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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18 * 4. Neither the name of the University nor the names of its contributors
19 * may be used to endorse or promote products derived from this software
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31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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_kdtrace.h"
42 #include "opt_ktrace.h"
44 #include "opt_procdesc.h"
46 #include <sys/param.h>
47 #include <sys/systm.h>
48 #include <sys/signalvar.h>
49 #include <sys/vnode.h>
51 #include <sys/capsicum.h>
52 #include <sys/condvar.h>
53 #include <sys/event.h>
54 #include <sys/fcntl.h>
55 #include <sys/imgact.h>
56 #include <sys/kernel.h>
58 #include <sys/ktrace.h>
60 #include <sys/malloc.h>
61 #include <sys/mutex.h>
62 #include <sys/refcount.h>
63 #include <sys/namei.h>
65 #include <sys/procdesc.h>
66 #include <sys/posix4.h>
67 #include <sys/pioctl.h>
68 #include <sys/racct.h>
69 #include <sys/resourcevar.h>
72 #include <sys/sleepqueue.h>
76 #include <sys/syscallsubr.h>
77 #include <sys/sysctl.h>
78 #include <sys/sysent.h>
79 #include <sys/syslog.h>
80 #include <sys/sysproto.h>
81 #include <sys/timers.h>
82 #include <sys/unistd.h>
85 #include <vm/vm_extern.h>
90 #include <machine/cpu.h>
92 #include <security/audit/audit.h>
94 #define ONSIG 32 /* NSIG for osig* syscalls. XXX. */
96 SDT_PROVIDER_DECLARE(proc);
97 SDT_PROBE_DEFINE3(proc, , , signal__send,
98 "struct thread *", "struct proc *", "int");
99 SDT_PROBE_DEFINE2(proc, , , signal__clear,
100 "int", "ksiginfo_t *");
101 SDT_PROBE_DEFINE3(proc, , , signal__discard,
102 "struct thread *", "struct proc *", "int");
104 static int coredump(struct thread *);
105 static int killpg1(struct thread *td, int sig, int pgid, int all,
107 static int issignal(struct thread *td);
108 static int sigprop(int sig);
109 static void tdsigwakeup(struct thread *, int, sig_t, int);
110 static void sig_suspend_threads(struct thread *, struct proc *, int);
111 static int filt_sigattach(struct knote *kn);
112 static void filt_sigdetach(struct knote *kn);
113 static int filt_signal(struct knote *kn, long hint);
114 static struct thread *sigtd(struct proc *p, int sig, int prop);
115 static void sigqueue_start(void);
117 static uma_zone_t ksiginfo_zone = NULL;
118 struct filterops sig_filtops = {
120 .f_attach = filt_sigattach,
121 .f_detach = filt_sigdetach,
122 .f_event = filt_signal,
125 static int kern_logsigexit = 1;
126 SYSCTL_INT(_kern, KERN_LOGSIGEXIT, logsigexit, CTLFLAG_RW,
128 "Log processes quitting on abnormal signals to syslog(3)");
130 static int kern_forcesigexit = 1;
131 SYSCTL_INT(_kern, OID_AUTO, forcesigexit, CTLFLAG_RW,
132 &kern_forcesigexit, 0, "Force trap signal to be handled");
134 static SYSCTL_NODE(_kern, OID_AUTO, sigqueue, CTLFLAG_RW, 0,
135 "POSIX real time signal");
137 static int max_pending_per_proc = 128;
138 SYSCTL_INT(_kern_sigqueue, OID_AUTO, max_pending_per_proc, CTLFLAG_RW,
139 &max_pending_per_proc, 0, "Max pending signals per proc");
141 static int preallocate_siginfo = 1024;
142 TUNABLE_INT("kern.sigqueue.preallocate", &preallocate_siginfo);
143 SYSCTL_INT(_kern_sigqueue, OID_AUTO, preallocate, CTLFLAG_RD,
144 &preallocate_siginfo, 0, "Preallocated signal memory size");
146 static int signal_overflow = 0;
147 SYSCTL_INT(_kern_sigqueue, OID_AUTO, overflow, CTLFLAG_RD,
148 &signal_overflow, 0, "Number of signals overflew");
150 static int signal_alloc_fail = 0;
151 SYSCTL_INT(_kern_sigqueue, OID_AUTO, alloc_fail, CTLFLAG_RD,
152 &signal_alloc_fail, 0, "signals failed to be allocated");
154 SYSINIT(signal, SI_SUB_P1003_1B, SI_ORDER_FIRST+3, sigqueue_start, NULL);
157 * Policy -- Can ucred cr1 send SIGIO to process cr2?
158 * Should use cr_cansignal() once cr_cansignal() allows SIGIO and SIGURG
159 * in the right situations.
161 #define CANSIGIO(cr1, cr2) \
162 ((cr1)->cr_uid == 0 || \
163 (cr1)->cr_ruid == (cr2)->cr_ruid || \
164 (cr1)->cr_uid == (cr2)->cr_ruid || \
165 (cr1)->cr_ruid == (cr2)->cr_uid || \
166 (cr1)->cr_uid == (cr2)->cr_uid)
168 static int sugid_coredump;
169 TUNABLE_INT("kern.sugid_coredump", &sugid_coredump);
170 SYSCTL_INT(_kern, OID_AUTO, sugid_coredump, CTLFLAG_RW,
171 &sugid_coredump, 0, "Allow setuid and setgid processes to dump core");
173 static int capmode_coredump;
174 TUNABLE_INT("kern.capmode_coredump", &capmode_coredump);
175 SYSCTL_INT(_kern, OID_AUTO, capmode_coredump, CTLFLAG_RW,
176 &capmode_coredump, 0, "Allow processes in capability mode to dump core");
178 static int do_coredump = 1;
179 SYSCTL_INT(_kern, OID_AUTO, coredump, CTLFLAG_RW,
180 &do_coredump, 0, "Enable/Disable coredumps");
182 static int set_core_nodump_flag = 0;
183 SYSCTL_INT(_kern, OID_AUTO, nodump_coredump, CTLFLAG_RW, &set_core_nodump_flag,
184 0, "Enable setting the NODUMP flag on coredump files");
187 * Signal properties and actions.
188 * The array below categorizes the signals and their default actions
189 * according to the following properties:
191 #define SA_KILL 0x01 /* terminates process by default */
192 #define SA_CORE 0x02 /* ditto and coredumps */
193 #define SA_STOP 0x04 /* suspend process */
194 #define SA_TTYSTOP 0x08 /* ditto, from tty */
195 #define SA_IGNORE 0x10 /* ignore by default */
196 #define SA_CONT 0x20 /* continue if suspended */
197 #define SA_CANTMASK 0x40 /* non-maskable, catchable */
199 static int sigproptbl[NSIG] = {
200 SA_KILL, /* SIGHUP */
201 SA_KILL, /* SIGINT */
202 SA_KILL|SA_CORE, /* SIGQUIT */
203 SA_KILL|SA_CORE, /* SIGILL */
204 SA_KILL|SA_CORE, /* SIGTRAP */
205 SA_KILL|SA_CORE, /* SIGABRT */
206 SA_KILL|SA_CORE, /* SIGEMT */
207 SA_KILL|SA_CORE, /* SIGFPE */
208 SA_KILL, /* SIGKILL */
209 SA_KILL|SA_CORE, /* SIGBUS */
210 SA_KILL|SA_CORE, /* SIGSEGV */
211 SA_KILL|SA_CORE, /* SIGSYS */
212 SA_KILL, /* SIGPIPE */
213 SA_KILL, /* SIGALRM */
214 SA_KILL, /* SIGTERM */
215 SA_IGNORE, /* SIGURG */
216 SA_STOP, /* SIGSTOP */
217 SA_STOP|SA_TTYSTOP, /* SIGTSTP */
218 SA_IGNORE|SA_CONT, /* SIGCONT */
219 SA_IGNORE, /* SIGCHLD */
220 SA_STOP|SA_TTYSTOP, /* SIGTTIN */
221 SA_STOP|SA_TTYSTOP, /* SIGTTOU */
222 SA_IGNORE, /* SIGIO */
223 SA_KILL, /* SIGXCPU */
224 SA_KILL, /* SIGXFSZ */
225 SA_KILL, /* SIGVTALRM */
226 SA_KILL, /* SIGPROF */
227 SA_IGNORE, /* SIGWINCH */
228 SA_IGNORE, /* SIGINFO */
229 SA_KILL, /* SIGUSR1 */
230 SA_KILL, /* SIGUSR2 */
233 static void reschedule_signals(struct proc *p, sigset_t block, int flags);
238 ksiginfo_zone = uma_zcreate("ksiginfo", sizeof(ksiginfo_t),
239 NULL, NULL, NULL, NULL, UMA_ALIGN_PTR, 0);
240 uma_prealloc(ksiginfo_zone, preallocate_siginfo);
241 p31b_setcfg(CTL_P1003_1B_REALTIME_SIGNALS, _POSIX_REALTIME_SIGNALS);
242 p31b_setcfg(CTL_P1003_1B_RTSIG_MAX, SIGRTMAX - SIGRTMIN + 1);
243 p31b_setcfg(CTL_P1003_1B_SIGQUEUE_MAX, max_pending_per_proc);
247 ksiginfo_alloc(int wait)
254 if (ksiginfo_zone != NULL)
255 return ((ksiginfo_t *)uma_zalloc(ksiginfo_zone, flags));
260 ksiginfo_free(ksiginfo_t *ksi)
262 uma_zfree(ksiginfo_zone, ksi);
266 ksiginfo_tryfree(ksiginfo_t *ksi)
268 if (!(ksi->ksi_flags & KSI_EXT)) {
269 uma_zfree(ksiginfo_zone, ksi);
276 sigqueue_init(sigqueue_t *list, struct proc *p)
278 SIGEMPTYSET(list->sq_signals);
279 SIGEMPTYSET(list->sq_kill);
280 SIGEMPTYSET(list->sq_ptrace);
281 TAILQ_INIT(&list->sq_list);
283 list->sq_flags = SQ_INIT;
287 * Get a signal's ksiginfo.
