Range of an Integer Type.

LONG_MIN

limits.h (ISO): Range of an Integer Type.

long int lrand48 (void)

stdlib.h (SVID): SVID Random Number Function.

int lrand48_r (struct drand48_data *buffer, long int *result)

stdlib.h (GNU): SVID Random Number Function.

long int lrint (double x)

math.h (ISO): Rounding Functions.

long int lrintf (float x)

math.h (ISO): Rounding Functions.

long int lrintl (long double x)

math.h (ISO): Rounding Functions.

long int lround (double x)

math.h (ISO): Rounding Functions.

long int lroundf (float x)

math.h (ISO): Rounding Functions.

long int lroundl (long double x)

math.h (ISO): Rounding Functions.

void * lsearch (const void *key, void *base, size_t *nmemb, size_t size, comparison_fn_t compar)

search.h (SVID): Array Search Function.

off_t lseek (int filedes, off_t offset, int whence)

unistd.h (POSIX.1): Setting the File Position of a Descriptor.

off64_t lseek64 (int filedes, off64_t offset, int whence)

unistd.h (Unix98): Setting the File Position of a Descriptor.

L_SET

sys/file.h (BSD): File Positioning.

int lstat (const char *filename, struct stat *buf)

sys/stat.h (BSD): Reading the Attributes of a File.

int lstat64 (const char *filename, struct stat64 *buf)

sys/stat.h (Unix98): Reading the Attributes of a File.

int L_tmpnam

stdio.h (ISO): Temporary Files.

int lutimes (const char *filename, const struct timeval tvp[2])

sys/time.h (BSD): File Times.

L_XTND

sys/file.h (BSD): File Positioning.

int madvise (void *addr, size_t length, int advice)

sys/mman.h (POSIX): Memory-mapped I/O.

void makecontext (ucontext_t *ucp, void (*func) (void), int argc, …)

ucontext.h (SVID): Complete Context Control.

struct mallinfo mallinfo (void)

malloc.h (SVID): Statistics for Memory Allocation with malloc.

void * malloc (size_t size)

malloc.h, stdlib.h (ISO): Basic Memory Allocation.

__malloc_hook

malloc.h (GNU): Memory Allocation Hooks.

__malloc_initialize_hook

malloc.h (GNU): Memory Allocation Hooks.

int MAX_CANON

limits.h (POSIX.1): Limits on File System Capacity.

int MAX_INPUT

limits.h (POSIX.1): Limits on File System Capacity.

int MAXNAMLEN

dirent.h (BSD): Limits on File System Capacity.

int MAXSYMLINKS

sys/param.h (BSD): Symbolic Links.

int MB_CUR_MAX

stdlib.h (ISO): Selecting the conversion and its properties.

int mblen (const char *string, size_t size)

stdlib.h (ISO): Non-reentrant Conversion of Single Characters.

int MB_LEN_MAX

limits.h (ISO): Selecting the conversion and its properties.

size_t mbrlen (const char *restrict s, size_t n, mbstate_t *ps)

wchar.h (ISO): Converting Single Characters.

size_t mbrtowc (wchar_t *restrict pwc, const char *restrict s, size_t n, mbstate_t *restrict ps)

wchar.h (ISO): Converting Single Characters.

int mbsinit (const mbstate_t *ps)

wchar.h (ISO): Representing the state of the conversion.

size_t mbsnrtowcs (wchar_t *restrict dst, const char **restrict src, size_t nmc, size_t len, mbstate_t *restrict ps)

wchar.h (GNU): Converting Multibyte and Wide Character Strings.

size_t mbsrtowcs (wchar_t *restrict dst, const char **restrict src, size_t len, mbstate_t *restrict ps)

wchar.h (ISO): Converting Multibyte and Wide Character Strings.

mbstate_t

wchar.h (ISO): Representing the state of the conversion.

size_t mbstowcs (wchar_t *wstring, const char *string, size_t size)

stdlib.h (ISO): Non-reentrant Conversion of Strings.

int mbtowc (wchar_t *restrict result, const char *restrict string, size_t size)

stdlib.h (ISO): Non-reentrant Conversion of Single Characters.

int mcheck (void (*abortfn) (enum mcheck_status status))

mcheck.h (GNU): Heap Consistency Checking.

tcflag_t MDMBUF

termios.h (BSD): Control Modes.

void * memalign (size_t boundary, size_t size)

malloc.h (BSD): Allocating Aligned Memory Blocks.

__memalign_hook

malloc.h (GNU): Memory Allocation Hooks.

void * memccpy (void *restrict to, const void *restrict from, int c, size_t size)

string.h (SVID): Copying and Concatenation.

void * memchr (const void *block, int c, size_t size)

string.h (ISO): Search Functions.

int memcmp (const void *a1, const void *a2, size_t size)

string.h (ISO): String/Array Comparison.

void * memcpy (void *restrict to, const void *restrict from, size_t size)

string.h (ISO): Copying and Concatenation.

void * memfrob (void *mem, size_t length)

string.h (GNU): Trivial Encryption.

void * memmem (const void *haystack, size_t haystack-len,
const void *needle, size_t needle-len)

string.h (GNU): Search Functions.

void * memmove (void *to, const void *from, size_t size)

string.h (ISO): Copying and Concatenation.

void * mempcpy (void *restrict to, const void *restrict from, size_t size)

string.h (GNU): Copying and Concatenation.

void * memrchr (const void *block, int c, size_t size)

string.h (GNU): Search Functions.

void * memset (void *block, int c, size_t size)

string.h (ISO): Copying and Concatenation.

int mkdir (const char *filename, mode_t mode)

sys/stat.h (POSIX.1): Creating Directories.

char * mkdtemp (char *template)

stdlib.h (BSD): Temporary Files.

int mkfifo (const char *filename, mode_t mode)

sys/stat.h (POSIX.1): FIFO Special Files.

int mknod (const char *filename, mode_t mode, dev_t dev)

sys/stat.h (BSD): Making Special Files.

int mkstemp (char *template)

stdlib.h (BSD): Temporary Files.

char * mktemp (char *template)

stdlib.h (Unix): Temporary Files.

time_t mktime (struct tm *brokentime)

time.h (ISO): Broken-down Time.

int mlock (const void *addr, size_t len)

sys/mman.h (POSIX.1b): Functions To Lock And Unlock Pages.

int mlockall (int flags)

sys/mman.h (POSIX.1b): Functions To Lock And Unlock Pages.

void * mmap (void *address, size_t length, int protect, int flags, int filedes, off_t offset)

sys/mman.h (POSIX): Memory-mapped I/O.

void * mmap64 (void *address, size_t length, int protect, int flags, int filedes, off64_t offset)

sys/mman.h (LFS): Memory-mapped I/O.

mode_t

sys/types.h (POSIX.1): The meaning of the File Attributes.

double modf (double value, double *integer-part)

math.h (ISO): Rounding Functions.

float modff (float value, float *integer-part)

math.h (ISO): Rounding Functions.

long double modfl (long double value, long double *integer-part)

math.h (ISO): Rounding Functions.

int mount (const char *special_file, const char *dir, const char *fstype, unsigned long int options, const void *data)

sys/mount.h (SVID, BSD): Mount, Unmount, Remount.

long int mrand48 (void)

stdlib.h (SVID): SVID Random Number Function.

int mrand48_r (struct drand48_data *buffer, long int *result)

stdlib.h (GNU): SVID Random Number Function.

void * mremap (void *address, size_t length, size_t new_length, int flag)

sys/mman.h (GNU): Memory-mapped I/O.

int MSG_DONTROUTE

sys/socket.h (BSD): Socket Data Options.

int MSG_OOB

sys/socket.h (BSD): Socket Data Options.

int MSG_PEEK

sys/socket.h (BSD): Socket Data Options.

int msync (void *address, size_t length, int flags)

sys/mman.h (POSIX): Memory-mapped I/O.

void mtrace (void)

mcheck.h (GNU): How to install the tracing functionality.

int munlock (const void *addr, size_t len)

sys/mman.h (POSIX.1b): Functions To Lock And Unlock Pages.

int munlockall (void)

sys/mman.h (POSIX.1b): Functions To Lock And Unlock Pages.

int munmap (void *addr, size_t length)

sys/mman.h (POSIX): Memory-mapped I/O.

void muntrace (void)

mcheck.h (GNU): How to install the tracing functionality.

int NAME_MAX

limits.h (POSIX.1): Limits on File System Capacity.

float NAN

math.h (GNU): Infinity and NaN.

double nan (const char *tagp)

math.h (ISO): Setting and modifying single bits of FP values.

float nanf (const char *tagp)

math.h (ISO): Setting and modifying single bits of FP values.

long double nanl (const char *tagp)

math.h (ISO): Setting and modifying single bits of FP values.

int nanosleep (const struct timespec *requested_time, struct timespec *remaining)

time.h (POSIX.1): Sleeping.

int NCCS

termios.h (POSIX.1): Terminal Mode Data Types.

double nearbyint (double x)

math.h (ISO): Rounding Functions.

float nearbyintf (float x)

math.h (ISO): Rounding Functions.

long double nearbyintl (long double x)

math.h (ISO): Rounding Functions.

NEW_TIME

utmp.h (SVID): Manipulating the User Accounting Database.

NEW_TIME

utmpx.h (XPG4.2): XPG User Accounting Database Functions.

double nextafter (double x, double y)

math.h (ISO): Setting and modifying single bits of FP values.

float nextafterf (float x, float y)

math.h (ISO): Setting and modifying single bits of FP values.

long double nextafterl (long double x, long double y)

math.h (ISO): Setting and modifying single bits of FP values.

double nexttoward (double x, long double y)

math.h (ISO): Setting and modifying single bits of FP values.

float nexttowardf (float x, long double y)

math.h (ISO): Setting and modifying single bits of FP values.

long double nexttowardl (long double x, long double y)

math.h (ISO): Setting and modifying single bits of FP values.

int nftw (const char *filename, __nftw_func_t func, int descriptors, int flag)

ftw.h (XPG4.2): Working with Directory Trees.

int nftw64 (const char *filename, __nftw64_func_t func, int descriptors, int flag)

ftw.h (Unix98): Working with Directory Trees.

__nftw64_func_t

ftw.h (GNU): Working with Directory Trees.

__nftw_func_t

ftw.h (GNU): Working with Directory Trees.

char * ngettext (const char *msgid1, const char *msgid2, unsigned long int n)

libintl.h (GNU): Additional functions for more complicated situations.

int NGROUPS_MAX

limits.h (POSIX.1): General Capacity Limits.

int nice (int increment)

unistd.h (BSD): Functions For Traditional Scheduling.

nlink_t

sys/types.h (POSIX.1): The meaning of the File Attributes.

char * nl_langinfo (nl_item item)

langinfo.h (XOPEN): Pinpoint Access to Locale Data.

NO_ADDRESS

netdb.h (BSD): Host Names.

tcflag_t NOFLSH

termios.h (POSIX.1): Local Modes.

tcflag_t NOKERNINFO

termios.h, (optional) (BSD): Local Modes.

NO_RECOVERY

netdb.h (BSD): Host Names.

long int nrand48 (unsigned short int xsubi[3])

stdlib.h (SVID): SVID Random Number Function.

int nrand48_r (unsigned short int xsubi[3], struct drand48_data *buffer, long int *result)

stdlib.h (GNU): SVID Random Number Function.

int NSIG

signal.h (BSD): Standard Signals.

uint32_t ntohl (uint32_t netlong)

netinet/in.h (BSD): Byte Order Conversion.

uint16_t ntohs (uint16_t netshort)

netinet/in.h (BSD): Byte Order Conversion.

int ntp_adjtime (struct timex *tptr)

sys/timex.h (GNU): High Accuracy Clock.

int ntp_gettime (struct ntptimeval *tptr)

sys/timex.h (GNU): High Accuracy Clock.

void * NULL

stddef.h (ISO): Null Pointer Constant.

int O_ACCMODE

fcntl.h (POSIX.1): File Access Modes.

int O_APPEND

fcntl.h (POSIX.1): I/O Operating Modes.

int O_ASYNC

fcntl.h (BSD): I/O Operating Modes.

void obstack_1grow (struct obstack *obstack-ptr, char c)

obstack.h (GNU): Growing Objects.

void obstack_1grow_fast (struct obstack *obstack-ptr, char c)

obstack.h (GNU): Extra Fast Growing Objects.

int obstack_alignment_mask (struct obstack *obstack-ptr)

obstack.h (GNU): Alignment of Data in Obstacks.

void * obstack_alloc (struct obstack *obstack-ptr, int size)

obstack.h (GNU): Allocation in an Obstack.

obstack_alloc_failed_handler

obstack.h (GNU): Preparing for Using Obstacks.

void * obstack_base (struct obstack *obstack-ptr)

obstack.h (GNU): Status of an Obstack.

void obstack_blank (struct obstack *obstack-ptr, int size)

obstack.h (GNU): Growing Objects.

void obstack_blank_fast (struct obstack *obstack-ptr, int size)

obstack.h (GNU): Extra Fast Growing Objects.

int obstack_chunk_size (struct obstack *obstack-ptr)

obstack.h (GNU): Obstack Chunks.

void * obstack_copy (struct obstack *obstack-ptr, void *address, int size)

obstack.h (GNU): Allocation in an Obstack.

void * obstack_copy0 (struct obstack *obstack-ptr, void *address, int size)

obstack.h (GNU): Allocation in an Obstack.

void * obstack_finish (struct obstack *obstack-ptr)

obstack.h (GNU): Growing Objects.

void obstack_free (struct obstack *obstack-ptr, void *object)

obstack.h (GNU): Freeing Objects in an Obstack.

void obstack_grow (struct obstack *obstack-ptr, void *data, int size)

obstack.h (GNU): Growing Objects.

