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
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8 * the permission of UNIX System Laboratories, Inc.
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13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
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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_kdtrace.h"
42 #include "opt_ktrace.h"
45 #include <sys/param.h>
46 #include <sys/systm.h>
47 #include <sys/signalvar.h>
48 #include <sys/vnode.h>
50 #include <sys/condvar.h>
51 #include <sys/event.h>
52 #include <sys/fcntl.h>
53 #include <sys/imgact.h>
54 #include <sys/kernel.h>
56 #include <sys/ktrace.h>
58 #include <sys/malloc.h>
59 #include <sys/mutex.h>
60 #include <sys/namei.h>
62 #include <sys/posix4.h>
63 #include <sys/pioctl.h>
64 #include <sys/resourcevar.h>
67 #include <sys/sleepqueue.h>
71 #include <sys/syscallsubr.h>
72 #include <sys/sysctl.h>
73 #include <sys/sysent.h>
74 #include <sys/syslog.h>
75 #include <sys/sysproto.h>
76 #include <sys/timers.h>
77 #include <sys/unistd.h>
80 #include <vm/vm_extern.h>
85 #include <machine/cpu.h>
87 #include <security/audit/audit.h>
89 #define ONSIG 32 /* NSIG for osig* syscalls. XXX. */
91 SDT_PROVIDER_DECLARE(proc);
92 SDT_PROBE_DEFINE(proc, kernel, , signal_send, signal-send);
93 SDT_PROBE_ARGTYPE(proc, kernel, , signal_send, 0, "struct thread *");
94 SDT_PROBE_ARGTYPE(proc, kernel, , signal_send, 1, "struct proc *");
95 SDT_PROBE_ARGTYPE(proc, kernel, , signal_send, 2, "int");
96 SDT_PROBE_DEFINE(proc, kernel, , signal_clear, signal-clear);
97 SDT_PROBE_ARGTYPE(proc, kernel, , signal_clear, 0, "int");
98 SDT_PROBE_ARGTYPE(proc, kernel, , signal_clear, 1, "ksiginfo_t *");
99 SDT_PROBE_DEFINE(proc, kernel, , signal_discard, signal-discard);
100 SDT_PROBE_ARGTYPE(proc, kernel, , signal_discard, 0, "struct thread *");
101 SDT_PROBE_ARGTYPE(proc, kernel, , signal_discard, 1, "struct proc *");
102 SDT_PROBE_ARGTYPE(proc, kernel, , signal_discard, 2, "int");
104 static int coredump(struct thread *);
105 static char *expand_name(const char *, uid_t, pid_t, struct thread *, int);
106 static int killpg1(struct thread *td, int sig, int pgid, int all,
108 static int issignal(struct thread *td, int stop_allowed);
109 static int sigprop(int sig);
110 static void tdsigwakeup(struct thread *, int, sig_t, int);
111 static void sig_suspend_threads(struct thread *, struct proc *, int);
112 static int filt_sigattach(struct knote *kn);
113 static void filt_sigdetach(struct knote *kn);
114 static int filt_signal(struct knote *kn, long hint);
115 static struct thread *sigtd(struct proc *p, int sig, int prop);
116 static void sigqueue_start(void);
118 static uma_zone_t ksiginfo_zone = NULL;
119 struct filterops sig_filtops = {
121 .f_attach = filt_sigattach,
122 .f_detach = filt_sigdetach,
123 .f_event = filt_signal,
126 static int kern_logsigexit = 1;
127 SYSCTL_INT(_kern, KERN_LOGSIGEXIT, logsigexit, CTLFLAG_RW,
129 "Log processes quitting on abnormal signals to syslog(3)");
131 static int kern_forcesigexit = 1;
132 SYSCTL_INT(_kern, OID_AUTO, forcesigexit, CTLFLAG_RW,
133 &kern_forcesigexit, 0, "Force trap signal to be handled");
135 SYSCTL_NODE(_kern, OID_AUTO, sigqueue, CTLFLAG_RW, 0, "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 SYSCTL_INT(_kern, OID_AUTO, sugid_coredump, CTLFLAG_RW,
170 &sugid_coredump, 0, "Allow setuid and setgid processes to dump core");
172 static int do_coredump = 1;
173 SYSCTL_INT(_kern, OID_AUTO, coredump, CTLFLAG_RW,
174 &do_coredump, 0, "Enable/Disable coredumps");
176 static int set_core_nodump_flag = 0;
177 SYSCTL_INT(_kern, OID_AUTO, nodump_coredump, CTLFLAG_RW, &set_core_nodump_flag,
178 0, "Enable setting the NODUMP flag on coredump files");
181 * Signal properties and actions.
