@node FD_SET
@section @code{FD_SET}
@findex FD_SET

POSIX specification:@* @url{https://pubs.opengroup.org/onlinepubs/9699919799/functions/FD_SET.html}

Gnulib module: ---

Portability problems fixed by Gnulib:
@itemize
@end itemize

Portability problems not fixed by Gnulib:
@itemize
@end itemize