void obstack_grow0 (struct obstack *obstack-ptr, void *data, int size)

obstack.h (GNU): Growing Objects.

int obstack_init (struct obstack *obstack-ptr)

obstack.h (GNU): Preparing for Using Obstacks.

void obstack_int_grow (struct obstack *obstack-ptr, int data)

obstack.h (GNU): Growing Objects.

void obstack_int_grow_fast (struct obstack *obstack-ptr, int data)

obstack.h (GNU): Extra Fast Growing Objects.

void * obstack_next_free (struct obstack *obstack-ptr)

obstack.h (GNU): Status of an Obstack.

int obstack_object_size (struct obstack *obstack-ptr)

obstack.h (GNU): Growing Objects.

int obstack_object_size (struct obstack *obstack-ptr)

obstack.h (GNU): Status of an Obstack.

int obstack_printf (struct obstack *obstack, const char *template, …)

stdio.h (GNU): Dynamically Allocating Formatted Output.

void obstack_ptr_grow (struct obstack *obstack-ptr, void *data)

obstack.h (GNU): Growing Objects.

void obstack_ptr_grow_fast (struct obstack *obstack-ptr, void *data)

obstack.h (GNU): Extra Fast Growing Objects.

int obstack_room (struct obstack *obstack-ptr)

obstack.h (GNU): Extra Fast Growing Objects.

int obstack_vprintf (struct obstack *obstack, const char *template, va_list ap)

stdio.h (GNU): Variable Arguments Output Functions.

int O_CREAT

fcntl.h (POSIX.1): Open-time Flags.

int O_EXCL

fcntl.h (POSIX.1): Open-time Flags.

int O_EXEC

fcntl.h, (optional) (GNU): File Access Modes.

int O_EXLOCK

fcntl.h, (optional) (BSD): Open-time Flags.

off64_t

sys/types.h (Unix98): Setting the File Position of a Descriptor.

size_t offsetof (type, member)

stddef.h (ISO): Structure Field Offset Measurement.

off_t

sys/types.h (POSIX.1): Setting the File Position of a Descriptor.

int O_FSYNC

fcntl.h (BSD): I/O Operating Modes.

int O_IGNORE_CTTY

fcntl.h, (optional) (GNU): Open-time Flags.

OLD_TIME

utmp.h (SVID): Manipulating the User Accounting Database.

OLD_TIME

utmpx.h (XPG4.2): XPG User Accounting Database Functions.

int O_NDELAY

fcntl.h (BSD): I/O Operating Modes.

int on_exit (void (*function)(int status, void *arg), void *arg)

stdlib.h (SunOS): Cleanups on Exit.

tcflag_t ONLCR

termios.h (POSIX.1): Output Modes.

int O_NOATIME

fcntl.h (GNU): I/O Operating Modes.

int O_NOCTTY

fcntl.h (POSIX.1): Open-time Flags.

tcflag_t ONOEOT

termios.h, (optional) (BSD): Output Modes.

int O_NOLINK

fcntl.h, (optional) (GNU): Open-time Flags.

int O_NONBLOCK

fcntl.h (POSIX.1): Open-time Flags.

int O_NONBLOCK

fcntl.h (POSIX.1): I/O Operating Modes.

int O_NOTRANS

fcntl.h, (optional) (GNU): Open-time Flags.

int open (const char *filename, int flags[, mode_t mode])

fcntl.h (POSIX.1): Opening and Closing Files.

int open64 (const char *filename, int flags[, mode_t mode])

fcntl.h (Unix98): Opening and Closing Files.

DIR * opendir (const char *dirname)

dirent.h (POSIX.1): Opening a Directory Stream.

void openlog (const char *ident, int option, int facility)

syslog.h (BSD): openlog.

int OPEN_MAX

limits.h (POSIX.1): General Capacity Limits.

FILE * open_memstream (char **ptr, size_t *sizeloc)

stdio.h (GNU): String Streams.

int openpty (int *amaster, int *aslave, char *name, const struct termios *termp, const struct winsize *winp)

pty.h (BSD): Opening a Pseudo-Terminal Pair.

tcflag_t OPOST

termios.h (POSIX.1): Output Modes.

char * optarg

unistd.h (POSIX.2): Using the getopt function.

int opterr

unistd.h (POSIX.2): Using the getopt function.

int optind

unistd.h (POSIX.2): Using the getopt function.

OPTION_ALIAS

argp.h (GNU): Flags for Argp Options.

OPTION_ARG_OPTIONAL

argp.h (GNU): Flags for Argp Options.

OPTION_DOC

argp.h (GNU): Flags for Argp Options.

OPTION_HIDDEN

argp.h (GNU): Flags for Argp Options.

OPTION_NO_USAGE

argp.h (GNU): Flags for Argp Options.

int optopt

unistd.h (POSIX.2): Using the getopt function.

int O_RDONLY

fcntl.h (POSIX.1): File Access Modes.

int O_RDWR

fcntl.h (POSIX.1): File Access Modes.

int O_READ

fcntl.h, (optional) (GNU): File Access Modes.

int O_SHLOCK

fcntl.h, (optional) (BSD): Open-time Flags.

int O_SYNC

fcntl.h (BSD): I/O Operating Modes.

int O_TRUNC

fcntl.h (POSIX.1): Open-time Flags.

int O_WRITE

fcntl.h, (optional) (GNU): File Access Modes.

int O_WRONLY

fcntl.h (POSIX.1): File Access Modes.

tcflag_t OXTABS

termios.h, (optional) (BSD): Output Modes.

PA_CHAR

printf.h (GNU): Parsing a Template String.

PA_DOUBLE

printf.h (GNU): Parsing a Template String.

PA_FLAG_LONG

printf.h (GNU): Parsing a Template String.

PA_FLAG_LONG_DOUBLE

printf.h (GNU): Parsing a Template String.

PA_FLAG_LONG_LONG

printf.h (GNU): Parsing a Template String.

int PA_FLAG_MASK

printf.h (GNU): Parsing a Template String.

PA_FLAG_PTR

printf.h (GNU): Parsing a Template String.

PA_FLAG_SHORT

printf.h (GNU): Parsing a Template String.

PA_FLOAT

printf.h (GNU): Parsing a Template String.

PA_INT

printf.h (GNU): Parsing a Template String.

PA_LAST

printf.h (GNU): Parsing a Template String.

PA_POINTER

printf.h (GNU): Parsing a Template String.

tcflag_t PARENB

termios.h (POSIX.1): Control Modes.

tcflag_t PARMRK

termios.h (POSIX.1): Input Modes.

tcflag_t PARODD

termios.h (POSIX.1): Control Modes.

size_t parse_printf_format (const char *template, size_t n, int *argtypes)

printf.h (GNU): Parsing a Template String.

PA_STRING

printf.h (GNU): Parsing a Template String.

long int pathconf (const char *filename, int parameter)

unistd.h (POSIX.1): Using pathconf.

int PATH_MAX

limits.h (POSIX.1): Limits on File System Capacity.

int pause (void)

unistd.h (POSIX.1): Using pause.

_PC_ASYNC_IO

unistd.h (POSIX.1): Using pathconf.

_PC_CHOWN_RESTRICTED

unistd.h (POSIX.1): Using pathconf.

_PC_FILESIZEBITS

unistd.h (LFS): Using pathconf.

_PC_LINK_MAX

unistd.h (POSIX.1): Using pathconf.

int pclose (FILE *stream)

stdio.h (POSIX.2, SVID, BSD): Pipe to a Subprocess.

_PC_MAX_CANON

unistd.h (POSIX.1): Using pathconf.

_PC_MAX_INPUT

unistd.h (POSIX.1): Using pathconf.

_PC_NAME_MAX

unistd.h (POSIX.1): Using pathconf.

_PC_NO_TRUNC

unistd.h (POSIX.1): Using pathconf.

_PC_PATH_MAX

unistd.h (POSIX.1): Using pathconf.

_PC_PIPE_BUF

unistd.h (POSIX.1): Using pathconf.

_PC_PRIO_IO

unistd.h (POSIX.1): Using pathconf.

_PC_REC_INCR_XFER_SIZE

unistd.h (POSIX.1): Using pathconf.

_PC_REC_MAX_XFER_SIZE

unistd.h (POSIX.1): Using pathconf.

_PC_REC_MIN_XFER_SIZE

unistd.h (POSIX.1): Using pathconf.

_PC_REC_XFER_ALIGN

unistd.h (POSIX.1): Using pathconf.

_PC_SYNC_IO

unistd.h (POSIX.1): Using pathconf.

_PC_VDISABLE

unistd.h (POSIX.1): Using pathconf.

tcflag_t PENDIN

termios.h (BSD): Local Modes.

void perror (const char *message)

stdio.h (ISO): Error Messages.

int PF_FILE

sys/socket.h (GNU): Details of Local Namespace.

int PF_INET

sys/socket.h (BSD): The Internet Namespace.

int PF_INET6

sys/socket.h (X/Open): The Internet Namespace.

int PF_LOCAL

sys/socket.h (POSIX): Details of Local Namespace.

int PF_UNIX

sys/socket.h (BSD): Details of Local Namespace.

pid_t

sys/types.h (POSIX.1): Process Identification.

int pipe (int filedes[2])

unistd.h (POSIX.1): Creating a Pipe.

int PIPE_BUF

limits.h (POSIX.1): Limits on File System Capacity.

FILE * popen (const char *command, const char *mode)

stdio.h (POSIX.2, SVID, BSD): Pipe to a Subprocess.

_POSIX2_BC_BASE_MAX

limits.h (POSIX.2): Minimum Values for Utility Limits.

_POSIX2_BC_DIM_MAX

limits.h (POSIX.2): Minimum Values for Utility Limits.

_POSIX2_BC_SCALE_MAX

limits.h (POSIX.2): Minimum Values for Utility Limits.

_POSIX2_BC_STRING_MAX

limits.h (POSIX.2): Minimum Values for Utility Limits.

int _POSIX2_C_DEV

unistd.h (POSIX.2): Overall System Options.

_POSIX2_COLL_WEIGHTS_MAX

limits.h (POSIX.2): Minimum Values for Utility Limits.

long int _POSIX2_C_VERSION

unistd.h (POSIX.2): Which Version of POSIX is Supported.

_POSIX2_EQUIV_CLASS_MAX

limits.h (POSIX.2): Minimum Values for Utility Limits.

_POSIX2_EXPR_NEST_MAX

limits.h (POSIX.2): Minimum Values for Utility Limits.

int _POSIX2_FORT_DEV

unistd.h (POSIX.2): Overall System Options.

int _POSIX2_FORT_RUN

unistd.h (POSIX.2): Overall System Options.

_POSIX2_LINE_MAX

limits.h (POSIX.2): Minimum Values for Utility Limits.

int _POSIX2_LOCALEDEF

unistd.h (POSIX.2): Overall System Options.

_POSIX2_RE_DUP_MAX

limits.h (POSIX.2): Minimum Values for General Capacity Limits.

int _POSIX2_SW_DEV

unistd.h (POSIX.2): Overall System Options.

_POSIX_AIO_LISTIO_MAX

limits.h (POSIX.1): Minimum Values for General Capacity Limits.

_POSIX_AIO_MAX

limits.h (POSIX.1): Minimum Values for General Capacity Limits.

_POSIX_ARG_MAX

limits.h (POSIX.1): Minimum Values for General Capacity Limits.

_POSIX_CHILD_MAX

limits.h (POSIX.1): Minimum Values for General Capacity Limits.

int _POSIX_CHOWN_RESTRICTED

unistd.h (POSIX.1): Optional Features in File Support.

_POSIX_C_SOURCE

(POSIX.2): Feature Test Macros.

int _POSIX_JOB_CONTROL

unistd.h (POSIX.1): Overall System Options.

_POSIX_LINK_MAX

limits.h (POSIX.1): Minimum Values for File System Limits.

_POSIX_MAX_CANON

limits.h (POSIX.1): Minimum Values for File System Limits.

_POSIX_MAX_INPUT

limits.h (POSIX.1): Minimum Values for File System Limits.

int posix_memalign (void **memptr, size_t alignment, size_t size)

stdlib.h (POSIX): Allocating Aligned Memory Blocks.

_POSIX_NAME_MAX

limits.h (POSIX.1): Minimum Values for File System Limits.

_POSIX_NGROUPS_MAX

limits.h (POSIX.1): Minimum Values for General Capacity Limits.

int _POSIX_NO_TRUNC

unistd.h (POSIX.1): Optional Features in File Support.

_POSIX_OPEN_MAX

limits.h (POSIX.1): Minimum Values for General Capacity Limits.

_POSIX_PATH_MAX

limits.h (POSIX.1): Minimum Values for File System Limits.

_POSIX_PIPE_BUF

limits.h (POSIX.1): Minimum Values for File System Limits.

POSIX_REC_INCR_XFER_SIZE

limits.h (POSIX.1): Minimum Values for File System Limits.

POSIX_REC_MAX_XFER_SIZE

limits.h (POSIX.1): Minimum Values for File System Limits.

POSIX_REC_MIN_XFER_SIZE

limits.h (POSIX.1): Minimum Values for File System Limits.

POSIX_REC_XFER_ALIGN

limits.h (POSIX.1): Minimum Values for File System Limits.

int _POSIX_SAVED_IDS

unistd.h (POSIX.1): Overall System Options.

_POSIX_SOURCE

(POSIX.1): Feature Test Macros.

_POSIX_SSIZE_MAX

limits.h (POSIX.1): Minimum Values for General Capacity Limits.

_POSIX_STREAM_MAX

limits.h (POSIX.1): Minimum Values for General Capacity Limits.