182 * The array below categorizes the signals and their default actions
183 * according to the following properties:
185 #define SA_KILL 0x01 /* terminates process by default */
186 #define SA_CORE 0x02 /* ditto and coredumps */
187 #define SA_STOP 0x04 /* suspend process */
188 #define SA_TTYSTOP 0x08 /* ditto, from tty */
189 #define SA_IGNORE 0x10 /* ignore by default */
190 #define SA_CONT 0x20 /* continue if suspended */
191 #define SA_CANTMASK 0x40 /* non-maskable, catchable */
192 #define SA_PROC 0x80 /* deliverable to any thread */
194 static int sigproptbl[NSIG] = {
195 SA_KILL|SA_PROC, /* SIGHUP */
196 SA_KILL|SA_PROC, /* SIGINT */
197 SA_KILL|SA_CORE|SA_PROC, /* SIGQUIT */
198 SA_KILL|SA_CORE, /* SIGILL */
199 SA_KILL|SA_CORE, /* SIGTRAP */
200 SA_KILL|SA_CORE, /* SIGABRT */
201 SA_KILL|SA_CORE|SA_PROC, /* SIGEMT */
202 SA_KILL|SA_CORE, /* SIGFPE */
203 SA_KILL|SA_PROC, /* SIGKILL */
204 SA_KILL|SA_CORE, /* SIGBUS */
205 SA_KILL|SA_CORE, /* SIGSEGV */
206 SA_KILL|SA_CORE, /* SIGSYS */
207 SA_KILL|SA_PROC, /* SIGPIPE */
208 SA_KILL|SA_PROC, /* SIGALRM */
209 SA_KILL|SA_PROC, /* SIGTERM */
210 SA_IGNORE|SA_PROC, /* SIGURG */
211 SA_STOP|SA_PROC, /* SIGSTOP */
212 SA_STOP|SA_TTYSTOP|SA_PROC, /* SIGTSTP */
213 SA_IGNORE|SA_CONT|SA_PROC, /* SIGCONT */
214 SA_IGNORE|SA_PROC, /* SIGCHLD */
215 SA_STOP|SA_TTYSTOP|SA_PROC, /* SIGTTIN */
216 SA_STOP|SA_TTYSTOP|SA_PROC, /* SIGTTOU */
217 SA_IGNORE|SA_PROC, /* SIGIO */
218 SA_KILL, /* SIGXCPU */
219 SA_KILL, /* SIGXFSZ */
220 SA_KILL|SA_PROC, /* SIGVTALRM */
221 SA_KILL|SA_PROC, /* SIGPROF */
222 SA_IGNORE|SA_PROC, /* SIGWINCH */
223 SA_IGNORE|SA_PROC, /* SIGINFO */
224 SA_KILL|SA_PROC, /* SIGUSR1 */
225 SA_KILL|SA_PROC, /* SIGUSR2 */
228 static void reschedule_signals(struct proc *p, sigset_t block, int flags);
233 ksiginfo_zone = uma_zcreate("ksiginfo", sizeof(ksiginfo_t),
234 NULL, NULL, NULL, NULL, UMA_ALIGN_PTR, 0);
235 uma_prealloc(ksiginfo_zone, preallocate_siginfo);
236 p31b_setcfg(CTL_P1003_1B_REALTIME_SIGNALS, _POSIX_REALTIME_SIGNALS);
237 p31b_setcfg(CTL_P1003_1B_RTSIG_MAX, SIGRTMAX - SIGRTMIN + 1);
238 p31b_setcfg(CTL_P1003_1B_SIGQUEUE_MAX, max_pending_per_proc);
242 ksiginfo_alloc(int wait)
249 if (ksiginfo_zone != NULL)
250 return ((ksiginfo_t *)uma_zalloc(ksiginfo_zone, flags));
255 ksiginfo_free(ksiginfo_t *ksi)
257 uma_zfree(ksiginfo_zone, ksi);
261 ksiginfo_tryfree(ksiginfo_t *ksi)
263 if (!(ksi->ksi_flags & KSI_EXT)) {
264 uma_zfree(ksiginfo_zone, ksi);
271 sigqueue_init(sigqueue_t *list, struct proc *p)
273 SIGEMPTYSET(list->sq_signals);
274 SIGEMPTYSET(list->sq_kill);
275 TAILQ_INIT(&list->sq_list);
277 list->sq_flags = SQ_INIT;
281 * Get a signal's ksiginfo.