289 * 0 - signal not found
290 * others - signal number
293 sigqueue_get(sigqueue_t *sq, int signo, ksiginfo_t *si)
295 struct proc *p = sq->sq_proc;
296 struct ksiginfo *ksi, *next;
299 KASSERT(sq->sq_flags & SQ_INIT, ("sigqueue not inited"));
301 if (!SIGISMEMBER(sq->sq_signals, signo))
304 if (SIGISMEMBER(sq->sq_ptrace, signo)) {
306 SIGDELSET(sq->sq_ptrace, signo);
307 si->ksi_flags |= KSI_PTRACE;
309 if (SIGISMEMBER(sq->sq_kill, signo)) {
312 SIGDELSET(sq->sq_kill, signo);
315 TAILQ_FOREACH_SAFE(ksi, &sq->sq_list, ksi_link, next) {
316 if (ksi->ksi_signo == signo) {
318 TAILQ_REMOVE(&sq->sq_list, ksi, ksi_link);
319 ksi->ksi_sigq = NULL;
320 ksiginfo_copy(ksi, si);
321 if (ksiginfo_tryfree(ksi) && p != NULL)
330 SIGDELSET(sq->sq_signals, signo);
331 si->ksi_signo = signo;
336 sigqueue_take(ksiginfo_t *ksi)
342 if (ksi == NULL || (sq = ksi->ksi_sigq) == NULL)
346 TAILQ_REMOVE(&sq->sq_list, ksi, ksi_link);
347 ksi->ksi_sigq = NULL;
348 if (!(ksi->ksi_flags & KSI_EXT) && p != NULL)
351 for (kp = TAILQ_FIRST(&sq->sq_list); kp != NULL;
352 kp = TAILQ_NEXT(kp, ksi_link)) {
353 if (kp->ksi_signo == ksi->ksi_signo)
356 if (kp == NULL && !SIGISMEMBER(sq->sq_kill, ksi->ksi_signo) &&
357 !SIGISMEMBER(sq->sq_ptrace, ksi->ksi_signo))
358 SIGDELSET(sq->sq_signals, ksi->ksi_signo);
362 sigqueue_add(sigqueue_t *sq, int signo, ksiginfo_t *si)
364 struct proc *p = sq->sq_proc;
365 struct ksiginfo *ksi;
368 KASSERT(sq->sq_flags & SQ_INIT, ("sigqueue not inited"));
371 * SIGKILL/SIGSTOP cannot be caught or masked, so take the fast path
374 if (signo == SIGKILL || signo == SIGSTOP || si == NULL) {
375 SIGADDSET(sq->sq_kill, signo);
379 /* directly insert the ksi, don't copy it */
380 if (si->ksi_flags & KSI_INS) {
381 if (si->ksi_flags & KSI_HEAD)
382 TAILQ_INSERT_HEAD(&sq->sq_list, si, ksi_link);
384 TAILQ_INSERT_TAIL(&sq->sq_list, si, ksi_link);
389 if (__predict_false(ksiginfo_zone == NULL)) {
390 SIGADDSET(sq->sq_kill, signo);
394 if (p != NULL && p->p_pendingcnt >= max_pending_per_proc) {
397 } else if ((ksi = ksiginfo_alloc(0)) == NULL) {
403 ksiginfo_copy(si, ksi);
404 ksi->ksi_signo = signo;
405 if (si->ksi_flags & KSI_HEAD)
406 TAILQ_INSERT_HEAD(&sq->sq_list, ksi, ksi_link);
408 TAILQ_INSERT_TAIL(&sq->sq_list, ksi, ksi_link);
413 if ((si->ksi_flags & KSI_PTRACE) != 0) {
414 SIGADDSET(sq->sq_ptrace, signo);
417 } else if ((si->ksi_flags & KSI_TRAP) != 0 ||
418 (si->ksi_flags & KSI_SIGQ) == 0) {
419 SIGADDSET(sq->sq_kill, signo);
427 SIGADDSET(sq->sq_signals, signo);
432 sigqueue_flush(sigqueue_t *sq)
434 struct proc *p = sq->sq_proc;
437 KASSERT(sq->sq_flags & SQ_INIT, ("sigqueue not inited"));
440 PROC_LOCK_ASSERT(p, MA_OWNED);
442 while ((ksi = TAILQ_FIRST(&sq->sq_list)) != NULL) {
443 TAILQ_REMOVE(&sq->sq_list, ksi, ksi_link);
444 ksi->ksi_sigq = NULL;
445 if (ksiginfo_tryfree(ksi) && p != NULL)
449 SIGEMPTYSET(sq->sq_signals);
450 SIGEMPTYSET(sq->sq_kill);
451 SIGEMPTYSET(sq->sq_ptrace);
455 sigqueue_move_set(sigqueue_t *src, sigqueue_t *dst, const sigset_t *set)
458 struct proc *p1, *p2;
459 ksiginfo_t *ksi, *next;
461 KASSERT(src->sq_flags & SQ_INIT, ("src sigqueue not inited"));
462 KASSERT(dst->sq_flags & SQ_INIT, ("dst sigqueue not inited"));
465 /* Move siginfo to target list */
466 TAILQ_FOREACH_SAFE(ksi, &src->sq_list, ksi_link, next) {
467 if (SIGISMEMBER(*set, ksi->ksi_signo)) {
468 TAILQ_REMOVE(&src->sq_list, ksi, ksi_link);
471 TAILQ_INSERT_TAIL(&dst->sq_list, ksi, ksi_link);
478 /* Move pending bits to target list */
480 SIGSETAND(tmp, *set);
481 SIGSETOR(dst->sq_kill, tmp);
482 SIGSETNAND(src->sq_kill, tmp);
484 tmp = src->sq_ptrace;
485 SIGSETAND(tmp, *set);
486 SIGSETOR(dst->sq_ptrace, tmp);
487 SIGSETNAND(src->sq_ptrace, tmp);
489 tmp = src->sq_signals;
490 SIGSETAND(tmp, *set);
491 SIGSETOR(dst->sq_signals, tmp);
492 SIGSETNAND(src->sq_signals, tmp);
497 sigqueue_move(sigqueue_t *src, sigqueue_t *dst, int signo)
502 SIGADDSET(set, signo);
503 sigqueue_move_set(src, dst, &set);
508 sigqueue_delete_set(sigqueue_t *sq, const sigset_t *set)
510 struct proc *p = sq->sq_proc;
511 ksiginfo_t *ksi, *next;
513 KASSERT(sq->sq_flags & SQ_INIT, ("src sigqueue not inited"));
515 /* Remove siginfo queue */
516 TAILQ_FOREACH_SAFE(ksi, &sq->sq_list, ksi_link, next) {
517 if (SIGISMEMBER(*set, ksi->ksi_signo)) {
518 TAILQ_REMOVE(&sq->sq_list, ksi, ksi_link);
519 ksi->ksi_sigq = NULL;
520 if (ksiginfo_tryfree(ksi) && p != NULL)
524 SIGSETNAND(sq->sq_kill, *set);
525 SIGSETNAND(sq->sq_ptrace, *set);
526 SIGSETNAND(sq->sq_signals, *set);
530 sigqueue_delete(sigqueue_t *sq, int signo)
535 SIGADDSET(set, signo);
536 sigqueue_delete_set(sq, &set);
539 /* Remove a set of signals for a process */
541 sigqueue_delete_set_proc(struct proc *p, const sigset_t *set)
546 PROC_LOCK_ASSERT(p, MA_OWNED);
548 sigqueue_init(&worklist, NULL);
549 sigqueue_move_set(&p->p_sigqueue, &worklist, set);
551 FOREACH_THREAD_IN_PROC(p, td0)
552 sigqueue_move_set(&td0->td_sigqueue, &worklist, set);
554 sigqueue_flush(&worklist);
558 sigqueue_delete_proc(struct proc *p, int signo)
563 SIGADDSET(set, signo);
564 sigqueue_delete_set_proc(p, &set);
568 sigqueue_delete_stopmask_proc(struct proc *p)
573 SIGADDSET(set, SIGSTOP);
574 SIGADDSET(set, SIGTSTP);
575 SIGADDSET(set, SIGTTIN);
576 SIGADDSET(set, SIGTTOU);
577 sigqueue_delete_set_proc(p, &set);
581 * Determine signal that should be delivered to thread td, the current
582 * thread, 0 if none. If there is a pending stop signal with default
583 * action, the process stops in issignal().
586 cursig(struct thread *td)
588 PROC_LOCK_ASSERT(td->td_proc, MA_OWNED);
589 mtx_assert(&td->td_proc->p_sigacts->ps_mtx, MA_OWNED);
590 THREAD_LOCK_ASSERT(td, MA_NOTOWNED);
591 return (SIGPENDING(td) ? issignal(td) : 0);
595 * Arrange for ast() to handle unmasked pending signals on return to user
596 * mode. This must be called whenever a signal is added to td_sigqueue or
597 * unmasked in td_sigmask.
600 signotify(struct thread *td)
606 PROC_LOCK_ASSERT(p, MA_OWNED);
608 if (SIGPENDING(td)) {
610 td->td_flags |= TDF_NEEDSIGCHK | TDF_ASTPENDING;
616 sigonstack(size_t sp)
618 struct thread *td = curthread;
620 return ((td->td_pflags & TDP_ALTSTACK) ?
621 #if defined(COMPAT_43)
622 ((td->td_sigstk.ss_size == 0) ?
623 (td->td_sigstk.ss_flags & SS_ONSTACK) :
624 ((sp - (size_t)td->td_sigstk.ss_sp) < td->td_sigstk.ss_size))
626 ((sp - (size_t)td->td_sigstk.ss_sp) < td->td_sigstk.ss_size)
635 if (sig > 0 && sig < NSIG)
636 return (sigproptbl[_SIG_IDX(sig)]);
641 sig_ffs(sigset_t *set)
645 for (i = 0; i < _SIG_WORDS; i++)
647 return (ffs(set->__bits[i]) + (i * 32));
652 sigact_flag_test(struct sigaction *act, int flag)
656 * SA_SIGINFO is reset when signal disposition is set to
657 * ignore or default. Other flags are kept according to user
660 return ((act->sa_flags & flag) != 0 && (flag != SA_SIGINFO ||
661 ((__sighandler_t *)act->sa_sigaction != SIG_IGN &&
662 (__sighandler_t *)act->sa_sigaction != SIG_DFL)));
672 kern_sigaction(td, sig, act, oact, flags)
675 struct sigaction *act, *oact;
679 struct proc *p = td->td_proc;
681 if (!_SIG_VALID(sig))
683 if (act != NULL && act->sa_handler != SIG_DFL &&
684 act->sa_handler != SIG_IGN && (act->sa_flags & ~(SA_ONSTACK |
685 SA_RESTART | SA_RESETHAND | SA_NOCLDSTOP | SA_NODEFER |
686 SA_NOCLDWAIT | SA_SIGINFO)) != 0)
691 mtx_lock(&ps->ps_mtx);
693 oact->sa_mask = ps->ps_catchmask[_SIG_IDX(sig)];
695 if (SIGISMEMBER(ps->ps_sigonstack, sig))
696 oact->sa_flags |= SA_ONSTACK;
697 if (!SIGISMEMBER(ps->ps_sigintr, sig))
698 oact->sa_flags |= SA_RESTART;
699 if (SIGISMEMBER(ps->ps_sigreset, sig))
700 oact->sa_flags |= SA_RESETHAND;
701 if (SIGISMEMBER(ps->ps_signodefer, sig))
702 oact->sa_flags |= SA_NODEFER;
703 if (SIGISMEMBER(ps->ps_siginfo, sig)) {
704 oact->sa_flags |= SA_SIGINFO;
706 (__siginfohandler_t *)ps->ps_sigact[_SIG_IDX(sig)];
708 oact->sa_handler = ps->ps_sigact[_SIG_IDX(sig)];
709 if (sig == SIGCHLD && ps->ps_flag & PS_NOCLDSTOP)
710 oact->sa_flags |= SA_NOCLDSTOP;
711 if (sig == SIGCHLD && ps->ps_flag & PS_NOCLDWAIT)
712 oact->sa_flags |= SA_NOCLDWAIT;
715 if ((sig == SIGKILL || sig == SIGSTOP) &&
716 act->sa_handler != SIG_DFL) {
717 mtx_unlock(&ps->ps_mtx);
723 * Change setting atomically.
726 ps->ps_catchmask[_SIG_IDX(sig)] = act->sa_mask;
727 SIG_CANTMASK(ps->ps_catchmask[_SIG_IDX(sig)]);
728 if (sigact_flag_test(act, SA_SIGINFO)) {
729 ps->ps_sigact[_SIG_IDX(sig)] =
730 (__sighandler_t *)act->sa_sigaction;
731 SIGADDSET(ps->ps_siginfo, sig);
733 ps->ps_sigact[_SIG_IDX(sig)] = act->sa_handler;
734 SIGDELSET(ps->ps_siginfo, sig);
736 if (!sigact_flag_test(act, SA_RESTART))
737 SIGADDSET(ps->ps_sigintr, sig);
739 SIGDELSET(ps->ps_sigintr, sig);
740 if (sigact_flag_test(act, SA_ONSTACK))
741 SIGADDSET(ps->ps_sigonstack, sig);
743 SIGDELSET(ps->ps_sigonstack, sig);
744 if (sigact_flag_test(act, SA_RESETHAND))
745 SIGADDSET(ps->ps_sigreset, sig);
747 SIGDELSET(ps->ps_sigreset, sig);
748 if (sigact_flag_test(act, SA_NODEFER))
749 SIGADDSET(ps->ps_signodefer, sig);
751 SIGDELSET(ps->ps_signodefer, sig);
752 if (sig == SIGCHLD) {
753 if (act->sa_flags & SA_NOCLDSTOP)
754 ps->ps_flag |= PS_NOCLDSTOP;
756 ps->ps_flag &= ~PS_NOCLDSTOP;
757 if (act->sa_flags & SA_NOCLDWAIT) {
759 * Paranoia: since SA_NOCLDWAIT is implemented
760 * by reparenting the dying child to PID 1 (and
761 * trust it to reap the zombie), PID 1 itself
762 * is forbidden to set SA_NOCLDWAIT.
765 ps->ps_flag &= ~PS_NOCLDWAIT;
767 ps->ps_flag |= PS_NOCLDWAIT;
769 ps->ps_flag &= ~PS_NOCLDWAIT;
770 if (ps->ps_sigact[_SIG_IDX(SIGCHLD)] == SIG_IGN)
771 ps->ps_flag |= PS_CLDSIGIGN;
773 ps->ps_flag &= ~PS_CLDSIGIGN;
776 * Set bit in ps_sigignore for signals that are set to SIG_IGN,
777 * and for signals set to SIG_DFL where the default is to
778 * ignore. However, don't put SIGCONT in ps_sigignore, as we
779 * have to restart the process.