_POSIX_TZNAME_MAX

limits.h (POSIX.1): Minimum Values for General Capacity Limits.

unsigned char _POSIX_VDISABLE

unistd.h (POSIX.1): Optional Features in File Support.

long int _POSIX_VERSION

unistd.h (POSIX.1): Which Version of POSIX is Supported.

double pow (double base, double power)

math.h (ISO): Exponentiation and Logarithms.

double pow10 (double x)

math.h (GNU): Exponentiation and Logarithms.

float pow10f (float x)

math.h (GNU): Exponentiation and Logarithms.

long double pow10l (long double x)

math.h (GNU): Exponentiation and Logarithms.

float powf (float base, float power)

math.h (ISO): Exponentiation and Logarithms.

long double powl (long double base, long double power)

math.h (ISO): Exponentiation and Logarithms.

ssize_t pread (int filedes, void *buffer, size_t size, off_t offset)

unistd.h (Unix98): Input and Output Primitives.

ssize_t pread64 (int filedes, void *buffer, size_t size, off64_t offset)

unistd.h (Unix98): Input and Output Primitives.

int printf (const char *template, …)

stdio.h (ISO): Formatted Output Functions.

printf_arginfo_function

printf.h (GNU): Defining the Output Handler.

printf_function

printf.h (GNU): Defining the Output Handler.

int printf_size (FILE *fp, const struct printf_info *info, const void *const *args)

printf.h (GNU): Predefined printf Handlers.

int printf_size_info (const struct printf_info *info, size_t n, int *argtypes)

printf.h (GNU): Predefined printf Handlers.

PRIO_MAX

sys/resource.h (BSD): Functions For Traditional Scheduling.

PRIO_MIN

sys/resource.h (BSD): Functions For Traditional Scheduling.

PRIO_PGRP

sys/resource.h (BSD): Functions For Traditional Scheduling.

PRIO_PROCESS

sys/resource.h (BSD): Functions For Traditional Scheduling.

PRIO_USER

sys/resource.h (BSD): Functions For Traditional Scheduling.

char * program_invocation_name

errno.h (GNU): Error Messages.

char * program_invocation_short_name

errno.h (GNU): Error Messages.

void psignal (int signum, const char *message)

signal.h (BSD): Signal Messages.

int pthread_getattr_default_np (pthread_attr_t *attr)

pthread.h (GNU): Setting Process-wide defaults for thread attributes.

void *pthread_getspecific (pthread_key_t key)

pthread.h (POSIX): Thread-specific Data.

int pthread_key_create (pthread_key_t *key, void (*destructor)(void*))

pthread.h (POSIX): Thread-specific Data.

int pthread_key_delete (pthread_key_t key)

pthread.h (POSIX): Thread-specific Data.

int pthread_setattr_default_np (pthread_attr_t *attr)

pthread.h (GNU): Setting Process-wide defaults for thread attributes.

int pthread_setspecific (pthread_key_t key, const void *value)

pthread.h (POSIX): Thread-specific Data.

char * P_tmpdir

stdio.h (SVID): Temporary Files.

ptrdiff_t

stddef.h (ISO): Important Data Types.

char * ptsname (int filedes)

stdlib.h (SVID, XPG4.2): Allocating Pseudo-Terminals.

int ptsname_r (int filedes, char *buf, size_t len)

stdlib.h (GNU): Allocating Pseudo-Terminals.

int putc (int c, FILE *stream)

stdio.h (ISO): Simple Output by Characters or Lines.

int putchar (int c)

stdio.h (ISO): Simple Output by Characters or Lines.

int putchar_unlocked (int c)

stdio.h (POSIX): Simple Output by Characters or Lines.

int putc_unlocked (int c, FILE *stream)

stdio.h (POSIX): Simple Output by Characters or Lines.

int putenv (char *string)

stdlib.h (SVID): Environment Access.

int putpwent (const struct passwd *p, FILE *stream)

pwd.h (SVID): Writing a User Entry.

int puts (const char *s)

stdio.h (ISO): Simple Output by Characters or Lines.

struct utmp * pututline (const struct utmp *utmp)

utmp.h (SVID): Manipulating the User Accounting Database.

struct utmpx * pututxline (const struct utmpx *utmp)

utmpx.h (XPG4.2): XPG User Accounting Database Functions.

int putw (int w, FILE *stream)

stdio.h (SVID): Simple Output by Characters or Lines.

wint_t putwc (wchar_t wc, FILE *stream)

wchar.h (ISO): Simple Output by Characters or Lines.

wint_t putwchar (wchar_t wc)

wchar.h (ISO): Simple Output by Characters or Lines.

wint_t putwchar_unlocked (wchar_t wc)

wchar.h (GNU): Simple Output by Characters or Lines.

wint_t putwc_unlocked (wchar_t wc, FILE *stream)

wchar.h (GNU): Simple Output by Characters or Lines.

ssize_t pwrite (int filedes, const void *buffer, size_t size, off_t offset)

unistd.h (Unix98): Input and Output Primitives.

ssize_t pwrite64 (int filedes, const void *buffer, size_t size, off64_t offset)

unistd.h (Unix98): Input and Output Primitives.

char * qecvt (long double value, int ndigit, int *decpt, int *neg)

stdlib.h (GNU): Old-fashioned System V number-to-string functions.

int qecvt_r (long double value, int ndigit, int *decpt, int *neg, char *buf, size_t len)

stdlib.h (GNU): Old-fashioned System V number-to-string functions.

char * qfcvt (long double value, int ndigit, int *decpt, int *neg)

stdlib.h (GNU): Old-fashioned System V number-to-string functions.

int qfcvt_r (long double value, int ndigit, int *decpt, int *neg, char *buf, size_t len)

stdlib.h (GNU): Old-fashioned System V number-to-string functions.

char * qgcvt (long double value, int ndigit, char *buf)

stdlib.h (GNU): Old-fashioned System V number-to-string functions.

void qsort (void *array, size_t count, size_t size, comparison_fn_t compare)

stdlib.h (ISO): Array Sort Function.

int raise (int signum)

signal.h (ISO): Signaling Yourself.

int rand (void)

stdlib.h (ISO): ISO C Random Number Functions.

int RAND_MAX

stdlib.h (ISO): ISO C Random Number Functions.

long int random (void)

stdlib.h (BSD): BSD Random Number Functions.

int random_r (struct random_data *restrict buf, int32_t *restrict result)

stdlib.h (GNU): BSD Random Number Functions.

int rand_r (unsigned int *seed)

stdlib.h (POSIX.1): ISO C Random Number Functions.

void * rawmemchr (const void *block, int c)

string.h (GNU): Search Functions.

ssize_t read (int filedes, void *buffer, size_t size)

unistd.h (POSIX.1): Input and Output Primitives.

struct dirent * readdir (DIR *dirstream)

dirent.h (POSIX.1): Reading and Closing a Directory Stream.

struct dirent64 * readdir64 (DIR *dirstream)

dirent.h (LFS): Reading and Closing a Directory Stream.

int readdir64_r (DIR *dirstream, struct dirent64 *entry, struct dirent64 **result)

dirent.h (LFS): Reading and Closing a Directory Stream.

int readdir_r (DIR *dirstream, struct dirent *entry, struct dirent **result)

dirent.h (GNU): Reading and Closing a Directory Stream.

ssize_t readlink (const char *filename, char *buffer, size_t size)

unistd.h (BSD): Symbolic Links.

ssize_t readv (int filedes, const struct iovec *vector, int count)

sys/uio.h (BSD): Fast Scatter-Gather I/O.

void * realloc (void *ptr, size_t newsize)

malloc.h, stdlib.h (ISO): Changing the Size of a Block.

__realloc_hook

malloc.h (GNU): Memory Allocation Hooks.

char * realpath (const char *restrict name, char *restrict resolved)

stdlib.h (XPG): Symbolic Links.

ssize_t recv (int socket, void *buffer, size_t size, int flags)

sys/socket.h (BSD): Receiving Data.

ssize_t recvfrom (int socket, void *buffer, size_t size, int flags, struct sockaddr *addr, socklen_t *length-ptr)

sys/socket.h (BSD): Receiving Datagrams.

ssize_t recvmsg (int socket, struct msghdr *message, int flags)

sys/socket.h (BSD): Receiving Datagrams.

int RE_DUP_MAX

limits.h (POSIX.2): General Capacity Limits.

_REENTRANT

(GNU): Feature Test Macros.

REG_BADBR

regex.h (POSIX.2): POSIX Regular Expression Compilation.

REG_BADPAT

regex.h (POSIX.2): POSIX Regular Expression Compilation.

REG_BADRPT

regex.h (POSIX.2): POSIX Regular Expression Compilation.

int regcomp (regex_t *restrict compiled, const char *restrict pattern, int cflags)

regex.h (POSIX.2): POSIX Regular Expression Compilation.

REG_EBRACE

regex.h (POSIX.2): POSIX Regular Expression Compilation.

REG_EBRACK

regex.h (POSIX.2): POSIX Regular Expression Compilation.

REG_ECOLLATE

regex.h (POSIX.2): POSIX Regular Expression Compilation.

REG_ECTYPE

regex.h (POSIX.2): POSIX Regular Expression Compilation.

REG_EESCAPE

regex.h (POSIX.2): POSIX Regular Expression Compilation.

REG_EPAREN

regex.h (POSIX.2): POSIX Regular Expression Compilation.

REG_ERANGE

regex.h (POSIX.2): POSIX Regular Expression Compilation.

size_t regerror (int errcode, const regex_t *restrict compiled, char *restrict buffer, size_t length)

regex.h (POSIX.2): POSIX Regexp Matching Cleanup.

REG_ESPACE

regex.h (POSIX.2): Matching a Compiled POSIX Regular Expression.

REG_ESPACE

regex.h (POSIX.2): POSIX Regular Expression Compilation.

REG_ESUBREG

regex.h (POSIX.2): POSIX Regular Expression Compilation.

int regexec (const regex_t *restrict compiled, const char *restrict string, size_t nmatch, regmatch_t matchptr[restrict], int eflags)

regex.h (POSIX.2): Matching a Compiled POSIX Regular Expression.

regex_t

regex.h (POSIX.2): POSIX Regular Expression Compilation.

REG_EXTENDED

regex.h (POSIX.2): Flags for POSIX Regular Expressions.

void regfree (regex_t *compiled)

regex.h (POSIX.2): POSIX Regexp Matching Cleanup.

REG_ICASE

regex.h (POSIX.2): Flags for POSIX Regular Expressions.

int register_printf_function (int spec, printf_function handler-function, printf_arginfo_function arginfo-function)

printf.h (GNU): Registering New Conversions.

regmatch_t

regex.h (POSIX.2): Match Results with Subexpressions.

REG_NEWLINE

regex.h (POSIX.2): Flags for POSIX Regular Expressions.

REG_NOMATCH

regex.h (POSIX.2): Matching a Compiled POSIX Regular Expression.

REG_NOSUB

regex.h (POSIX.2): Flags for POSIX Regular Expressions.

REG_NOTBOL

regex.h (POSIX.2): Matching a Compiled POSIX Regular Expression.

REG_NOTEOL

regex.h (POSIX.2): Matching a Compiled POSIX Regular Expression.

regoff_t

regex.h (POSIX.2): Match Results with Subexpressions.

double remainder (double numerator, double denominator)

math.h (BSD): Remainder Functions.

float remainderf (float numerator, float denominator)

math.h (BSD): Remainder Functions.

long double remainderl (long double numerator, long double denominator)

math.h (BSD): Remainder Functions.

int remove (const char *filename)

stdio.h (ISO): Deleting Files.

int rename (const char *oldname, const char *newname)

stdio.h (ISO): Renaming Files.

void rewind (FILE *stream)

stdio.h (ISO): File Positioning.

void rewinddir (DIR *dirstream)

dirent.h (POSIX.1): Random Access in a Directory Stream.

char * rindex (const char *string, int c)

string.h (BSD): Search Functions.

double rint (double x)

math.h (ISO): Rounding Functions.

float rintf (float x)

math.h (ISO): Rounding Functions.

long double rintl (long double x)

math.h (ISO): Rounding Functions.

rlim_t RLIM_INFINITY

sys/resource.h (BSD): Limiting Resource Usage.

RLIMIT_AS

sys/resource.h (Unix98): Limiting Resource Usage.

RLIMIT_CORE

sys/resource.h (BSD): Limiting Resource Usage.

RLIMIT_CPU

sys/resource.h (BSD): Limiting Resource Usage.

RLIMIT_DATA

sys/resource.h (BSD): Limiting Resource Usage.

RLIMIT_FSIZE

sys/resource.h (BSD): Limiting Resource Usage.

RLIMIT_MEMLOCK

sys/resource.h (BSD): Limiting Resource Usage.

RLIMIT_NOFILE

sys/resource.h (BSD): Limiting Resource Usage.

RLIMIT_NPROC

sys/resource.h (BSD): Limiting Resource Usage.

RLIMIT_RSS

sys/resource.h (BSD): Limiting Resource Usage.

RLIMIT_STACK

sys/resource.h (BSD): Limiting Resource Usage.

RLIM_NLIMITS

sys/resource.h (BSD): Limiting Resource Usage.

int rmdir (const char *filename)

unistd.h (POSIX.1): Deleting Files.

int R_OK

unistd.h (POSIX.1): Testing Permission to Access a File.

double round (double x)

math.h (ISO): Rounding Functions.

float roundf (float x)

math.h (ISO): Rounding Functions.

long double roundl (long double x)

math.h (ISO): Rounding Functions.

int rpmatch (const char *response)

stdlib.h (stdlib.h): Yes-or-No Questions.

RUN_LVL

utmp.h (SVID): Manipulating the User Accounting Database.

