8.23 limits.h

POSIX specification:
http://www.opengroup.org/onlinepubs/9699919799/basedefs/limits.h.html

Gnulib module: gethostname

Portability problems fixed by Gnulib:

• The HOST_NAME_MAX macro is not defined on some platforms: Mac OS X 10.5, FreeBSD 6.0, NetBSD 5.0, OpenBSD 3.8, AIX 5.1, HP-UX 11, IRIX 6.5, OSF/1 5.1, Solaris 11 2011-11, Cygwin 1.5.x, mingw, MSVC 9, Interix 3.5, BeOS.

Portability problems not fixed by Gnulib:

• The macros LLONG_MIN, LLONG_MAX, ULLONG_MAX are not defined on some platforms: AIX 5.1, HP-UX 11, IRIX 6.5, OSF/1 5.1 with gcc.
• The macros WORD_BIT, LONG_BIT are not defined on some platforms: glibc 2.11 without -D_GNU_SOURCE, Cygwin, mingw, MSVC 9.
• The macro SSIZE_MAX is not defined on some platforms: MSVC 9.

For PATH_MAX, Gnulib provides a module pathmax with a header file "pathmax.h". It defines PATH_MAX to a constant on platforms with a file name length limit.