105 static int	killpg1(struct thread *td, int sig, int pgid, int all,
109 static int	sigprop(int sig);
115 static struct thread *sigtd(struct proc *p, int sig, bool fast_sigblock);
261 			sig = __i * sizeof((set)->__bits[0]) * NBBY + __sig; \
284 	int old_boundary, sig;  in ast_sig()  local
329 		while ((sig = cursig(td)) != 0) {  in ast_sig()
330 			KASSERT(sig >= 0, ("sig %d", sig));  in ast_sig()
331 			postsig(sig);  in ast_sig()
772 sigprop(int sig)  in sigprop()  argument
775 	if (sig > 0 && sig < nitems(sigproptbl))  in sigprop()
776 		return (sigproptbl[sig]);  in sigprop()
801 kern_sigaction(struct thread *td, int sig, const struct sigaction *act,  in kern_sigaction()  argument
807 	if (!_SIG_VALID(sig))  in kern_sigaction()
820 		oact->sa_mask = ps->ps_catchmask[_SIG_IDX(sig)];  in kern_sigaction()
821 		if (SIGISMEMBER(ps->ps_sigonstack, sig))  in kern_sigaction()
823 		if (!SIGISMEMBER(ps->ps_sigintr, sig))  in kern_sigaction()
825 		if (SIGISMEMBER(ps->ps_sigreset, sig))  in kern_sigaction()
827 		if (SIGISMEMBER(ps->ps_signodefer, sig))  in kern_sigaction()
829 		if (SIGISMEMBER(ps->ps_siginfo, sig)) {  in kern_sigaction()
832 			    (__siginfohandler_t *)ps->ps_sigact[_SIG_IDX(sig)];  in kern_sigaction()
834 			oact->sa_handler = ps->ps_sigact[_SIG_IDX(sig)];  in kern_sigaction()
835 		if (sig == SIGCHLD && ps->ps_flag & PS_NOCLDSTOP)  in kern_sigaction()
837 		if (sig == SIGCHLD && ps->ps_flag & PS_NOCLDWAIT)  in kern_sigaction()
841 		if ((sig == SIGKILL || sig == SIGSTOP) &&  in kern_sigaction()
852 		ps->ps_catchmask[_SIG_IDX(sig)] = act->sa_mask;  in kern_sigaction()
853 		SIG_CANTMASK(ps->ps_catchmask[_SIG_IDX(sig)]);  in kern_sigaction()
855 			ps->ps_sigact[_SIG_IDX(sig)] =  in kern_sigaction()
857 			SIGADDSET(ps->ps_siginfo, sig);  in kern_sigaction()
859 			ps->ps_sigact[_SIG_IDX(sig)] = act->sa_handler;  in kern_sigaction()
860 			SIGDELSET(ps->ps_siginfo, sig);  in kern_sigaction()
863 			SIGADDSET(ps->ps_sigintr, sig);  in kern_sigaction()
865 			SIGDELSET(ps->ps_sigintr, sig);  in kern_sigaction()
867 			SIGADDSET(ps->ps_sigonstack, sig);  in kern_sigaction()
869 			SIGDELSET(ps->ps_sigonstack, sig);  in kern_sigaction()
871 			SIGADDSET(ps->ps_sigreset, sig);  in kern_sigaction()
873 			SIGDELSET(ps->ps_sigreset, sig);  in kern_sigaction()
875 			SIGADDSET(ps->ps_signodefer, sig);  in kern_sigaction()
877 			SIGDELSET(ps->ps_signodefer, sig);  in kern_sigaction()
878 		if (sig == SIGCHLD) {  in kern_sigaction()
907 		if (ps->ps_sigact[_SIG_IDX(sig)] == SIG_IGN ||  in kern_sigaction()
908 		    (sigprop(sig) & SIGPROP_IGNORE &&  in kern_sigaction()
909 		     ps->ps_sigact[_SIG_IDX(sig)] == SIG_DFL)) {  in kern_sigaction()
911 			sigqueue_delete_proc(p, sig);  in kern_sigaction()
912 			if (sig != SIGCONT)  in kern_sigaction()