RUN_LVL

utmpx.h (XPG4.2): XPG User Accounting Database Functions.

RUSAGE_CHILDREN

sys/resource.h (BSD): Resource Usage.

RUSAGE_SELF

sys/resource.h (BSD): Resource Usage.

int SA_NOCLDSTOP

signal.h (POSIX.1): Flags for sigaction.

int SA_ONSTACK

signal.h (BSD): Flags for sigaction.

int SA_RESTART

signal.h (BSD): Flags for sigaction.

void *sbrk (ptrdiff_t delta)

unistd.h (BSD): Resizing the Data Segment.

_SC_2_C_DEV

unistd.h (POSIX.2): Constants for sysconf Parameters.

_SC_2_FORT_DEV

unistd.h (POSIX.2): Constants for sysconf Parameters.

_SC_2_FORT_RUN

unistd.h (POSIX.2): Constants for sysconf Parameters.

_SC_2_LOCALEDEF

unistd.h (POSIX.2): Constants for sysconf Parameters.

_SC_2_SW_DEV

unistd.h (POSIX.2): Constants for sysconf Parameters.

_SC_2_VERSION

unistd.h (POSIX.2): Constants for sysconf Parameters.

_SC_AIO_LISTIO_MAX

unistd.h (POSIX.1): Constants for sysconf Parameters.

_SC_AIO_MAX

unistd.h (POSIX.1): Constants for sysconf Parameters.

_SC_AIO_PRIO_DELTA_MAX

unistd.h (POSIX.1): Constants for sysconf Parameters.

double scalb (double value, double exponent)

math.h (BSD): Normalization Functions.

float scalbf (float value, float exponent)

math.h (BSD): Normalization Functions.

long double scalbl (long double value, long double exponent)

math.h (BSD): Normalization Functions.

double scalbln (double x, long int n)

math.h (BSD): Normalization Functions.

float scalblnf (float x, long int n)

math.h (BSD): Normalization Functions.

long double scalblnl (long double x, long int n)

math.h (BSD): Normalization Functions.

double scalbn (double x, int n)

math.h (BSD): Normalization Functions.

float scalbnf (float x, int n)

math.h (BSD): Normalization Functions.

long double scalbnl (long double x, int n)

math.h (BSD): Normalization Functions.

int scandir (const char *dir, struct dirent ***namelist, int (*selector) (const struct dirent *), int (*cmp) (const struct dirent **, const struct dirent **))

dirent.h (BSD/SVID): Scanning the Content of a Directory.

int scandir64 (const char *dir, struct dirent64 ***namelist, int (*selector) (const struct dirent64 *), int (*cmp) (const struct dirent64 **, const struct dirent64 **))

dirent.h (GNU): Scanning the Content of a Directory.

int scanf (const char *template, …)

stdio.h (ISO): Formatted Input Functions.

_SC_ARG_MAX

unistd.h (POSIX.1): Constants for sysconf Parameters.

_SC_ASYNCHRONOUS_IO

unistd.h (POSIX.1): Constants for sysconf Parameters.

_SC_ATEXIT_MAX

unistd.h (GNU): Constants for sysconf Parameters.

_SC_AVPHYS_PAGES

unistd.h (GNU): Constants for sysconf Parameters.

_SC_BC_BASE_MAX

unistd.h (POSIX.2): Constants for sysconf Parameters.

_SC_BC_DIM_MAX

unistd.h (POSIX.2): Constants for sysconf Parameters.

_SC_BC_SCALE_MAX

unistd.h (POSIX.2): Constants for sysconf Parameters.

_SC_BC_STRING_MAX

unistd.h (POSIX.2): Constants for sysconf Parameters.

_SC_CHAR_BIT

unistd.h (X/Open): Constants for sysconf Parameters.

_SC_CHARCLASS_NAME_MAX

unistd.h (GNU): Constants for sysconf Parameters.

_SC_CHAR_MAX

unistd.h (X/Open): Constants for sysconf Parameters.

_SC_CHAR_MIN

unistd.h (X/Open): Constants for sysconf Parameters.

_SC_CHILD_MAX

unistd.h (POSIX.1): Constants for sysconf Parameters.

_SC_CLK_TCK

unistd.h (POSIX.1): Constants for sysconf Parameters.

_SC_COLL_WEIGHTS_MAX

unistd.h (POSIX.2): Constants for sysconf Parameters.

_SC_DELAYTIMER_MAX

unistd.h (POSIX.1): Constants for sysconf Parameters.

_SC_EQUIV_CLASS_MAX

unistd.h (POSIX.2): Constants for sysconf Parameters.

_SC_EXPR_NEST_MAX

unistd.h (POSIX.2): Constants for sysconf Parameters.

_SC_FSYNC

unistd.h (POSIX.1): Constants for sysconf Parameters.

_SC_GETGR_R_SIZE_MAX

unistd.h (POSIX.1): Constants for sysconf Parameters.

_SC_GETPW_R_SIZE_MAX

unistd.h (POSIX.1): Constants for sysconf Parameters.

SCHAR_MAX

limits.h (ISO): Range of an Integer Type.

SCHAR_MIN

limits.h (ISO): Range of an Integer Type.

int sched_getaffinity (pid_t pid, size_t cpusetsize, cpu_set_t *cpuset)

sched.h (GNU): Limiting execution to certain CPUs.

int sched_getparam (pid_t pid, struct sched_param *param)

sched.h (POSIX): Basic Scheduling Functions.

int sched_get_priority_max (int policy)

sched.h (POSIX): Basic Scheduling Functions.

int sched_get_priority_min (int policy)

sched.h (POSIX): Basic Scheduling Functions.

int sched_getscheduler (pid_t pid)

sched.h (POSIX): Basic Scheduling Functions.

int sched_rr_get_interval (pid_t pid, struct timespec *interval)

sched.h (POSIX): Basic Scheduling Functions.

int sched_setaffinity (pid_t pid, size_t cpusetsize, const cpu_set_t *cpuset)

sched.h (GNU): Limiting execution to certain CPUs.

int sched_setparam (pid_t pid, const struct sched_param *param)

sched.h (POSIX): Basic Scheduling Functions.

int sched_setscheduler (pid_t pid, int policy, const struct sched_param *param)

sched.h (POSIX): Basic Scheduling Functions.

int sched_yield (void)

sched.h (POSIX): Basic Scheduling Functions.

_SC_INT_MAX

unistd.h (X/Open): Constants for sysconf Parameters.

_SC_INT_MIN

unistd.h (X/Open): Constants for sysconf Parameters.

_SC_JOB_CONTROL

unistd.h (POSIX.1): Constants for sysconf Parameters.

_SC_LINE_MAX

unistd.h (POSIX.2): Constants for sysconf Parameters.

_SC_LOGIN_NAME_MAX

unistd.h (POSIX.1): Constants for sysconf Parameters.

_SC_LONG_BIT

unistd.h (X/Open): Constants for sysconf Parameters.

_SC_MAPPED_FILES

unistd.h (POSIX.1): Constants for sysconf Parameters.

_SC_MB_LEN_MAX

unistd.h (X/Open): Constants for sysconf Parameters.

_SC_MEMLOCK

unistd.h (POSIX.1): Constants for sysconf Parameters.

_SC_MEMLOCK_RANGE

unistd.h (POSIX.1): Constants for sysconf Parameters.

_SC_MEMORY_PROTECTION

unistd.h (POSIX.1): Constants for sysconf Parameters.

_SC_MESSAGE_PASSING

unistd.h (POSIX.1): Constants for sysconf Parameters.

_SC_MQ_OPEN_MAX

unistd.h (POSIX.1): Constants for sysconf Parameters.

_SC_MQ_PRIO_MAX

unistd.h (POSIX.1): Constants for sysconf Parameters.

_SC_NGROUPS_MAX

unistd.h (POSIX.1): Constants for sysconf Parameters.

_SC_NL_ARGMAX

unistd.h (X/Open): Constants for sysconf Parameters.

_SC_NL_LANGMAX

unistd.h (X/Open): Constants for sysconf Parameters.

_SC_NL_MSGMAX

unistd.h (X/Open): Constants for sysconf Parameters.

_SC_NL_NMAX

unistd.h (X/Open): Constants for sysconf Parameters.

_SC_NL_SETMAX

unistd.h (X/Open): Constants for sysconf Parameters.

_SC_NL_TEXTMAX

unistd.h (X/Open): Constants for sysconf Parameters.

_SC_NPROCESSORS_CONF

unistd.h (GNU): Constants for sysconf Parameters.

_SC_NPROCESSORS_ONLN

unistd.h (GNU): Constants for sysconf Parameters.

_SC_NZERO

unistd.h (X/Open): Constants for sysconf Parameters.

_SC_OPEN_MAX

unistd.h (POSIX.1): Constants for sysconf Parameters.

_SC_PAGESIZE

unistd.h (GNU): Constants for sysconf Parameters.

_SC_PHYS_PAGES

unistd.h (GNU): Constants for sysconf Parameters.

_SC_PII

unistd.h (POSIX.1g): Constants for sysconf Parameters.

_SC_PII_INTERNET

unistd.h (POSIX.1g): Constants for sysconf Parameters.

_SC_PII_INTERNET_DGRAM

unistd.h (POSIX.1g): Constants for sysconf Parameters.

_SC_PII_INTERNET_STREAM

unistd.h (POSIX.1g): Constants for sysconf Parameters.

_SC_PII_OSI

unistd.h (POSIX.1g): Constants for sysconf Parameters.

_SC_PII_OSI_CLTS

unistd.h (POSIX.1g): Constants for sysconf Parameters.

_SC_PII_OSI_COTS

unistd.h (POSIX.1g): Constants for sysconf Parameters.

_SC_PII_OSI_M

unistd.h (POSIX.1g): Constants for sysconf Parameters.

_SC_PII_SOCKET

unistd.h (POSIX.1g): Constants for sysconf Parameters.

_SC_PII_XTI

unistd.h (POSIX.1g): Constants for sysconf Parameters.

_SC_PRIORITIZED_IO

unistd.h (POSIX.1): Constants for sysconf Parameters.

_SC_PRIORITY_SCHEDULING

unistd.h (POSIX.1): Constants for sysconf Parameters.

_SC_REALTIME_SIGNALS

unistdh.h (POSIX.1): Constants for sysconf Parameters.

_SC_RTSIG_MAX

unistd.h (POSIX.1): Constants for sysconf Parameters.

_SC_SAVED_IDS

unistd.h (POSIX.1): Constants for sysconf Parameters.

_SC_SCHAR_MAX

unistd.h (X/Open): Constants for sysconf Parameters.

_SC_SCHAR_MIN

unistd.h (X/Open): Constants for sysconf Parameters.

_SC_SELECT

unistd.h (POSIX.1g): Constants for sysconf Parameters.

_SC_SEMAPHORES

unistd.h (POSIX.1): Constants for sysconf Parameters.

_SC_SEM_NSEMS_MAX

unistd.h (POSIX.1): Constants for sysconf Parameters.

_SC_SEM_VALUE_MAX

unistd.h (POSIX.1): Constants for sysconf Parameters.

_SC_SHARED_MEMORY_OBJECTS

unistd.h (POSIX.1): Constants for sysconf Parameters.

_SC_SHRT_MAX

unistd.h (X/Open): Constants for sysconf Parameters.

_SC_SHRT_MIN

unistd.h (X/Open): Constants for sysconf Parameters.

_SC_SIGQUEUE_MAX

unistd.h (POSIX.1): Constants for sysconf Parameters.

SC_SSIZE_MAX

unistd.h (X/Open): Constants for sysconf Parameters.

_SC_STREAM_MAX

unistd.h (POSIX.1): Constants for sysconf Parameters.

_SC_SYNCHRONIZED_IO

unistd.h (POSIX.1): Constants for sysconf Parameters.

_SC_THREAD_ATTR_STACKADDR

unistd.h (POSIX.1): Constants for sysconf Parameters.

_SC_THREAD_ATTR_STACKSIZE

unistd.h (POSIX.1): Constants for sysconf Parameters.

_SC_THREAD_DESTRUCTOR_ITERATIONS

unistd.h (POSIX.1): Constants for sysconf Parameters.

_SC_THREAD_KEYS_MAX

unistd.h (POSIX.1): Constants for sysconf Parameters.

_SC_THREAD_PRIO_INHERIT

unistd.h (POSIX.1): Constants for sysconf Parameters.

_SC_THREAD_PRIO_PROTECT

unistd.h (POSIX.1): Constants for sysconf Parameters.

_SC_THREAD_PRIORITY_SCHEDULING

unistd.h (POSIX.1): Constants for sysconf Parameters.

_SC_THREAD_PROCESS_SHARED

unistd.h (POSIX.1): Constants for sysconf Parameters.

_SC_THREADS

unistd.h (POSIX.1): Constants for sysconf Parameters.

_SC_THREAD_SAFE_FUNCTIONS

unistd.h (POSIX.1): Constants for sysconf Parameters.

_SC_THREAD_STACK_MIN

unistd.h (POSIX.1): Constants for sysconf Parameters.

_SC_THREAD_THREADS_MAX

unistd.h (POSIX.1): Constants for sysconf Parameters.

_SC_TIMER_MAX

unistd.h (POSIX.1): Constants for sysconf Parameters.

_SC_TIMERS

unistd.h (POSIX.1): Constants for sysconf Parameters.

_SC_T_IOV_MAX

unistd.h (POSIX.1g): Constants for sysconf Parameters.

_SC_TTY_NAME_MAX

unistd.h (POSIX.1): Constants for sysconf Parameters.

_SC_TZNAME_MAX

unistd.h (POSIX.1): Constants for sysconf Parameters.

_SC_UCHAR_MAX

unistd.h (X/Open): Constants for sysconf Parameters.