283 * 0 - signal not found
284 * others - signal number
287 sigqueue_get(sigqueue_t *sq, int signo, ksiginfo_t *si)
289 struct proc *p = sq->sq_proc;
290 struct ksiginfo *ksi, *next;
293 KASSERT(sq->sq_flags & SQ_INIT, ("sigqueue not inited"));
295 if (!SIGISMEMBER(sq->sq_signals, signo))
298 if (SIGISMEMBER(sq->sq_kill, signo)) {
300 SIGDELSET(sq->sq_kill, signo);
303 TAILQ_FOREACH_SAFE(ksi, &sq->sq_list, ksi_link, next) {
304 if (ksi->ksi_signo == signo) {
306 TAILQ_REMOVE(&sq->sq_list, ksi, ksi_link);
307 ksi->ksi_sigq = NULL;
308 ksiginfo_copy(ksi, si);
309 if (ksiginfo_tryfree(ksi) && p != NULL)
318 SIGDELSET(sq->sq_signals, signo);
319 si->ksi_signo = signo;
324 sigqueue_take(ksiginfo_t *ksi)
330 if (ksi == NULL || (sq = ksi->ksi_sigq) == NULL)
334 TAILQ_REMOVE(&sq->sq_list, ksi, ksi_link);
335 ksi->ksi_sigq = NULL;
336 if (!(ksi->ksi_flags & KSI_EXT) && p != NULL)
339 for (kp = TAILQ_FIRST(&sq->sq_list); kp != NULL;
340 kp = TAILQ_NEXT(kp, ksi_link)) {
341 if (kp->ksi_signo == ksi->ksi_signo)
344 if (kp == NULL && !SIGISMEMBER(sq->sq_kill, ksi->ksi_signo))
345 SIGDELSET(sq->sq_signals, ksi->ksi_signo);
349 sigqueue_add(sigqueue_t *sq, int signo, ksiginfo_t *si)
351 struct proc *p = sq->sq_proc;
352 struct ksiginfo *ksi;
355 KASSERT(sq->sq_flags & SQ_INIT, ("sigqueue not inited"));
357 if (signo == SIGKILL || signo == SIGSTOP || si == NULL) {
358 SIGADDSET(sq->sq_kill, signo);
362 /* directly insert the ksi, don't copy it */
363 if (si->ksi_flags & KSI_INS) {
364 if (si->ksi_flags & KSI_HEAD)
365 TAILQ_INSERT_HEAD(&sq->sq_list, si, ksi_link);
367 TAILQ_INSERT_TAIL(&sq->sq_list, si, ksi_link);
372 if (__predict_false(ksiginfo_zone == NULL)) {
373 SIGADDSET(sq->sq_kill, signo);
377 if (p != NULL && p->p_pendingcnt >= max_pending_per_proc) {
380 } else if ((ksi = ksiginfo_alloc(0)) == NULL) {
386 ksiginfo_copy(si, ksi);
387 ksi->ksi_signo = signo;
388 if (si->ksi_flags & KSI_HEAD)
389 TAILQ_INSERT_HEAD(&sq->sq_list, ksi, ksi_link);
391 TAILQ_INSERT_TAIL(&sq->sq_list, ksi, ksi_link);
395 if ((si->ksi_flags & KSI_TRAP) != 0 ||
396 (si->ksi_flags & KSI_SIGQ) == 0) {
398 SIGADDSET(sq->sq_kill, signo);
407 SIGADDSET(sq->sq_signals, signo);
412 sigqueue_flush(sigqueue_t *sq)
414 struct proc *p = sq->sq_proc;
417 KASSERT(sq->sq_flags & SQ_INIT, ("sigqueue not inited"));
420 PROC_LOCK_ASSERT(p, MA_OWNED);
422 while ((ksi = TAILQ_FIRST(&sq->sq_list)) != NULL) {
423 TAILQ_REMOVE(&sq->sq_list, ksi, ksi_link);
424 ksi->ksi_sigq = NULL;
425 if (ksiginfo_tryfree(ksi) && p != NULL)
429 SIGEMPTYSET(sq->sq_signals);
430 SIGEMPTYSET(sq->sq_kill);
434 sigqueue_move_set(sigqueue_t *src, sigqueue_t *dst, const sigset_t *set)
437 struct proc *p1, *p2;
438 ksiginfo_t *ksi, *next;
440 KASSERT(src->sq_flags & SQ_INIT, ("src sigqueue not inited"));