914 				SIGADDSET(ps->ps_sigignore, sig);  in kern_sigaction()
915 			SIGDELSET(ps->ps_sigcatch, sig);  in kern_sigaction()
917 			SIGDELSET(ps->ps_sigignore, sig);  in kern_sigaction()
918 			if (ps->ps_sigact[_SIG_IDX(sig)] == SIG_DFL)  in kern_sigaction()
919 				SIGDELSET(ps->ps_sigcatch, sig);  in kern_sigaction()
921 				SIGADDSET(ps->ps_sigcatch, sig);  in kern_sigaction()
924 		if (ps->ps_sigact[_SIG_IDX(sig)] == SIG_IGN ||  in kern_sigaction()
925 		    ps->ps_sigact[_SIG_IDX(sig)] == SIG_DFL ||  in kern_sigaction()
927 			SIGDELSET(ps->ps_freebsd4, sig);  in kern_sigaction()
929 			SIGADDSET(ps->ps_freebsd4, sig);  in kern_sigaction()
932 		if (ps->ps_sigact[_SIG_IDX(sig)] == SIG_IGN ||  in kern_sigaction()
933 		    ps->ps_sigact[_SIG_IDX(sig)] == SIG_DFL ||  in kern_sigaction()
935 			SIGDELSET(ps->ps_osigset, sig);  in kern_sigaction()
937 			SIGADDSET(ps->ps_osigset, sig);  in kern_sigaction()
947 	int	sig;  member
966 	error = kern_sigaction(td, uap->sig, actp, oactp, 0);  in sys_sigaction()
975 	int	sig;  member
994 	error = kern_sigaction(td, uap->sig, actp, oactp, KSA_FREEBSD4);  in freebsd4_sigaction()
1078 sigdflt(struct sigacts *ps, int sig)  in sigdflt()  argument
1082 	SIGDELSET(ps->ps_sigcatch, sig);  in sigdflt()
1083 	if ((sigprop(sig) & SIGPROP_IGNORE) != 0 && sig != SIGCONT)  in sigdflt()
1084 		SIGADDSET(ps->ps_sigignore, sig);  in sigdflt()
1085 	ps->ps_sigact[_SIG_IDX(sig)] = SIG_DFL;  in sigdflt()
1086 	SIGDELSET(ps->ps_siginfo, sig);  in sigdflt()
1275 	error = copyout(&ksi.ksi_signo, uap->sig, sizeof(ksi.ksi_signo));  in sys_sigwait()
1357 	int error, sig, timevalid = 0;  in kern_sigtimedwait()  local
1400 		sig = cursig(td);  in kern_sigtimedwait()
1402 		KASSERT(sig >= 0, ("sig %d", sig));  in kern_sigtimedwait()
1403 		if (sig != 0 && SIGISMEMBER(waitset, sig)) {  in kern_sigtimedwait()
1404 			if (sigqueue_get(&td->td_sigqueue, sig, ksi) != 0 ||  in kern_sigtimedwait()
1405 			    sigqueue_get(&p->p_sigqueue, sig, ksi) != 0) {  in kern_sigtimedwait()
1460 		SDT_PROBE2(proc, , , signal__clear, sig, ksi);  in kern_sigtimedwait()
1470 			action = ps->ps_sigact[_SIG_IDX(sig)];  in kern_sigtimedwait()
1472 			ktrpsig(sig, action, &td->td_sigmask, ksi->ksi_code);  in kern_sigtimedwait()
1475 		if (sig == SIGKILL) {  in kern_sigtimedwait()
1477 			sigexit(td, sig);  in kern_sigtimedwait()
1627 	int has_sig, sig;  in kern_sigsuspend()  local
1658 		while ((sig = cursig(td)) != 0) {  in kern_sigsuspend()
1659 			KASSERT(sig >= 0, ("sig %d", sig));  in kern_sigsuspend()
1660 			has_sig += postsig(sig);  in kern_sigsuspend()
1795 	int sig;  member
1806 	err = p_cansignal(arg->td, p, arg->sig);  in killpg1_sendsig_locked()
1807 	if (err == 0 && arg->sig != 0)  in killpg1_sendsig_locked()
1808 		pksignal(p, arg->sig, arg->ksi);  in killpg1_sendsig_locked()