_SC_UINT_MAX

unistd.h (X/Open): Constants for sysconf Parameters.

_SC_UIO_MAXIOV

unistd.h (POSIX.1g): Constants for sysconf Parameters.

_SC_ULONG_MAX

unistd.h (X/Open): Constants for sysconf Parameters.

_SC_USHRT_MAX

unistd.h (X/Open): Constants for sysconf Parameters.

_SC_VERSION

unistd.h (POSIX.1): Constants for sysconf Parameters.

_SC_VERSION

unistd.h (POSIX.2): Constants for sysconf Parameters.

_SC_WORD_BIT

unistd.h (X/Open): Constants for sysconf Parameters.

_SC_XOPEN_CRYPT

unistd.h (X/Open): Constants for sysconf Parameters.

_SC_XOPEN_ENH_I18N

unistd.h (X/Open): Constants for sysconf Parameters.

_SC_XOPEN_LEGACY

unistd.h (X/Open): Constants for sysconf Parameters.

_SC_XOPEN_REALTIME

unistd.h (X/Open): Constants for sysconf Parameters.

_SC_XOPEN_REALTIME_THREADS

unistd.h (X/Open): Constants for sysconf Parameters.

_SC_XOPEN_SHM

unistd.h (X/Open): Constants for sysconf Parameters.

_SC_XOPEN_UNIX

unistd.h (X/Open): Constants for sysconf Parameters.

_SC_XOPEN_VERSION

unistd.h (X/Open): Constants for sysconf Parameters.

_SC_XOPEN_XCU_VERSION

unistd.h (X/Open): Constants for sysconf Parameters.

_SC_XOPEN_XPG2

unistd.h (X/Open): Constants for sysconf Parameters.

_SC_XOPEN_XPG3

unistd.h (X/Open): Constants for sysconf Parameters.

_SC_XOPEN_XPG4

unistd.h (X/Open): Constants for sysconf Parameters.

char * secure_getenv (const char *name)

stdlib.h (GNU): Environment Access.

unsigned short int * seed48 (unsigned short int seed16v[3])

stdlib.h (SVID): SVID Random Number Function.

int seed48_r (unsigned short int seed16v[3], struct drand48_data *buffer)

stdlib.h (GNU): SVID Random Number Function.

int SEEK_CUR

stdio.h (ISO): File Positioning.

void seekdir (DIR *dirstream, long int pos)

dirent.h (BSD): Random Access in a Directory Stream.

int SEEK_END

stdio.h (ISO): File Positioning.

int SEEK_SET

stdio.h (ISO): File Positioning.

int select (int nfds, fd_set *read-fds, fd_set *write-fds, fd_set *except-fds, struct timeval *timeout)

sys/types.h (BSD): Waiting for Input or Output.

ssize_t send (int socket, const void *buffer, size_t size, int flags)

sys/socket.h (BSD): Sending Data.

ssize_t sendmsg (int socket, const struct msghdr *message, int flags)

sys/socket.h (BSD): Receiving Datagrams.

ssize_t sendto (int socket, const void *buffer, size_t size, int flags, struct sockaddr *addr, socklen_t length)

sys/socket.h (BSD): Sending Datagrams.

void setbuf (FILE *stream, char *buf)

stdio.h (ISO): Controlling Which Kind of Buffering.

void setbuffer (FILE *stream, char *buf, size_t size)

stdio.h (BSD): Controlling Which Kind of Buffering.

int setcontext (const ucontext_t *ucp)

ucontext.h (SVID): Complete Context Control.

int setdomainname (const char *name, size_t length)

unistd.h (???): Host Identification.

int setegid (gid_t newgid)

unistd.h (POSIX.1): Setting the Group IDs.

int setenv (const char *name, const char *value, int replace)

stdlib.h (BSD): Environment Access.

int seteuid (uid_t neweuid)

unistd.h (POSIX.1): Setting the User ID.

int setfsent (void)

fstab.h (BSD): The fstab file.

int setgid (gid_t newgid)

unistd.h (POSIX.1): Setting the Group IDs.

void setgrent (void)

grp.h (SVID, BSD): Scanning the List of All Groups.

int setgroups (size_t count, const gid_t *groups)

grp.h (BSD): Setting the Group IDs.

void sethostent (int stayopen)

netdb.h (BSD): Host Names.

int sethostid (long int id)

unistd.h (BSD): Host Identification.

int sethostname (const char *name, size_t length)

unistd.h (BSD): Host Identification.

int setitimer (int which, const struct itimerval *new, struct itimerval *old)

sys/time.h (BSD): Setting an Alarm.

int setjmp (jmp_buf state)

setjmp.h (ISO): Details of Non-Local Exits.

void setkey (const char *key)

crypt.h (BSD, SVID): DES Encryption.

void setkey_r (const char *key, struct crypt_data * data)

crypt.h (GNU): DES Encryption.

void setlinebuf (FILE *stream)

stdio.h (BSD): Controlling Which Kind of Buffering.

char * setlocale (int category, const char *locale)

locale.h (ISO): How Programs Set the Locale.

int setlogmask (int mask)

syslog.h (BSD): setlogmask.

FILE * setmntent (const char *file, const char *mode)

mntent.h (BSD): The mtab file.

void setnetent (int stayopen)

netdb.h (BSD): Networks Database.

int setnetgrent (const char *netgroup)

netdb.h (BSD): Looking up one Netgroup.

int setpgid (pid_t pid, pid_t pgid)

unistd.h (POSIX.1): Process Group Functions.

int setpgrp (pid_t pid, pid_t pgid)

unistd.h (BSD): Process Group Functions.

int setpriority (int class, int id, int niceval)

sys/resource.h (BSD,POSIX): Functions For Traditional Scheduling.

void setprotoent (int stayopen)

netdb.h (BSD): Protocols Database.

void setpwent (void)

pwd.h (SVID, BSD): Scanning the List of All Users.

int setregid (gid_t rgid, gid_t egid)

unistd.h (BSD): Setting the Group IDs.

int setreuid (uid_t ruid, uid_t euid)

unistd.h (BSD): Setting the User ID.

int setrlimit (int resource, const struct rlimit *rlp)

sys/resource.h (BSD): Limiting Resource Usage.

int setrlimit64 (int resource, const struct rlimit64 *rlp)

sys/resource.h (Unix98): Limiting Resource Usage.

void setservent (int stayopen)

netdb.h (BSD): The Services Database.

pid_t setsid (void)

unistd.h (POSIX.1): Process Group Functions.

int setsockopt (int socket, int level, int optname, const void *optval, socklen_t optlen)

sys/socket.h (BSD): Socket Option Functions.

char * setstate (char *state)

stdlib.h (BSD): BSD Random Number Functions.

int setstate_r (char *restrict statebuf, struct random_data *restrict buf)

stdlib.h (GNU): BSD Random Number Functions.

int settimeofday (const struct timeval *tp, const struct timezone *tzp)

sys/time.h (BSD): High-Resolution Calendar.

int setuid (uid_t newuid)

unistd.h (POSIX.1): Setting the User ID.

void setutent (void)

utmp.h (SVID): Manipulating the User Accounting Database.

void setutxent (void)

utmpx.h (XPG4.2): XPG User Accounting Database Functions.

int setvbuf (FILE *stream, char *buf, int mode, size_t size)

stdio.h (ISO): Controlling Which Kind of Buffering.

int shm_open (const char *name, int oflag, mode_t mode)

sys/mman.h (POSIX): Memory-mapped I/O.

SHRT_MAX

limits.h (ISO): Range of an Integer Type.

SHRT_MIN

limits.h (ISO): Range of an Integer Type.

int shutdown (int socket, int how)

sys/socket.h (BSD): Closing a Socket.

S_IEXEC

sys/stat.h (BSD): The Mode Bits for Access Permission.

S_IFBLK

sys/stat.h (BSD): Testing the Type of a File.

S_IFCHR

sys/stat.h (BSD): Testing the Type of a File.

S_IFDIR

sys/stat.h (BSD): Testing the Type of a File.

S_IFIFO

sys/stat.h (BSD): Testing the Type of a File.

S_IFLNK

sys/stat.h (BSD): Testing the Type of a File.

int S_IFMT

sys/stat.h (BSD): Testing the Type of a File.

S_IFREG

sys/stat.h (BSD): Testing the Type of a File.

S_IFSOCK

sys/stat.h (BSD): Testing the Type of a File.

int SIGABRT

signal.h (ISO): Program Error Signals.

int sigaction (int signum, const struct sigaction *restrict action, struct sigaction *restrict old-action)

signal.h (POSIX.1): Advanced Signal Handling.

int sigaddset (sigset_t *set, int signum)

signal.h (POSIX.1): Signal Sets.

int SIGALRM

signal.h (POSIX.1): Alarm Signals.

int sigaltstack (const stack_t *restrict stack, stack_t *restrict oldstack)

signal.h (XPG): Using a Separate Signal Stack.

sig_atomic_t

signal.h (ISO): Atomic Types.

SIG_BLOCK

signal.h (POSIX.1): Process Signal Mask.

int sigblock (int mask)

signal.h (BSD): BSD Signal Handling.

int SIGBUS

signal.h (BSD): Program Error Signals.

int SIGCHLD

signal.h (POSIX.1): Job Control Signals.

int SIGCLD

signal.h (SVID): Job Control Signals.

int SIGCONT

signal.h (POSIX.1): Job Control Signals.

int sigdelset (sigset_t *set, int signum)

signal.h (POSIX.1): Signal Sets.

int sigemptyset (sigset_t *set)

signal.h (POSIX.1): Signal Sets.

int SIGEMT

signal.h (BSD): Program Error Signals.

sighandler_t SIG_ERR

signal.h (ISO): Basic Signal Handling.

int sigfillset (sigset_t *set)

signal.h (POSIX.1): Signal Sets.

int SIGFPE

signal.h (ISO): Program Error Signals.

sighandler_t

signal.h (GNU): Basic Signal Handling.

int SIGHUP

signal.h (POSIX.1): Termination Signals.

int SIGILL

signal.h (ISO): Program Error Signals.

int SIGINFO

signal.h (BSD): Miscellaneous Signals.

int SIGINT

signal.h (ISO): Termination Signals.

int siginterrupt (int signum, int failflag)

signal.h (XPG): BSD Signal Handling.

int SIGIO

signal.h (BSD): Asynchronous I/O Signals.

int SIGIOT

signal.h (Unix): Program Error Signals.

int sigismember (const sigset_t *set, int signum)

signal.h (POSIX.1): Signal Sets.

sigjmp_buf

setjmp.h (POSIX.1): Non-Local Exits and Signals.

int SIGKILL

signal.h (POSIX.1): Termination Signals.

void siglongjmp (sigjmp_buf state, int value)

setjmp.h (POSIX.1): Non-Local Exits and Signals.

int SIGLOST

signal.h (GNU): Operation Error Signals.

int sigmask (int signum)

signal.h (BSD): BSD Signal Handling.

sighandler_t signal (int signum, sighandler_t action)

signal.h (ISO): Basic Signal Handling.

int signbit (float-type x)

math.h (ISO): Setting and modifying single bits of FP values.

double significand (double x)

math.h (BSD): Normalization Functions.

float significandf (float x)

math.h (BSD): Normalization Functions.

long double significandl (long double x)

math.h (BSD): Normalization Functions.

int sigpause (int mask)

signal.h (BSD): BSD Signal Handling.

int sigpending (sigset_t *set)

signal.h (POSIX.1): Checking for Pending Signals.

int SIGPIPE

signal.h (POSIX.1): Operation Error Signals.

int SIGPOLL

signal.h (SVID): Asynchronous I/O Signals.

int sigprocmask (int how, const sigset_t *restrict set, sigset_t *restrict oldset)

signal.h (POSIX.1): Process Signal Mask.

int SIGPROF

signal.h (BSD): Alarm Signals.

int SIGQUIT

signal.h (POSIX.1): Termination Signals.

int SIGSEGV

signal.h (ISO): Program Error Signals.

int sigsetjmp (sigjmp_buf state, int savesigs)

setjmp.h (POSIX.1): Non-Local Exits and Signals.

SIG_SETMASK

signal.h (POSIX.1): Process Signal Mask.

int sigsetmask (int mask)

signal.h (BSD): BSD Signal Handling.

sigset_t

signal.h (POSIX.1): Signal Sets.

int sigstack (struct sigstack *stack, struct sigstack *oldstack)

signal.h (BSD): Using a Separate Signal Stack.

int SIGSTOP

signal.h (POSIX.1): Job Control Signals.

int sigsuspend (const sigset_t *set)

signal.h (POSIX.1): Using sigsuspend.

int SIGSYS

signal.h (Unix): Program Error Signals.

int SIGTERM

signal.h (ISO): Termination Signals.

int SIGTRAP

signal.h (BSD): Program Error Signals.

int SIGTSTP

signal.h (POSIX.1): Job Control Signals.

int SIGTTIN

signal.h (POSIX.1): Job Control Signals.

int SIGTTOU

signal.h (POSIX.1): Job Control Signals.

SIG_UNBLOCK

signal.h (POSIX.1): Process Signal Mask.

int SIGURG

signal.h (BSD): Asynchronous I/O Signals.

int SIGUSR1

signal.h (POSIX.1): Miscellaneous Signals.

int SIGUSR2

signal.h (POSIX.1): Miscellaneous Signals.

int SIGVTALRM

signal.h (BSD): Alarm Signals.

int SIGWINCH

signal.h (BSD): Miscellaneous Signals.

int SIGXCPU

signal.h (BSD): Operation Error Signals.

int SIGXFSZ

signal.h (BSD): Operation Error Signals.

double sin (double x)

math.h (ISO): Trigonometric Functions.

void sincos (double x, double *sinx, double *cosx)

math.h (GNU): Trigonometric Functions.

void sincosf (float x, float *sinx, float *cosx)

math.h (GNU): Trigonometric Functions.

void sincosl (long double x, long double *sinx, long double *cosx)

math.h (GNU): Trigonometric Functions.

float sinf (float x)

math.h (ISO): Trigonometric Functions.

double sinh (double x)

math.h (ISO): Hyperbolic Functions.

float sinhf (float x)

math.h (ISO): Hyperbolic Functions.

long double sinhl (long double x)

math.h (ISO): Hyperbolic Functions.

long double sinl (long double x)

math.h (ISO): Trigonometric Functions.