781 if (ps->ps_sigact[_SIG_IDX(sig)] == SIG_IGN ||
782 (sigprop(sig) & SA_IGNORE &&
783 ps->ps_sigact[_SIG_IDX(sig)] == SIG_DFL)) {
784 /* never to be seen again */
785 sigqueue_delete_proc(p, sig);
787 /* easier in psignal */
788 SIGADDSET(ps->ps_sigignore, sig);
789 SIGDELSET(ps->ps_sigcatch, sig);
791 SIGDELSET(ps->ps_sigignore, sig);
792 if (ps->ps_sigact[_SIG_IDX(sig)] == SIG_DFL)
793 SIGDELSET(ps->ps_sigcatch, sig);
795 SIGADDSET(ps->ps_sigcatch, sig);
797 #ifdef COMPAT_FREEBSD4
798 if (ps->ps_sigact[_SIG_IDX(sig)] == SIG_IGN ||
799 ps->ps_sigact[_SIG_IDX(sig)] == SIG_DFL ||
800 (flags & KSA_FREEBSD4) == 0)
801 SIGDELSET(ps->ps_freebsd4, sig);
803 SIGADDSET(ps->ps_freebsd4, sig);
806 if (ps->ps_sigact[_SIG_IDX(sig)] == SIG_IGN ||
807 ps->ps_sigact[_SIG_IDX(sig)] == SIG_DFL ||
808 (flags & KSA_OSIGSET) == 0)
809 SIGDELSET(ps->ps_osigset, sig);
811 SIGADDSET(ps->ps_osigset, sig);
814 mtx_unlock(&ps->ps_mtx);
819 #ifndef _SYS_SYSPROTO_H_
820 struct sigaction_args {
822 struct sigaction *act;
823 struct sigaction *oact;
827 sys_sigaction(td, uap)
829 register struct sigaction_args *uap;
831 struct sigaction act, oact;
832 register struct sigaction *actp, *oactp;
835 actp = (uap->act != NULL) ? &act : NULL;
836 oactp = (uap->oact != NULL) ? &oact : NULL;
838 error = copyin(uap->act, actp, sizeof(act));
842 error = kern_sigaction(td, uap->sig, actp, oactp, 0);
844 error = copyout(oactp, uap->oact, sizeof(oact));
848 #ifdef COMPAT_FREEBSD4
849 #ifndef _SYS_SYSPROTO_H_
850 struct freebsd4_sigaction_args {
852 struct sigaction *act;
853 struct sigaction *oact;
857 freebsd4_sigaction(td, uap)
859 register struct freebsd4_sigaction_args *uap;
861 struct sigaction act, oact;
862 register struct sigaction *actp, *oactp;
866 actp = (uap->act != NULL) ? &act : NULL;
867 oactp = (uap->oact != NULL) ? &oact : NULL;
869 error = copyin(uap->act, actp, sizeof(act));
873 error = kern_sigaction(td, uap->sig, actp, oactp, KSA_FREEBSD4);
875 error = copyout(oactp, uap->oact, sizeof(oact));
878 #endif /* COMAPT_FREEBSD4 */
880 #ifdef COMPAT_43 /* XXX - COMPAT_FBSD3 */
881 #ifndef _SYS_SYSPROTO_H_
882 struct osigaction_args {
884 struct osigaction *nsa;
885 struct osigaction *osa;
891 register struct osigaction_args *uap;
893 struct osigaction sa;
894 struct sigaction nsa, osa;
895 register struct sigaction *nsap, *osap;
898 if (uap->signum <= 0 || uap->signum >= ONSIG)
901 nsap = (uap->nsa != NULL) ? &nsa : NULL;
902 osap = (uap->osa != NULL) ? &osa : NULL;
905 error = copyin(uap->nsa, &sa, sizeof(sa));
908 nsap->sa_handler = sa.sa_handler;
909 nsap->sa_flags = sa.sa_flags;
910 OSIG2SIG(sa.sa_mask, nsap->sa_mask);
912 error = kern_sigaction(td, uap->signum, nsap, osap, KSA_OSIGSET);
913 if (osap && !error) {
914 sa.sa_handler = osap->sa_handler;
915 sa.sa_flags = osap->sa_flags;
916 SIG2OSIG(osap->sa_mask, sa.sa_mask);
917 error = copyout(&sa, uap->osa, sizeof(sa));
922 #if !defined(__i386__)
923 /* Avoid replicating the same stub everywhere */
927 struct osigreturn_args *uap;
930 return (nosys(td, (struct nosys_args *)uap));
933 #endif /* COMPAT_43 */
936 * Initialize signal state for process 0;
937 * set to ignore signals that are ignored by default.
948 mtx_lock(&ps->ps_mtx);
949 for (i = 1; i <= NSIG; i++) {
950 if (sigprop(i) & SA_IGNORE && i != SIGCONT) {
951 SIGADDSET(ps->ps_sigignore, i);
954 mtx_unlock(&ps->ps_mtx);
959 * Reset specified signal to the default disposition.
962 sigdflt(struct sigacts *ps, int sig)
965 mtx_assert(&ps->ps_mtx, MA_OWNED);
966 SIGDELSET(ps->ps_sigcatch, sig);
967 if ((sigprop(sig) & SA_IGNORE) != 0 && sig != SIGCONT)
968 SIGADDSET(ps->ps_sigignore, sig);
969 ps->ps_sigact[_SIG_IDX(sig)] = SIG_DFL;
970 SIGDELSET(ps->ps_siginfo, sig);
974 * Reset signals for an exec of the specified process.
977 execsigs(struct proc *p)
984 * Reset caught signals. Held signals remain held
985 * through td_sigmask (unless they were caught,
986 * and are now ignored by default).
988 PROC_LOCK_ASSERT(p, MA_OWNED);
990 mtx_lock(&ps->ps_mtx);
991 while (SIGNOTEMPTY(ps->ps_sigcatch)) {
992 sig = sig_ffs(&ps->ps_sigcatch);
994 if ((sigprop(sig) & SA_IGNORE) != 0)
995 sigqueue_delete_proc(p, sig);
998 * Reset stack state to the user stack.
999 * Clear set of signals caught on the signal stack.
1002 MPASS(td->td_proc == p);
1003 td->td_sigstk.ss_flags = SS_DISABLE;
1004 td->td_sigstk.ss_size = 0;
1005 td->td_sigstk.ss_sp = 0;
1006 td->td_pflags &= ~TDP_ALTSTACK;
1008 * Reset no zombies if child dies flag as Solaris does.
1010 ps->ps_flag &= ~(PS_NOCLDWAIT | PS_CLDSIGIGN);
1011 if (ps->ps_sigact[_SIG_IDX(SIGCHLD)] == SIG_IGN)
1012 ps->ps_sigact[_SIG_IDX(SIGCHLD)] = SIG_DFL;
1013 mtx_unlock(&ps->ps_mtx);
1017 * kern_sigprocmask()
1019 * Manipulate signal mask.
1022 kern_sigprocmask(struct thread *td, int how, sigset_t *set, sigset_t *oset,
1025 sigset_t new_block, oset1;
1030 if ((flags & SIGPROCMASK_PROC_LOCKED) != 0)
1031 PROC_LOCK_ASSERT(p, MA_OWNED);
1034 mtx_assert(&p->p_sigacts->ps_mtx, (flags & SIGPROCMASK_PS_LOCKED) != 0
1035 ? MA_OWNED : MA_NOTOWNED);
1037 *oset = td->td_sigmask;
1044 oset1 = td->td_sigmask;
1045 SIGSETOR(td->td_sigmask, *set);
1046 new_block = td->td_sigmask;
1047 SIGSETNAND(new_block, oset1);
1050 SIGSETNAND(td->td_sigmask, *set);
1055 oset1 = td->td_sigmask;
1056 if (flags & SIGPROCMASK_OLD)
1057 SIGSETLO(td->td_sigmask, *set);
1059 td->td_sigmask = *set;
1060 new_block = td->td_sigmask;
1061 SIGSETNAND(new_block, oset1);
1070 * The new_block set contains signals that were not previously
1071 * blocked, but are blocked now.
1073 * In case we block any signal that was not previously blocked
1074 * for td, and process has the signal pending, try to schedule
1075 * signal delivery to some thread that does not block the
1076 * signal, possibly waking it up.
1078 if (p->p_numthreads != 1)
1079 reschedule_signals(p, new_block, flags);
1083 if (!(flags & SIGPROCMASK_PROC_LOCKED))
1088 #ifndef _SYS_SYSPROTO_H_
1089 struct sigprocmask_args {
1091 const sigset_t *set;
1096 sys_sigprocmask(td, uap)
1097 register struct thread *td;
1098 struct sigprocmask_args *uap;
1101 sigset_t *setp, *osetp;
1104 setp = (uap->set != NULL) ? &set : NULL;
1105 osetp = (uap->oset != NULL) ? &oset : NULL;
1107 error = copyin(uap->set, setp, sizeof(set));
1111 error = kern_sigprocmask(td, uap->how, setp, osetp, 0);
1112 if (osetp && !error) {
1113 error = copyout(osetp, uap->oset, sizeof(oset));
1118 #ifdef COMPAT_43 /* XXX - COMPAT_FBSD3 */
1119 #ifndef _SYS_SYSPROTO_H_
1120 struct osigprocmask_args {
1126 osigprocmask(td, uap)
1127 register struct thread *td;
1128 struct osigprocmask_args *uap;
1133 OSIG2SIG(uap->mask, set);
1134 error = kern_sigprocmask(td, uap->how, &set, &oset, 1);
1135 SIG2OSIG(oset, td->td_retval[0]);
1138 #endif /* COMPAT_43 */
1141 sys_sigwait(struct thread *td, struct sigwait_args *uap)
1147 error = copyin(uap->set, &set, sizeof(set));
1149 td->td_retval[0] = error;
1153 error = kern_sigtimedwait(td, set, &ksi, NULL);
1155 if (error == EINTR && td->td_proc->p_osrel < P_OSREL_SIGWAIT)
1157 if (error == ERESTART)
1159 td->td_retval[0] = error;
1163 error = copyout(&ksi.ksi_signo, uap->sig, sizeof(ksi.ksi_signo));
1164 td->td_retval[0] = error;
1169 sys_sigtimedwait(struct thread *td, struct sigtimedwait_args *uap)
1172 struct timespec *timeout;
1178 error = copyin(uap->timeout, &ts, sizeof(ts));
1186 error = copyin(uap->set, &set, sizeof(set));
1190 error = kern_sigtimedwait(td, set, &ksi, timeout);
1195 error = copyout(&ksi.ksi_info, uap->info, sizeof(siginfo_t));
1198 td->td_retval[0] = ksi.ksi_signo;
1203 sys_sigwaitinfo(struct thread *td, struct sigwaitinfo_args *uap)
1209 error = copyin(uap->set, &set, sizeof(set));
1213 error = kern_sigtimedwait(td, set, &ksi, NULL);
1218 error = copyout(&ksi.ksi_info, uap->info, sizeof(siginfo_t));
1221 td->td_retval[0] = ksi.ksi_signo;
1226 kern_sigtimedwait(struct thread *td, sigset_t waitset, ksiginfo_t *ksi,
1227 struct timespec *timeout)
1230 sigset_t saved_mask, new_block;
1232 int error, sig, timo, timevalid = 0;
1233 struct timespec rts, ets, ts;
1241 if (timeout != NULL) {
1242 if (timeout->tv_nsec >= 0 && timeout->tv_nsec < 1000000000) {
1244 getnanouptime(&rts);
1246 timespecadd(&ets, timeout);
1250 /* Some signals can not be waited for. */
1251 SIG_CANTMASK(waitset);
1254 saved_mask = td->td_sigmask;
1255 SIGSETNAND(td->td_sigmask, waitset);
1257 mtx_lock(&ps->ps_mtx);
1259 mtx_unlock(&ps->ps_mtx);
1260 if (sig != 0 && SIGISMEMBER(waitset, sig)) {
1261 if (sigqueue_get(&td->td_sigqueue, sig, ksi) != 0 ||
1262 sigqueue_get(&p->p_sigqueue, sig, ksi) != 0) {
1272 * POSIX says this must be checked after looking for pending
1275 if (timeout != NULL) {
1280 getnanouptime(&rts);
1281 if (timespeccmp(&rts, &ets, >=)) {
1286 timespecsub(&ts, &rts);
1287 TIMESPEC_TO_TIMEVAL(&tv, &ts);
1293 error = msleep(ps, &p->p_mtx, PPAUSE|PCATCH, "sigwait", timo);
1295 if (timeout != NULL) {
1296 if (error == ERESTART) {
1297 /* Timeout can not be restarted. */
1299 } else if (error == EAGAIN) {
1300 /* We will calculate timeout by ourself. */
1306 new_block = saved_mask;
1307 SIGSETNAND(new_block, td->td_sigmask);
1308 td->td_sigmask = saved_mask;
1310 * Fewer signals can be delivered to us, reschedule signal
1313 if (p->p_numthreads != 1)
1314 reschedule_signals(p, new_block, 0);
1317 SDT_PROBE2(proc, , , signal__clear, sig, ksi);
1319 if (ksi->ksi_code == SI_TIMER)
1320 itimer_accept(p, ksi->ksi_timerid, ksi);
1323 if (KTRPOINT(td, KTR_PSIG)) {
1326 mtx_lock(&ps->ps_mtx);
1327 action = ps->ps_sigact[_SIG_IDX(sig)];
1328 mtx_unlock(&ps->ps_mtx);
1329 ktrpsig(sig, action, &td->td_sigmask, ksi->ksi_code);
1339 #ifndef _SYS_SYSPROTO_H_
1340 struct sigpending_args {
1345 sys_sigpending(td, uap)
1347 struct sigpending_args *uap;
1349 struct proc *p = td->td_proc;
1353 pending = p->p_sigqueue.sq_signals;
1354 SIGSETOR(pending, td->td_sigqueue.sq_signals);
1356 return (copyout(&pending, uap->set, sizeof(sigset_t)));
1359 #ifdef COMPAT_43 /* XXX - COMPAT_FBSD3 */
1360 #ifndef _SYS_SYSPROTO_H_
1361 struct osigpending_args {
1366 osigpending(td, uap)
1368 struct osigpending_args *uap;
1370 struct proc *p = td->td_proc;
1374 pending = p->p_sigqueue.sq_signals;
1375 SIGSETOR(pending, td->td_sigqueue.sq_signals);
1377 SIG2OSIG(pending, td->td_retval[0]);
1380 #endif /* COMPAT_43 */
1382 #if defined(COMPAT_43)
1384 * Generalized interface signal handler, 4.3-compatible.