441 KASSERT(dst->sq_flags & SQ_INIT, ("dst sigqueue not inited"));
444 /* Move siginfo to target list */
445 TAILQ_FOREACH_SAFE(ksi, &src->sq_list, ksi_link, next) {
446 if (SIGISMEMBER(*set, ksi->ksi_signo)) {
447 TAILQ_REMOVE(&src->sq_list, ksi, ksi_link);
450 TAILQ_INSERT_TAIL(&dst->sq_list, ksi, ksi_link);
457 /* Move pending bits to target list */
459 SIGSETAND(tmp, *set);
460 SIGSETOR(dst->sq_kill, tmp);
461 SIGSETNAND(src->sq_kill, tmp);
463 tmp = src->sq_signals;
464 SIGSETAND(tmp, *set);
465 SIGSETOR(dst->sq_signals, tmp);
466 SIGSETNAND(src->sq_signals, tmp);
471 sigqueue_move(sigqueue_t *src, sigqueue_t *dst, int signo)
476 SIGADDSET(set, signo);
477 sigqueue_move_set(src, dst, &set);
482 sigqueue_delete_set(sigqueue_t *sq, const sigset_t *set)
484 struct proc *p = sq->sq_proc;
485 ksiginfo_t *ksi, *next;
487 KASSERT(sq->sq_flags & SQ_INIT, ("src sigqueue not inited"));
489 /* Remove siginfo queue */
490 TAILQ_FOREACH_SAFE(ksi, &sq->sq_list, ksi_link, next) {
491 if (SIGISMEMBER(*set, ksi->ksi_signo)) {
492 TAILQ_REMOVE(&sq->sq_list, ksi, ksi_link);
493 ksi->ksi_sigq = NULL;
494 if (ksiginfo_tryfree(ksi) && p != NULL)
498 SIGSETNAND(sq->sq_kill, *set);
499 SIGSETNAND(sq->sq_signals, *set);
503 sigqueue_delete(sigqueue_t *sq, int signo)
508 SIGADDSET(set, signo);
509 sigqueue_delete_set(sq, &set);
512 /* Remove a set of signals for a process */
514 sigqueue_delete_set_proc(struct proc *p, const sigset_t *set)
519 PROC_LOCK_ASSERT(p, MA_OWNED);
521 sigqueue_init(&worklist, NULL);
522 sigqueue_move_set(&p->p_sigqueue, &worklist, set);
524 FOREACH_THREAD_IN_PROC(p, td0)
525 sigqueue_move_set(&td0->td_sigqueue, &worklist, set);
527 sigqueue_flush(&worklist);
531 sigqueue_delete_proc(struct proc *p, int signo)
536 SIGADDSET(set, signo);
537 sigqueue_delete_set_proc(p, &set);
541 sigqueue_delete_stopmask_proc(struct proc *p)
546 SIGADDSET(set, SIGSTOP);
547 SIGADDSET(set, SIGTSTP);
548 SIGADDSET(set, SIGTTIN);
549 SIGADDSET(set, SIGTTOU);
550 sigqueue_delete_set_proc(p, &set);
554 * Determine signal that should be delivered to process p, the current
555 * process, 0 if none. If there is a pending stop signal with default
556 * action, the process stops in issignal().
559 cursig(struct thread *td, int stop_allowed)
561 PROC_LOCK_ASSERT(td->td_proc, MA_OWNED);
562 KASSERT(stop_allowed == SIG_STOP_ALLOWED ||
563 stop_allowed == SIG_STOP_NOT_ALLOWED, ("cursig: stop_allowed"));
564 mtx_assert(&td->td_proc->p_sigacts->ps_mtx, MA_OWNED);
565 THREAD_LOCK_ASSERT(td, MA_NOTOWNED);
566 return (SIGPENDING(td) ? issignal(td, stop_allowed) : 0);
570 * Arrange for ast() to handle unmasked pending signals on return to user
571 * mode. This must be called whenever a signal is added to td_sigqueue or
572 * unmasked in td_sigmask.