S_IREAD

sys/stat.h (BSD): The Mode Bits for Access Permission.

S_IRGRP

sys/stat.h (POSIX.1): The Mode Bits for Access Permission.

S_IROTH

sys/stat.h (POSIX.1): The Mode Bits for Access Permission.

S_IRUSR

sys/stat.h (POSIX.1): The Mode Bits for Access Permission.

S_IRWXG

sys/stat.h (POSIX.1): The Mode Bits for Access Permission.

S_IRWXO

sys/stat.h (POSIX.1): The Mode Bits for Access Permission.

S_IRWXU

sys/stat.h (POSIX.1): The Mode Bits for Access Permission.

int S_ISBLK (mode_t m)

sys/stat.h (POSIX): Testing the Type of a File.

int S_ISCHR (mode_t m)

sys/stat.h (POSIX): Testing the Type of a File.

int S_ISDIR (mode_t m)

sys/stat.h (POSIX): Testing the Type of a File.

int S_ISFIFO (mode_t m)

sys/stat.h (POSIX): Testing the Type of a File.

S_ISGID

sys/stat.h (POSIX): The Mode Bits for Access Permission.

int S_ISLNK (mode_t m)

sys/stat.h (GNU): Testing the Type of a File.

int S_ISREG (mode_t m)

sys/stat.h (POSIX): Testing the Type of a File.

int S_ISSOCK (mode_t m)

sys/stat.h (GNU): Testing the Type of a File.

S_ISUID

sys/stat.h (POSIX): The Mode Bits for Access Permission.

S_ISVTX

sys/stat.h (BSD): The Mode Bits for Access Permission.

S_IWGRP

sys/stat.h (POSIX.1): The Mode Bits for Access Permission.

S_IWOTH

sys/stat.h (POSIX.1): The Mode Bits for Access Permission.

S_IWRITE

sys/stat.h (BSD): The Mode Bits for Access Permission.

S_IWUSR

sys/stat.h (POSIX.1): The Mode Bits for Access Permission.

S_IXGRP

sys/stat.h (POSIX.1): The Mode Bits for Access Permission.

S_IXOTH

sys/stat.h (POSIX.1): The Mode Bits for Access Permission.

S_IXUSR

sys/stat.h (POSIX.1): The Mode Bits for Access Permission.

size_t

stddef.h (ISO): Important Data Types.

unsigned int sleep (unsigned int seconds)

unistd.h (POSIX.1): Sleeping.

int snprintf (char *s, size_t size, const char *template, …)

stdio.h (GNU): Formatted Output Functions.

SO_BROADCAST

sys/socket.h (BSD): Socket-Level Options.

int SOCK_DGRAM

sys/socket.h (BSD): Communication Styles.

int socket (int namespace, int style, int protocol)

sys/socket.h (BSD): Creating a Socket.

int socketpair (int namespace, int style, int protocol, int filedes[2])

sys/socket.h (BSD): Socket Pairs.

int SOCK_RAW

sys/socket.h (BSD): Communication Styles.

int SOCK_RDM

sys/socket.h (BSD): Communication Styles.

int SOCK_SEQPACKET

sys/socket.h (BSD): Communication Styles.

int SOCK_STREAM

sys/socket.h (BSD): Communication Styles.

SO_DEBUG

sys/socket.h (BSD): Socket-Level Options.

SO_DONTROUTE

sys/socket.h (BSD): Socket-Level Options.

SO_ERROR

sys/socket.h (BSD): Socket-Level Options.

SO_KEEPALIVE

sys/socket.h (BSD): Socket-Level Options.

SO_LINGER

sys/socket.h (BSD): Socket-Level Options.

int SOL_SOCKET

sys/socket.h (BSD): Socket-Level Options.

SO_OOBINLINE

sys/socket.h (BSD): Socket-Level Options.

SO_RCVBUF

sys/socket.h (BSD): Socket-Level Options.

SO_REUSEADDR

sys/socket.h (BSD): Socket-Level Options.

SO_SNDBUF

sys/socket.h (BSD): Socket-Level Options.

SO_STYLE

sys/socket.h (GNU): Socket-Level Options.

SO_TYPE

sys/socket.h (BSD): Socket-Level Options.

speed_t

termios.h (POSIX.1): Line Speed.

int sprintf (char *s, const char *template, …)

stdio.h (ISO): Formatted Output Functions.

double sqrt (double x)

math.h (ISO): Exponentiation and Logarithms.

float sqrtf (float x)

math.h (ISO): Exponentiation and Logarithms.

long double sqrtl (long double x)

math.h (ISO): Exponentiation and Logarithms.

void srand (unsigned int seed)

stdlib.h (ISO): ISO C Random Number Functions.

void srand48 (long int seedval)

stdlib.h (SVID): SVID Random Number Function.

int srand48_r (long int seedval, struct drand48_data *buffer)

stdlib.h (GNU): SVID Random Number Function.

void srandom (unsigned int seed)

stdlib.h (BSD): BSD Random Number Functions.

int srandom_r (unsigned int seed, struct random_data *buf)

stdlib.h (GNU): BSD Random Number Functions.

int sscanf (const char *s, const char *template, …)

stdio.h (ISO): Formatted Input Functions.

sighandler_t ssignal (int signum, sighandler_t action)

signal.h (SVID): Basic Signal Handling.

ssize_t SSIZE_MAX

limits.h (POSIX.1): General Capacity Limits.

ssize_t

unistd.h (POSIX.1): Input and Output Primitives.

stack_t

signal.h (XPG): Using a Separate Signal Stack.

int stat (const char *filename, struct stat *buf)

sys/stat.h (POSIX.1): Reading the Attributes of a File.

int stat64 (const char *filename, struct stat64 *buf)

sys/stat.h (Unix98): Reading the Attributes of a File.

FILE * stderr

stdio.h (ISO): Standard Streams.

STDERR_FILENO

unistd.h (POSIX.1): Descriptors and Streams.

FILE * stdin

stdio.h (ISO): Standard Streams.

STDIN_FILENO

unistd.h (POSIX.1): Descriptors and Streams.

FILE * stdout

stdio.h (ISO): Standard Streams.

STDOUT_FILENO

unistd.h (POSIX.1): Descriptors and Streams.

int stime (const time_t *newtime)

time.h (SVID, XPG): Simple Calendar Time.

char * stpcpy (char *restrict to, const char *restrict from)

string.h (Unknown origin): Copying and Concatenation.

char * stpncpy (char *restrict to, const char *restrict from, size_t size)

string.h (GNU): Copying and Concatenation.

int strcasecmp (const char *s1, const char *s2)

string.h (BSD): String/Array Comparison.

char * strcasestr (const char *haystack, const char *needle)

string.h (GNU): Search Functions.

char * strcat (char *restrict to, const char *restrict from)

string.h (ISO): Copying and Concatenation.

char * strchr (const char *string, int c)

string.h (ISO): Search Functions.

char * strchrnul (const char *string, int c)

string.h (GNU): Search Functions.

int strcmp (const char *s1, const char *s2)

string.h (ISO): String/Array Comparison.

int strcoll (const char *s1, const char *s2)

string.h (ISO): Collation Functions.

char * strcpy (char *restrict to, const char *restrict from)

string.h (ISO): Copying and Concatenation.

size_t strcspn (const char *string, const char *stopset)

string.h (ISO): Search Functions.

char * strdup (const char *s)

string.h (SVID): Copying and Concatenation.

char * strdupa (const char *s)

string.h (GNU): Copying and Concatenation.

int STREAM_MAX

limits.h (POSIX.1): General Capacity Limits.

char * strerror (int errnum)

string.h (ISO): Error Messages.

char * strerror_r (int errnum, char *buf, size_t n)

string.h (GNU): Error Messages.

char * strfry (char *string)

string.h (GNU): strfry.

size_t strftime (char *s, size_t size, const char *template, const struct tm *brokentime)

time.h (ISO): Formatting Calendar Time.

size_t strlen (const char *s)

string.h (ISO): String Length.

int strncasecmp (const char *s1, const char *s2, size_t n)

string.h (BSD): String/Array Comparison.

char * strncat (char *restrict to, const char *restrict from, size_t size)

string.h (ISO): Copying and Concatenation.

int strncmp (const char *s1, const char *s2, size_t size)

string.h (ISO): String/Array Comparison.

char * strncpy (char *restrict to, const char *restrict from, size_t size)

string.h (ISO): Copying and Concatenation.

char * strndup (const char *s, size_t size)

string.h (GNU): Copying and Concatenation.

char * strndupa (const char *s, size_t size)

string.h (GNU): Copying and Concatenation.

size_t strnlen (const char *s, size_t maxlen)

string.h (GNU): String Length.

char * strpbrk (const char *string, const char *stopset)

string.h (ISO): Search Functions.

char * strptime (const char *s, const char *fmt, struct tm *tp)

time.h (XPG4): Interpret string according to given format.

char * strrchr (const char *string, int c)

string.h (ISO): Search Functions.

char * strsep (char **string_ptr, const char *delimiter)

string.h (BSD): Finding Tokens in a String.

char * strsignal (int signum)

string.h (GNU): Signal Messages.

size_t strspn (const char *string, const char *skipset)

string.h (ISO): Search Functions.

char * strstr (const char *haystack, const char *needle)

string.h (ISO): Search Functions.

double strtod (const char *restrict string, char **restrict tailptr)

stdlib.h (ISO): Parsing of Floats.

float strtof (const char *string, char **tailptr)

stdlib.h (ISO): Parsing of Floats.

intmax_t strtoimax (const char *restrict string, char **restrict tailptr, int base)

inttypes.h (ISO): Parsing of Integers.

char * strtok (char *restrict newstring, const char *restrict delimiters)

string.h (ISO): Finding Tokens in a String.

char * strtok_r (char *newstring, const char *delimiters, char **save_ptr)

string.h (POSIX): Finding Tokens in a String.

long int strtol (const char *restrict string, char **restrict tailptr, int base)

stdlib.h (ISO): Parsing of Integers.

long double strtold (const char *string, char **tailptr)

stdlib.h (ISO): Parsing of Floats.

long long int strtoll (const char *restrict string, char **restrict tailptr, int base)

stdlib.h (ISO): Parsing of Integers.

long long int strtoq (const char *restrict string, char **restrict tailptr, int base)

stdlib.h (BSD): Parsing of Integers.

unsigned long int strtoul (const char *retrict string, char **restrict tailptr, int base)

stdlib.h (ISO): Parsing of Integers.

unsigned long long int strtoull (const char *restrict string, char **restrict tailptr, int base)

stdlib.h (ISO): Parsing of Integers.

uintmax_t strtoumax (const char *restrict string, char **restrict tailptr, int base)

inttypes.h (ISO): Parsing of Integers.

unsigned long long int strtouq (const char *restrict string, char **restrict tailptr, int base)

stdlib.h (BSD): Parsing of Integers.

struct aiocb

aio.h (POSIX.1b): Perform I/O Operations in Parallel.

struct aiocb64

aio.h (POSIX.1b): Perform I/O Operations in Parallel.

struct aioinit

aio.h (GNU): How to optimize the AIO implementation.

struct argp

argp.h (GNU): Specifying Argp Parsers.

struct argp_child

argp.h (GNU): Combining Multiple Argp Parsers.

struct argp_option

argp.h (GNU): Specifying Options in an Argp Parser.

struct argp_state

argp.h (GNU): Argp Parsing State.

struct dirent

dirent.h (POSIX.1): Format of a Directory Entry.

struct exit_status

utmp.h (SVID): Manipulating the User Accounting Database.

struct flock

fcntl.h (POSIX.1): File Locks.

struct fstab

fstab.h (BSD): The fstab file.

struct FTW

ftw.h (XPG4.2): Working with Directory Trees.

struct __gconv_step

gconv.h (GNU): The iconv Implementation in the GNU C Library.

struct __gconv_step_data

gconv.h (GNU): The iconv Implementation in the GNU C Library.

struct group

grp.h (POSIX.1): The Data Structure for a Group.

struct hostent

netdb.h (BSD): Host Names.

struct if_nameindex

net/if.h (IPv6 basic API): Interface Naming.

struct in6_addr

netinet/in.h (IPv6 basic API): Host Address Data Type.

struct in_addr

netinet/in.h (BSD): Host Address Data Type.

struct iovec

sys/uio.h (BSD): Fast Scatter-Gather I/O.

struct itimerval

sys/time.h (BSD): Setting an Alarm.

struct lconv

locale.h (ISO): localeconv: It is portable but ….

struct linger

sys/socket.h (BSD): Socket-Level Options.

struct mallinfo

malloc.h (GNU): Statistics for Memory Allocation with malloc.

struct mntent

mntent.h (BSD): The mtab file.

struct msghdr

sys/socket.h (BSD): Receiving Datagrams.

struct netent

netdb.h (BSD): Networks Database.

struct obstack

obstack.h (GNU): Creating Obstacks.

struct option

getopt.h (GNU): Parsing Long Options with getopt_long.

struct passwd

pwd.h (POSIX.1): The Data Structure that Describes a User.

struct printf_info

printf.h (GNU): Conversion Specifier Options.

