HelenOS sources

sigismember       219 uspace/lib/posix/include/posix/signal.h extern int sigismember(const sigset_t *set, int signo);
sigismember       351 uspace/lib/posix/src/signal.c 	if (sigismember(&_signal_mask, signo) ||
sigismember       394 uspace/lib/posix/src/signal.c 		if (!sigismember(&_signal_mask, item->signo) &&