575 signotify(struct thread *td)
581 PROC_LOCK_ASSERT(p, MA_OWNED);
583 if (SIGPENDING(td)) {
585 td->td_flags |= TDF_NEEDSIGCHK | TDF_ASTPENDING;
591 sigonstack(size_t sp)
593 struct thread *td = curthread;
595 return ((td->td_pflags & TDP_ALTSTACK) ?
596 #if defined(COMPAT_43)
597 ((td->td_sigstk.ss_size == 0) ?
598 (td->td_sigstk.ss_flags & SS_ONSTACK) :
599 ((sp - (size_t)td->td_sigstk.ss_sp) < td->td_sigstk.ss_size))
601 ((sp - (size_t)td->td_sigstk.ss_sp) < td->td_sigstk.ss_size)
610 if (sig > 0 && sig < NSIG)
611 return (sigproptbl[_SIG_IDX(sig)]);
616 sig_ffs(sigset_t *set)
620 for (i = 0; i < _SIG_WORDS; i++)
622 return (ffs(set->__bits[i]) + (i * 32));
633 kern_sigaction(td, sig, act, oact, flags)
636 struct sigaction *act, *oact;
640 struct proc *p = td->td_proc;
642 if (!_SIG_VALID(sig))
647 mtx_lock(&ps->ps_mtx);
649 oact->sa_mask = ps->ps_catchmask[_SIG_IDX(sig)];
651 if (SIGISMEMBER(ps->ps_sigonstack, sig))
652 oact->sa_flags |= SA_ONSTACK;
653 if (!SIGISMEMBER(ps->ps_sigintr, sig))
654 oact->sa_flags |= SA_RESTART;
655 if (SIGISMEMBER(ps->ps_sigreset, sig))
656 oact->sa_flags |= SA_RESETHAND;
657 if (SIGISMEMBER(ps->ps_signodefer, sig))
658 oact->sa_flags |= SA_NODEFER;
659 if (SIGISMEMBER(ps->ps_siginfo, sig)) {
660 oact->sa_flags |= SA_SIGINFO;
662 (__siginfohandler_t *)ps->ps_sigact[_SIG_IDX(sig)];
664 oact->sa_handler = ps->ps_sigact[_SIG_IDX(sig)];
665 if (sig == SIGCHLD && ps->ps_flag & PS_NOCLDSTOP)
666 oact->sa_flags |= SA_NOCLDSTOP;
667 if (sig == SIGCHLD && ps->ps_flag & PS_NOCLDWAIT)
668 oact->sa_flags |= SA_NOCLDWAIT;
671 if ((sig == SIGKILL || sig == SIGSTOP) &&
672 act->sa_handler != SIG_DFL) {
673 mtx_unlock(&ps->ps_mtx);
679 * Change setting atomically.
682 ps->ps_catchmask[_SIG_IDX(sig)] = act->sa_mask;
683 SIG_CANTMASK(ps->ps_catchmask[_SIG_IDX(sig)]);
684 if (act->sa_flags & SA_SIGINFO) {
685 ps->ps_sigact[_SIG_IDX(sig)] =
686 (__sighandler_t *)act->sa_sigaction;
687 SIGADDSET(ps->ps_siginfo, sig);
689 ps->ps_sigact[_SIG_IDX(sig)] = act->sa_handler;
690 SIGDELSET(ps->ps_siginfo, sig);
692 if (!(act->sa_flags & SA_RESTART))
693 SIGADDSET(ps->ps_sigintr, sig);
695 SIGDELSET(ps->ps_sigintr, sig);
696 if (act->sa_flags & SA_ONSTACK)
697 SIGADDSET(ps->ps_sigonstack, sig);
699 SIGDELSET(ps->ps_sigonstack, sig);
700 if (act->sa_flags & SA_RESETHAND)
701 SIGADDSET(ps->ps_sigreset, sig);
703 SIGDELSET(ps->ps_sigreset, sig);
704 if (act->sa_flags & SA_NODEFER)
705 SIGADDSET(ps->ps_signodefer, sig);
707 SIGDELSET(ps->ps_signodefer, sig);
708 if (sig == SIGCHLD) {
709 if (act->sa_flags & SA_NOCLDSTOP)
710 ps->ps_flag |= PS_NOCLDSTOP;
712 ps->ps_flag &= ~PS_NOCLDSTOP;
713 if (act->sa_flags & SA_NOCLDWAIT) {
715 * Paranoia: since SA_NOCLDWAIT is implemented
716 * by reparenting the dying child to PID 1 (and
717 * trust it to reap the zombie), PID 1 itself
718 * is forbidden to set SA_NOCLDWAIT.