1386 #ifndef _SYS_SYSPROTO_H_
1387 struct osigvec_args {
1397 register struct osigvec_args *uap;
1400 struct sigaction nsa, osa;
1401 register struct sigaction *nsap, *osap;
1404 if (uap->signum <= 0 || uap->signum >= ONSIG)
1406 nsap = (uap->nsv != NULL) ? &nsa : NULL;
1407 osap = (uap->osv != NULL) ? &osa : NULL;
1409 error = copyin(uap->nsv, &vec, sizeof(vec));
1412 nsap->sa_handler = vec.sv_handler;
1413 OSIG2SIG(vec.sv_mask, nsap->sa_mask);
1414 nsap->sa_flags = vec.sv_flags;
1415 nsap->sa_flags ^= SA_RESTART; /* opposite of SV_INTERRUPT */
1417 error = kern_sigaction(td, uap->signum, nsap, osap, KSA_OSIGSET);
1418 if (osap && !error) {
1419 vec.sv_handler = osap->sa_handler;
1420 SIG2OSIG(osap->sa_mask, vec.sv_mask);
1421 vec.sv_flags = osap->sa_flags;
1422 vec.sv_flags &= ~SA_NOCLDWAIT;
1423 vec.sv_flags ^= SA_RESTART;
1424 error = copyout(&vec, uap->osv, sizeof(vec));
1429 #ifndef _SYS_SYSPROTO_H_
1430 struct osigblock_args {
1436 register struct thread *td;
1437 struct osigblock_args *uap;
1441 OSIG2SIG(uap->mask, set);
1442 kern_sigprocmask(td, SIG_BLOCK, &set, &oset, 0);
1443 SIG2OSIG(oset, td->td_retval[0]);
1447 #ifndef _SYS_SYSPROTO_H_
1448 struct osigsetmask_args {
1453 osigsetmask(td, uap)
1455 struct osigsetmask_args *uap;
1459 OSIG2SIG(uap->mask, set);
1460 kern_sigprocmask(td, SIG_SETMASK, &set, &oset, 0);
1461 SIG2OSIG(oset, td->td_retval[0]);
1464 #endif /* COMPAT_43 */
1467 * Suspend calling thread until signal, providing mask to be set in the
1470 #ifndef _SYS_SYSPROTO_H_
1471 struct sigsuspend_args {
1472 const sigset_t *sigmask;
1477 sys_sigsuspend(td, uap)
1479 struct sigsuspend_args *uap;
1484 error = copyin(uap->sigmask, &mask, sizeof(mask));
1487 return (kern_sigsuspend(td, mask));
1491 kern_sigsuspend(struct thread *td, sigset_t mask)
1493 struct proc *p = td->td_proc;
1497 * When returning from sigsuspend, we want
1498 * the old mask to be restored after the
1499 * signal handler has finished. Thus, we
1500 * save it here and mark the sigacts structure
1504 kern_sigprocmask(td, SIG_SETMASK, &mask, &td->td_oldsigmask,
1505 SIGPROCMASK_PROC_LOCKED);
1506 td->td_pflags |= TDP_OLDMASK;
1509 * Process signals now. Otherwise, we can get spurious wakeup
1510 * due to signal entered process queue, but delivered to other
1511 * thread. But sigsuspend should return only on signal
1514 (p->p_sysent->sv_set_syscall_retval)(td, EINTR);
1515 for (has_sig = 0; !has_sig;) {
1516 while (msleep(&p->p_sigacts, &p->p_mtx, PPAUSE|PCATCH, "pause",
1519 thread_suspend_check(0);
1520 mtx_lock(&p->p_sigacts->ps_mtx);
1521 while ((sig = cursig(td)) != 0)
1522 has_sig += postsig(sig);
1523 mtx_unlock(&p->p_sigacts->ps_mtx);
1526 td->td_errno = EINTR;
1527 td->td_pflags |= TDP_NERRNO;
1528 return (EJUSTRETURN);
1531 #ifdef COMPAT_43 /* XXX - COMPAT_FBSD3 */
1533 * Compatibility sigsuspend call for old binaries. Note nonstandard calling
1534 * convention: libc stub passes mask, not pointer, to save a copyin.
1536 #ifndef _SYS_SYSPROTO_H_
1537 struct osigsuspend_args {
1543 osigsuspend(td, uap)
1545 struct osigsuspend_args *uap;
1549 OSIG2SIG(uap->mask, mask);
1550 return (kern_sigsuspend(td, mask));
1552 #endif /* COMPAT_43 */
1554 #if defined(COMPAT_43)
1555 #ifndef _SYS_SYSPROTO_H_
1556 struct osigstack_args {
1557 struct sigstack *nss;
1558 struct sigstack *oss;
1565 register struct osigstack_args *uap;
1567 struct sigstack nss, oss;
1570 if (uap->nss != NULL) {
1571 error = copyin(uap->nss, &nss, sizeof(nss));
1575 oss.ss_sp = td->td_sigstk.ss_sp;
1576 oss.ss_onstack = sigonstack(cpu_getstack(td));
1577 if (uap->nss != NULL) {
1578 td->td_sigstk.ss_sp = nss.ss_sp;
1579 td->td_sigstk.ss_size = 0;
1580 td->td_sigstk.ss_flags |= nss.ss_onstack & SS_ONSTACK;
1581 td->td_pflags |= TDP_ALTSTACK;
1583 if (uap->oss != NULL)
1584 error = copyout(&oss, uap->oss, sizeof(oss));
1588 #endif /* COMPAT_43 */
1590 #ifndef _SYS_SYSPROTO_H_
1591 struct sigaltstack_args {
1598 sys_sigaltstack(td, uap)
1600 register struct sigaltstack_args *uap;
1605 if (uap->ss != NULL) {
1606 error = copyin(uap->ss, &ss, sizeof(ss));
1610 error = kern_sigaltstack(td, (uap->ss != NULL) ? &ss : NULL,
1611 (uap->oss != NULL) ? &oss : NULL);
1614 if (uap->oss != NULL)
1615 error = copyout(&oss, uap->oss, sizeof(stack_t));
1620 kern_sigaltstack(struct thread *td, stack_t *ss, stack_t *oss)
1622 struct proc *p = td->td_proc;
1625 oonstack = sigonstack(cpu_getstack(td));
1628 *oss = td->td_sigstk;
1629 oss->ss_flags = (td->td_pflags & TDP_ALTSTACK)
1630 ? ((oonstack) ? SS_ONSTACK : 0) : SS_DISABLE;
1636 if ((ss->ss_flags & ~SS_DISABLE) != 0)
1638 if (!(ss->ss_flags & SS_DISABLE)) {
1639 if (ss->ss_size < p->p_sysent->sv_minsigstksz)
1642 td->td_sigstk = *ss;
1643 td->td_pflags |= TDP_ALTSTACK;
1645 td->td_pflags &= ~TDP_ALTSTACK;
1652 * Common code for kill process group/broadcast kill.
1653 * cp is calling process.
1656 killpg1(struct thread *td, int sig, int pgid, int all, ksiginfo_t *ksi)
1668 sx_slock(&allproc_lock);
1669 FOREACH_PROC_IN_SYSTEM(p) {
1671 if (p->p_pid <= 1 || p->p_flag & P_SYSTEM ||
1672 p == td->td_proc || p->p_state == PRS_NEW) {
1676 err = p_cansignal(td, p, sig);
1679 pksignal(p, sig, ksi);
1682 else if (ret == ESRCH)
1686 sx_sunlock(&allproc_lock);
1688 sx_slock(&proctree_lock);
1691 * zero pgid means send to my process group.
1693 pgrp = td->td_proc->p_pgrp;
1696 pgrp = pgfind(pgid);
1698 sx_sunlock(&proctree_lock);
1702 sx_sunlock(&proctree_lock);
1703 LIST_FOREACH(p, &pgrp->pg_members, p_pglist) {
1705 if (p->p_pid <= 1 || p->p_flag & P_SYSTEM ||
1706 p->p_state == PRS_NEW) {
1710 err = p_cansignal(td, p, sig);
1713 pksignal(p, sig, ksi);
1716 else if (ret == ESRCH)
1725 #ifndef _SYS_SYSPROTO_H_
1733 sys_kill(struct thread *td, struct kill_args *uap)
1740 * A process in capability mode can send signals only to himself.
1741 * The main rationale behind this is that abort(3) is implemented as
1742 * kill(getpid(), SIGABRT).
1744 if (IN_CAPABILITY_MODE(td) && uap->pid != td->td_proc->p_pid)
1747 AUDIT_ARG_SIGNUM(uap->signum);
1748 AUDIT_ARG_PID(uap->pid);
1749 if ((u_int)uap->signum > _SIG_MAXSIG)
1752 ksiginfo_init(&ksi);
1753 ksi.ksi_signo = uap->signum;
1754 ksi.ksi_code = SI_USER;
1755 ksi.ksi_pid = td->td_proc->p_pid;
1756 ksi.ksi_uid = td->td_ucred->cr_ruid;
1759 /* kill single process */
1760 if ((p = pfind(uap->pid)) == NULL) {
1761 if ((p = zpfind(uap->pid)) == NULL)
1764 AUDIT_ARG_PROCESS(p);
1765 error = p_cansignal(td, p, uap->signum);
1766 if (error == 0 && uap->signum)
1767 pksignal(p, uap->signum, &ksi);
1772 case -1: /* broadcast signal */
1773 return (killpg1(td, uap->signum, 0, 1, &ksi));
1774 case 0: /* signal own process group */
1775 return (killpg1(td, uap->signum, 0, 0, &ksi));
1776 default: /* negative explicit process group */
1777 return (killpg1(td, uap->signum, -uap->pid, 0, &ksi));
1785 struct pdkill_args *uap;
1789 cap_rights_t rights;
1792 AUDIT_ARG_SIGNUM(uap->signum);
1793 AUDIT_ARG_FD(uap->fd);
1794 if ((u_int)uap->signum > _SIG_MAXSIG)
1797 error = procdesc_find(td, uap->fd,
1798 cap_rights_init(&rights, CAP_PDKILL), &p);
1801 AUDIT_ARG_PROCESS(p);
1802 error = p_cansignal(td, p, uap->signum);
1803 if (error == 0 && uap->signum)
1804 kern_psignal(p, uap->signum);
1812 #if defined(COMPAT_43)
1813 #ifndef _SYS_SYSPROTO_H_
1814 struct okillpg_args {
1821 okillpg(struct thread *td, struct okillpg_args *uap)
1825 AUDIT_ARG_SIGNUM(uap->signum);
1826 AUDIT_ARG_PID(uap->pgid);
1827 if ((u_int)uap->signum > _SIG_MAXSIG)
1830 ksiginfo_init(&ksi);
1831 ksi.ksi_signo = uap->signum;
1832 ksi.ksi_code = SI_USER;
1833 ksi.ksi_pid = td->td_proc->p_pid;
1834 ksi.ksi_uid = td->td_ucred->cr_ruid;
1835 return (killpg1(td, uap->signum, uap->pgid, 0, &ksi));
1837 #endif /* COMPAT_43 */
1839 #ifndef _SYS_SYSPROTO_H_
1840 struct sigqueue_args {
1843 /* union sigval */ void *value;
1847 sys_sigqueue(struct thread *td, struct sigqueue_args *uap)
1853 if ((u_int)uap->signum > _SIG_MAXSIG)
1857 * Specification says sigqueue can only send signal to
1863 if ((p = pfind(uap->pid)) == NULL) {
1864 if ((p = zpfind(uap->pid)) == NULL)
1867 error = p_cansignal(td, p, uap->signum);
1868 if (error == 0 && uap->signum != 0) {
1869 ksiginfo_init(&ksi);
1870 ksi.ksi_flags = KSI_SIGQ;
1871 ksi.ksi_signo = uap->signum;
1872 ksi.ksi_code = SI_QUEUE;
1873 ksi.ksi_pid = td->td_proc->p_pid;
1874 ksi.ksi_uid = td->td_ucred->cr_ruid;
1875 ksi.ksi_value.sival_ptr = uap->value;
1876 error = pksignal(p, ksi.ksi_signo, &ksi);
1883 * Send a signal to a process group.
