@node FD_ISSET
@section @code{FD_ISSET}
@findex FD_ISSET

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

Gnulib module: ---

Portability problems fixed by Gnulib:
@itemize
@end itemize

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