struct protoent

netdb.h (BSD): Protocols Database.

struct random_data

stdlib.h (GNU): BSD Random Number Functions.

struct rlimit

sys/resource.h (BSD): Limiting Resource Usage.

struct rlimit64

sys/resource.h (Unix98): Limiting Resource Usage.

struct rusage

sys/resource.h (BSD): Resource Usage.

struct sched_param

sched.h (POSIX): Basic Scheduling Functions.

struct servent

netdb.h (BSD): The Services Database.

struct sgttyb

termios.h (BSD): BSD Terminal Modes.

struct sigaction

signal.h (POSIX.1): Advanced Signal Handling.

struct sigstack

signal.h (BSD): Using a Separate Signal Stack.

struct sockaddr

sys/socket.h (BSD): Address Formats.

struct sockaddr_in

netinet/in.h (BSD): Internet Socket Address Formats.

struct sockaddr_un

sys/un.h (BSD): Details of Local Namespace.

struct stat

sys/stat.h (POSIX.1): The meaning of the File Attributes.

struct stat64

sys/stat.h (LFS): The meaning of the File Attributes.

struct termios

termios.h (POSIX.1): Terminal Mode Data Types.

struct timespec

sys/time.h (POSIX.1): Elapsed Time.

struct timeval

sys/time.h (BSD): Elapsed Time.

struct timezone

sys/time.h (BSD): High-Resolution Calendar.

struct tm

time.h (ISO): Broken-down Time.

struct tms

sys/times.h (POSIX.1): Processor Time Inquiry.

struct utimbuf

utime.h (POSIX.1): File Times.

struct utsname

sys/utsname.h (POSIX.1): Platform Type Identification.

int strverscmp (const char *s1, const char *s2)

string.h (GNU): String/Array Comparison.

size_t strxfrm (char *restrict to, const char *restrict from, size_t size)

string.h (ISO): Collation Functions.

int stty (int filedes, const struct sgttyb *attributes)

sgtty.h (BSD): BSD Terminal Modes.

int S_TYPEISMQ (struct stat *s)

sys/stat.h (POSIX): Testing the Type of a File.

int S_TYPEISSEM (struct stat *s)

sys/stat.h (POSIX): Testing the Type of a File.

int S_TYPEISSHM (struct stat *s)

sys/stat.h (POSIX): Testing the Type of a File.

int SUN_LEN (struct sockaddr_un * ptr)

sys/un.h (BSD): Details of Local Namespace.

int swapcontext (ucontext_t *restrict oucp, const ucontext_t *restrict ucp)

ucontext.h (SVID): Complete Context Control.

int swprintf (wchar_t *s, size_t size, const wchar_t *template, …)

wchar.h (GNU): Formatted Output Functions.

int swscanf (const wchar_t *ws, const wchar_t *template, …)

wchar.h (ISO): Formatted Input Functions.

int symlink (const char *oldname, const char *newname)

unistd.h (BSD): Symbolic Links.

SYMLINK_MAX

limits.h (POSIX.1): Minimum Values for File System Limits.

void sync (void)

unistd.h (X/Open): Synchronizing I/O operations.

long int syscall (long int sysno, …)

unistd.h (???): System Calls.

long int sysconf (int parameter)

unistd.h (POSIX.1): Definition of sysconf.

int sysctl (int *names, int nlen, void *oldval, size_t *oldlenp, void *newval, size_t newlen)

sys/sysctl.h (BSD): System Parameters.

void syslog (int facility_priority, const char *format, …)

syslog.h (BSD): syslog, vsyslog.

int system (const char *command)

stdlib.h (ISO): Running a Command.

sighandler_t sysv_signal (int signum, sighandler_t action)

signal.h (GNU): Basic Signal Handling.

double tan (double x)

math.h (ISO): Trigonometric Functions.

float tanf (float x)

math.h (ISO): Trigonometric Functions.

double tanh (double x)

math.h (ISO): Hyperbolic Functions.

float tanhf (float x)

math.h (ISO): Hyperbolic Functions.

long double tanhl (long double x)

math.h (ISO): Hyperbolic Functions.

long double tanl (long double x)

math.h (ISO): Trigonometric Functions.

int tcdrain (int filedes)

termios.h (POSIX.1): Line Control Functions.

tcflag_t

termios.h (POSIX.1): Terminal Mode Data Types.

int tcflow (int filedes, int action)

termios.h (POSIX.1): Line Control Functions.

int tcflush (int filedes, int queue)

termios.h (POSIX.1): Line Control Functions.

int tcgetattr (int filedes, struct termios *termios-p)

termios.h (POSIX.1): Terminal Mode Functions.

pid_t tcgetpgrp (int filedes)

unistd.h (POSIX.1): Functions for Controlling Terminal Access.

pid_t tcgetsid (int fildes)

termios.h (Unix98): Functions for Controlling Terminal Access.

TCSADRAIN

termios.h (POSIX.1): Terminal Mode Functions.

TCSAFLUSH

termios.h (POSIX.1): Terminal Mode Functions.

TCSANOW

termios.h (POSIX.1): Terminal Mode Functions.

TCSASOFT

termios.h (BSD): Terminal Mode Functions.

int tcsendbreak (int filedes, int duration)

termios.h (POSIX.1): Line Control Functions.

int tcsetattr (int filedes, int when, const struct termios *termios-p)

termios.h (POSIX.1): Terminal Mode Functions.

int tcsetpgrp (int filedes, pid_t pgid)

unistd.h (POSIX.1): Functions for Controlling Terminal Access.

void * tdelete (const void *key, void **rootp, comparison_fn_t compar)

search.h (SVID): The tsearch function..

void tdestroy (void *vroot, __free_fn_t freefct)

search.h (GNU): The tsearch function..

long int telldir (DIR *dirstream)

dirent.h (BSD): Random Access in a Directory Stream.

TEMP_FAILURE_RETRY (expression)

unistd.h (GNU): Primitives Interrupted by Signals.

char * tempnam (const char *dir, const char *prefix)

stdio.h (SVID): Temporary Files.

char * textdomain (const char *domainname)

libintl.h (GNU): How to determine which catalog to be used.

void * tfind (const void *key, void *const *rootp, comparison_fn_t compar)

search.h (SVID): The tsearch function..

double tgamma (double x)

math.h (XPG, ISO): Special Functions.

float tgammaf (float x)

math.h (XPG, ISO): Special Functions.

long double tgammal (long double x)

math.h (XPG, ISO): Special Functions.

time_t time (time_t *result)

time.h (ISO): Simple Calendar Time.

time_t timegm (struct tm *brokentime)

time.h (???): Broken-down Time.

time_t timelocal (struct tm *brokentime)

time.h (???): Broken-down Time.

clock_t times (struct tms *buffer)

sys/times.h (POSIX.1): Processor Time Inquiry.

time_t

time.h (ISO): Simple Calendar Time.

long int timezone

time.h (SVID): Functions and Variables for Time Zones.

FILE * tmpfile (void)

stdio.h (ISO): Temporary Files.

FILE * tmpfile64 (void)

stdio.h (Unix98): Temporary Files.

int TMP_MAX

stdio.h (ISO): Temporary Files.

char * tmpnam (char *result)

stdio.h (ISO): Temporary Files.

char * tmpnam_r (char *result)

stdio.h (GNU): Temporary Files.

int toascii (int c)

ctype.h (SVID, BSD): Case Conversion.

int _tolower (int c)

ctype.h (SVID): Case Conversion.

int tolower (int c)

ctype.h (ISO): Case Conversion.

tcflag_t TOSTOP

termios.h (POSIX.1): Local Modes.

int _toupper (int c)

ctype.h (SVID): Case Conversion.

int toupper (int c)

ctype.h (ISO): Case Conversion.

wint_t towctrans (wint_t wc, wctrans_t desc)

wctype.h (ISO): Mapping of wide characters..

wint_t towlower (wint_t wc)

wctype.h (ISO): Mapping of wide characters..

wint_t towupper (wint_t wc)

wctype.h (ISO): Mapping of wide characters..

double trunc (double x)

math.h (ISO): Rounding Functions.

int truncate (const char *filename, off_t length)

unistd.h (X/Open): File Size.

int truncate64 (const char *name, off64_t length)

unistd.h (Unix98): File Size.

float truncf (float x)

math.h (ISO): Rounding Functions.

long double truncl (long double x)

math.h (ISO): Rounding Functions.

TRY_AGAIN

netdb.h (BSD): Host Names.

void * tsearch (const void *key, void **rootp, comparison_fn_t compar)

search.h (SVID): The tsearch function..

char * ttyname (int filedes)

unistd.h (POSIX.1): Identifying Terminals.

int ttyname_r (int filedes, char *buf, size_t len)

unistd.h (POSIX.1): Identifying Terminals.

void twalk (const void *root, __action_fn_t action)

search.h (SVID): The tsearch function..

char * tzname [2]

time.h (POSIX.1): Functions and Variables for Time Zones.

int TZNAME_MAX

limits.h (POSIX.1): General Capacity Limits.

void tzset (void)

time.h (POSIX.1): Functions and Variables for Time Zones.

UCHAR_MAX

limits.h (ISO): Range of an Integer Type.

ucontext_t

ucontext.h (SVID): Complete Context Control.

uid_t

sys/types.h (POSIX.1): Reading the Persona of a Process.

UINT_MAX

limits.h (ISO): Range of an Integer Type.

long int ulimit (int cmd, …)

ulimit.h (BSD): Limiting Resource Usage.

ULLONG_MAX

limits.h (ISO): Range of an Integer Type.

ULONG_LONG_MAX

limits.h (GNU): Range of an Integer Type.

ULONG_MAX

limits.h (ISO): Range of an Integer Type.

mode_t umask (mode_t mask)

sys/stat.h (POSIX.1): Assigning File Permissions.

int umount (const char *file)

sys/mount.h (SVID, GNU): Mount, Unmount, Remount.

int umount2 (const char *file, int flags)

sys/mount.h (GNU): Mount, Unmount, Remount.

int uname (struct utsname *info)

sys/utsname.h (POSIX.1): Platform Type Identification.

int ungetc (int c, FILE *stream)

stdio.h (ISO): Using ungetc To Do Unreading.

wint_t ungetwc (wint_t wc, FILE *stream)

wchar.h (ISO): Using ungetc To Do Unreading.

union wait

sys/wait.h (BSD): BSD Process Wait Functions.

int unlink (const char *filename)

unistd.h (POSIX.1): Deleting Files.

int unlockpt (int filedes)

stdlib.h (SVID, XPG4.2): Allocating Pseudo-Terminals.

int unsetenv (const char *name)

stdlib.h (BSD): Environment Access.

void updwtmp (const char *wtmp_file, const struct utmp *utmp)

utmp.h (SVID): Manipulating the User Accounting Database.

USER_PROCESS

utmp.h (SVID): Manipulating the User Accounting Database.

USER_PROCESS

utmpx.h (XPG4.2): XPG User Accounting Database Functions.

USHRT_MAX

limits.h (ISO): Range of an Integer Type.

int utime (const char *filename, const struct utimbuf *times)

utime.h (POSIX.1): File Times.

int utimes (const char *filename, const struct timeval tvp[2])

sys/time.h (BSD): File Times.

int utmpname (const char *file)

utmp.h (SVID): Manipulating the User Accounting Database.

int utmpxname (const char *file)

utmpx.h (XPG4.2): XPG User Accounting Database Functions.

type va_arg (va_list ap, type)

stdarg.h (ISO): Argument Access Macros.

void va_copy (va_list dest, va_list src)

stdarg.h (ISO): Argument Access Macros.

void va_end (va_list ap)

stdarg.h (ISO): Argument Access Macros.

va_list

stdarg.h (ISO): Argument Access Macros.

void * valloc (size_t size)

malloc.h, stdlib.h (BSD): Allocating Aligned Memory Blocks.

int vasprintf (char **ptr, const char *template, va_list ap)

stdio.h (GNU): Variable Arguments Output Functions.

void va_start (va_list ap, last-required)

stdarg.h (ISO): Argument Access Macros.

int VDISCARD

termios.h (BSD): Other Special Characters.

int VDSUSP

termios.h (BSD): Characters that Cause Signals.

int VEOF

termios.h (POSIX.1): Characters for Input Editing.

int VEOL

termios.h (POSIX.1): Characters for Input Editing.

int VEOL2

termios.h (BSD): Characters for Input Editing.

int VERASE

termios.h (POSIX.1): Characters for Input Editing.

void verr (int status, const char *format, va_list ap)

err.h (BSD): Error Messages.

void verrx (int status, const char *format, va_list ap)

err.h (BSD): Error Messages.

int versionsort (const struct dirent **a, const struct dirent **b)

dirent.h (GNU): Scanning the Content of a Directory.

int versionsort64 (const struct dirent64 **a, const struct dirent64 **b)

dirent.h (GNU): Scanning the Content of a Directory.

pid_t vfork (void)

unistd.h (BSD): Creating a Process.

int vfprintf (FILE *stream, const char *template, va_list ap)

stdio.h (ISO): Variable Arguments Output Functions.

int vfscanf (FILE *stream, const char *template, va_list ap)

stdio.h (ISO): Variable Arguments Input Functions.

int vfwprintf (FILE *stream, const wchar_t *template, va_list ap)

wchar.h (ISO): Variable Arguments Output Functions.

int vfwscanf (FILE *stream, const wchar_t *template, va_list ap)

wchar.h (ISO): Variable Arguments Input Functions.

int VINTR

termios.h (POSIX.1): Characters that Cause Signals.

int VKILL

termios.h (POSIX.1): Characters for Input Editing.

int vlimit (int resource, int limit)

sys/vlimit.h (BSD): Limiting Resource Usage.