1886 gsignal(int pgid, int sig, ksiginfo_t *ksi)
1891 sx_slock(&proctree_lock);
1892 pgrp = pgfind(pgid);
1893 sx_sunlock(&proctree_lock);
1895 pgsignal(pgrp, sig, 0, ksi);
1902 * Send a signal to a process group. If checktty is 1,
1903 * limit to members which have a controlling terminal.
1906 pgsignal(struct pgrp *pgrp, int sig, int checkctty, ksiginfo_t *ksi)
1911 PGRP_LOCK_ASSERT(pgrp, MA_OWNED);
1912 LIST_FOREACH(p, &pgrp->pg_members, p_pglist) {
1914 if (p->p_state == PRS_NORMAL &&
1915 (checkctty == 0 || p->p_flag & P_CONTROLT))
1916 pksignal(p, sig, ksi);
1924 * Recalculate the signal mask and reset the signal disposition after
1925 * usermode frame for delivery is formed. Should be called after
1926 * mach-specific routine, because sysent->sv_sendsig() needs correct
1927 * ps_siginfo and signal mask.
1930 postsig_done(int sig, struct thread *td, struct sigacts *ps)
1934 mtx_assert(&ps->ps_mtx, MA_OWNED);
1935 td->td_ru.ru_nsignals++;
1936 mask = ps->ps_catchmask[_SIG_IDX(sig)];
1937 if (!SIGISMEMBER(ps->ps_signodefer, sig))
1938 SIGADDSET(mask, sig);
1939 kern_sigprocmask(td, SIG_BLOCK, &mask, NULL,
1940 SIGPROCMASK_PROC_LOCKED | SIGPROCMASK_PS_LOCKED);
1941 if (SIGISMEMBER(ps->ps_sigreset, sig))
1947 * Send a signal caused by a trap to the current thread. If it will be
1948 * caught immediately, deliver it with correct code. Otherwise, post it
1952 trapsignal(struct thread *td, ksiginfo_t *ksi)
1960 sig = ksi->ksi_signo;
1961 code = ksi->ksi_code;
1962 KASSERT(_SIG_VALID(sig), ("invalid signal"));
1966 mtx_lock(&ps->ps_mtx);
1967 if ((p->p_flag & P_TRACED) == 0 && SIGISMEMBER(ps->ps_sigcatch, sig) &&
1968 !SIGISMEMBER(td->td_sigmask, sig)) {
1970 if (KTRPOINT(curthread, KTR_PSIG))
1971 ktrpsig(sig, ps->ps_sigact[_SIG_IDX(sig)],
1972 &td->td_sigmask, code);
1974 (*p->p_sysent->sv_sendsig)(ps->ps_sigact[_SIG_IDX(sig)],
1975 ksi, &td->td_sigmask);
1976 postsig_done(sig, td, ps);
1977 mtx_unlock(&ps->ps_mtx);
1980 * Avoid a possible infinite loop if the thread
1981 * masking the signal or process is ignoring the
1984 if (kern_forcesigexit &&
1985 (SIGISMEMBER(td->td_sigmask, sig) ||
1986 ps->ps_sigact[_SIG_IDX(sig)] == SIG_IGN)) {
1987 SIGDELSET(td->td_sigmask, sig);
1988 SIGDELSET(ps->ps_sigcatch, sig);
1989 SIGDELSET(ps->ps_sigignore, sig);
1990 ps->ps_sigact[_SIG_IDX(sig)] = SIG_DFL;
1992 mtx_unlock(&ps->ps_mtx);
1993 p->p_code = code; /* XXX for core dump/debugger */
1994 p->p_sig = sig; /* XXX to verify code */
1995 tdsendsignal(p, td, sig, ksi);
2000 static struct thread *
2001 sigtd(struct proc *p, int sig, int prop)
2003 struct thread *td, *signal_td;
2005 PROC_LOCK_ASSERT(p, MA_OWNED);
2008 * Check if current thread can handle the signal without
2009 * switching context to another thread.
2011 if (curproc == p && !SIGISMEMBER(curthread->td_sigmask, sig))
2014 FOREACH_THREAD_IN_PROC(p, td) {
2015 if (!SIGISMEMBER(td->td_sigmask, sig)) {
2020 if (signal_td == NULL)
2021 signal_td = FIRST_THREAD_IN_PROC(p);
2026 * Send the signal to the process. If the signal has an action, the action
2027 * is usually performed by the target process rather than the caller; we add
2028 * the signal to the set of pending signals for the process.
2031 * o When a stop signal is sent to a sleeping process that takes the
2032 * default action, the process is stopped without awakening it.
2033 * o SIGCONT restarts stopped processes (or puts them back to sleep)
2034 * regardless of the signal action (eg, blocked or ignored).
2036 * Other ignored signals are discarded immediately.
2038 * NB: This function may be entered from the debugger via the "kill" DDB
2039 * command. There is little that can be done to mitigate the possibly messy
2040 * side effects of this unwise possibility.
2043 kern_psignal(struct proc *p, int sig)
2047 ksiginfo_init(&ksi);
2048 ksi.ksi_signo = sig;
2049 ksi.ksi_code = SI_KERNEL;
2050 (void) tdsendsignal(p, NULL, sig, &ksi);
2054 pksignal(struct proc *p, int sig, ksiginfo_t *ksi)
2057 return (tdsendsignal(p, NULL, sig, ksi));
2060 /* Utility function for finding a thread to send signal event to. */
2062 sigev_findtd(struct proc *p ,struct sigevent *sigev, struct thread **ttd)
2066 if (sigev->sigev_notify == SIGEV_THREAD_ID) {
2067 td = tdfind(sigev->sigev_notify_thread_id, p->p_pid);
2079 tdsignal(struct thread *td, int sig)
2083 ksiginfo_init(&ksi);
2084 ksi.ksi_signo = sig;
2085 ksi.ksi_code = SI_KERNEL;
2086 (void) tdsendsignal(td->td_proc, td, sig, &ksi);
2090 tdksignal(struct thread *td, int sig, ksiginfo_t *ksi)
2093 (void) tdsendsignal(td->td_proc, td, sig, ksi);
2097 tdsendsignal(struct proc *p, struct thread *td, int sig, ksiginfo_t *ksi)
2100 sigqueue_t *sigqueue;
2107 MPASS(td == NULL || p == td->td_proc);
2108 PROC_LOCK_ASSERT(p, MA_OWNED);
2110 if (!_SIG_VALID(sig))
2111 panic("%s(): invalid signal %d", __func__, sig);
2113 KASSERT(ksi == NULL || !KSI_ONQ(ksi), ("%s: ksi on queue", __func__));
2116 * IEEE Std 1003.1-2001: return success when killing a zombie.
2118 if (p->p_state == PRS_ZOMBIE) {
2119 if (ksi && (ksi->ksi_flags & KSI_INS))
2120 ksiginfo_tryfree(ksi);
2125 KNOTE_LOCKED(&p->p_klist, NOTE_SIGNAL | sig);
2126 prop = sigprop(sig);
2129 td = sigtd(p, sig, prop);
2130 sigqueue = &p->p_sigqueue;
2132 sigqueue = &td->td_sigqueue;
2134 SDT_PROBE3(proc, , , signal__send, td, p, sig);
2137 * If the signal is being ignored,
2138 * then we forget about it immediately.
2139 * (Note: we don't set SIGCONT in ps_sigignore,
2140 * and if it is set to SIG_IGN,
2141 * action will be SIG_DFL here.)
2143 mtx_lock(&ps->ps_mtx);
2144 if (SIGISMEMBER(ps->ps_sigignore, sig)) {
2145 SDT_PROBE3(proc, , , signal__discard, td, p, sig);
2147 mtx_unlock(&ps->ps_mtx);
2148 if (ksi && (ksi->ksi_flags & KSI_INS))
2149 ksiginfo_tryfree(ksi);
2152 if (SIGISMEMBER(td->td_sigmask, sig))
2154 else if (SIGISMEMBER(ps->ps_sigcatch, sig))
2158 if (SIGISMEMBER(ps->ps_sigintr, sig))
2162 mtx_unlock(&ps->ps_mtx);
2165 sigqueue_delete_stopmask_proc(p);
2166 else if (prop & SA_STOP) {
2168 * If sending a tty stop signal to a member of an orphaned
2169 * process group, discard the signal here if the action
2170 * is default; don't stop the process below if sleeping,
2171 * and don't clear any pending SIGCONT.
2173 if ((prop & SA_TTYSTOP) &&
2174 (p->p_pgrp->pg_jobc == 0) &&
2175 (action == SIG_DFL)) {
2176 if (ksi && (ksi->ksi_flags & KSI_INS))
2177 ksiginfo_tryfree(ksi);
2180 sigqueue_delete_proc(p, SIGCONT);
2181 if (p->p_flag & P_CONTINUED) {
2182 p->p_flag &= ~P_CONTINUED;
2183 PROC_LOCK(p->p_pptr);
2184 sigqueue_take(p->p_ksi);
2185 PROC_UNLOCK(p->p_pptr);
2189 ret = sigqueue_add(sigqueue, sig, ksi);
2194 * Defer further processing for signals which are held,
2195 * except that stopped processes must be continued by SIGCONT.
2197 if (action == SIG_HOLD &&
2198 !((prop & SA_CONT) && (p->p_flag & P_STOPPED_SIG)))
2201 * SIGKILL: Remove procfs STOPEVENTs and ptrace events.
2203 if (sig == SIGKILL) {
2205 /* from procfs_ioctl.c: PIOCBIC */
2207 /* from procfs_ioctl.c: PIOCCONT */
2212 * Some signals have a process-wide effect and a per-thread
2213 * component. Most processing occurs when the process next
2214 * tries to cross the user boundary, however there are some
2215 * times when processing needs to be done immediately, such as
2216 * waking up threads so that they can cross the user boundary.
2217 * We try to do the per-process part here.
2219 if (P_SHOULDSTOP(p)) {
2220 KASSERT(!(p->p_flag & P_WEXIT),
2221 ("signal to stopped but exiting process"));
2222 if (sig == SIGKILL) {
2224 * If traced process is already stopped,
2225 * then no further action is necessary.
2227 if (p->p_flag & P_TRACED)
2230 * SIGKILL sets process running.
2231 * It will die elsewhere.
2232 * All threads must be restarted.
2234 p->p_flag &= ~P_STOPPED_SIG;
2238 if (prop & SA_CONT) {
2240 * If traced process is already stopped,
2241 * then no further action is necessary.
2243 if (p->p_flag & P_TRACED)
2246 * If SIGCONT is default (or ignored), we continue the
2247 * process but don't leave the signal in sigqueue as
2248 * it has no further action. If SIGCONT is held, we
2249 * continue the process and leave the signal in
2250 * sigqueue. If the process catches SIGCONT, let it
2251 * handle the signal itself. If it isn't waiting on
2252 * an event, it goes back to run state.
2253 * Otherwise, process goes back to sleep state.