721 ps->ps_flag &= ~PS_NOCLDWAIT;
723 ps->ps_flag |= PS_NOCLDWAIT;
725 ps->ps_flag &= ~PS_NOCLDWAIT;
726 if (ps->ps_sigact[_SIG_IDX(SIGCHLD)] == SIG_IGN)
727 ps->ps_flag |= PS_CLDSIGIGN;
729 ps->ps_flag &= ~PS_CLDSIGIGN;
732 * Set bit in ps_sigignore for signals that are set to SIG_IGN,
733 * and for signals set to SIG_DFL where the default is to
734 * ignore. However, don't put SIGCONT in ps_sigignore, as we
735 * have to restart the process.
737 if (ps->ps_sigact[_SIG_IDX(sig)] == SIG_IGN ||
738 (sigprop(sig) & SA_IGNORE &&
739 ps->ps_sigact[_SIG_IDX(sig)] == SIG_DFL)) {
740 /* never to be seen again */
741 sigqueue_delete_proc(p, sig);
743 /* easier in psignal */
744 SIGADDSET(ps->ps_sigignore, sig);
745 SIGDELSET(ps->ps_sigcatch, sig);
747 SIGDELSET(ps->ps_sigignore, sig);
748 if (ps->ps_sigact[_SIG_IDX(sig)] == SIG_DFL)
749 SIGDELSET(ps->ps_sigcatch, sig);
751 SIGADDSET(ps->ps_sigcatch, sig);
753 #ifdef COMPAT_FREEBSD4
754 if (ps->ps_sigact[_SIG_IDX(sig)] == SIG_IGN ||
755 ps->ps_sigact[_SIG_IDX(sig)] == SIG_DFL ||
756 (flags & KSA_FREEBSD4) == 0)
757 SIGDELSET(ps->ps_freebsd4, sig);
759 SIGADDSET(ps->ps_freebsd4, sig);
762 if (ps->ps_sigact[_SIG_IDX(sig)] == SIG_IGN ||
763 ps->ps_sigact[_SIG_IDX(sig)] == SIG_DFL ||
764 (flags & KSA_OSIGSET) == 0)
765 SIGDELSET(ps->ps_osigset, sig);
767 SIGADDSET(ps->ps_osigset, sig);
770 mtx_unlock(&ps->ps_mtx);
775 #ifndef _SYS_SYSPROTO_H_
776 struct sigaction_args {
778 struct sigaction *act;
779 struct sigaction *oact;
785 register struct sigaction_args *uap;
787 struct sigaction act, oact;
788 register struct sigaction *actp, *oactp;
791 actp = (uap->act != NULL) ? &act : NULL;
792 oactp = (uap->oact != NULL) ? &oact : NULL;
794 error = copyin(uap->act, actp, sizeof(act));
798 error = kern_sigaction(td, uap->sig, actp, oactp, 0);
800 error = copyout(oactp, uap->oact, sizeof(oact));
804 #ifdef COMPAT_FREEBSD4
805 #ifndef _SYS_SYSPROTO_H_
806 struct freebsd4_sigaction_args {
808 struct sigaction *act;
809 struct sigaction *oact;
813 freebsd4_sigaction(td, uap)
815 register struct freebsd4_sigaction_args *uap;
817 struct sigaction act, oact;
818 register struct sigaction *actp, *oactp;
822 actp = (uap->act != NULL) ? &act : NULL;
823 oactp = (uap->oact != NULL) ? &oact : NULL;
825 error = copyin(uap->act, actp, sizeof(act));
829 error = kern_sigaction(td, uap->sig, actp, oactp, KSA_FREEBSD4);
831 error = copyout(oactp, uap->oact, sizeof(oact));
834 #endif /* COMAPT_FREEBSD4 */
836 #ifdef COMPAT_43 /* XXX - COMPAT_FBSD3 */
837 #ifndef _SYS_SYSPROTO_H_
838 struct osigaction_args {
840 struct osigaction *nsa;
841 struct osigaction *osa;
847 register struct osigaction_args *uap;
849 struct osigaction sa;
850 struct sigaction nsa, osa;
851 register struct sigaction *nsap, *osap;
854 if (uap->signum <= 0 || uap->signum >= ONSIG)
857 nsap = (uap->nsa != NULL) ? &nsa : NULL;
858 osap = (uap->osa != NULL) ? &osa : NULL;
861 error = copyin(uap->nsa, &sa, sizeof(sa));
864 nsap->sa_handler = sa.sa_handler;
865 nsap->sa_flags = sa.sa_flags;
866 OSIG2SIG(sa.sa_mask, nsap->sa_mask);
868 error = kern_sigaction(td, uap->signum, nsap, osap, KSA_OSIGSET);
869 if (osap && !error) {
870 sa.sa_handler = osap->sa_handler;
871 sa.sa_flags = osap->sa_flags;
872 SIG2OSIG(osap->sa_mask, sa.sa_mask);
873 error = copyout(&sa, uap->osa, sizeof(sa));
878 #if !defined(__i386__)
879 /* Avoid replicating the same stub everywhere */
883 struct osigreturn_args *uap;
886 return (nosys(td, (struct nosys_args *)uap));
889 #endif /* COMPAT_43 */
892 * Initialize signal state for process 0;
893 * set to ignore signals that are ignored by default.