1847 killpg1(struct thread *td, int sig, int pgid, int all, ksiginfo_t *ksi)  in killpg1()  argument
1855 	arg.sig = sig;  in killpg1()
2083 pgsignal(struct pgrp *pgrp, int sig, int checkctty, ksiginfo_t *ksi)  in pgsignal()  argument
2093 				pksignal(p, sig, ksi);  in pgsignal()
2106 postsig_done(int sig, struct thread *td, struct sigacts *ps)  in postsig_done()  argument
2112 	mask = ps->ps_catchmask[_SIG_IDX(sig)];  in postsig_done()
2113 	if (!SIGISMEMBER(ps->ps_signodefer, sig))  in postsig_done()
2114 		SIGADDSET(mask, sig);  in postsig_done()
2117 	if (SIGISMEMBER(ps->ps_sigreset, sig))  in postsig_done()
2118 		sigdflt(ps, sig);  in postsig_done()
2132 	int sig;  in trapsignal()  local
2135 	sig = ksi->ksi_signo;  in trapsignal()
2136 	KASSERT(_SIG_VALID(sig), ("invalid signal"));  in trapsignal()
2145 	if ((p->p_flag & P_TRACED) == 0 && SIGISMEMBER(ps->ps_sigcatch, sig) &&  in trapsignal()
2146 	    !SIGISMEMBER(sigmask, sig)) {  in trapsignal()
2149 			ktrpsig(sig, ps->ps_sigact[_SIG_IDX(sig)],  in trapsignal()
2152 		(*p->p_sysent->sv_sendsig)(ps->ps_sigact[_SIG_IDX(sig)],  in trapsignal()
2154 		postsig_done(sig, td, ps);  in trapsignal()
2162 		if (kern_forcesigexit && (SIGISMEMBER(sigmask, sig) ||  in trapsignal()
2163 		    ps->ps_sigact[_SIG_IDX(sig)] == SIG_IGN)) {  in trapsignal()
2164 			SIGDELSET(td->td_sigmask, sig);  in trapsignal()
2165 			SIGDELSET(ps->ps_sigcatch, sig);  in trapsignal()
2166 			SIGDELSET(ps->ps_sigignore, sig);  in trapsignal()
2167 			ps->ps_sigact[_SIG_IDX(sig)] = SIG_DFL;  in trapsignal()
2172 		p->p_sig = sig;		/* XXX to verify code */  in trapsignal()
2173 		tdsendsignal(p, td, sig, ksi);  in trapsignal()
2179 sigtd(struct proc *p, int sig, bool fast_sigblock)  in sigtd()  argument
2190 	if (curproc == p && !SIGISMEMBER(curthread->td_sigmask, sig) &&  in sigtd()
2197 		if (!SIGISMEMBER(td->td_sigmask, sig) && (!fast_sigblock ||  in sigtd()
2228 kern_psignal(struct proc *p, int sig)  in kern_psignal()  argument
2233 	ksi.ksi_signo = sig;  in kern_psignal()
2235 	(void) tdsendsignal(p, NULL, sig, &ksi);  in kern_psignal()
2239 pksignal(struct proc *p, int sig, ksiginfo_t *ksi)  in pksignal()  argument
2242 	return (tdsendsignal(p, NULL, sig, ksi));  in pksignal()
2264 tdsignal(struct thread *td, int sig)  in tdsignal()  argument
2269 	ksi.ksi_signo = sig;  in tdsignal()
2271 	(void) tdsendsignal(td->td_proc, td, sig, &ksi);  in tdsignal()
2275 tdksignal(struct thread *td, int sig, ksiginfo_t *ksi)  in tdksignal()  argument
2278 	(void) tdsendsignal(td->td_proc, td, sig, ksi);  in tdksignal()
2293 tdsendsignal(struct proc *p, struct thread *td, int sig, ksiginfo_t *ksi)  in tdsendsignal()  argument
2303 	if (!_SIG_VALID(sig))  in tdsendsignal()
2304 		panic("%s(): invalid signal %d", __func__, sig);  in tdsendsignal()
2318 	KNOTE_LOCKED(p->p_klist, NOTE_SIGNAL | sig);  in tdsendsignal()
2319 	prop = sigprop(sig);  in tdsendsignal()
2322 		td = sigtd(p, sig, false);  in tdsendsignal()
2327 	SDT_PROBE3(proc, , , signal__send, td, p, sig);  in tdsendsignal()
2336 	if (SIGISMEMBER(ps->ps_sigignore, sig)) {  in tdsendsignal()
2339 			SDT_PROBE3(proc, , , signal__discard, td, p, sig);  in tdsendsignal()
2350 		if (SIGISMEMBER(td->td_sigmask, sig))  in tdsendsignal()
2352 		else if (SIGISMEMBER(ps->ps_sigcatch, sig))  in tdsendsignal()
2356 		if (SIGISMEMBER(ps->ps_sigintr, sig))  in tdsendsignal()
2388 	ret = sigqueue_add(sigqueue, sig, ksi);  in tdsendsignal()
2411 		if (sig == SIGKILL) {  in tdsendsignal()
2458 				sigqueue_delete(sigqueue, sig);  in tdsendsignal()
2490 			sigqueue_delete(sigqueue, sig);  in tdsendsignal()
2516 			tdsigwakeup(td, sig, action, intrval);  in tdsendsignal()
2526 			p->p_xsig = sig;  in tdsendsignal()
2546 		sigqueue_delete(sigqueue, sig);  in tdsendsignal()
2555 	tdsigwakeup(td, sig, action, intrval);  in tdsendsignal()
2572 tdsigwakeup(struct thread *td, int sig, sig_t action, int intrval)  in tdsigwakeup()  argument
2578 	prop = sigprop(sig);  in tdsigwakeup()
2608 			sigqueue_delete(&p->p_sigqueue, sig);  in tdsigwakeup()
2613 			sigqueue_delete(&td->td_sigqueue, sig);  in tdsigwakeup()
2831 ptracestop(struct thread *td, int sig, ksiginfo_t *si)  in ptracestop()  argument
2842 	td->td_xsig = sig;  in ptracestop()
2846 		CTR4(KTR_PTRACE, "ptracestop: tid %d (pid %d) flags %#x sig %d",  in ptracestop()
2847 		    td->td_tid, p->p_pid, td->td_dbgflags, sig);  in ptracestop()
2886 				p->p_xsig = sig;  in ptracestop()
2932 	if (si != NULL && sig == td->td_xsig) {  in ptracestop()
2935 		if (sigqueue_add(&td->td_sigqueue, sig, si) != 0)  in ptracestop()
2959 	int sig;  in reschedule_signals()  local
2970 	SIG_FOREACH(sig, &block) {  in reschedule_signals()
2971 		td = sigtd(p, sig, fastblk);  in reschedule_signals()
2985 		    (SIGISMEMBER(ps->ps_sigcatch, sig) &&  in reschedule_signals()
2986 		    !SIGISMEMBER(td->td_sigmask, sig))) {  in reschedule_signals()
2987 			tdsigwakeup(td, sig, SIG_CATCH,  in reschedule_signals()
2988 			    (SIGISMEMBER(ps->ps_sigintr, sig) ? EINTR :  in reschedule_signals()
3110  * The thread has signal "sig" pending.  Figure out what to do with it:
3120 sigprocess(struct thread *td, int sig)  in sigprocess()  argument
3128 	KASSERT(_SIG_VALID(sig), ("%s: invalid signal %d", __func__, sig));  in sigprocess()
3140 	if (SIGISMEMBER(ps->ps_sigignore, sig) &&  in sigprocess()
3165 		if (sigqueue_get(queue, sig, &ksi) == 0) {  in sigprocess()
3167 			sigqueue_get(queue, sig, &ksi);  in sigprocess()
3172 		sig = ptracestop(td, sig, &ksi);  in sigprocess()
3181 		if (sig == 0)  in sigprocess()
3187 		if (SIGISMEMBER(td->td_sigmask, sig)) {  in sigprocess()
3189 			sigqueue_add(&p->p_sigqueue, sig, &ksi);  in sigprocess()
3201 				sigqueue_add(queue, sig, &ksi);  in sigprocess()
3212 	switch ((intptr_t)p->p_sigacts->ps_sigact[_SIG_IDX(sig)]) {  in sigprocess()
3224 				(u_long)p->p_pid, sig);  in sigprocess()
3236 		prop = sigprop(sig);  in sigprocess()
3254 			sigqueue_delete(&td->td_sigqueue, sig);  in sigprocess()
3255 			sigqueue_delete(&p->p_sigqueue, sig);  in sigprocess()
3257 			p->p_xsig = sig;  in sigprocess()
3298  *	while (sig = cursig(curthread))
3299  *		postsig(sig);
3306 	int sig;  in issignal()  local
3353 		SIG_FOREACH(sig, &sigpending) {  in issignal()
3354 			switch (sigprocess(td, sig)) {  in issignal()
3356 				return (sig);  in issignal()
3360 				sigqueue_delete(&td->td_sigqueue, sig);  in issignal()
3361 				sigqueue_delete(&p->p_sigqueue, sig);  in issignal()
3397 postsig(int sig)  in postsig()  argument
3406 	KASSERT(sig != 0, ("postsig"));  in postsig()
3414 	if (sigqueue_get(&td->td_sigqueue, sig, &ksi) == 0 &&  in postsig()
3415 	    sigqueue_get(&p->p_sigqueue, sig, &ksi) == 0)  in postsig()
3417 	ksi.ksi_signo = sig;  in postsig()
3420 	action = ps->ps_sigact[_SIG_IDX(sig)];  in postsig()
3423 		ktrpsig(sig, action, td->td_pflags & TDP_OLDMASK ?  in postsig()
3434 		sigexit(td, sig);  in postsig()
3441 		KASSERT(!SIGISMEMBER(td->td_sigmask, sig),  in postsig()
3442 		    ("postsig action: blocked sig %d", sig));  in postsig()
3459 		if (p->p_sig == sig) {  in postsig()
3463 		postsig_done(sig, td, ps);  in postsig()
3490 	int ret, sig;  in sig_ast_needsigchk()  local
3500 	sig = cursig(td);  in sig_ast_needsigchk()
3501 	if (sig == -1) {  in sig_ast_needsigchk()
3510 	} else if (sig != 0) {  in sig_ast_needsigchk()
3511 		ret = SIGISMEMBER(ps->ps_sigintr, sig) ? EINTR : ERESTART;  in sig_ast_needsigchk()
3612 sigexit(struct thread *td, int sig)  in sigexit()  argument
3637 	if ((sigprop(sig) & SIGPROP_CORE) &&  in sigexit()
3639 		p->p_sig = sig;  in sigexit()
3650 			sig |= WCOREFLAG;  in sigexit()
3672 			    sig &~ WCOREFLAG, coreinfo);  in sigexit()
3675 	exit1(td, 0, sig);  in sigexit()
3702 childproc_jobstate(struct proc *p, int reason, int sig)  in childproc_jobstate()  argument
3722 		sigparent(p, reason, sig);  in childproc_jobstate()
4265 pgsigio(struct sigio **sigiop, int sig, int checkctty)  in pgsigio()  argument
4271 	ksi.ksi_signo = sig;  in pgsigio()
4283 			kern_psignal(sigio->sio_proc, sig);  in pgsigio()
4294 				kern_psignal(p, sig);  in pgsigio()
4389 	int sig;  in sig_drop_caught()  local
4395 	SIG_FOREACH(sig, &ps->ps_sigcatch) {  in sig_drop_caught()
4396 		sigdflt(ps, sig);  in sig_drop_caught()
4397 		if ((sigprop(sig) & SIGPROP_IGNORE) != 0)  in sig_drop_caught()
4398 			sigqueue_delete_proc(p, sig);  in sig_drop_caught()