2255 p->p_flag &= ~P_STOPPED_SIG;
2257 if (p->p_numthreads == p->p_suspcount) {
2259 p->p_flag |= P_CONTINUED;
2260 p->p_xstat = SIGCONT;
2261 PROC_LOCK(p->p_pptr);
2262 childproc_continued(p);
2263 PROC_UNLOCK(p->p_pptr);
2266 if (action == SIG_DFL) {
2267 thread_unsuspend(p);
2269 sigqueue_delete(sigqueue, sig);
2272 if (action == SIG_CATCH) {
2274 * The process wants to catch it so it needs
2275 * to run at least one thread, but which one?
2281 * The signal is not ignored or caught.
2283 thread_unsuspend(p);
2288 if (prop & SA_STOP) {
2290 * If traced process is already stopped,
2291 * then no further action is necessary.
2293 if (p->p_flag & P_TRACED)
2296 * Already stopped, don't need to stop again
2297 * (If we did the shell could get confused).
2298 * Just make sure the signal STOP bit set.
2300 p->p_flag |= P_STOPPED_SIG;
2301 sigqueue_delete(sigqueue, sig);
2306 * All other kinds of signals:
2307 * If a thread is sleeping interruptibly, simulate a
2308 * wakeup so that when it is continued it will be made
2309 * runnable and can look at the signal. However, don't make
2310 * the PROCESS runnable, leave it stopped.
2311 * It may run a bit until it hits a thread_suspend_check().
2316 if (TD_ON_SLEEPQ(td) && (td->td_flags & TDF_SINTR))
2317 wakeup_swapper = sleepq_abort(td, intrval);
2324 * Mutexes are short lived. Threads waiting on them will
2325 * hit thread_suspend_check() soon.
2327 } else if (p->p_state == PRS_NORMAL) {
2328 if (p->p_flag & P_TRACED || action == SIG_CATCH) {
2329 tdsigwakeup(td, sig, action, intrval);
2333 MPASS(action == SIG_DFL);
2335 if (prop & SA_STOP) {
2336 if (p->p_flag & (P_PPWAIT|P_WEXIT))
2338 p->p_flag |= P_STOPPED_SIG;
2341 sig_suspend_threads(td, p, 1);
2342 if (p->p_numthreads == p->p_suspcount) {
2344 * only thread sending signal to another
2345 * process can reach here, if thread is sending
2346 * signal to its process, because thread does
2347 * not suspend itself here, p_numthreads
2348 * should never be equal to p_suspcount.
2352 sigqueue_delete_proc(p, p->p_xstat);
2358 /* Not in "NORMAL" state. discard the signal. */
2359 sigqueue_delete(sigqueue, sig);
2364 * The process is not stopped so we need to apply the signal to all the
2368 tdsigwakeup(td, sig, action, intrval);
2370 thread_unsuspend(p);
2373 /* If we jump here, proc slock should not be owned. */
2374 PROC_SLOCK_ASSERT(p, MA_NOTOWNED);
2379 * The force of a signal has been directed against a single
2380 * thread. We need to see what we can do about knocking it
2381 * out of any sleep it may be in etc.
2384 tdsigwakeup(struct thread *td, int sig, sig_t action, int intrval)
2386 struct proc *p = td->td_proc;
2391 PROC_LOCK_ASSERT(p, MA_OWNED);
2392 prop = sigprop(sig);
2397 * Bring the priority of a thread up if we want it to get
2398 * killed in this lifetime. Be careful to avoid bumping the
2399 * priority of the idle thread, since we still allow to signal
2402 if (action == SIG_DFL && (prop & SA_KILL) != 0 &&
2403 td->td_priority > PUSER && !TD_IS_IDLETHREAD(td))
2404 sched_prio(td, PUSER);
2405 if (TD_ON_SLEEPQ(td)) {
2407 * If thread is sleeping uninterruptibly
2408 * we can't interrupt the sleep... the signal will
2409 * be noticed when the process returns through
2410 * trap() or syscall().
2412 if ((td->td_flags & TDF_SINTR) == 0)
2415 * If SIGCONT is default (or ignored) and process is
2416 * asleep, we are finished; the process should not
2419 if ((prop & SA_CONT) && action == SIG_DFL) {
2422 sigqueue_delete(&p->p_sigqueue, sig);
2424 * It may be on either list in this state.
2425 * Remove from both for now.
2427 sigqueue_delete(&td->td_sigqueue, sig);
2432 * Don't awaken a sleeping thread for SIGSTOP if the
2433 * STOP signal is deferred.
2435 if ((prop & SA_STOP) && (td->td_flags & TDF_SBDRY))
2439 * Give low priority threads a better chance to run.
2441 if (td->td_priority > PUSER && !TD_IS_IDLETHREAD(td))
2442 sched_prio(td, PUSER);
2444 wakeup_swapper = sleepq_abort(td, intrval);
2447 * Other states do nothing with the signal immediately,
2448 * other than kicking ourselves if we are running.
2449 * It will either never be noticed, or noticed very soon.
2452 if (TD_IS_RUNNING(td) && td != curthread)
2464 sig_suspend_threads(struct thread *td, struct proc *p, int sending)
2468 PROC_LOCK_ASSERT(p, MA_OWNED);
2469 PROC_SLOCK_ASSERT(p, MA_OWNED);
2471 FOREACH_THREAD_IN_PROC(p, td2) {
2473 td2->td_flags |= TDF_ASTPENDING | TDF_NEEDSUSPCHK;
2474 if ((TD_IS_SLEEPING(td2) || TD_IS_SWAPPED(td2)) &&
2475 (td2->td_flags & TDF_SINTR)) {
2476 if (td2->td_flags & TDF_SBDRY) {
2478 * Once a thread is asleep with
2479 * TDF_SBDRY set, it should never
2480 * become suspended due to this check.
2482 KASSERT(!TD_IS_SUSPENDED(td2),
2483 ("thread with deferred stops suspended"));
2484 } else if (!TD_IS_SUSPENDED(td2)) {
2485 thread_suspend_one(td2);
2487 } else if (!TD_IS_SUSPENDED(td2)) {
2488 if (sending || td != td2)
2489 td2->td_flags |= TDF_ASTPENDING;
2491 if (TD_IS_RUNNING(td2) && td2 != td)
2492 forward_signal(td2);
2500 * Stop the process for an event deemed interesting to the debugger. If si is
2501 * non-NULL, this is a signal exchange; the new signal requested by the
2502 * debugger will be returned for handling. If si is NULL, this is some other
2503 * type of interesting event. The debugger may request a signal be delivered in
2504 * that case as well, however it will be deferred until it can be handled.
2507 ptracestop(struct thread *td, int sig, ksiginfo_t *si)
2509 struct proc *p = td->td_proc;
2514 PROC_LOCK_ASSERT(p, MA_OWNED);
2515 KASSERT(!(p->p_flag & P_WEXIT), ("Stopping exiting process"));
2516 WITNESS_WARN(WARN_GIANTOK | WARN_SLEEPOK,
2517 &p->p_mtx.lock_object, "Stopping for traced signal");
2521 if (si == NULL || (si->ksi_flags & KSI_PTRACE) == 0) {
2522 td->td_dbgflags |= TDB_XSIG;
2523 CTR4(KTR_PTRACE, "ptracestop: tid %d (pid %d) flags %#x sig %d",
2524 td->td_tid, p->p_pid, td->td_dbgflags, sig);
2526 while ((p->p_flag & P_TRACED) && (td->td_dbgflags & TDB_XSIG)) {
2529 * Ensure that, if we've been PT_KILLed, the
2530 * exit status reflects that. Another thread
2531 * may also be in ptracestop(), having just
2532 * received the SIGKILL, but this thread was
2533 * unsuspended first.
2535 td->td_dbgflags &= ~TDB_XSIG;
2536 td->td_xsig = SIGKILL;
2540 if (p->p_flag & P_SINGLE_EXIT &&
2541 !(td->td_dbgflags & TDB_EXIT)) {
2543 * Ignore ptrace stops except for thread exit
2544 * events when the process exits.
2546 td->td_dbgflags &= ~TDB_XSIG;
2552 * Make wait(2) work. Ensure that right after the
2553 * attach, the thread which was decided to become the
2554 * leader of attach gets reported to the waiter.
2555 * Otherwise, just avoid overwriting another thread's
2556 * assignment to p_xthread. If another thread has
2557 * already set p_xthread, the current thread will get
2558 * a chance to report itself upon the next iteration.
2560 if ((td->td_dbgflags & TDB_FSTP) != 0 ||
2561 ((p->p_flag2 & P2_PTRACE_FSTP) == 0 &&
2562 p->p_xthread == NULL)) {
2565 td->td_dbgflags &= ~TDB_FSTP;
2566 p->p_flag2 &= ~P2_PTRACE_FSTP;
2567 p->p_flag |= P_STOPPED_SIG | P_STOPPED_TRACE;
2568 sig_suspend_threads(td, p, 0);
2570 if ((td->td_dbgflags & TDB_STOPATFORK) != 0) {
2571 td->td_dbgflags &= ~TDB_STOPATFORK;
2572 cv_broadcast(&p->p_dbgwait);
2575 thread_suspend_switch(td, p);
2576 if (p->p_xthread == td)
2577 p->p_xthread = NULL;
2578 if (!(p->p_flag & P_TRACED))
2580 if (td->td_dbgflags & TDB_SUSPEND) {
2581 if (p->p_flag & P_SINGLE_EXIT)
2589 if (si != NULL && sig == td->td_xsig) {
2590 /* Parent wants us to take the original signal unchanged. */
2591 si->ksi_flags |= KSI_HEAD;
2592 if (sigqueue_add(&td->td_sigqueue, sig, si) != 0)
2594 } else if (td->td_xsig != 0) {
2596 * If parent wants us to take a new signal, then it will leave
2597 * it in td->td_xsig; otherwise we just look for signals again.
2599 ksiginfo_init(&ksi);
2600 ksi.ksi_signo = td->td_xsig;
2601 ksi.ksi_flags |= KSI_PTRACE;
2602 prop = sigprop(td->td_xsig);
2603 td2 = sigtd(p, td->td_xsig, prop);
2604 tdsendsignal(p, td2, td->td_xsig, &ksi);
2609 return (td->td_xsig);
2613 reschedule_signals(struct proc *p, sigset_t block, int flags)
2619 PROC_LOCK_ASSERT(p, MA_OWNED);
2621 mtx_assert(&ps->ps_mtx, (flags & SIGPROCMASK_PS_LOCKED) != 0 ?
2622 MA_OWNED : MA_NOTOWNED);
2623 if (SIGISEMPTY(p->p_siglist))
2625 SIGSETAND(block, p->p_siglist);
2626 while ((sig = sig_ffs(&block)) != 0) {
2627 SIGDELSET(block, sig);
2628 td = sigtd(p, sig, 0);
2630 if (!(flags & SIGPROCMASK_PS_LOCKED))
2631 mtx_lock(&ps->ps_mtx);
2632 if (p->p_flag & P_TRACED || SIGISMEMBER(ps->ps_sigcatch, sig))
2633 tdsigwakeup(td, sig, SIG_CATCH,
2634 (SIGISMEMBER(ps->ps_sigintr, sig) ? EINTR :
2636 if (!(flags & SIGPROCMASK_PS_LOCKED))
2637 mtx_unlock(&ps->ps_mtx);
2642 tdsigcleanup(struct thread *td)
2648 PROC_LOCK_ASSERT(p, MA_OWNED);
2650 sigqueue_flush(&td->td_sigqueue);
2651 if (p->p_numthreads == 1)
2655 * Since we cannot handle signals, notify signal post code
2656 * about this by filling the sigmask.
2658 * Also, if needed, wake up thread(s) that do not block the
2659 * same signals as the exiting thread, since the thread might
2660 * have been selected for delivery and woken up.
2662 SIGFILLSET(unblocked);
2663 SIGSETNAND(unblocked, td->td_sigmask);
2664 SIGFILLSET(td->td_sigmask);
2665 reschedule_signals(p, unblocked, 0);
2670 * Defer the delivery of SIGSTOP for the current thread. Returns true
2671 * if stops were deferred and false if they were already deferred.
2679 if (td->td_flags & TDF_SBDRY)
2682 td->td_flags |= TDF_SBDRY;
2688 * Permit the delivery of SIGSTOP for the current thread. This does
2689 * not immediately suspend if a stop was posted. Instead, the thread
2690 * will suspend either via ast() or a subsequent interruptible sleep.
2700 prev = (td->td_flags & TDF_SBDRY) != 0;
2701 td->td_flags &= ~TDF_SBDRY;
2707 * If the current process has received a signal (should be caught or cause
2708 * termination, should interrupt current syscall), return the signal number.
