sys/kern/kern_sig.c

561  * action, the process stops in issignal().
1301 			sig_t action;
1304 			action = ps->ps_sigact[_SIG_IDX(sig)];
1306 			ktrpsig(sig, action, &td->td_sigmask, ksi->ksi_code);
2003  * Send the signal to the process.  If the signal has an action, the action
2009  *     default action, the process is stopped without awakening it.
2011  *     regardless of the signal action (eg, blocked or ignored).
2076 	sig_t action;
2118 	 * action will be SIG_DFL here.)
2130 		action = SIG_HOLD;
2132 		action = SIG_CATCH;
2134 		action = SIG_DFL;
2146 		 * process group, discard the signal here if the action
2152 		    (action == SIG_DFL)) {
2174 	if (action == SIG_HOLD &&
2201 			 * then no further action is necessary.
2217 			 * then no further action is necessary.
2224 			 * it has no further action.  If SIGCONT is held, we
2242 			if (action == SIG_DFL) {
2248 			if (action == SIG_CATCH) {
2267 			 * then no further action is necessary.
2304 		if (p->p_flag & P_TRACED || action == SIG_CATCH) {
2305 			tdsigwakeup(td, sig, action, intrval);
2309 		MPASS(action == SIG_DFL);
2344 	tdsigwakeup(td, sig, action, intrval);
2360 tdsigwakeup(struct thread *td, int sig, sig_t action, int intrval)
2378 	if (action == SIG_DFL && (prop & SA_KILL) != 0 &&
2395 		if ((prop & SA_CONT) && action == SIG_DFL) {
2621  * Stop signals with default action are processed immediately, then cleared;
2756 			 * with default action, stop here,
2780 				 * Default action is to ignore; drop it.
2790 			 * to take action on an ignored signal other
2800 			 * This signal has an action, let
2833  * Take the action for the specified signal
2843 	sig_t action;
2859 	action = ps->ps_sigact[_SIG_IDX(sig)];
2862 		ktrpsig(sig, action, td->td_pflags & TDP_OLDMASK ?
2871 	if (action == SIG_DFL) {
2873 		 * Default action, where the default is to kill
2883 		KASSERT(action != SIG_IGN && !SIGISMEMBER(td->td_sigmask, sig),
2884 		    ("postsig action"));
2904 		(*p->p_sysent->sv_sendsig)(action, &ksi, &returnmask);