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9.7 dirent.h

POSIX specification:
https://pubs.opengroup.org/onlinepubs/9699919799/basedefs/dirent.h.html

Gnulib module: dirent

Portability problems fixed by Gnulib:

• This header file is missing on some platforms: MSVC 14.
• The type ino_t is missing on some platforms: glibc 2.23 and others.

Portability problems not fixed by Gnulib:

• Although many systems define a struct dirent member named d_type and directory entry type macros like DT_DIR and DT_LNK, some do not: Minix 3.1.8, AIX 7.2, HP-UX 11, Solaris 11.4, mingw.
• On systems with d_type, not every filesystem supports d_type, and those lacking support will set it to DT_UNKNOWN.
• Some systems define a struct dirent member named d_namlen containing the string length of d_name, but others do not: glibc 2.23 on Linux, Minix 3.1.8, Solaris 11.4, Cygwin. All of these, except Cygwin, have a member d_reclen instead, that has a different semantics.
• Some systems define a struct dirent member named d_off containing a magic cookie suitable as an argument to seekdir, but others do not: glibc 2.23 on Hurd, macOS 11.1, FreeBSD 11.0, NetBSD 10.0, OpenBSD 6.7, AIX 5.1, HP-UX 11, Cygwin, mingw.
• Some systems define a struct dirent member named d_reclen containing the number of bytes in the directory entry record, but others do not. This member has limited utility, as it is an implementation detail.