int VLNEXT

termios.h (BSD): Other Special Characters.

int VMIN

termios.h (POSIX.1): Noncanonical Input.

void (*error_print_progname) (void)

error.h (GNU): Error Messages.

int vprintf (const char *template, va_list ap)

stdio.h (ISO): Variable Arguments Output Functions.

int VQUIT

termios.h (POSIX.1): Characters that Cause Signals.

int VREPRINT

termios.h (BSD): Characters for Input Editing.

int vscanf (const char *template, va_list ap)

stdio.h (ISO): Variable Arguments Input Functions.

int vsnprintf (char *s, size_t size, const char *template, va_list ap)

stdio.h (GNU): Variable Arguments Output Functions.

int vsprintf (char *s, const char *template, va_list ap)

stdio.h (ISO): Variable Arguments Output Functions.

int vsscanf (const char *s, const char *template, va_list ap)

stdio.h (ISO): Variable Arguments Input Functions.

int VSTART

termios.h (POSIX.1): Special Characters for Flow Control.

int VSTATUS

termios.h (BSD): Other Special Characters.

int VSTOP

termios.h (POSIX.1): Special Characters for Flow Control.

int VSUSP

termios.h (POSIX.1): Characters that Cause Signals.

int vswprintf (wchar_t *s, size_t size, const wchar_t *template, va_list ap)

wchar.h (GNU): Variable Arguments Output Functions.

int vswscanf (const wchar_t *s, const wchar_t *template, va_list ap)

wchar.h (ISO): Variable Arguments Input Functions.

void vsyslog (int facility_priority, const char *format, va_list arglist)

syslog.h (BSD): syslog, vsyslog.

int VTIME

termios.h (POSIX.1): Noncanonical Input.

int vtimes (struct vtimes *current, struct vtimes *child)

sys/vtimes.h (sys/vtimes.h): Resource Usage.

void vwarn (const char *format, va_list ap)

err.h (BSD): Error Messages.

void vwarnx (const char *format, va_list ap)

err.h (BSD): Error Messages.

int VWERASE

termios.h (BSD): Characters for Input Editing.

int vwprintf (const wchar_t *template, va_list ap)

wchar.h (ISO): Variable Arguments Output Functions.

int vwscanf (const wchar_t *template, va_list ap)

wchar.h (ISO): Variable Arguments Input Functions.

pid_t wait (int *status-ptr)

sys/wait.h (POSIX.1): Process Completion.

pid_t wait3 (union wait *status-ptr, int options, struct rusage *usage)

sys/wait.h (BSD): BSD Process Wait Functions.

pid_t wait4 (pid_t pid, int *status-ptr, int options, struct rusage *usage)

sys/wait.h (BSD): Process Completion.

pid_t waitpid (pid_t pid, int *status-ptr, int options)

sys/wait.h (POSIX.1): Process Completion.

void warn (const char *format, …)

err.h (BSD): Error Messages.

void warnx (const char *format, …)

err.h (BSD): Error Messages.

WCHAR_MAX

limits.h (GNU): Range of an Integer Type.

wint_t WCHAR_MAX

wchar.h (ISO): Introduction to Extended Characters.

wint_t WCHAR_MIN

wchar.h (ISO): Introduction to Extended Characters.

wchar_t

stddef.h (ISO): Introduction to Extended Characters.

int WCOREDUMP (int status)

sys/wait.h (BSD): Process Completion Status.

wchar_t * wcpcpy (wchar_t *restrict wto, const wchar_t *restrict wfrom)

wchar.h (GNU): Copying and Concatenation.

wchar_t * wcpncpy (wchar_t *restrict wto, const wchar_t *restrict wfrom, size_t size)

wchar.h (GNU): Copying and Concatenation.

size_t wcrtomb (char *restrict s, wchar_t wc, mbstate_t *restrict ps)

wchar.h (ISO): Converting Single Characters.

int wcscasecmp (const wchar_t *ws1, const wchar_t *ws2)

wchar.h (GNU): String/Array Comparison.

wchar_t * wcscat (wchar_t *restrict wto, const wchar_t *restrict wfrom)

wchar.h (ISO): Copying and Concatenation.

wchar_t * wcschr (const wchar_t *wstring, int wc)

wchar.h (ISO): Search Functions.

wchar_t * wcschrnul (const wchar_t *wstring, wchar_t wc)

wchar.h (GNU): Search Functions.

int wcscmp (const wchar_t *ws1, const wchar_t *ws2)

wchar.h (ISO): String/Array Comparison.

int wcscoll (const wchar_t *ws1, const wchar_t *ws2)

wchar.h (ISO): Collation Functions.

wchar_t * wcscpy (wchar_t *restrict wto, const wchar_t *restrict wfrom)

wchar.h (ISO): Copying and Concatenation.

size_t wcscspn (const wchar_t *wstring, const wchar_t *stopset)

wchar.h (ISO): Search Functions.

wchar_t * wcsdup (const wchar_t *ws)

wchar.h (GNU): Copying and Concatenation.

size_t wcsftime (wchar_t *s, size_t size, const wchar_t *template, const struct tm *brokentime)

time.h (ISO/Amend1): Formatting Calendar Time.

size_t wcslen (const wchar_t *ws)

wchar.h (ISO): String Length.

int wcsncasecmp (const wchar_t *ws1, const wchar_t *s2, size_t n)

wchar.h (GNU): String/Array Comparison.

wchar_t * wcsncat (wchar_t *restrict wto, const wchar_t *restrict wfrom, size_t size)

wchar.h (ISO): Copying and Concatenation.

int wcsncmp (const wchar_t *ws1, const wchar_t *ws2, size_t size)

wchar.h (ISO): String/Array Comparison.

wchar_t * wcsncpy (wchar_t *restrict wto, const wchar_t *restrict wfrom, size_t size)

wchar.h (ISO): Copying and Concatenation.

size_t wcsnlen (const wchar_t *ws, size_t maxlen)

wchar.h (GNU): String Length.

size_t wcsnrtombs (char *restrict dst, const wchar_t **restrict src, size_t nwc, size_t len, mbstate_t *restrict ps)

wchar.h (GNU): Converting Multibyte and Wide Character Strings.

wchar_t * wcspbrk (const wchar_t *wstring, const wchar_t *stopset)

wchar.h (ISO): Search Functions.

wchar_t * wcsrchr (const wchar_t *wstring, wchar_t c)

wchar.h (ISO): Search Functions.

size_t wcsrtombs (char *restrict dst, const wchar_t **restrict src, size_t len, mbstate_t *restrict ps)

wchar.h (ISO): Converting Multibyte and Wide Character Strings.

size_t wcsspn (const wchar_t *wstring, const wchar_t *skipset)

wchar.h (ISO): Search Functions.

wchar_t * wcsstr (const wchar_t *haystack, const wchar_t *needle)

wchar.h (ISO): Search Functions.

double wcstod (const wchar_t *restrict string, wchar_t **restrict tailptr)

wchar.h (ISO): Parsing of Floats.

float wcstof (const wchar_t *string, wchar_t **tailptr)

stdlib.h (ISO): Parsing of Floats.

intmax_t wcstoimax (const wchar_t *restrict string, wchar_t **restrict tailptr, int base)

wchar.h (ISO): Parsing of Integers.

wchar_t * wcstok (wchar_t *newstring, const wchar_t *delimiters, wchar_t **save_ptr)

wchar.h (ISO): Finding Tokens in a String.

long int wcstol (const wchar_t *restrict string, wchar_t **restrict tailptr, int base)

wchar.h (ISO): Parsing of Integers.

long double wcstold (const wchar_t *string, wchar_t **tailptr)

stdlib.h (ISO): Parsing of Floats.

long long int wcstoll (const wchar_t *restrict string, wchar_t **restrict tailptr, int base)

wchar.h (ISO): Parsing of Integers.

size_t wcstombs (char *string, const wchar_t *wstring, size_t size)

stdlib.h (ISO): Non-reentrant Conversion of Strings.

long long int wcstoq (const wchar_t *restrict string, wchar_t **restrict tailptr, int base)

wchar.h (GNU): Parsing of Integers.

unsigned long int wcstoul (const wchar_t *restrict string, wchar_t **restrict tailptr, int base)

wchar.h (ISO): Parsing of Integers.

unsigned long long int wcstoull (const wchar_t *restrict string, wchar_t **restrict tailptr, int base)

wchar.h (ISO): Parsing of Integers.

uintmax_t wcstoumax (const wchar_t *restrict string, wchar_t **restrict tailptr, int base)

wchar.h (ISO): Parsing of Integers.

unsigned long long int wcstouq (const wchar_t *restrict string, wchar_t **restrict tailptr, int base)

wchar.h (GNU): Parsing of Integers.

wchar_t * wcswcs (const wchar_t *haystack, const wchar_t *needle)

wchar.h (XPG): Search Functions.

size_t wcsxfrm (wchar_t *restrict wto, const wchar_t *wfrom, size_t size)

wchar.h (ISO): Collation Functions.

int wctob (wint_t c)

wchar.h (ISO): Converting Single Characters.

int wctomb (char *string, wchar_t wchar)

stdlib.h (ISO): Non-reentrant Conversion of Single Characters.

wctrans_t wctrans (const char *property)

wctype.h (ISO): Mapping of wide characters..

wctrans_t

wctype.h (ISO): Mapping of wide characters..

wctype_t wctype (const char *property)

wctype.h (ISO): Character class determination for wide characters.

wctype_t

wctype.h (ISO): Character class determination for wide characters.

int WEOF

wchar.h (ISO): End-Of-File and Errors.

wint_t WEOF

wchar.h (ISO): Introduction to Extended Characters.

int WEXITSTATUS (int status)

sys/wait.h (POSIX.1): Process Completion Status.

int WIFEXITED (int status)

sys/wait.h (POSIX.1): Process Completion Status.

int WIFSIGNALED (int status)

sys/wait.h (POSIX.1): Process Completion Status.

int WIFSTOPPED (int status)

sys/wait.h (POSIX.1): Process Completion Status.

wint_t

wchar.h (ISO): Introduction to Extended Characters.

wchar_t * wmemchr (const wchar_t *block, wchar_t wc, size_t size)

wchar.h (ISO): Search Functions.

int wmemcmp (const wchar_t *a1, const wchar_t *a2, size_t size)

wchar.h (ISO): String/Array Comparison.

wchar_t * wmemcpy (wchar_t *restrict wto, const wchar_t *restrict wfrom, size_t size)

wchar.h (ISO): Copying and Concatenation.

wchar_t * wmemmove (wchar_t *wto, const wchar_t *wfrom, size_t size)

wchar.h (ISO): Copying and Concatenation.

wchar_t * wmempcpy (wchar_t *restrict wto, const wchar_t *restrict wfrom, size_t size)

wchar.h (GNU): Copying and Concatenation.

wchar_t * wmemset (wchar_t *block, wchar_t wc, size_t size)

wchar.h (ISO): Copying and Concatenation.

int W_OK

unistd.h (POSIX.1): Testing Permission to Access a File.

int wordexp (const char *words, wordexp_t *word-vector-ptr, int flags)

wordexp.h (POSIX.2): Calling wordexp.

wordexp_t

wordexp.h (POSIX.2): Calling wordexp.

void wordfree (wordexp_t *word-vector-ptr)

wordexp.h (POSIX.2): Calling wordexp.

int wprintf (const wchar_t *template, …)

wchar.h (ISO): Formatted Output Functions.

WRDE_APPEND

wordexp.h (POSIX.2): Flags for Word Expansion.

WRDE_BADCHAR

wordexp.h (POSIX.2): Calling wordexp.

WRDE_BADVAL

wordexp.h (POSIX.2): Calling wordexp.

WRDE_CMDSUB

wordexp.h (POSIX.2): Calling wordexp.

WRDE_DOOFFS

wordexp.h (POSIX.2): Flags for Word Expansion.

WRDE_NOCMD

wordexp.h (POSIX.2): Flags for Word Expansion.

WRDE_NOSPACE

wordexp.h (POSIX.2): Calling wordexp.

WRDE_REUSE

wordexp.h (POSIX.2): Flags for Word Expansion.

WRDE_SHOWERR

wordexp.h (POSIX.2): Flags for Word Expansion.

WRDE_SYNTAX

wordexp.h (POSIX.2): Calling wordexp.

WRDE_UNDEF

wordexp.h (POSIX.2): Flags for Word Expansion.

ssize_t write (int filedes, const void *buffer, size_t size)

unistd.h (POSIX.1): Input and Output Primitives.

ssize_t writev (int filedes, const struct iovec *vector, int count)

sys/uio.h (BSD): Fast Scatter-Gather I/O.

int wscanf (const wchar_t *template, …)

wchar.h (ISO): Formatted Input Functions.

int WSTOPSIG (int status)

sys/wait.h (POSIX.1): Process Completion Status.

int WTERMSIG (int status)

sys/wait.h (POSIX.1): Process Completion Status.

int X_OK

unistd.h (POSIX.1): Testing Permission to Access a File.

_XOPEN_SOURCE

(X/Open): Feature Test Macros.

_XOPEN_SOURCE_EXTENDED

(X/Open): Feature Test Macros.

double y0 (double x)

math.h (SVID): Special Functions.

float y0f (float x)

math.h (SVID): Special Functions.

long double y0l (long double x)

math.h (SVID): Special Functions.

double y1 (double x)

math.h (SVID): Special Functions.

float y1f (float x)

math.h (SVID): Special Functions.

long double y1l (long double x)

math.h (SVID): Special Functions.

double yn (int n, double x)

math.h (SVID): Special Functions.

float ynf (int n, float x)

math.h (SVID): Special Functions.

long double ynl (int n, long double x)

math.h (SVID): Special Functions.