2709 * Stop signals with default action are processed immediately, then cleared;
2710 * they aren't returned. This is checked after each entry to the system for
2711 * a syscall or trap (though this can usually be done without calling issignal
2712 * by checking the pending signal masks in cursig.) The normal call
2715 * while (sig = cursig(curthread))
2719 issignal(struct thread *td)
2723 struct sigqueue *queue;
2724 sigset_t sigpending;
2729 mtx_assert(&ps->ps_mtx, MA_OWNED);
2730 PROC_LOCK_ASSERT(p, MA_OWNED);
2732 int traced = (p->p_flag & P_TRACED) || (p->p_stops & S_SIG);
2734 sigpending = td->td_sigqueue.sq_signals;
2735 SIGSETOR(sigpending, p->p_sigqueue.sq_signals);
2736 SIGSETNAND(sigpending, td->td_sigmask);
2738 if (p->p_flag & P_PPWAIT || td->td_flags & TDF_SBDRY)
2739 SIG_STOPSIGMASK(sigpending);
2740 if (SIGISEMPTY(sigpending)) /* no signal to send */
2742 if ((p->p_flag & (P_TRACED | P_PPTRACE)) == P_TRACED &&
2743 (p->p_flag2 & P2_PTRACE_FSTP) != 0 &&
2744 SIGISMEMBER(sigpending, SIGSTOP)) {
2746 * If debugger just attached, always consume
2747 * SIGSTOP from ptrace(PT_ATTACH) first, to
2748 * execute the debugger attach ritual in
2752 td->td_dbgflags |= TDB_FSTP;
2754 sig = sig_ffs(&sigpending);
2757 if (p->p_stops & S_SIG) {
2758 mtx_unlock(&ps->ps_mtx);
2759 stopevent(p, S_SIG, sig);
2760 mtx_lock(&ps->ps_mtx);
2764 * We should see pending but ignored signals
2765 * only if P_TRACED was on when they were posted.
2767 if (SIGISMEMBER(ps->ps_sigignore, sig) && (traced == 0)) {
2768 sigqueue_delete(&td->td_sigqueue, sig);
2769 sigqueue_delete(&p->p_sigqueue, sig);
2772 if ((p->p_flag & (P_TRACED | P_PPTRACE)) == P_TRACED) {
2774 * If traced, always stop.
2775 * Remove old signal from queue before the stop.
2776 * XXX shrug off debugger, it causes siginfo to
2779 queue = &td->td_sigqueue;
2780 td->td_dbgksi.ksi_signo = 0;
2781 if (sigqueue_get(queue, sig, &td->td_dbgksi) == 0) {
2782 queue = &p->p_sigqueue;
2783 sigqueue_get(queue, sig, &td->td_dbgksi);
2786 mtx_unlock(&ps->ps_mtx);
2787 sig = ptracestop(td, sig, &td->td_dbgksi);
2788 mtx_lock(&ps->ps_mtx);
2791 * Keep looking if the debugger discarded the signal
2792 * or replaced it with a masked signal.
2794 * If the traced bit got turned off, go back up
2795 * to the top to rescan signals. This ensures
2796 * that p_sig* and p_sigact are consistent.
2798 if (sig == 0 || (p->p_flag & P_TRACED) == 0)
2802 prop = sigprop(sig);
2805 * Decide whether the signal should be returned.
2806 * Return the signal's number, or fall through
2807 * to clear it from the pending mask.
2809 switch ((intptr_t)p->p_sigacts->ps_sigact[_SIG_IDX(sig)]) {
2811 case (intptr_t)SIG_DFL:
2813 * Don't take default actions on system processes.
2815 if (p->p_pid <= 1) {
2818 * Are you sure you want to ignore SIGSEGV
2821 printf("Process (pid %lu) got signal %d\n",
2822 (u_long)p->p_pid, sig);
2824 break; /* == ignore */
2827 * If there is a pending stop signal to process
2828 * with default action, stop here,
2829 * then clear the signal. However,
2830 * if process is member of an orphaned
2831 * process group, ignore tty stop signals.
2833 if (prop & SA_STOP) {
2834 if (p->p_flag & (P_TRACED|P_WEXIT) ||
2835 (p->p_pgrp->pg_jobc == 0 &&
2837 break; /* == ignore */
2838 mtx_unlock(&ps->ps_mtx);
2839 WITNESS_WARN(WARN_GIANTOK | WARN_SLEEPOK,
2840 &p->p_mtx.lock_object, "Catching SIGSTOP");
2841 sigqueue_delete(&td->td_sigqueue, sig);
2842 sigqueue_delete(&p->p_sigqueue, sig);
2843 p->p_flag |= P_STOPPED_SIG;
2846 sig_suspend_threads(td, p, 0);
2847 thread_suspend_switch(td, p);
2849 mtx_lock(&ps->ps_mtx);
2851 } else if (prop & SA_IGNORE) {
2853 * Except for SIGCONT, shouldn't get here.
2854 * Default action is to ignore; drop it.
2856 break; /* == ignore */
2861 case (intptr_t)SIG_IGN:
2863 * Masking above should prevent us ever trying
2864 * to take action on an ignored signal other
2865 * than SIGCONT, unless process is traced.
2867 if ((prop & SA_CONT) == 0 &&
2868 (p->p_flag & P_TRACED) == 0)
2869 printf("issignal\n");
2870 break; /* == ignore */
2874 * This signal has an action, let
2875 * postsig() process it.
2879 sigqueue_delete(&td->td_sigqueue, sig); /* take the signal! */
2880 sigqueue_delete(&p->p_sigqueue, sig);
2887 thread_stopped(struct proc *p)
2891 PROC_LOCK_ASSERT(p, MA_OWNED);
2892 PROC_SLOCK_ASSERT(p, MA_OWNED);
2896 if ((p->p_flag & P_STOPPED_SIG) && (n == p->p_numthreads)) {
2898 p->p_flag &= ~P_WAITED;
2899 PROC_LOCK(p->p_pptr);
2900 childproc_stopped(p, (p->p_flag & P_TRACED) ?
2901 CLD_TRAPPED : CLD_STOPPED);
2902 PROC_UNLOCK(p->p_pptr);
2908 * Take the action for the specified signal
2909 * from the current set of pending signals.
2915 struct thread *td = curthread;
2916 register struct proc *p = td->td_proc;
2920 sigset_t returnmask;
2922 KASSERT(sig != 0, ("postsig"));
2924 PROC_LOCK_ASSERT(p, MA_OWNED);
2926 mtx_assert(&ps->ps_mtx, MA_OWNED);
2927 ksiginfo_init(&ksi);
2928 if (sigqueue_get(&td->td_sigqueue, sig, &ksi) == 0 &&
2929 sigqueue_get(&p->p_sigqueue, sig, &ksi) == 0)
2931 ksi.ksi_signo = sig;
2932 if (ksi.ksi_code == SI_TIMER)
2933 itimer_accept(p, ksi.ksi_timerid, &ksi);
2934 action = ps->ps_sigact[_SIG_IDX(sig)];
2936 if (KTRPOINT(td, KTR_PSIG))
2937 ktrpsig(sig, action, td->td_pflags & TDP_OLDMASK ?
2938 &td->td_oldsigmask : &td->td_sigmask, ksi.ksi_code);
2940 if (p->p_stops & S_SIG) {
2941 mtx_unlock(&ps->ps_mtx);
2942 stopevent(p, S_SIG, sig);
2943 mtx_lock(&ps->ps_mtx);
2946 if (action == SIG_DFL) {
2948 * Default action, where the default is to kill
2949 * the process. (Other cases were ignored above.)
2951 mtx_unlock(&ps->ps_mtx);
2956 * If we get here, the signal must be caught.
2958 KASSERT(action != SIG_IGN && !SIGISMEMBER(td->td_sigmask, sig),
2959 ("postsig action"));
2961 * Set the new mask value and also defer further
2962 * occurrences of this signal.
2964 * Special case: user has done a sigsuspend. Here the
2965 * current mask is not of interest, but rather the
2966 * mask from before the sigsuspend is what we want
2967 * restored after the signal processing is completed.
2969 if (td->td_pflags & TDP_OLDMASK) {
2970 returnmask = td->td_oldsigmask;
2971 td->td_pflags &= ~TDP_OLDMASK;
2973 returnmask = td->td_sigmask;
2975 if (p->p_sig == sig) {
2979 (*p->p_sysent->sv_sendsig)(action, &ksi, &returnmask);
2980 postsig_done(sig, td, ps);
2986 * Kill the current process for stated reason.
2994 PROC_LOCK_ASSERT(p, MA_OWNED);
2995 CTR3(KTR_PROC, "killproc: proc %p (pid %d, %s)", p, p->p_pid,
2997 log(LOG_ERR, "pid %d (%s), uid %d, was killed: %s\n", p->p_pid,
2998 p->p_comm, p->p_ucred ? p->p_ucred->cr_uid : -1, why);
2999 p->p_flag |= P_WKILLED;
3000 kern_psignal(p, SIGKILL);
3004 * Force the current process to exit with the specified signal, dumping core
3005 * if appropriate. We bypass the normal tests for masked and caught signals,
3006 * allowing unrecoverable failures to terminate the process without changing
3007 * signal state. Mark the accounting record with the signal termination.
3008 * If dumping core, save the signal number for the debugger. Calls exit and
3016 struct proc *p = td->td_proc;
3018 PROC_LOCK_ASSERT(p, MA_OWNED);
3019 p->p_acflag |= AXSIG;
3021 * We must be single-threading to generate a core dump. This
3022 * ensures that the registers in the core file are up-to-date.
3023 * Also, the ELF dump handler assumes that the thread list doesn't
3024 * change out from under it.
3026 * XXX If another thread attempts to single-thread before us
3027 * (e.g. via fork()), we won't get a dump at all.
3029 if ((sigprop(sig) & SA_CORE) && thread_single(p, SINGLE_NO_EXIT) == 0) {
3032 * Log signals which would cause core dumps
3033 * (Log as LOG_INFO to appease those who don't want
3035 * XXX : Todo, as well as euid, write out ruid too
3036 * Note that coredump() drops proc lock.
3038 if (coredump(td) == 0)
3040 if (kern_logsigexit)
3042 "pid %d (%s), uid %d: exited on signal %d%s\n",
3043 p->p_pid, p->p_comm,
3044 td->td_ucred ? td->td_ucred->cr_uid : -1,
3046 sig & WCOREFLAG ? " (core dumped)" : "");
3049 exit1(td, W_EXITCODE(0, sig));
3054 * Send queued SIGCHLD to parent when child process's state
3058 sigparent(struct proc *p, int reason, int status)
3060 PROC_LOCK_ASSERT(p, MA_OWNED);
3061 PROC_LOCK_ASSERT(p->p_pptr, MA_OWNED);
3063 if (p->p_ksi != NULL) {
3064 p->p_ksi->ksi_signo = SIGCHLD;
3065 p->p_ksi->ksi_code = reason;
3066 p->p_ksi->ksi_status = status;
3067 p->p_ksi->ksi_pid = p->p_pid;
3068 p->p_ksi->ksi_uid = p->p_ucred->cr_ruid;
3069 if (KSI_ONQ(p->p_ksi))
3072 pksignal(p->p_pptr, SIGCHLD, p->p_ksi);
3076 childproc_jobstate(struct proc *p, int reason, int sig)
3080 PROC_LOCK_ASSERT(p, MA_OWNED);
3081 PROC_LOCK_ASSERT(p->p_pptr, MA_OWNED);
3084 * Wake up parent sleeping in kern_wait(), also send
3085 * SIGCHLD to parent, but SIGCHLD does not guarantee
3086 * that parent will awake, because parent may masked
3089 p->p_pptr->p_flag |= P_STATCHILD;
3092 ps = p->p_pptr->p_sigacts;
3093 mtx_lock(&ps->ps_mtx);
3094 if ((ps->ps_flag & PS_NOCLDSTOP) == 0) {
3095 mtx_unlock(&ps->ps_mtx);
3096 sigparent(p, reason, sig);
3098 mtx_unlock(&ps->ps_mtx);
3102 childproc_stopped(struct proc *p, int reason)
3104 /* p_xstat is a plain signal number, not a full wait() status here. */
3105 childproc_jobstate(p, reason, p->p_xstat);
3109 childproc_continued(struct proc *p)
3111 childproc_jobstate(p, CLD_CONTINUED, SIGCONT);
3115 childproc_exited(struct proc *p)
3118 int xstat = p->p_xstat; /* convert to int */
3121 if (WCOREDUMP(xstat))
3122 reason = CLD_DUMPED, status = WTERMSIG(xstat);
3123 else if (WIFSIGNALED(xstat))
3124 reason = CLD_KILLED, status = WTERMSIG(xstat);
3126 reason = CLD_EXITED, status = WEXITSTATUS(xstat);
3128 * XXX avoid calling wakeup(p->p_pptr), the work is
3131 sigparent(p, reason, status);
3135 * We only have 1 character for the core count in the format
3136 * string, so the range will be 0-9
3138 #define MAX_NUM_CORES 10
3139 static int num_cores = 5;
3142 sysctl_debug_num_cores_check (SYSCTL_HANDLER_ARGS)
3147 new_val = num_cores;
3148 error = sysctl_handle_int(oidp, &new_val, 0, req);
3149 if (error != 0 || req->newptr == NULL)
3151 if (new_val > MAX_NUM_CORES)
3152 new_val = MAX_NUM_CORES;
3155 num_cores = new_val;
3158 SYSCTL_PROC(_debug, OID_AUTO, ncores, CTLTYPE_INT|CTLFLAG_RW,
3159 0, sizeof(int), sysctl_debug_num_cores_check, "I", "");
3161 #if defined(COMPRESS_USER_CORES)
3162 int compress_user_cores = 1;
3163 SYSCTL_INT(_kern, OID_AUTO, compress_user_cores, CTLFLAG_RW,
3164 &compress_user_cores, 0, "Compression of user corefiles");
3166 int compress_user_cores_gzlevel = -1; /* default level */
3167 SYSCTL_INT(_kern, OID_AUTO, compress_user_cores_gzlevel, CTLFLAG_RW,
3168 &compress_user_cores_gzlevel, -1, "Corefile gzip compression level");
3170 #define GZ_SUFFIX ".gz"
3171 #define GZ_SUFFIX_LEN 3
3174 static char corefilename[MAXPATHLEN] = {"%N.core"};
3175 TUNABLE_STR("kern.corefile", corefilename, sizeof(corefilename));
3176 SYSCTL_STRING(_kern, OID_AUTO, corefile, CTLFLAG_RW, corefilename,
3177 sizeof(corefilename), "Process corefile name format string");
3180 * corefile_open(comm, uid, pid, td, compress, vpp, namep)
3181 * Expand the name described in corefilename, using name, uid, and pid
3182 * and open/create core file.
