gethostname
===========

POSIX specification: http://www.opengroup.org/onlinepubs/9699919799/functions/gethostname.html

Gnulib module: gethostname

Portability problems fixed by Gnulib:

  * On mingw, this function has a prototype that differs from that specified by POSIX, and it is defined only in the ws2_32 library.

Portability problems not fixed by Gnulib:

  * If the given buffer is too small for the host name, some implementations fail with EINVAL, instead of returning a truncated host name.