5 POSIX specification: @url{http://www.opengroup.org/onlinepubs/9699919799/functions/close.html}
9 Portability problems fixed by Gnulib:
12 On Windows platforms (excluding Cygwin), @code{socket} and @code{accept}
13 do not return file descriptors that can be closed by @code{close}.
14 Instead, @code{closesocket} must be used.
17 Portability problems not fixed by Gnulib:
20 On BeOS, @code{socket} and @code{accept} do not return file descriptors
21 that can be closed by @code{close}. Instead, @code{closesocket} must be