3183 * corefilename is a printf-like string, with three format specifiers:
3184 * %N name of process ("name")
3185 * %P process id (pid)
3187 * For example, "%N.core" is the default; they can be disabled completely
3188 * by using "/dev/null", or all core files can be stored in "/cores/%U/%N-%P".
3189 * This is controlled by the sysctl variable kern.corefile (see above).
3192 corefile_open(const char *comm, uid_t uid, pid_t pid, struct thread *td,
3193 int compress, struct vnode **vpp, char **namep)
3195 struct nameidata nd;
3198 char *hostname, *name;
3199 int indexpos, i, error, cmode, flags, oflags;
3202 format = corefilename;
3203 name = malloc(MAXPATHLEN, M_TEMP, M_WAITOK | M_ZERO);
3205 (void)sbuf_new(&sb, name, MAXPATHLEN, SBUF_FIXEDLEN);
3206 for (i = 0; format[i] != '\0'; i++) {
3207 switch (format[i]) {
3208 case '%': /* Format character */
3210 switch (format[i]) {
3212 sbuf_putc(&sb, '%');
3214 case 'H': /* hostname */
3215 if (hostname == NULL) {
3216 hostname = malloc(MAXHOSTNAMELEN,
3219 getcredhostname(td->td_ucred, hostname,
3221 sbuf_printf(&sb, "%s", hostname);
3223 case 'I': /* autoincrementing index */
3224 sbuf_printf(&sb, "0");
3225 indexpos = sbuf_len(&sb) - 1;
3227 case 'N': /* process name */
3228 sbuf_printf(&sb, "%s", comm);
3230 case 'P': /* process id */
3231 sbuf_printf(&sb, "%u", pid);
3233 case 'U': /* user id */
3234 sbuf_printf(&sb, "%u", uid);
3238 "Unknown format character %c in "
3239 "corename `%s'\n", format[i], format);
3244 sbuf_putc(&sb, format[i]);
3248 free(hostname, M_TEMP);
3249 #ifdef COMPRESS_USER_CORES
3251 sbuf_printf(&sb, GZ_SUFFIX);
3253 if (sbuf_error(&sb) != 0) {
3254 log(LOG_ERR, "pid %ld (%s), uid (%lu): corename is too "
3255 "long\n", (long)pid, comm, (u_long)uid);
3263 cmode = S_IRUSR | S_IWUSR;
3264 oflags = VN_OPEN_NOAUDIT | VN_OPEN_NAMECACHE |
3265 (capmode_coredump ? VN_OPEN_NOCAPCHECK : 0);
3268 * If the core format has a %I in it, then we need to check
3269 * for existing corefiles before returning a name.
3270 * To do this we iterate over 0..num_cores to find a
3271 * non-existing core file name to use.
3273 if (indexpos != -1) {
3274 for (i = 0; i < num_cores; i++) {
3275 flags = O_CREAT | O_EXCL | FWRITE | O_NOFOLLOW;
3276 name[indexpos] = '0' + i;
3277 NDINIT(&nd, LOOKUP, NOFOLLOW, UIO_SYSSPACE, name, td);
3278 error = vn_open_cred(&nd, &flags, cmode, oflags,
3279 td->td_ucred, NULL);
3281 if (error == EEXIST)
3284 "pid %d (%s), uid (%u): Path `%s' failed "
3285 "on initial open test, error = %d\n",
3286 pid, comm, uid, name, error);
3292 flags = O_CREAT | FWRITE | O_NOFOLLOW;
3293 NDINIT(&nd, LOOKUP, NOFOLLOW, UIO_SYSSPACE, name, td);
3294 error = vn_open_cred(&nd, &flags, cmode, oflags, td->td_ucred, NULL);
3298 audit_proc_coredump(td, name, error);
3303 NDFREE(&nd, NDF_ONLY_PNBUF);
3310 * Dump a process' core. The main routine does some
3311 * policy checking, and creates the name of the coredump;
3312 * then it passes on a vnode and a size limit to the process-specific
3313 * coredump routine if there is one; if there _is not_ one, it returns
3314 * ENOSYS; otherwise it returns the error from the process-specific routine.
3318 coredump(struct thread *td)
3320 struct proc *p = td->td_proc;
3321 struct ucred *cred = td->td_ucred;
3325 int error, error1, locked;
3327 char *name; /* name of corefile */
3331 #ifdef COMPRESS_USER_CORES
3332 compress = compress_user_cores;
3336 PROC_LOCK_ASSERT(p, MA_OWNED);
3337 MPASS((p->p_flag & P_HADTHREADS) == 0 || p->p_singlethread == td);
3338 _STOPEVENT(p, S_CORE, 0);
3340 if (!do_coredump || (!sugid_coredump && (p->p_flag & P_SUGID) != 0) ||
3341 (p->p_flag2 & P2_NOTRACE) != 0) {
3347 * Note that the bulk of limit checking is done after
3348 * the corefile is created. The exception is if the limit
3349 * for corefiles is 0, in which case we don't bother
3350 * creating the corefile at all. This layout means that
3351 * a corefile is truncated instead of not being created,
3352 * if it is larger than the limit.
3354 limit = (off_t)lim_cur(p, RLIMIT_CORE);
3355 if (limit == 0 || racct_get_available(p, RACCT_CORE) == 0) {
3362 error = corefile_open(p->p_comm, cred->cr_uid, p->p_pid, td, compress,
3367 /* Don't dump to non-regular files or files with links. */
3368 if (vp->v_type != VREG || VOP_GETATTR(vp, &vattr, cred) != 0 ||
3369 vattr.va_nlink != 1) {
3376 lf.l_whence = SEEK_SET;
3379 lf.l_type = F_WRLCK;
3380 locked = (VOP_ADVLOCK(vp, (caddr_t)p, F_SETLK, &lf, F_FLOCK) == 0);
3382 if (vn_start_write(vp, &mp, V_NOWAIT) != 0) {
3383 lf.l_type = F_UNLCK;
3385 VOP_ADVLOCK(vp, (caddr_t)p, F_UNLCK, &lf, F_FLOCK);
3386 if ((error = vn_close(vp, FWRITE, cred, td)) != 0)
3388 if ((error = vn_start_write(NULL, &mp, V_XSLEEP | PCATCH)) != 0)
3396 if (set_core_nodump_flag)
3397 vattr.va_flags = UF_NODUMP;
3398 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
3399 VOP_SETATTR(vp, &vattr, cred);
3401 vn_finished_write(mp);
3403 p->p_acflag |= ACORE;
3406 if (p->p_sysent->sv_coredump != NULL) {
3407 error = p->p_sysent->sv_coredump(td, vp, limit,
3408 compress ? IMGACT_CORE_COMPRESS : 0);
3414 lf.l_type = F_UNLCK;
3415 VOP_ADVLOCK(vp, (caddr_t)p, F_UNLCK, &lf, F_FLOCK);
3418 error1 = vn_close(vp, FWRITE, cred, td);
3423 audit_proc_coredump(td, name, error);
3430 * Nonexistent system call-- signal process (may want to handle it). Flag
3431 * error in case process won't see signal immediately (blocked or ignored).
3433 #ifndef _SYS_SYSPROTO_H_
3442 struct nosys_args *args;
3444 struct proc *p = td->td_proc;
3447 tdsignal(td, SIGSYS);
3453 * Send a SIGIO or SIGURG signal to a process or process group using stored
3454 * credentials rather than those of the current process.
3457 pgsigio(sigiop, sig, checkctty)
3458 struct sigio **sigiop;
3462 struct sigio *sigio;
3464 ksiginfo_init(&ksi);
3465 ksi.ksi_signo = sig;
3466 ksi.ksi_code = SI_KERNEL;
3470 if (sigio == NULL) {
3474 if (sigio->sio_pgid > 0) {
3475 PROC_LOCK(sigio->sio_proc);
3476 if (CANSIGIO(sigio->sio_ucred, sigio->sio_proc->p_ucred))
3477 kern_psignal(sigio->sio_proc, sig);
3478 PROC_UNLOCK(sigio->sio_proc);
3479 } else if (sigio->sio_pgid < 0) {
3482 PGRP_LOCK(sigio->sio_pgrp);
3483 LIST_FOREACH(p, &sigio->sio_pgrp->pg_members, p_pglist) {
3485 if (p->p_state == PRS_NORMAL &&
3486 CANSIGIO(sigio->sio_ucred, p->p_ucred) &&
3487 (checkctty == 0 || (p->p_flag & P_CONTROLT)))
3488 kern_psignal(p, sig);
3491 PGRP_UNLOCK(sigio->sio_pgrp);
3497 filt_sigattach(struct knote *kn)
3499 struct proc *p = curproc;
3501 kn->kn_ptr.p_proc = p;
3502 kn->kn_flags |= EV_CLEAR; /* automatically set */
3504 knlist_add(&p->p_klist, kn, 0);
3510 filt_sigdetach(struct knote *kn)
3512 struct proc *p = kn->kn_ptr.p_proc;
3514 knlist_remove(&p->p_klist, kn, 0);
3518 * signal knotes are shared with proc knotes, so we apply a mask to
3519 * the hint in order to differentiate them from process hints. This
3520 * could be avoided by using a signal-specific knote list, but probably
3521 * isn't worth the trouble.
3524 filt_signal(struct knote *kn, long hint)
3527 if (hint & NOTE_SIGNAL) {
3528 hint &= ~NOTE_SIGNAL;
3530 if (kn->kn_id == hint)
3533 return (kn->kn_data != 0);
3541 ps = malloc(sizeof(struct sigacts), M_SUBPROC, M_WAITOK | M_ZERO);
3543 mtx_init(&ps->ps_mtx, "sigacts", NULL, MTX_DEF);
3548 sigacts_free(struct sigacts *ps)
3551 if (refcount_release(&ps->ps_refcnt) == 0)
3553 mtx_destroy(&ps->ps_mtx);
3554 free(ps, M_SUBPROC);
3558 sigacts_hold(struct sigacts *ps)
3561 refcount_acquire(&ps->ps_refcnt);
3566 sigacts_copy(struct sigacts *dest, struct sigacts *src)
3569 KASSERT(dest->ps_refcnt == 1, ("sigacts_copy to shared dest"));
3570 mtx_lock(&src->ps_mtx);
3571 bcopy(src, dest, offsetof(struct sigacts, ps_refcnt));
3572 mtx_unlock(&src->ps_mtx);
3576 sigacts_shared(struct sigacts *ps)
3579 return (ps->ps_refcnt > 1);