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9.86 unistd.h

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

Gnulib module: unistd

Portability problems fixed by Gnulib:

• This header file is missing on some platforms: MSVC 14.
• The type off64_t is not defined on some platforms: macOS 14, FreeBSD 10.4, NetBSD 10.0, OpenBSD 7.5, MSVC 14, Cygwin, Haiku, Minix 3.3.
• The SEEK_* macros are not defined in this file on some platforms: mingw.
• The *_FILENO macros are not defined in this file on some platforms: OS/2 EMX, mingw.
• The _exit function is not declared in this file on some platforms: mingw.
• Some platforms provide a NULL macro that cannot be used in arbitrary expressions: NetBSD 5.0

Portability problems not fixed by Gnulib: