2 * Copyright (c) 1982, 1986, 1989, 1991, 1993
3 * The Regents of the University of California. All rights reserved.
4 * (c) UNIX System Laboratories, Inc.
5 * All or some portions of this file are derived from material licensed
6 * to the University of California by American Telephone and Telegraph
7 * Co. or Unix System Laboratories, Inc. and are reproduced herein with
8 * the permission of UNIX System Laboratories, Inc.
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11 * modification, are permitted provided that the following conditions
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
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19 * may be used to endorse or promote products derived from this software
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34 * @(#)kern_sig.c 8.7 (Berkeley) 4/18/94
37 #include <sys/cdefs.h>
38 __FBSDID("$FreeBSD$");
40 #include "opt_compat.h"
41 #include "opt_ktrace.h"
43 #include <sys/param.h>
44 #include <sys/systm.h>
45 #include <sys/signalvar.h>
46 #include <sys/vnode.h>
48 #include <sys/condvar.h>
49 #include <sys/event.h>
50 #include <sys/fcntl.h>
51 #include <sys/kernel.h>
54 #include <sys/ktrace.h>
56 #include <sys/malloc.h>
57 #include <sys/mutex.h>
58 #include <sys/namei.h>
60 #include <sys/pioctl.h>
61 #include <sys/resourcevar.h>
62 #include <sys/sched.h>
63 #include <sys/sleepqueue.h>
67 #include <sys/syscallsubr.h>
68 #include <sys/sysctl.h>
69 #include <sys/sysent.h>
70 #include <sys/syslog.h>
71 #include <sys/sysproto.h>
72 #include <sys/timers.h>
73 #include <sys/unistd.h>
76 #include <vm/vm_extern.h>
79 #include <posix4/posix4.h>
80 #include <machine/cpu.h>
82 #include <security/audit/audit.h>
84 #if defined (__alpha__) && !defined(COMPAT_43)
85 #error "You *really* need COMPAT_43 on the alpha for longjmp(3)"
88 #define ONSIG 32 /* NSIG for osig* syscalls. XXX. */
90 static int coredump(struct thread *);
91 static char *expand_name(const char *, uid_t, pid_t);
92 static int killpg1(struct thread *td, int sig, int pgid, int all);
93 static int issignal(struct thread *p);
94 static int sigprop(int sig);
95 static void tdsigwakeup(struct thread *, int, sig_t, int);
96 static void sig_suspend_threads(struct thread *, struct proc *, int);
97 static int filt_sigattach(struct knote *kn);
98 static void filt_sigdetach(struct knote *kn);
99 static int filt_signal(struct knote *kn, long hint);
100 static struct thread *sigtd(struct proc *p, int sig, int prop);
101 static int kern_sigtimedwait(struct thread *, sigset_t,
102 ksiginfo_t *, struct timespec *);
103 static int do_tdsignal(struct proc *, struct thread *, int, ksiginfo_t *);
104 static void sigqueue_start(void);
106 static uma_zone_t ksiginfo_zone = NULL;
107 struct filterops sig_filtops =
108 { 0, filt_sigattach, filt_sigdetach, filt_signal };
110 static int kern_logsigexit = 1;
111 SYSCTL_INT(_kern, KERN_LOGSIGEXIT, logsigexit, CTLFLAG_RW,
113 "Log processes quitting on abnormal signals to syslog(3)");
115 static int kern_forcesigexit = 1;
116 SYSCTL_INT(_kern, OID_AUTO, forcesigexit, CTLFLAG_RW,
117 &kern_forcesigexit, 0, "Force trap signal to be handled");
119 SYSCTL_NODE(_kern, OID_AUTO, sigqueue, CTLFLAG_RW, 0, "POSIX real time signal");
121 static int max_pending_per_proc = 128;
122 SYSCTL_INT(_kern_sigqueue, OID_AUTO, max_pending_per_proc, CTLFLAG_RW,
123 &max_pending_per_proc, 0, "Max pending signals per proc");
125 static int preallocate_siginfo = 1024;
126 TUNABLE_INT("kern.sigqueue.preallocate", &preallocate_siginfo);
127 SYSCTL_INT(_kern_sigqueue, OID_AUTO, preallocate, CTLFLAG_RD,
128 &preallocate_siginfo, 0, "Preallocated signal memory size");
130 static int signal_overflow = 0;
131 SYSCTL_INT(_kern_sigqueue, OID_AUTO, overflow, CTLFLAG_RD,
132 &signal_overflow, 0, "Number of signals overflew");
134 static int signal_alloc_fail = 0;
135 SYSCTL_INT(_kern_sigqueue, OID_AUTO, alloc_fail, CTLFLAG_RD,
136 &signal_alloc_fail, 0, "signals failed to be allocated");
138 SYSINIT(signal, SI_SUB_P1003_1B, SI_ORDER_FIRST+3, sigqueue_start, NULL);
141 * Policy -- Can ucred cr1 send SIGIO to process cr2?
142 * Should use cr_cansignal() once cr_cansignal() allows SIGIO and SIGURG
143 * in the right situations.
145 #define CANSIGIO(cr1, cr2) \
146 ((cr1)->cr_uid == 0 || \
147 (cr1)->cr_ruid == (cr2)->cr_ruid || \
148 (cr1)->cr_uid == (cr2)->cr_ruid || \
149 (cr1)->cr_ruid == (cr2)->cr_uid || \
150 (cr1)->cr_uid == (cr2)->cr_uid)
153 SYSCTL_INT(_kern, OID_AUTO, sugid_coredump, CTLFLAG_RW,
154 &sugid_coredump, 0, "Enable coredumping set user/group ID processes");
156 static int do_coredump = 1;
157 SYSCTL_INT(_kern, OID_AUTO, coredump, CTLFLAG_RW,
158 &do_coredump, 0, "Enable/Disable coredumps");
160 static int set_core_nodump_flag = 0;
161 SYSCTL_INT(_kern, OID_AUTO, nodump_coredump, CTLFLAG_RW, &set_core_nodump_flag,
162 0, "Enable setting the NODUMP flag on coredump files");
165 * Signal properties and actions.
166 * The array below categorizes the signals and their default actions
167 * according to the following properties:
169 #define SA_KILL 0x01 /* terminates process by default */
170 #define SA_CORE 0x02 /* ditto and coredumps */
171 #define SA_STOP 0x04 /* suspend process */
172 #define SA_TTYSTOP 0x08 /* ditto, from tty */
173 #define SA_IGNORE 0x10 /* ignore by default */
174 #define SA_CONT 0x20 /* continue if suspended */
175 #define SA_CANTMASK 0x40 /* non-maskable, catchable */
176 #define SA_PROC 0x80 /* deliverable to any thread */
178 static int sigproptbl[NSIG] = {
179 SA_KILL|SA_PROC, /* SIGHUP */
180 SA_KILL|SA_PROC, /* SIGINT */
181 SA_KILL|SA_CORE|SA_PROC, /* SIGQUIT */
182 SA_KILL|SA_CORE, /* SIGILL */
183 SA_KILL|SA_CORE, /* SIGTRAP */
184 SA_KILL|SA_CORE, /* SIGABRT */
185 SA_KILL|SA_CORE|SA_PROC, /* SIGEMT */
186 SA_KILL|SA_CORE, /* SIGFPE */
187 SA_KILL|SA_PROC, /* SIGKILL */
188 SA_KILL|SA_CORE, /* SIGBUS */
189 SA_KILL|SA_CORE, /* SIGSEGV */
190 SA_KILL|SA_CORE, /* SIGSYS */
191 SA_KILL|SA_PROC, /* SIGPIPE */
192 SA_KILL|SA_PROC, /* SIGALRM */
193 SA_KILL|SA_PROC, /* SIGTERM */
194 SA_IGNORE|SA_PROC, /* SIGURG */
195 SA_STOP|SA_PROC, /* SIGSTOP */
196 SA_STOP|SA_TTYSTOP|SA_PROC, /* SIGTSTP */
197 SA_IGNORE|SA_CONT|SA_PROC, /* SIGCONT */
198 SA_IGNORE|SA_PROC, /* SIGCHLD */
199 SA_STOP|SA_TTYSTOP|SA_PROC, /* SIGTTIN */
200 SA_STOP|SA_TTYSTOP|SA_PROC, /* SIGTTOU */
201 SA_IGNORE|SA_PROC, /* SIGIO */
202 SA_KILL, /* SIGXCPU */
203 SA_KILL, /* SIGXFSZ */
204 SA_KILL|SA_PROC, /* SIGVTALRM */
205 SA_KILL|SA_PROC, /* SIGPROF */
206 SA_IGNORE|SA_PROC, /* SIGWINCH */
207 SA_IGNORE|SA_PROC, /* SIGINFO */
208 SA_KILL|SA_PROC, /* SIGUSR1 */
209 SA_KILL|SA_PROC, /* SIGUSR2 */
215 ksiginfo_zone = uma_zcreate("ksiginfo", sizeof(ksiginfo_t),
216 NULL, NULL, NULL, NULL, UMA_ALIGN_PTR, 0);
217 uma_prealloc(ksiginfo_zone, preallocate_siginfo);
218 p31b_setcfg(CTL_P1003_1B_REALTIME_SIGNALS, _POSIX_REALTIME_SIGNALS);
219 p31b_setcfg(CTL_P1003_1B_RTSIG_MAX, SIGRTMAX - SIGRTMIN + 1);
220 p31b_setcfg(CTL_P1003_1B_SIGQUEUE_MAX, max_pending_per_proc);
224 ksiginfo_alloc(int wait)
231 if (ksiginfo_zone != NULL)
232 return ((ksiginfo_t *)uma_zalloc(ksiginfo_zone, flags));
237 ksiginfo_free(ksiginfo_t *ksi)
239 uma_zfree(ksiginfo_zone, ksi);
243 ksiginfo_tryfree(ksiginfo_t *ksi)
245 if (!(ksi->ksi_flags & KSI_EXT)) {
246 uma_zfree(ksiginfo_zone, ksi);
253 sigqueue_init(sigqueue_t *list, struct proc *p)
255 SIGEMPTYSET(list->sq_signals);
256 SIGEMPTYSET(list->sq_kill);
257 TAILQ_INIT(&list->sq_list);
259 list->sq_flags = SQ_INIT;
263 * Get a signal's ksiginfo.
265 * 0 - signal not found
266 * others - signal number
269 sigqueue_get(sigqueue_t *sq, int signo, ksiginfo_t *si)
271 struct proc *p = sq->sq_proc;
272 struct ksiginfo *ksi, *next;
275 KASSERT(sq->sq_flags & SQ_INIT, ("sigqueue not inited"));
277 if (!SIGISMEMBER(sq->sq_signals, signo))
280 if (SIGISMEMBER(sq->sq_kill, signo)) {
282 SIGDELSET(sq->sq_kill, signo);
285 for (ksi = TAILQ_FIRST(&sq->sq_list); ksi != NULL; ksi = next) {
286 next = TAILQ_NEXT(ksi, ksi_link);
287 if (ksi->ksi_signo == signo) {
289 TAILQ_REMOVE(&sq->sq_list, ksi, ksi_link);
290 ksi->ksi_sigq = NULL;
291 ksiginfo_copy(ksi, si);
292 if (ksiginfo_tryfree(ksi) && p != NULL)
300 SIGDELSET(sq->sq_signals, signo);
301 si->ksi_signo = signo;
306 sigqueue_take(ksiginfo_t *ksi)
312 if (ksi == NULL || (sq = ksi->ksi_sigq) == NULL)
316 TAILQ_REMOVE(&sq->sq_list, ksi, ksi_link);
317 ksi->ksi_sigq = NULL;
318 if (!(ksi->ksi_flags & KSI_EXT) && p != NULL)
321 for (kp = TAILQ_FIRST(&sq->sq_list); kp != NULL;
322 kp = TAILQ_NEXT(kp, ksi_link)) {
323 if (kp->ksi_signo == ksi->ksi_signo)
326 if (kp == NULL && !SIGISMEMBER(sq->sq_kill, ksi->ksi_signo))
327 SIGDELSET(sq->sq_signals, ksi->ksi_signo);
331 sigqueue_add(sigqueue_t *sq, int signo, ksiginfo_t *si)
333 struct proc *p = sq->sq_proc;
334 struct ksiginfo *ksi;
337 KASSERT(sq->sq_flags & SQ_INIT, ("sigqueue not inited"));
339 if (signo == SIGKILL || signo == SIGSTOP || si == NULL) {
340 SIGADDSET(sq->sq_kill, signo);
344 /* directly insert the ksi, don't copy it */
345 if (si->ksi_flags & KSI_INS) {
346 TAILQ_INSERT_TAIL(&sq->sq_list, si, ksi_link);
351 if (__predict_false(ksiginfo_zone == NULL)) {
352 SIGADDSET(sq->sq_kill, signo);
356 if (p != NULL && p->p_pendingcnt >= max_pending_per_proc) {
359 } else if ((ksi = ksiginfo_alloc(0)) == NULL) {
365 ksiginfo_copy(si, ksi);
366 ksi->ksi_signo = signo;
367 TAILQ_INSERT_TAIL(&sq->sq_list, ksi, ksi_link);
371 if ((si->ksi_flags & KSI_TRAP) != 0) {
373 SIGADDSET(sq->sq_kill, signo);
382 SIGADDSET(sq->sq_signals, signo);
387 sigqueue_flush(sigqueue_t *sq)
389 struct proc *p = sq->sq_proc;
392 KASSERT(sq->sq_flags & SQ_INIT, ("sigqueue not inited"));
395 PROC_LOCK_ASSERT(p, MA_OWNED);
397 while ((ksi = TAILQ_FIRST(&sq->sq_list)) != NULL) {
398 TAILQ_REMOVE(&sq->sq_list, ksi, ksi_link);
399 ksi->ksi_sigq = NULL;
400 if (ksiginfo_tryfree(ksi) && p != NULL)
404 SIGEMPTYSET(sq->sq_signals);
405 SIGEMPTYSET(sq->sq_kill);
409 sigqueue_collect_set(sigqueue_t *sq, sigset_t *set)
413 KASSERT(sq->sq_flags & SQ_INIT, ("sigqueue not inited"));
415 TAILQ_FOREACH(ksi, &sq->sq_list, ksi_link)
416 SIGADDSET(*set, ksi->ksi_signo);
417 SIGSETOR(*set, sq->sq_kill);
421 sigqueue_move_set(sigqueue_t *src, sigqueue_t *dst, sigset_t *setp)
424 struct proc *p1, *p2;
425 ksiginfo_t *ksi, *next;
427 KASSERT(src->sq_flags & SQ_INIT, ("src sigqueue not inited"));
428 KASSERT(dst->sq_flags & SQ_INIT, ("dst sigqueue not inited"));
430 * make a copy, this allows setp to point to src or dst
431 * sq_signals without trouble.
436 /* Move siginfo to target list */
437 for (ksi = TAILQ_FIRST(&src->sq_list); ksi != NULL; ksi = next) {
438 next = TAILQ_NEXT(ksi, ksi_link);
439 if (SIGISMEMBER(set, ksi->ksi_signo)) {
440 TAILQ_REMOVE(&src->sq_list, ksi, ksi_link);
443 TAILQ_INSERT_TAIL(&dst->sq_list, ksi, ksi_link);
450 /* Move pending bits to target list */
453 SIGSETOR(dst->sq_kill, tmp);
454 SIGSETNAND(src->sq_kill, tmp);
456 tmp = src->sq_signals;
458 SIGSETOR(dst->sq_signals, tmp);
459 SIGSETNAND(src->sq_signals, tmp);
461 /* Finally, rescan src queue and set pending bits for it */
462 sigqueue_collect_set(src, &src->sq_signals);
466 sigqueue_move(sigqueue_t *src, sigqueue_t *dst, int signo)
471 SIGADDSET(set, signo);
472 sigqueue_move_set(src, dst, &set);
476 sigqueue_delete_set(sigqueue_t *sq, sigset_t *set)
478 struct proc *p = sq->sq_proc;
479 ksiginfo_t *ksi, *next;
481 KASSERT(sq->sq_flags & SQ_INIT, ("src sigqueue not inited"));
483 /* Remove siginfo queue */
484 for (ksi = TAILQ_FIRST(&sq->sq_list); ksi != NULL; ksi = next) {
485 next = TAILQ_NEXT(ksi, ksi_link);
486 if (SIGISMEMBER(*set, ksi->ksi_signo)) {
487 TAILQ_REMOVE(&sq->sq_list, ksi, ksi_link);
488 ksi->ksi_sigq = NULL;
489 if (ksiginfo_tryfree(ksi) && p != NULL)
493 SIGSETNAND(sq->sq_kill, *set);
494 SIGSETNAND(sq->sq_signals, *set);
495 /* Finally, rescan queue and set pending bits for it */
496 sigqueue_collect_set(sq, &sq->sq_signals);
500 sigqueue_delete(sigqueue_t *sq, int signo)
505 SIGADDSET(set, signo);
506 sigqueue_delete_set(sq, &set);
509 /* Remove a set of signals for a process */
511 sigqueue_delete_set_proc(struct proc *p, sigset_t *set)
516 PROC_LOCK_ASSERT(p, MA_OWNED);
518 sigqueue_init(&worklist, NULL);
519 sigqueue_move_set(&p->p_sigqueue, &worklist, set);
521 mtx_lock_spin(&sched_lock);
522 FOREACH_THREAD_IN_PROC(p, td0)
523 sigqueue_move_set(&td0->td_sigqueue, &worklist, set);
524 mtx_unlock_spin(&sched_lock);
526 sigqueue_flush(&worklist);
530 sigqueue_delete_proc(struct proc *p, int signo)
535 SIGADDSET(set, signo);
536 sigqueue_delete_set_proc(p, &set);
540 sigqueue_delete_stopmask_proc(struct proc *p)
545 SIGADDSET(set, SIGSTOP);
546 SIGADDSET(set, SIGTSTP);
547 SIGADDSET(set, SIGTTIN);
548 SIGADDSET(set, SIGTTOU);
549 sigqueue_delete_set_proc(p, &set);
553 * Determine signal that should be delivered to process p, the current
554 * process, 0 if none. If there is a pending stop signal with default
555 * action, the process stops in issignal().
560 cursig(struct thread *td)
562 PROC_LOCK_ASSERT(td->td_proc, MA_OWNED);
563 mtx_assert(&td->td_proc->p_sigacts->ps_mtx, MA_OWNED);
564 mtx_assert(&sched_lock, MA_NOTOWNED);
565 return (SIGPENDING(td) ? issignal(td) : 0);
569 * Arrange for ast() to handle unmasked pending signals on return to user
570 * mode. This must be called whenever a signal is added to td_sigqueue or
571 * unmasked in td_sigmask.
574 signotify(struct thread *td)
581 PROC_LOCK_ASSERT(p, MA_OWNED);
584 * If our mask changed we may have to move signal that were
585 * previously masked by all threads to our sigqueue.
587 set = p->p_sigqueue.sq_signals;
588 if (p->p_flag & P_SA)
589 saved = p->p_sigqueue.sq_signals;
590 SIGSETNAND(set, td->td_sigmask);
591 if (! SIGISEMPTY(set))
592 sigqueue_move_set(&p->p_sigqueue, &td->td_sigqueue, &set);
593 if (SIGPENDING(td)) {
594 mtx_lock_spin(&sched_lock);
595 td->td_flags |= TDF_NEEDSIGCHK | TDF_ASTPENDING;
596 mtx_unlock_spin(&sched_lock);
598 if ((p->p_flag & P_SA) && !(p->p_flag & P_SIGEVENT)) {
599 if (!SIGSETEQ(saved, p->p_sigqueue.sq_signals)) {
600 /* pending set changed */
601 p->p_flag |= P_SIGEVENT;
602 wakeup(&p->p_siglist);
608 sigonstack(size_t sp)
610 struct thread *td = curthread;
612 return ((td->td_pflags & TDP_ALTSTACK) ?
613 #if defined(COMPAT_43)
614 ((td->td_sigstk.ss_size == 0) ?
615 (td->td_sigstk.ss_flags & SS_ONSTACK) :
616 ((sp - (size_t)td->td_sigstk.ss_sp) < td->td_sigstk.ss_size))
618 ((sp - (size_t)td->td_sigstk.ss_sp) < td->td_sigstk.ss_size)
627 if (sig > 0 && sig < NSIG)
628 return (sigproptbl[_SIG_IDX(sig)]);
633 sig_ffs(sigset_t *set)
637 for (i = 0; i < _SIG_WORDS; i++)
639 return (ffs(set->__bits[i]) + (i * 32));
652 kern_sigaction(td, sig, act, oact, flags)
655 struct sigaction *act, *oact;
659 struct proc *p = td->td_proc;
661 if (!_SIG_VALID(sig))
666 mtx_lock(&ps->ps_mtx);
668 oact->sa_handler = ps->ps_sigact[_SIG_IDX(sig)];
669 oact->sa_mask = ps->ps_catchmask[_SIG_IDX(sig)];
671 if (SIGISMEMBER(ps->ps_sigonstack, sig))
672 oact->sa_flags |= SA_ONSTACK;
673 if (!SIGISMEMBER(ps->ps_sigintr, sig))
674 oact->sa_flags |= SA_RESTART;
675 if (SIGISMEMBER(ps->ps_sigreset, sig))
676 oact->sa_flags |= SA_RESETHAND;
677 if (SIGISMEMBER(ps->ps_signodefer, sig))
678 oact->sa_flags |= SA_NODEFER;
679 if (SIGISMEMBER(ps->ps_siginfo, sig))
680 oact->sa_flags |= SA_SIGINFO;
681 if (sig == SIGCHLD && ps->ps_flag & PS_NOCLDSTOP)
682 oact->sa_flags |= SA_NOCLDSTOP;
683 if (sig == SIGCHLD && ps->ps_flag & PS_NOCLDWAIT)
684 oact->sa_flags |= SA_NOCLDWAIT;
687 if ((sig == SIGKILL || sig == SIGSTOP) &&
688 act->sa_handler != SIG_DFL) {
689 mtx_unlock(&ps->ps_mtx);
695 * Change setting atomically.
698 ps->ps_catchmask[_SIG_IDX(sig)] = act->sa_mask;
699 SIG_CANTMASK(ps->ps_catchmask[_SIG_IDX(sig)]);
700 if (act->sa_flags & SA_SIGINFO) {
701 ps->ps_sigact[_SIG_IDX(sig)] =
702 (__sighandler_t *)act->sa_sigaction;
703 SIGADDSET(ps->ps_siginfo, sig);
705 ps->ps_sigact[_SIG_IDX(sig)] = act->sa_handler;
706 SIGDELSET(ps->ps_siginfo, sig);
708 if (!(act->sa_flags & SA_RESTART))
709 SIGADDSET(ps->ps_sigintr, sig);
711 SIGDELSET(ps->ps_sigintr, sig);
712 if (act->sa_flags & SA_ONSTACK)
713 SIGADDSET(ps->ps_sigonstack, sig);
715 SIGDELSET(ps->ps_sigonstack, sig);
716 if (act->sa_flags & SA_RESETHAND)
717 SIGADDSET(ps->ps_sigreset, sig);
719 SIGDELSET(ps->ps_sigreset, sig);
720 if (act->sa_flags & SA_NODEFER)
721 SIGADDSET(ps->ps_signodefer, sig);
723 SIGDELSET(ps->ps_signodefer, sig);
724 if (sig == SIGCHLD) {
725 if (act->sa_flags & SA_NOCLDSTOP)
726 ps->ps_flag |= PS_NOCLDSTOP;
728 ps->ps_flag &= ~PS_NOCLDSTOP;
729 if (act->sa_flags & SA_NOCLDWAIT) {
731 * Paranoia: since SA_NOCLDWAIT is implemented
732 * by reparenting the dying child to PID 1 (and
733 * trust it to reap the zombie), PID 1 itself
734 * is forbidden to set SA_NOCLDWAIT.
737 ps->ps_flag &= ~PS_NOCLDWAIT;
739 ps->ps_flag |= PS_NOCLDWAIT;
741 ps->ps_flag &= ~PS_NOCLDWAIT;
742 if (ps->ps_sigact[_SIG_IDX(SIGCHLD)] == SIG_IGN)
743 ps->ps_flag |= PS_CLDSIGIGN;
745 ps->ps_flag &= ~PS_CLDSIGIGN;
748 * Set bit in ps_sigignore for signals that are set to SIG_IGN,
749 * and for signals set to SIG_DFL where the default is to
750 * ignore. However, don't put SIGCONT in ps_sigignore, as we
751 * have to restart the process.
753 if (ps->ps_sigact[_SIG_IDX(sig)] == SIG_IGN ||
754 (sigprop(sig) & SA_IGNORE &&
755 ps->ps_sigact[_SIG_IDX(sig)] == SIG_DFL)) {
756 if ((p->p_flag & P_SA) &&
757 SIGISMEMBER(p->p_sigqueue.sq_signals, sig)) {
758 p->p_flag |= P_SIGEVENT;
759 wakeup(&p->p_siglist);
761 /* never to be seen again */
762 sigqueue_delete_proc(p, sig);
764 /* easier in psignal */
765 SIGADDSET(ps->ps_sigignore, sig);
766 SIGDELSET(ps->ps_sigcatch, sig);
768 SIGDELSET(ps->ps_sigignore, sig);
769 if (ps->ps_sigact[_SIG_IDX(sig)] == SIG_DFL)
770 SIGDELSET(ps->ps_sigcatch, sig);
772 SIGADDSET(ps->ps_sigcatch, sig);
774 #ifdef COMPAT_FREEBSD4
775 if (ps->ps_sigact[_SIG_IDX(sig)] == SIG_IGN ||
776 ps->ps_sigact[_SIG_IDX(sig)] == SIG_DFL ||
777 (flags & KSA_FREEBSD4) == 0)
778 SIGDELSET(ps->ps_freebsd4, sig);
780 SIGADDSET(ps->ps_freebsd4, sig);
783 if (ps->ps_sigact[_SIG_IDX(sig)] == SIG_IGN ||
784 ps->ps_sigact[_SIG_IDX(sig)] == SIG_DFL ||
785 (flags & KSA_OSIGSET) == 0)
786 SIGDELSET(ps->ps_osigset, sig);
788 SIGADDSET(ps->ps_osigset, sig);
791 mtx_unlock(&ps->ps_mtx);
796 #ifndef _SYS_SYSPROTO_H_
797 struct sigaction_args {
799 struct sigaction *act;
800 struct sigaction *oact;
809 register struct sigaction_args *uap;
811 struct sigaction act, oact;
812 register struct sigaction *actp, *oactp;
815 actp = (uap->act != NULL) ? &act : NULL;
816 oactp = (uap->oact != NULL) ? &oact : NULL;
818 error = copyin(uap->act, actp, sizeof(act));
822 error = kern_sigaction(td, uap->sig, actp, oactp, 0);
824 error = copyout(oactp, uap->oact, sizeof(oact));
828 #ifdef COMPAT_FREEBSD4
829 #ifndef _SYS_SYSPROTO_H_
830 struct freebsd4_sigaction_args {
832 struct sigaction *act;
833 struct sigaction *oact;
840 freebsd4_sigaction(td, uap)
842 register struct freebsd4_sigaction_args *uap;
844 struct sigaction act, oact;
845 register struct sigaction *actp, *oactp;
849 actp = (uap->act != NULL) ? &act : NULL;
850 oactp = (uap->oact != NULL) ? &oact : NULL;
852 error = copyin(uap->act, actp, sizeof(act));
856 error = kern_sigaction(td, uap->sig, actp, oactp, KSA_FREEBSD4);
858 error = copyout(oactp, uap->oact, sizeof(oact));
861 #endif /* COMAPT_FREEBSD4 */
863 #ifdef COMPAT_43 /* XXX - COMPAT_FBSD3 */
864 #ifndef _SYS_SYSPROTO_H_
865 struct osigaction_args {
867 struct osigaction *nsa;
868 struct osigaction *osa;
877 register struct osigaction_args *uap;
879 struct osigaction sa;
880 struct sigaction nsa, osa;
881 register struct sigaction *nsap, *osap;
884 if (uap->signum <= 0 || uap->signum >= ONSIG)
887 nsap = (uap->nsa != NULL) ? &nsa : NULL;
888 osap = (uap->osa != NULL) ? &osa : NULL;
891 error = copyin(uap->nsa, &sa, sizeof(sa));
894 nsap->sa_handler = sa.sa_handler;
895 nsap->sa_flags = sa.sa_flags;
896 OSIG2SIG(sa.sa_mask, nsap->sa_mask);
898 error = kern_sigaction(td, uap->signum, nsap, osap, KSA_OSIGSET);
899 if (osap && !error) {
900 sa.sa_handler = osap->sa_handler;
901 sa.sa_flags = osap->sa_flags;
902 SIG2OSIG(osap->sa_mask, sa.sa_mask);
903 error = copyout(&sa, uap->osa, sizeof(sa));
908 #if !defined(__i386__) && !defined(__alpha__)
909 /* Avoid replicating the same stub everywhere */
913 struct osigreturn_args *uap;
916 return (nosys(td, (struct nosys_args *)uap));
919 #endif /* COMPAT_43 */
922 * Initialize signal state for process 0;
923 * set to ignore signals that are ignored by default.
934 mtx_lock(&ps->ps_mtx);
935 for (i = 1; i <= NSIG; i++)
936 if (sigprop(i) & SA_IGNORE && i != SIGCONT)
937 SIGADDSET(ps->ps_sigignore, i);
938 mtx_unlock(&ps->ps_mtx);
943 * Reset signals for an exec of the specified process.
946 execsigs(struct proc *p)
953 * Reset caught signals. Held signals remain held
954 * through td_sigmask (unless they were caught,
955 * and are now ignored by default).
957 PROC_LOCK_ASSERT(p, MA_OWNED);
958 td = FIRST_THREAD_IN_PROC(p);
960 mtx_lock(&ps->ps_mtx);
961 while (SIGNOTEMPTY(ps->ps_sigcatch)) {
962 sig = sig_ffs(&ps->ps_sigcatch);
963 SIGDELSET(ps->ps_sigcatch, sig);
964 if (sigprop(sig) & SA_IGNORE) {
966 SIGADDSET(ps->ps_sigignore, sig);
967 sigqueue_delete_proc(p, sig);
969 ps->ps_sigact[_SIG_IDX(sig)] = SIG_DFL;
972 * Reset stack state to the user stack.
973 * Clear set of signals caught on the signal stack.
975 td->td_sigstk.ss_flags = SS_DISABLE;
976 td->td_sigstk.ss_size = 0;
977 td->td_sigstk.ss_sp = 0;
978 td->td_pflags &= ~TDP_ALTSTACK;
980 * Reset no zombies if child dies flag as Solaris does.
982 ps->ps_flag &= ~(PS_NOCLDWAIT | PS_CLDSIGIGN);
983 if (ps->ps_sigact[_SIG_IDX(SIGCHLD)] == SIG_IGN)
984 ps->ps_sigact[_SIG_IDX(SIGCHLD)] = SIG_DFL;
985 mtx_unlock(&ps->ps_mtx);
991 * Manipulate signal mask.
994 kern_sigprocmask(td, how, set, oset, old)
997 sigset_t *set, *oset;
1002 PROC_LOCK(td->td_proc);
1004 *oset = td->td_sigmask;
1011 SIGSETOR(td->td_sigmask, *set);
1014 SIGSETNAND(td->td_sigmask, *set);
1020 SIGSETLO(td->td_sigmask, *set);
1022 td->td_sigmask = *set;
1030 PROC_UNLOCK(td->td_proc);
1035 * sigprocmask() - MP SAFE
1038 #ifndef _SYS_SYSPROTO_H_
1039 struct sigprocmask_args {
1041 const sigset_t *set;
1046 sigprocmask(td, uap)
1047 register struct thread *td;
1048 struct sigprocmask_args *uap;
1051 sigset_t *setp, *osetp;
1054 setp = (uap->set != NULL) ? &set : NULL;
1055 osetp = (uap->oset != NULL) ? &oset : NULL;
1057 error = copyin(uap->set, setp, sizeof(set));
1061 error = kern_sigprocmask(td, uap->how, setp, osetp, 0);
1062 if (osetp && !error) {
1063 error = copyout(osetp, uap->oset, sizeof(oset));
1068 #ifdef COMPAT_43 /* XXX - COMPAT_FBSD3 */
1070 * osigprocmask() - MP SAFE
1072 #ifndef _SYS_SYSPROTO_H_
1073 struct osigprocmask_args {
1079 osigprocmask(td, uap)
1080 register struct thread *td;
1081 struct osigprocmask_args *uap;
1086 OSIG2SIG(uap->mask, set);
1087 error = kern_sigprocmask(td, uap->how, &set, &oset, 1);
1088 SIG2OSIG(oset, td->td_retval[0]);
1091 #endif /* COMPAT_43 */
1097 sigwait(struct thread *td, struct sigwait_args *uap)
1103 error = copyin(uap->set, &set, sizeof(set));
1105 td->td_retval[0] = error;
1109 error = kern_sigtimedwait(td, set, &ksi, NULL);
1111 if (error == ERESTART)
1113 td->td_retval[0] = error;
1117 error = copyout(&ksi.ksi_signo, uap->sig, sizeof(ksi.ksi_signo));
1118 td->td_retval[0] = error;
1125 sigtimedwait(struct thread *td, struct sigtimedwait_args *uap)
1128 struct timespec *timeout;
1134 error = copyin(uap->timeout, &ts, sizeof(ts));
1142 error = copyin(uap->set, &set, sizeof(set));
1146 error = kern_sigtimedwait(td, set, &ksi, timeout);
1151 error = copyout(&ksi.ksi_info, uap->info, sizeof(siginfo_t));
1154 td->td_retval[0] = ksi.ksi_signo;
1162 sigwaitinfo(struct thread *td, struct sigwaitinfo_args *uap)
1168 error = copyin(uap->set, &set, sizeof(set));
1172 error = kern_sigtimedwait(td, set, &ksi, NULL);
1177 error = copyout(&ksi.ksi_info, uap->info, sizeof(siginfo_t));
1180 td->td_retval[0] = ksi.ksi_signo;
1185 kern_sigtimedwait(struct thread *td, sigset_t waitset, ksiginfo_t *ksi,
1186 struct timespec *timeout)
1191 int error, sig, hz, i, timevalid = 0;
1192 struct timespec rts, ets, ts;
1198 SIG_CANTMASK(waitset);
1202 savedmask = td->td_sigmask;
1204 if (timeout->tv_nsec >= 0 && timeout->tv_nsec < 1000000000) {
1206 getnanouptime(&rts);
1208 timespecadd(&ets, timeout);
1213 for (i = 1; i <= _SIG_MAXSIG; ++i) {
1214 if (!SIGISMEMBER(waitset, i))
1216 if (!SIGISMEMBER(td->td_sigqueue.sq_signals, i)) {
1217 if (SIGISMEMBER(p->p_sigqueue.sq_signals, i)) {
1218 if (p->p_flag & P_SA) {
1219 p->p_flag |= P_SIGEVENT;
1220 wakeup(&p->p_siglist);
1222 sigqueue_move(&p->p_sigqueue,
1223 &td->td_sigqueue, i);
1228 SIGFILLSET(td->td_sigmask);
1229 SIG_CANTMASK(td->td_sigmask);
1230 SIGDELSET(td->td_sigmask, i);
1231 mtx_lock(&ps->ps_mtx);
1233 mtx_unlock(&ps->ps_mtx);
1238 * Because cursig() may have stopped current thread,
1239 * after it is resumed, things may have already been
1240 * changed, it should rescan any pending signals.
1250 * POSIX says this must be checked after looking for pending
1258 getnanouptime(&rts);
1259 if (timespeccmp(&rts, &ets, >=)) {
1264 timespecsub(&ts, &rts);
1265 TIMESPEC_TO_TIMEVAL(&tv, &ts);
1270 td->td_sigmask = savedmask;
1271 SIGSETNAND(td->td_sigmask, waitset);
1273 error = msleep(&ps, &p->p_mtx, PPAUSE|PCATCH, "sigwait", hz);
1275 if (error == ERESTART) {
1276 /* timeout can not be restarted. */
1278 } else if (error == EAGAIN) {
1279 /* will calculate timeout by ourself. */
1286 td->td_sigmask = savedmask;
1290 sigqueue_get(&td->td_sigqueue, sig, ksi);
1291 ksi->ksi_signo = sig;
1292 if (ksi->ksi_code == SI_TIMER)
1293 itimer_accept(p, ksi->ksi_timerid, ksi);
1297 if (KTRPOINT(td, KTR_PSIG)) {
1300 mtx_lock(&ps->ps_mtx);
1301 action = ps->ps_sigact[_SIG_IDX(sig)];
1302 mtx_unlock(&ps->ps_mtx);
1303 ktrpsig(sig, action, &td->td_sigmask, 0);
1306 _STOPEVENT(p, S_SIG, sig);
1308 if (sig == SIGKILL) {
1309 p->p_code = ksi->ksi_code;
1318 #ifndef _SYS_SYSPROTO_H_
1319 struct sigpending_args {
1329 struct sigpending_args *uap;
1331 struct proc *p = td->td_proc;
1335 pending = p->p_sigqueue.sq_signals;
1336 SIGSETOR(pending, td->td_sigqueue.sq_signals);
1338 return (copyout(&pending, uap->set, sizeof(sigset_t)));
1341 #ifdef COMPAT_43 /* XXX - COMPAT_FBSD3 */
1342 #ifndef _SYS_SYSPROTO_H_
1343 struct osigpending_args {
1351 osigpending(td, uap)
1353 struct osigpending_args *uap;
1355 struct proc *p = td->td_proc;
1359 pending = p->p_sigqueue.sq_signals;
1360 SIGSETOR(pending, td->td_sigqueue.sq_signals);
1362 SIG2OSIG(pending, td->td_retval[0]);
1365 #endif /* COMPAT_43 */
1367 #if defined(COMPAT_43)
1369 * Generalized interface signal handler, 4.3-compatible.
1371 #ifndef _SYS_SYSPROTO_H_
1372 struct osigvec_args {
1385 register struct osigvec_args *uap;
1388 struct sigaction nsa, osa;
1389 register struct sigaction *nsap, *osap;
1392 if (uap->signum <= 0 || uap->signum >= ONSIG)
1394 nsap = (uap->nsv != NULL) ? &nsa : NULL;
1395 osap = (uap->osv != NULL) ? &osa : NULL;
1397 error = copyin(uap->nsv, &vec, sizeof(vec));
1400 nsap->sa_handler = vec.sv_handler;
1401 OSIG2SIG(vec.sv_mask, nsap->sa_mask);
1402 nsap->sa_flags = vec.sv_flags;
1403 nsap->sa_flags ^= SA_RESTART; /* opposite of SV_INTERRUPT */
1405 error = kern_sigaction(td, uap->signum, nsap, osap, KSA_OSIGSET);
1406 if (osap && !error) {
1407 vec.sv_handler = osap->sa_handler;
1408 SIG2OSIG(osap->sa_mask, vec.sv_mask);
1409 vec.sv_flags = osap->sa_flags;
1410 vec.sv_flags &= ~SA_NOCLDWAIT;
1411 vec.sv_flags ^= SA_RESTART;
1412 error = copyout(&vec, uap->osv, sizeof(vec));
1417 #ifndef _SYS_SYSPROTO_H_
1418 struct osigblock_args {
1427 register struct thread *td;
1428 struct osigblock_args *uap;
1430 struct proc *p = td->td_proc;
1433 OSIG2SIG(uap->mask, set);
1436 SIG2OSIG(td->td_sigmask, td->td_retval[0]);
1437 SIGSETOR(td->td_sigmask, set);
1442 #ifndef _SYS_SYSPROTO_H_
1443 struct osigsetmask_args {
1451 osigsetmask(td, uap)
1453 struct osigsetmask_args *uap;
1455 struct proc *p = td->td_proc;
1458 OSIG2SIG(uap->mask, set);
1461 SIG2OSIG(td->td_sigmask, td->td_retval[0]);
1462 SIGSETLO(td->td_sigmask, set);
1467 #endif /* COMPAT_43 */
1470 * Suspend calling thread until signal, providing mask to be set
1473 #ifndef _SYS_SYSPROTO_H_
1474 struct sigsuspend_args {
1475 const sigset_t *sigmask;
1485 struct sigsuspend_args *uap;
1490 error = copyin(uap->sigmask, &mask, sizeof(mask));
1493 return (kern_sigsuspend(td, mask));
1497 kern_sigsuspend(struct thread *td, sigset_t mask)
1499 struct proc *p = td->td_proc;
1502 * When returning from sigsuspend, we want
1503 * the old mask to be restored after the
1504 * signal handler has finished. Thus, we
1505 * save it here and mark the sigacts structure
1509 td->td_oldsigmask = td->td_sigmask;
1510 td->td_pflags |= TDP_OLDMASK;
1512 td->td_sigmask = mask;
1514 while (msleep(&p->p_sigacts, &p->p_mtx, PPAUSE|PCATCH, "pause", 0) == 0)
1517 /* always return EINTR rather than ERESTART... */
1521 #ifdef COMPAT_43 /* XXX - COMPAT_FBSD3 */
1523 * Compatibility sigsuspend call for old binaries. Note nonstandard calling
1524 * convention: libc stub passes mask, not pointer, to save a copyin.
1526 #ifndef _SYS_SYSPROTO_H_
1527 struct osigsuspend_args {
1536 osigsuspend(td, uap)
1538 struct osigsuspend_args *uap;
1540 struct proc *p = td->td_proc;
1544 td->td_oldsigmask = td->td_sigmask;
1545 td->td_pflags |= TDP_OLDMASK;
1546 OSIG2SIG(uap->mask, mask);
1548 SIGSETLO(td->td_sigmask, mask);
1550 while (msleep(&p->p_sigacts, &p->p_mtx, PPAUSE|PCATCH, "opause", 0) == 0)
1553 /* always return EINTR rather than ERESTART... */
1556 #endif /* COMPAT_43 */
1558 #if defined(COMPAT_43)
1559 #ifndef _SYS_SYSPROTO_H_
1560 struct osigstack_args {
1561 struct sigstack *nss;
1562 struct sigstack *oss;
1572 register struct osigstack_args *uap;
1574 struct sigstack nss, oss;
1577 if (uap->nss != NULL) {
1578 error = copyin(uap->nss, &nss, sizeof(nss));
1582 oss.ss_sp = td->td_sigstk.ss_sp;
1583 oss.ss_onstack = sigonstack(cpu_getstack(td));
1584 if (uap->nss != NULL) {
1585 td->td_sigstk.ss_sp = nss.ss_sp;
1586 td->td_sigstk.ss_size = 0;
1587 td->td_sigstk.ss_flags |= nss.ss_onstack & SS_ONSTACK;
1588 td->td_pflags |= TDP_ALTSTACK;
1590 if (uap->oss != NULL)
1591 error = copyout(&oss, uap->oss, sizeof(oss));
1595 #endif /* COMPAT_43 */
1597 #ifndef _SYS_SYSPROTO_H_
1598 struct sigaltstack_args {
1608 sigaltstack(td, uap)
1610 register struct sigaltstack_args *uap;
1615 if (uap->ss != NULL) {
1616 error = copyin(uap->ss, &ss, sizeof(ss));
1620 error = kern_sigaltstack(td, (uap->ss != NULL) ? &ss : NULL,
1621 (uap->oss != NULL) ? &oss : NULL);
1624 if (uap->oss != NULL)
1625 error = copyout(&oss, uap->oss, sizeof(stack_t));
1630 kern_sigaltstack(struct thread *td, stack_t *ss, stack_t *oss)
1632 struct proc *p = td->td_proc;
1635 oonstack = sigonstack(cpu_getstack(td));
1638 *oss = td->td_sigstk;
1639 oss->ss_flags = (td->td_pflags & TDP_ALTSTACK)
1640 ? ((oonstack) ? SS_ONSTACK : 0) : SS_DISABLE;
1646 if ((ss->ss_flags & ~SS_DISABLE) != 0)
1648 if (!(ss->ss_flags & SS_DISABLE)) {
1649 if (ss->ss_size < p->p_sysent->sv_minsigstksz)
1652 td->td_sigstk = *ss;
1653 td->td_pflags |= TDP_ALTSTACK;
1655 td->td_pflags &= ~TDP_ALTSTACK;
1662 * Common code for kill process group/broadcast kill.
1663 * cp is calling process.
1666 killpg1(td, sig, pgid, all)
1667 register struct thread *td;
1670 register struct proc *p;
1678 sx_slock(&allproc_lock);
1679 LIST_FOREACH(p, &allproc, p_list) {
1681 if (p->p_pid <= 1 || p->p_flag & P_SYSTEM ||
1686 if (p_cansignal(td, p, sig) == 0) {
1693 sx_sunlock(&allproc_lock);
1695 sx_slock(&proctree_lock);
1698 * zero pgid means send to my process group.
1700 pgrp = td->td_proc->p_pgrp;
1703 pgrp = pgfind(pgid);
1705 sx_sunlock(&proctree_lock);
1709 sx_sunlock(&proctree_lock);
1710 LIST_FOREACH(p, &pgrp->pg_members, p_pglist) {
1712 if (p->p_pid <= 1 || p->p_flag & P_SYSTEM) {
1716 if (p_cansignal(td, p, sig) == 0) {
1725 return (nfound ? 0 : ESRCH);
1728 #ifndef _SYS_SYSPROTO_H_
1740 register struct thread *td;
1741 register struct kill_args *uap;
1743 register struct proc *p;
1746 AUDIT_ARG(signum, uap->signum);
1747 if ((u_int)uap->signum > _SIG_MAXSIG)
1751 /* kill single process */
1752 if ((p = pfind(uap->pid)) == NULL) {
1753 if ((p = zpfind(uap->pid)) == NULL)
1756 AUDIT_ARG(process, p);
1757 error = p_cansignal(td, p, uap->signum);
1758 if (error == 0 && uap->signum)
1759 psignal(p, uap->signum);
1763 AUDIT_ARG(pid, uap->pid);
1765 case -1: /* broadcast signal */
1766 return (killpg1(td, uap->signum, 0, 1));
1767 case 0: /* signal own process group */
1768 return (killpg1(td, uap->signum, 0, 0));
1769 default: /* negative explicit process group */
1770 return (killpg1(td, uap->signum, -uap->pid, 0));
1775 #if defined(COMPAT_43)
1776 #ifndef _SYS_SYSPROTO_H_
1777 struct okillpg_args {
1789 register struct okillpg_args *uap;
1792 AUDIT_ARG(signum, uap->signum);
1793 AUDIT_ARG(pid, uap->pgid);
1794 if ((u_int)uap->signum > _SIG_MAXSIG)
1797 return (killpg1(td, uap->signum, uap->pgid, 0));
1799 #endif /* COMPAT_43 */
1801 #ifndef _SYS_SYSPROTO_H_
1802 struct sigqueue_args {
1805 /* union sigval */ void *value;
1810 sigqueue(struct thread *td, struct sigqueue_args *uap)
1816 if ((u_int)uap->signum > _SIG_MAXSIG)
1820 * Specification says sigqueue can only send signal to
1826 if ((p = pfind(uap->pid)) == NULL) {
1827 if ((p = zpfind(uap->pid)) == NULL)
1830 error = p_cansignal(td, p, uap->signum);
1831 if (error == 0 && uap->signum != 0) {
1832 ksiginfo_init(&ksi);
1833 ksi.ksi_signo = uap->signum;
1834 ksi.ksi_code = SI_QUEUE;
1835 ksi.ksi_pid = td->td_proc->p_pid;
1836 ksi.ksi_uid = td->td_ucred->cr_ruid;
1837 ksi.ksi_value.sival_ptr = uap->value;
1838 error = tdsignal(p, NULL, ksi.ksi_signo, &ksi);
1845 * Send a signal to a process group.
1854 sx_slock(&proctree_lock);
1855 pgrp = pgfind(pgid);
1856 sx_sunlock(&proctree_lock);
1858 pgsignal(pgrp, sig, 0);
1865 * Send a signal to a process group. If checktty is 1,
1866 * limit to members which have a controlling terminal.
1869 pgsignal(pgrp, sig, checkctty)
1873 register struct proc *p;
1876 PGRP_LOCK_ASSERT(pgrp, MA_OWNED);
1877 LIST_FOREACH(p, &pgrp->pg_members, p_pglist) {
1879 if (checkctty == 0 || p->p_flag & P_CONTROLT)
1887 * Send a signal caused by a trap to the current thread.
1888 * If it will be caught immediately, deliver it with correct code.
1889 * Otherwise, post it normally.
1894 trapsignal(struct thread *td, ksiginfo_t *ksi)
1903 sig = ksi->ksi_signo;
1904 code = ksi->ksi_code;
1905 KASSERT(_SIG_VALID(sig), ("invalid signal"));
1907 if (td->td_pflags & TDP_SA) {
1908 if (td->td_mailbox == NULL)
1909 thread_user_enter(td);
1911 SIGDELSET(td->td_sigmask, sig);
1912 mtx_lock_spin(&sched_lock);
1914 * Force scheduling an upcall, so UTS has chance to
1915 * process the signal before thread runs again in
1919 td->td_upcall->ku_flags |= KUF_DOUPCALL;
1920 mtx_unlock_spin(&sched_lock);
1925 mtx_lock(&ps->ps_mtx);
1926 if ((p->p_flag & P_TRACED) == 0 && SIGISMEMBER(ps->ps_sigcatch, sig) &&
1927 !SIGISMEMBER(td->td_sigmask, sig)) {
1928 p->p_stats->p_ru.ru_nsignals++;
1930 if (KTRPOINT(curthread, KTR_PSIG))
1931 ktrpsig(sig, ps->ps_sigact[_SIG_IDX(sig)],
1932 &td->td_sigmask, code);
1934 if (!(td->td_pflags & TDP_SA))
1935 (*p->p_sysent->sv_sendsig)(ps->ps_sigact[_SIG_IDX(sig)],
1936 ksi, &td->td_sigmask);
1937 else if (td->td_mailbox == NULL) {
1938 mtx_unlock(&ps->ps_mtx);
1939 /* UTS caused a sync signal */
1940 p->p_code = code; /* XXX for core dump/debugger */
1941 p->p_sig = sig; /* XXX to verify code */
1944 mtx_unlock(&ps->ps_mtx);
1945 SIGADDSET(td->td_sigmask, sig);
1947 error = copyout(&ksi->ksi_info, &td->td_mailbox->tm_syncsig,
1950 /* UTS memory corrupted */
1952 sigexit(td, SIGSEGV);
1953 mtx_lock(&ps->ps_mtx);
1955 SIGSETOR(td->td_sigmask, ps->ps_catchmask[_SIG_IDX(sig)]);
1956 if (!SIGISMEMBER(ps->ps_signodefer, sig))
1957 SIGADDSET(td->td_sigmask, sig);
1958 if (SIGISMEMBER(ps->ps_sigreset, sig)) {
1960 * See kern_sigaction() for origin of this code.
1962 SIGDELSET(ps->ps_sigcatch, sig);
1963 if (sig != SIGCONT &&
1964 sigprop(sig) & SA_IGNORE)
1965 SIGADDSET(ps->ps_sigignore, sig);
1966 ps->ps_sigact[_SIG_IDX(sig)] = SIG_DFL;
1968 mtx_unlock(&ps->ps_mtx);
1971 * Avoid a possible infinite loop if the thread
1972 * masking the signal or process is ignoring the
1975 if (kern_forcesigexit &&
1976 (SIGISMEMBER(td->td_sigmask, sig) ||
1977 ps->ps_sigact[_SIG_IDX(sig)] == SIG_IGN)) {
1978 SIGDELSET(td->td_sigmask, sig);
1979 SIGDELSET(ps->ps_sigcatch, sig);
1980 SIGDELSET(ps->ps_sigignore, sig);
1981 ps->ps_sigact[_SIG_IDX(sig)] = SIG_DFL;
1983 mtx_unlock(&ps->ps_mtx);
1984 p->p_code = code; /* XXX for core dump/debugger */
1985 p->p_sig = sig; /* XXX to verify code */
1986 tdsignal(p, td, sig, ksi);
1991 static struct thread *
1992 sigtd(struct proc *p, int sig, int prop)
1994 struct thread *td, *signal_td;
1996 PROC_LOCK_ASSERT(p, MA_OWNED);
1999 * Check if current thread can handle the signal without
2000 * switching conetxt to another thread.
2002 if (curproc == p && !SIGISMEMBER(curthread->td_sigmask, sig))
2005 mtx_lock_spin(&sched_lock);
2006 FOREACH_THREAD_IN_PROC(p, td) {
2007 if (!SIGISMEMBER(td->td_sigmask, sig)) {
2012 if (signal_td == NULL)
2013 signal_td = FIRST_THREAD_IN_PROC(p);
2014 mtx_unlock_spin(&sched_lock);
2019 * Send the signal to the process. If the signal has an action, the action
2020 * is usually performed by the target process rather than the caller; we add
2021 * the signal to the set of pending signals for the process.
2024 * o When a stop signal is sent to a sleeping process that takes the
2025 * default action, the process is stopped without awakening it.
2026 * o SIGCONT restarts stopped processes (or puts them back to sleep)
2027 * regardless of the signal action (eg, blocked or ignored).
2029 * Other ignored signals are discarded immediately.
2034 psignal(struct proc *p, int sig)
2036 (void) tdsignal(p, NULL, sig, NULL);
2040 psignal_event(struct proc *p, struct sigevent *sigev, ksiginfo_t *ksi)
2042 struct thread *td = NULL;
2044 PROC_LOCK_ASSERT(p, MA_OWNED);
2046 KASSERT(!KSI_ONQ(ksi), ("psignal_event: ksi on queue"));
2049 * ksi_code and other fields should be set before
2050 * calling this function.
2052 ksi->ksi_signo = sigev->sigev_signo;
2053 ksi->ksi_value = sigev->sigev_value;
2054 if (sigev->sigev_notify == SIGEV_THREAD_ID) {
2055 td = thread_find(p, sigev->sigev_notify_thread_id);
2059 return (tdsignal(p, td, ksi->ksi_signo, ksi));
2066 tdsignal(struct proc *p, struct thread *td, int sig, ksiginfo_t *ksi)
2071 if (p->p_flag & P_SA)
2072 saved = p->p_sigqueue.sq_signals;
2073 ret = do_tdsignal(p, td, sig, ksi);
2074 if ((p->p_flag & P_SA) && !(p->p_flag & P_SIGEVENT)) {
2075 if (!SIGSETEQ(saved, p->p_sigqueue.sq_signals)) {
2076 /* pending set changed */
2077 p->p_flag |= P_SIGEVENT;
2078 wakeup(&p->p_siglist);
2085 do_tdsignal(struct proc *p, struct thread *td, int sig, ksiginfo_t *ksi)
2088 sigqueue_t *sigqueue;
2094 PROC_LOCK_ASSERT(p, MA_OWNED);
2096 if (!_SIG_VALID(sig))
2097 panic("do_tdsignal(): invalid signal");
2099 KASSERT(ksi == NULL || !KSI_ONQ(ksi), ("do_tdsignal: ksi on queue"));
2102 * IEEE Std 1003.1-2001: return success when killing a zombie.
2104 if (p->p_state == PRS_ZOMBIE) {
2105 if (ksi && (ksi->ksi_flags & KSI_INS))
2106 ksiginfo_tryfree(ksi);
2111 KNOTE_LOCKED(&p->p_klist, NOTE_SIGNAL | sig);
2112 prop = sigprop(sig);
2115 * If the signal is blocked and not destined for this thread, then
2116 * assign it to the process so that we can find it later in the first
2117 * thread that unblocks it. Otherwise, assign it to this thread now.
2120 td = sigtd(p, sig, prop);
2121 if (SIGISMEMBER(td->td_sigmask, sig))
2122 sigqueue = &p->p_sigqueue;
2124 sigqueue = &td->td_sigqueue;
2126 KASSERT(td->td_proc == p, ("invalid thread"));
2127 sigqueue = &td->td_sigqueue;
2131 * If the signal is being ignored,
2132 * or process is exiting or thread is exiting,
2133 * then we forget about it immediately.
2134 * (Note: we don't set SIGCONT in ps_sigignore,
2135 * and if it is set to SIG_IGN,
2136 * action will be SIG_DFL here.)
2138 mtx_lock(&ps->ps_mtx);
2139 if (SIGISMEMBER(ps->ps_sigignore, sig) ||
2140 (p->p_flag & P_WEXIT)) {
2141 mtx_unlock(&ps->ps_mtx);
2142 if (ksi && (ksi->ksi_flags & KSI_INS))
2143 ksiginfo_tryfree(ksi);
2146 if (SIGISMEMBER(td->td_sigmask, sig))
2148 else if (SIGISMEMBER(ps->ps_sigcatch, sig))
2152 if (SIGISMEMBER(ps->ps_sigintr, sig))
2156 mtx_unlock(&ps->ps_mtx);
2159 sigqueue_delete_stopmask_proc(p);
2160 else if (prop & SA_STOP) {
2162 * If sending a tty stop signal to a member of an orphaned
2163 * process group, discard the signal here if the action
2164 * is default; don't stop the process below if sleeping,
2165 * and don't clear any pending SIGCONT.
2167 if ((prop & SA_TTYSTOP) &&
2168 (p->p_pgrp->pg_jobc == 0) &&
2169 (action == SIG_DFL)) {
2170 if (ksi && (ksi->ksi_flags & KSI_INS))
2171 ksiginfo_tryfree(ksi);
2174 sigqueue_delete_proc(p, SIGCONT);
2175 if (p->p_flag & P_CONTINUED) {
2176 p->p_flag &= ~P_CONTINUED;
2177 PROC_LOCK(p->p_pptr);
2178 sigqueue_take(p->p_ksi);
2179 PROC_UNLOCK(p->p_pptr);
2183 ret = sigqueue_add(sigqueue, sig, ksi);
2188 * Defer further processing for signals which are held,
2189 * except that stopped processes must be continued by SIGCONT.
2191 if (action == SIG_HOLD &&
2192 !((prop & SA_CONT) && (p->p_flag & P_STOPPED_SIG)))
2195 * SIGKILL: Remove procfs STOPEVENTs.
2197 if (sig == SIGKILL) {
2198 /* from procfs_ioctl.c: PIOCBIC */
2200 /* from procfs_ioctl.c: PIOCCONT */
2205 * Some signals have a process-wide effect and a per-thread
2206 * component. Most processing occurs when the process next
2207 * tries to cross the user boundary, however there are some
2208 * times when processing needs to be done immediatly, such as
2209 * waking up threads so that they can cross the user boundary.
2210 * We try do the per-process part here.
2212 if (P_SHOULDSTOP(p)) {
2214 * The process is in stopped mode. All the threads should be
2215 * either winding down or already on the suspended queue.
2217 if (p->p_flag & P_TRACED) {
2219 * The traced process is already stopped,
2220 * so no further action is necessary.
2221 * No signal can restart us.
2226 if (sig == SIGKILL) {
2228 * SIGKILL sets process running.
2229 * It will die elsewhere.
2230 * All threads must be restarted.
2232 p->p_flag &= ~P_STOPPED_SIG;
2236 if (prop & SA_CONT) {
2238 * If SIGCONT is default (or ignored), we continue the
2239 * process but don't leave the signal in sigqueue as
2240 * it has no further action. If SIGCONT is held, we
2241 * continue the process and leave the signal in
2242 * sigqueue. If the process catches SIGCONT, let it
2243 * handle the signal itself. If it isn't waiting on
2244 * an event, it goes back to run state.
2245 * Otherwise, process goes back to sleep state.
2247 p->p_flag &= ~P_STOPPED_SIG;
2248 if (p->p_numthreads == p->p_suspcount) {
2249 p->p_flag |= P_CONTINUED;
2250 p->p_xstat = SIGCONT;
2251 PROC_LOCK(p->p_pptr);
2252 childproc_continued(p);
2253 PROC_UNLOCK(p->p_pptr);
2255 if (action == SIG_DFL) {
2256 sigqueue_delete(sigqueue, sig);
2257 } else if (action == SIG_CATCH) {
2259 * The process wants to catch it so it needs
2260 * to run at least one thread, but which one?
2261 * It would seem that the answer would be to
2262 * run an upcall in the next KSE to run, and
2263 * deliver the signal that way. In a NON KSE
2264 * process, we need to make sure that the
2265 * single thread is runnable asap.
2266 * XXXKSE for now however, make them all run.
2271 * The signal is not ignored or caught.
2273 mtx_lock_spin(&sched_lock);
2274 thread_unsuspend(p);
2275 mtx_unlock_spin(&sched_lock);
2279 if (prop & SA_STOP) {
2281 * Already stopped, don't need to stop again
2282 * (If we did the shell could get confused).
2283 * Just make sure the signal STOP bit set.
2285 p->p_flag |= P_STOPPED_SIG;
2286 sigqueue_delete(sigqueue, sig);
2291 * All other kinds of signals:
2292 * If a thread is sleeping interruptibly, simulate a
2293 * wakeup so that when it is continued it will be made
2294 * runnable and can look at the signal. However, don't make
2295 * the PROCESS runnable, leave it stopped.
2296 * It may run a bit until it hits a thread_suspend_check().
2298 mtx_lock_spin(&sched_lock);
2299 if (TD_ON_SLEEPQ(td) && (td->td_flags & TDF_SINTR))
2300 sleepq_abort(td, intrval);
2301 mtx_unlock_spin(&sched_lock);
2304 * Mutexes are short lived. Threads waiting on them will
2305 * hit thread_suspend_check() soon.
2307 } else if (p->p_state == PRS_NORMAL) {
2308 if (p->p_flag & P_TRACED || action == SIG_CATCH) {
2309 mtx_lock_spin(&sched_lock);
2310 tdsigwakeup(td, sig, action, intrval);
2311 mtx_unlock_spin(&sched_lock);
2315 MPASS(action == SIG_DFL);
2317 if (prop & SA_STOP) {
2318 if (p->p_flag & P_PPWAIT)
2320 p->p_flag |= P_STOPPED_SIG;
2322 mtx_lock_spin(&sched_lock);
2323 sig_suspend_threads(td, p, 1);
2324 if (p->p_numthreads == p->p_suspcount) {
2326 * only thread sending signal to another
2327 * process can reach here, if thread is sending
2328 * signal to its process, because thread does
2329 * not suspend itself here, p_numthreads
2330 * should never be equal to p_suspcount.
2333 mtx_unlock_spin(&sched_lock);
2334 sigqueue_delete_proc(p, p->p_xstat);
2336 mtx_unlock_spin(&sched_lock);
2343 /* Not in "NORMAL" state. discard the signal. */
2344 sigqueue_delete(sigqueue, sig);
2349 * The process is not stopped so we need to apply the signal to all the
2354 mtx_lock_spin(&sched_lock);
2355 tdsigwakeup(td, sig, action, intrval);
2356 thread_unsuspend(p);
2357 mtx_unlock_spin(&sched_lock);
2359 /* If we jump here, sched_lock should not be owned. */
2360 mtx_assert(&sched_lock, MA_NOTOWNED);
2365 * The force of a signal has been directed against a single
2366 * thread. We need to see what we can do about knocking it
2367 * out of any sleep it may be in etc.
2370 tdsigwakeup(struct thread *td, int sig, sig_t action, int intrval)
2372 struct proc *p = td->td_proc;
2375 PROC_LOCK_ASSERT(p, MA_OWNED);
2376 mtx_assert(&sched_lock, MA_OWNED);
2377 prop = sigprop(sig);
2380 * Bring the priority of a thread up if we want it to get
2381 * killed in this lifetime.
2383 if (action == SIG_DFL && (prop & SA_KILL)) {
2385 sched_nice(td->td_proc, 0);
2386 if (td->td_priority > PUSER)
2387 sched_prio(td, PUSER);
2390 if (TD_ON_SLEEPQ(td)) {
2392 * If thread is sleeping uninterruptibly
2393 * we can't interrupt the sleep... the signal will
2394 * be noticed when the process returns through
2395 * trap() or syscall().
2397 if ((td->td_flags & TDF_SINTR) == 0)
2400 * If SIGCONT is default (or ignored) and process is
2401 * asleep, we are finished; the process should not
2404 if ((prop & SA_CONT) && action == SIG_DFL) {
2405 mtx_unlock_spin(&sched_lock);
2406 sigqueue_delete(&p->p_sigqueue, sig);
2408 * It may be on either list in this state.
2409 * Remove from both for now.
2411 sigqueue_delete(&td->td_sigqueue, sig);
2412 mtx_lock_spin(&sched_lock);
2417 * Give low priority threads a better chance to run.
2419 if (td->td_priority > PUSER)
2420 sched_prio(td, PUSER);
2422 sleepq_abort(td, intrval);
2425 * Other states do nothing with the signal immediately,
2426 * other than kicking ourselves if we are running.
2427 * It will either never be noticed, or noticed very soon.
2430 if (TD_IS_RUNNING(td) && td != curthread)
2437 sig_suspend_threads(struct thread *td, struct proc *p, int sending)
2441 PROC_LOCK_ASSERT(p, MA_OWNED);
2442 mtx_assert(&sched_lock, MA_OWNED);
2444 FOREACH_THREAD_IN_PROC(p, td2) {
2445 if ((TD_IS_SLEEPING(td2) || TD_IS_SWAPPED(td2)) &&
2446 (td2->td_flags & TDF_SINTR) &&
2447 !TD_IS_SUSPENDED(td2)) {
2448 thread_suspend_one(td2);
2450 if (sending || td != td2)
2451 td2->td_flags |= TDF_ASTPENDING;
2453 if (TD_IS_RUNNING(td2) && td2 != td)
2454 forward_signal(td2);
2461 ptracestop(struct thread *td, int sig)
2463 struct proc *p = td->td_proc;
2465 PROC_LOCK_ASSERT(p, MA_OWNED);
2466 WITNESS_WARN(WARN_GIANTOK | WARN_SLEEPOK,
2467 &p->p_mtx.mtx_object, "Stopping for traced signal");
2469 mtx_lock_spin(&sched_lock);
2470 td->td_flags |= TDF_XSIG;
2471 mtx_unlock_spin(&sched_lock);
2473 while ((p->p_flag & P_TRACED) && (td->td_flags & TDF_XSIG)) {
2474 if (p->p_flag & P_SINGLE_EXIT) {
2475 mtx_lock_spin(&sched_lock);
2476 td->td_flags &= ~TDF_XSIG;
2477 mtx_unlock_spin(&sched_lock);
2481 * Just make wait() to work, the last stopped thread
2486 p->p_flag |= (P_STOPPED_SIG|P_STOPPED_TRACE);
2487 mtx_lock_spin(&sched_lock);
2488 sig_suspend_threads(td, p, 0);
2491 thread_suspend_one(td);
2494 mi_switch(SW_VOL, NULL);
2495 mtx_unlock_spin(&sched_lock);
2498 if (!(p->p_flag & P_TRACED))
2500 if (td->td_flags & TDF_DBSUSPEND) {
2501 if (p->p_flag & P_SINGLE_EXIT)
2503 mtx_lock_spin(&sched_lock);
2507 return (td->td_xsig);
2511 * If the current process has received a signal (should be caught or cause
2512 * termination, should interrupt current syscall), return the signal number.
2513 * Stop signals with default action are processed immediately, then cleared;
2514 * they aren't returned. This is checked after each entry to the system for
2515 * a syscall or trap (though this can usually be done without calling issignal
2516 * by checking the pending signal masks in cursig.) The normal call
2519 * while (sig = cursig(curthread))
2528 sigset_t sigpending;
2529 int sig, prop, newsig;
2533 mtx_assert(&ps->ps_mtx, MA_OWNED);
2534 PROC_LOCK_ASSERT(p, MA_OWNED);
2536 int traced = (p->p_flag & P_TRACED) || (p->p_stops & S_SIG);
2538 sigpending = td->td_sigqueue.sq_signals;
2539 SIGSETNAND(sigpending, td->td_sigmask);
2541 if (p->p_flag & P_PPWAIT)
2542 SIG_STOPSIGMASK(sigpending);
2543 if (SIGISEMPTY(sigpending)) /* no signal to send */
2545 sig = sig_ffs(&sigpending);
2547 if (p->p_stops & S_SIG) {
2548 mtx_unlock(&ps->ps_mtx);
2549 stopevent(p, S_SIG, sig);
2550 mtx_lock(&ps->ps_mtx);
2554 * We should see pending but ignored signals
2555 * only if P_TRACED was on when they were posted.
2557 if (SIGISMEMBER(ps->ps_sigignore, sig) && (traced == 0)) {
2558 sigqueue_delete(&td->td_sigqueue, sig);
2559 if (td->td_pflags & TDP_SA)
2560 SIGADDSET(td->td_sigmask, sig);
2563 if (p->p_flag & P_TRACED && (p->p_flag & P_PPWAIT) == 0) {
2565 * If traced, always stop.
2567 mtx_unlock(&ps->ps_mtx);
2568 newsig = ptracestop(td, sig);
2569 mtx_lock(&ps->ps_mtx);
2571 if (td->td_pflags & TDP_SA)
2572 SIGADDSET(td->td_sigmask, sig);
2574 if (sig != newsig) {
2578 * XXX shrug off debugger, it causes siginfo to
2581 sigqueue_get(&td->td_sigqueue, sig, &ksi);
2584 * If parent wants us to take the signal,
2585 * then it will leave it in p->p_xstat;
2586 * otherwise we just look for signals again.
2593 * Put the new signal into td_sigqueue. If the
2594 * signal is being masked, look for other signals.
2596 SIGADDSET(td->td_sigqueue.sq_signals, sig);
2597 if (td->td_pflags & TDP_SA)
2598 SIGDELSET(td->td_sigmask, sig);
2599 if (SIGISMEMBER(td->td_sigmask, sig))
2605 * If the traced bit got turned off, go back up
2606 * to the top to rescan signals. This ensures
2607 * that p_sig* and p_sigact are consistent.
2609 if ((p->p_flag & P_TRACED) == 0)
2613 prop = sigprop(sig);
2616 * Decide whether the signal should be returned.
2617 * Return the signal's number, or fall through
2618 * to clear it from the pending mask.
2620 switch ((intptr_t)p->p_sigacts->ps_sigact[_SIG_IDX(sig)]) {
2622 case (intptr_t)SIG_DFL:
2624 * Don't take default actions on system processes.
2626 if (p->p_pid <= 1) {
2629 * Are you sure you want to ignore SIGSEGV
2632 printf("Process (pid %lu) got signal %d\n",
2633 (u_long)p->p_pid, sig);
2635 break; /* == ignore */
2638 * If there is a pending stop signal to process
2639 * with default action, stop here,
2640 * then clear the signal. However,
2641 * if process is member of an orphaned
2642 * process group, ignore tty stop signals.
2644 if (prop & SA_STOP) {
2645 if (p->p_flag & P_TRACED ||
2646 (p->p_pgrp->pg_jobc == 0 &&
2648 break; /* == ignore */
2649 mtx_unlock(&ps->ps_mtx);
2650 WITNESS_WARN(WARN_GIANTOK | WARN_SLEEPOK,
2651 &p->p_mtx.mtx_object, "Catching SIGSTOP");
2652 p->p_flag |= P_STOPPED_SIG;
2654 mtx_lock_spin(&sched_lock);
2655 sig_suspend_threads(td, p, 0);
2657 thread_suspend_one(td);
2660 mi_switch(SW_INVOL, NULL);
2661 mtx_unlock_spin(&sched_lock);
2664 mtx_lock(&ps->ps_mtx);
2666 } else if (prop & SA_IGNORE) {
2668 * Except for SIGCONT, shouldn't get here.
2669 * Default action is to ignore; drop it.
2671 break; /* == ignore */
2676 case (intptr_t)SIG_IGN:
2678 * Masking above should prevent us ever trying
2679 * to take action on an ignored signal other
2680 * than SIGCONT, unless process is traced.
2682 if ((prop & SA_CONT) == 0 &&
2683 (p->p_flag & P_TRACED) == 0)
2684 printf("issignal\n");
2685 break; /* == ignore */
2689 * This signal has an action, let
2690 * postsig() process it.
2694 sigqueue_delete(&td->td_sigqueue, sig); /* take the signal! */
2703 thread_stopped(struct proc *p)
2707 PROC_LOCK_ASSERT(p, MA_OWNED);
2708 mtx_assert(&sched_lock, MA_OWNED);
2712 if ((p->p_flag & P_STOPPED_SIG) && (n == p->p_numthreads)) {
2713 mtx_unlock_spin(&sched_lock);
2714 p->p_flag &= ~P_WAITED;
2715 PROC_LOCK(p->p_pptr);
2716 childproc_stopped(p, (p->p_flag & P_TRACED) ?
2717 CLD_TRAPPED : CLD_STOPPED);
2718 PROC_UNLOCK(p->p_pptr);
2719 mtx_lock_spin(&sched_lock);
2724 * Take the action for the specified signal
2725 * from the current set of pending signals.
2731 struct thread *td = curthread;
2732 register struct proc *p = td->td_proc;
2736 sigset_t returnmask;
2739 KASSERT(sig != 0, ("postsig"));
2741 PROC_LOCK_ASSERT(p, MA_OWNED);
2743 mtx_assert(&ps->ps_mtx, MA_OWNED);
2744 ksiginfo_init(&ksi);
2745 sigqueue_get(&td->td_sigqueue, sig, &ksi);
2746 ksi.ksi_signo = sig;
2747 if (ksi.ksi_code == SI_TIMER)
2748 itimer_accept(p, ksi.ksi_timerid, &ksi);
2749 action = ps->ps_sigact[_SIG_IDX(sig)];
2751 if (KTRPOINT(td, KTR_PSIG))
2752 ktrpsig(sig, action, td->td_pflags & TDP_OLDMASK ?
2753 &td->td_oldsigmask : &td->td_sigmask, 0);
2755 if (p->p_stops & S_SIG) {
2756 mtx_unlock(&ps->ps_mtx);
2757 stopevent(p, S_SIG, sig);
2758 mtx_lock(&ps->ps_mtx);
2761 if (!(td->td_pflags & TDP_SA) && action == SIG_DFL) {
2763 * Default action, where the default is to kill
2764 * the process. (Other cases were ignored above.)
2766 mtx_unlock(&ps->ps_mtx);
2770 if (td->td_pflags & TDP_SA) {
2771 if (sig == SIGKILL) {
2772 mtx_unlock(&ps->ps_mtx);
2778 * If we get here, the signal must be caught.
2780 KASSERT(action != SIG_IGN && !SIGISMEMBER(td->td_sigmask, sig),
2781 ("postsig action"));
2783 * Set the new mask value and also defer further
2784 * occurrences of this signal.
2786 * Special case: user has done a sigsuspend. Here the
2787 * current mask is not of interest, but rather the
2788 * mask from before the sigsuspend is what we want
2789 * restored after the signal processing is completed.
2791 if (td->td_pflags & TDP_OLDMASK) {
2792 returnmask = td->td_oldsigmask;
2793 td->td_pflags &= ~TDP_OLDMASK;
2795 returnmask = td->td_sigmask;
2797 SIGSETOR(td->td_sigmask, ps->ps_catchmask[_SIG_IDX(sig)]);
2798 if (!SIGISMEMBER(ps->ps_signodefer, sig))
2799 SIGADDSET(td->td_sigmask, sig);
2801 if (SIGISMEMBER(ps->ps_sigreset, sig)) {
2803 * See kern_sigaction() for origin of this code.
2805 SIGDELSET(ps->ps_sigcatch, sig);
2806 if (sig != SIGCONT &&
2807 sigprop(sig) & SA_IGNORE)
2808 SIGADDSET(ps->ps_sigignore, sig);
2809 ps->ps_sigact[_SIG_IDX(sig)] = SIG_DFL;
2811 p->p_stats->p_ru.ru_nsignals++;
2812 if (p->p_sig != sig) {
2819 if (td->td_pflags & TDP_SA)
2820 thread_signal_add(curthread, &ksi);
2822 (*p->p_sysent->sv_sendsig)(action, &ksi, &returnmask);
2827 * Kill the current process for stated reason.
2835 PROC_LOCK_ASSERT(p, MA_OWNED);
2836 CTR3(KTR_PROC, "killproc: proc %p (pid %d, %s)",
2837 p, p->p_pid, p->p_comm);
2838 log(LOG_ERR, "pid %d (%s), uid %d, was killed: %s\n", p->p_pid, p->p_comm,
2839 p->p_ucred ? p->p_ucred->cr_uid : -1, why);
2840 psignal(p, SIGKILL);
2844 * Force the current process to exit with the specified signal, dumping core
2845 * if appropriate. We bypass the normal tests for masked and caught signals,
2846 * allowing unrecoverable failures to terminate the process without changing
2847 * signal state. Mark the accounting record with the signal termination.
2848 * If dumping core, save the signal number for the debugger. Calls exit and
2858 struct proc *p = td->td_proc;
2860 PROC_LOCK_ASSERT(p, MA_OWNED);
2861 p->p_acflag |= AXSIG;
2863 * We must be single-threading to generate a core dump. This
2864 * ensures that the registers in the core file are up-to-date.
2865 * Also, the ELF dump handler assumes that the thread list doesn't
2866 * change out from under it.
2868 * XXX If another thread attempts to single-thread before us
2869 * (e.g. via fork()), we won't get a dump at all.
2871 if ((sigprop(sig) & SA_CORE) && (thread_single(SINGLE_NO_EXIT) == 0)) {
2874 * Log signals which would cause core dumps
2875 * (Log as LOG_INFO to appease those who don't want
2877 * XXX : Todo, as well as euid, write out ruid too
2878 * Note that coredump() drops proc lock.
2880 if (coredump(td) == 0)
2882 if (kern_logsigexit)
2884 "pid %d (%s), uid %d: exited on signal %d%s\n",
2885 p->p_pid, p->p_comm,
2886 td->td_ucred ? td->td_ucred->cr_uid : -1,
2888 sig & WCOREFLAG ? " (core dumped)" : "");
2891 exit1(td, W_EXITCODE(0, sig));
2896 * Send queued SIGCHLD to parent when child process's state
2900 sigparent(struct proc *p, int reason, int status)
2902 PROC_LOCK_ASSERT(p, MA_OWNED);
2903 PROC_LOCK_ASSERT(p->p_pptr, MA_OWNED);
2905 if (p->p_ksi != NULL) {
2906 p->p_ksi->ksi_signo = SIGCHLD;
2907 p->p_ksi->ksi_code = reason;
2908 p->p_ksi->ksi_status = status;
2909 p->p_ksi->ksi_pid = p->p_pid;
2910 p->p_ksi->ksi_uid = p->p_ucred->cr_ruid;
2911 if (KSI_ONQ(p->p_ksi))
2914 tdsignal(p->p_pptr, NULL, SIGCHLD, p->p_ksi);
2918 childproc_jobstate(struct proc *p, int reason, int status)
2922 PROC_LOCK_ASSERT(p, MA_OWNED);
2923 PROC_LOCK_ASSERT(p->p_pptr, MA_OWNED);
2926 * Wake up parent sleeping in kern_wait(), also send
2927 * SIGCHLD to parent, but SIGCHLD does not guarantee
2928 * that parent will awake, because parent may masked
2931 p->p_pptr->p_flag |= P_STATCHILD;
2934 ps = p->p_pptr->p_sigacts;
2935 mtx_lock(&ps->ps_mtx);
2936 if ((ps->ps_flag & PS_NOCLDSTOP) == 0) {
2937 mtx_unlock(&ps->ps_mtx);
2938 sigparent(p, reason, status);
2940 mtx_unlock(&ps->ps_mtx);
2944 childproc_stopped(struct proc *p, int reason)
2946 childproc_jobstate(p, reason, p->p_xstat);
2950 childproc_continued(struct proc *p)
2952 childproc_jobstate(p, CLD_CONTINUED, SIGCONT);
2956 childproc_exited(struct proc *p)
2959 int status = p->p_xstat; /* convert to int */
2961 reason = CLD_EXITED;
2962 if (WCOREDUMP(status))
2963 reason = CLD_DUMPED;
2964 else if (WIFSIGNALED(status))
2965 reason = CLD_KILLED;
2967 * XXX avoid calling wakeup(p->p_pptr), the work is
2970 sigparent(p, reason, status);
2973 static char corefilename[MAXPATHLEN] = {"%N.core"};
2974 SYSCTL_STRING(_kern, OID_AUTO, corefile, CTLFLAG_RW, corefilename,
2975 sizeof(corefilename), "process corefile name format string");
2978 * expand_name(name, uid, pid)
2979 * Expand the name described in corefilename, using name, uid, and pid.
2980 * corefilename is a printf-like string, with three format specifiers:
2981 * %N name of process ("name")
2982 * %P process id (pid)
2984 * For example, "%N.core" is the default; they can be disabled completely
2985 * by using "/dev/null", or all core files can be stored in "/cores/%U/%N-%P".
2986 * This is controlled by the sysctl variable kern.corefile (see above).
2990 expand_name(name, uid, pid)
2995 const char *format, *appendstr;
2997 char buf[11]; /* Buffer for pid/uid -- max 4B */
3000 format = corefilename;
3001 temp = malloc(MAXPATHLEN, M_TEMP, M_NOWAIT | M_ZERO);
3004 for (i = 0, n = 0; n < MAXPATHLEN && format[i]; i++) {
3005 switch (format[i]) {
3006 case '%': /* Format character */
3008 switch (format[i]) {
3012 case 'N': /* process name */
3015 case 'P': /* process id */
3016 sprintf(buf, "%u", pid);
3019 case 'U': /* user id */
3020 sprintf(buf, "%u", uid);
3026 "Unknown format character %c in `%s'\n",
3029 l = strlen(appendstr);
3030 if ((n + l) >= MAXPATHLEN)
3032 memcpy(temp + n, appendstr, l);
3036 temp[n++] = format[i];
3039 if (format[i] != '\0')
3043 log(LOG_ERR, "pid %ld (%s), uid (%lu): corename is too long\n",
3044 (long)pid, name, (u_long)uid);
3050 * Dump a process' core. The main routine does some
3051 * policy checking, and creates the name of the coredump;
3052 * then it passes on a vnode and a size limit to the process-specific
3053 * coredump routine if there is one; if there _is not_ one, it returns
3054 * ENOSYS; otherwise it returns the error from the process-specific routine.
3058 coredump(struct thread *td)
3060 struct proc *p = td->td_proc;
3061 register struct vnode *vp;
3062 register struct ucred *cred = td->td_ucred;
3064 struct nameidata nd;
3066 int error, error1, flags, locked;
3068 char *name; /* name of corefile */
3071 PROC_LOCK_ASSERT(p, MA_OWNED);
3072 MPASS((p->p_flag & P_HADTHREADS) == 0 || p->p_singlethread == td);
3073 _STOPEVENT(p, S_CORE, 0);
3075 if (((sugid_coredump == 0) && p->p_flag & P_SUGID) || do_coredump == 0) {
3081 * Note that the bulk of limit checking is done after
3082 * the corefile is created. The exception is if the limit
3083 * for corefiles is 0, in which case we don't bother
3084 * creating the corefile at all. This layout means that
3085 * a corefile is truncated instead of not being created,
3086 * if it is larger than the limit.
3088 limit = (off_t)lim_cur(p, RLIMIT_CORE);
3095 name = expand_name(p->p_comm, td->td_ucred->cr_uid, p->p_pid);
3100 NDINIT(&nd, LOOKUP, NOFOLLOW, UIO_SYSSPACE, name, td); /* XXXKSE */
3101 flags = O_CREAT | FWRITE | O_NOFOLLOW;
3102 error = vn_open(&nd, &flags, S_IRUSR | S_IWUSR, -1);
3108 NDFREE(&nd, NDF_ONLY_PNBUF);
3111 /* Don't dump to non-regular files or files with links. */
3112 if (vp->v_type != VREG ||
3113 VOP_GETATTR(vp, &vattr, cred, td) || vattr.va_nlink != 1) {
3114 VOP_UNLOCK(vp, 0, td);
3119 VOP_UNLOCK(vp, 0, td);
3120 lf.l_whence = SEEK_SET;
3123 lf.l_type = F_WRLCK;
3124 locked = (VOP_ADVLOCK(vp, (caddr_t)p, F_SETLK, &lf, F_FLOCK) == 0);
3126 if (vn_start_write(vp, &mp, V_NOWAIT) != 0) {
3127 lf.l_type = F_UNLCK;
3129 VOP_ADVLOCK(vp, (caddr_t)p, F_UNLCK, &lf, F_FLOCK);
3130 if ((error = vn_close(vp, FWRITE, cred, td)) != 0)
3132 if ((error = vn_start_write(NULL, &mp, V_XSLEEP | PCATCH)) != 0)
3139 if (set_core_nodump_flag)
3140 vattr.va_flags = UF_NODUMP;
3141 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, td);
3142 VOP_LEASE(vp, td, cred, LEASE_WRITE);
3143 VOP_SETATTR(vp, &vattr, cred, td);
3144 VOP_UNLOCK(vp, 0, td);
3146 p->p_acflag |= ACORE;
3149 error = p->p_sysent->sv_coredump ?
3150 p->p_sysent->sv_coredump(td, vp, limit) :
3154 lf.l_type = F_UNLCK;
3155 VOP_ADVLOCK(vp, (caddr_t)p, F_UNLCK, &lf, F_FLOCK);
3157 vn_finished_write(mp);
3159 error1 = vn_close(vp, FWRITE, cred, td);
3167 * Nonexistent system call-- signal process (may want to handle it).
3168 * Flag error in case process won't see signal immediately (blocked or ignored).
3170 #ifndef _SYS_SYSPROTO_H_
3182 struct nosys_args *args;
3184 struct proc *p = td->td_proc;
3193 * Send a SIGIO or SIGURG signal to a process or process group using
3194 * stored credentials rather than those of the current process.
3197 pgsigio(sigiop, sig, checkctty)
3198 struct sigio **sigiop;
3201 struct sigio *sigio;
3205 if (sigio == NULL) {
3209 if (sigio->sio_pgid > 0) {
3210 PROC_LOCK(sigio->sio_proc);
3211 if (CANSIGIO(sigio->sio_ucred, sigio->sio_proc->p_ucred))
3212 psignal(sigio->sio_proc, sig);
3213 PROC_UNLOCK(sigio->sio_proc);
3214 } else if (sigio->sio_pgid < 0) {
3217 PGRP_LOCK(sigio->sio_pgrp);
3218 LIST_FOREACH(p, &sigio->sio_pgrp->pg_members, p_pglist) {
3220 if (CANSIGIO(sigio->sio_ucred, p->p_ucred) &&
3221 (checkctty == 0 || (p->p_flag & P_CONTROLT)))
3225 PGRP_UNLOCK(sigio->sio_pgrp);
3231 filt_sigattach(struct knote *kn)
3233 struct proc *p = curproc;
3235 kn->kn_ptr.p_proc = p;
3236 kn->kn_flags |= EV_CLEAR; /* automatically set */
3238 knlist_add(&p->p_klist, kn, 0);
3244 filt_sigdetach(struct knote *kn)
3246 struct proc *p = kn->kn_ptr.p_proc;
3248 knlist_remove(&p->p_klist, kn, 0);
3252 * signal knotes are shared with proc knotes, so we apply a mask to
3253 * the hint in order to differentiate them from process hints. This
3254 * could be avoided by using a signal-specific knote list, but probably
3255 * isn't worth the trouble.
3258 filt_signal(struct knote *kn, long hint)
3261 if (hint & NOTE_SIGNAL) {
3262 hint &= ~NOTE_SIGNAL;
3264 if (kn->kn_id == hint)
3267 return (kn->kn_data != 0);
3275 ps = malloc(sizeof(struct sigacts), M_SUBPROC, M_WAITOK | M_ZERO);
3277 mtx_init(&ps->ps_mtx, "sigacts", NULL, MTX_DEF);
3282 sigacts_free(struct sigacts *ps)
3285 mtx_lock(&ps->ps_mtx);
3287 if (ps->ps_refcnt == 0) {
3288 mtx_destroy(&ps->ps_mtx);
3289 free(ps, M_SUBPROC);
3291 mtx_unlock(&ps->ps_mtx);
3295 sigacts_hold(struct sigacts *ps)
3297 mtx_lock(&ps->ps_mtx);
3299 mtx_unlock(&ps->ps_mtx);
3304 sigacts_copy(struct sigacts *dest, struct sigacts *src)
3307 KASSERT(dest->ps_refcnt == 1, ("sigacts_copy to shared dest"));
3308 mtx_lock(&src->ps_mtx);
3309 bcopy(src, dest, offsetof(struct sigacts, ps_refcnt));
3310 mtx_unlock(&src->ps_mtx);
3314 sigacts_shared(struct sigacts *ps)
3318 mtx_lock(&ps->ps_mtx);
3319 shared = ps->ps_refcnt > 1;
3320 mtx_unlock(&ps->ps_mtx);