904 mtx_lock(&ps->ps_mtx);
905 for (i = 1; i <= NSIG; i++)
906 if (sigprop(i) & SA_IGNORE && i != SIGCONT)
907 SIGADDSET(ps->ps_sigignore, i);
908 mtx_unlock(&ps->ps_mtx);
913 * Reset signals for an exec of the specified process.
916 execsigs(struct proc *p)
923 * Reset caught signals. Held signals remain held
924 * through td_sigmask (unless they were caught,
925 * and are now ignored by default).
927 PROC_LOCK_ASSERT(p, MA_OWNED);
928 td = FIRST_THREAD_IN_PROC(p);
930 mtx_lock(&ps->ps_mtx);
931 while (SIGNOTEMPTY(ps->ps_sigcatch)) {
932 sig = sig_ffs(&ps->ps_sigcatch);
933 SIGDELSET(ps->ps_sigcatch, sig);
934 if (sigprop(sig) & SA_IGNORE) {
936 SIGADDSET(ps->ps_sigignore, sig);
937 sigqueue_delete_proc(p, sig);
939 ps->ps_sigact[_SIG_IDX(sig)] = SIG_DFL;
942 * Reset stack state to the user stack.
943 * Clear set of signals caught on the signal stack.
945 td->td_sigstk.ss_flags = SS_DISABLE;
946 td->td_sigstk.ss_size = 0;
947 td->td_sigstk.ss_sp = 0;
948 td->td_pflags &= ~TDP_ALTSTACK;
950 * Reset no zombies if child dies flag as Solaris does.
952 ps->ps_flag &= ~(PS_NOCLDWAIT | PS_CLDSIGIGN);
953 if (ps->ps_sigact[_SIG_IDX(SIGCHLD)] == SIG_IGN)
954 ps->ps_sigact[_SIG_IDX(SIGCHLD)] = SIG_DFL;
955 mtx_unlock(&ps->ps_mtx);
961 * Manipulate signal mask.
964 kern_sigprocmask(struct thread *td, int how, sigset_t *set, sigset_t *oset,
967 sigset_t new_block, oset1;
972 if (!(flags & SIGPROCMASK_PROC_LOCKED))
975 *oset = td->td_sigmask;
982 oset1 = td->td_sigmask;
983 SIGSETOR(td->td_sigmask, *set);
984 new_block = td->td_sigmask;
985 SIGSETNAND(new_block, oset1);
988 SIGSETNAND(td->td_sigmask, *set);
993 oset1 = td->td_sigmask;
994 if (flags & SIGPROCMASK_OLD)
995 SIGSETLO(td->td_sigmask, *set);
997 td->td_sigmask = *set;
998 new_block = td->td_sigmask;
999 SIGSETNAND(new_block, oset1);
1008 * The new_block set contains signals that were not previously
1009 * blocked, but are blocked now.
1011 * In case we block any signal that was not previously blocked
1012 * for td, and process has the signal pending, try to schedule
1013 * signal delivery to some thread that does not block the
1014 * signal, possibly waking it up.
1016 if (p->p_numthreads != 1)
1017 reschedule_signals(p, new_block, flags);
1021 if (!(flags & SIGPROCMASK_PROC_LOCKED))
1026 #ifndef _SYS_SYSPROTO_H_
1027 struct sigprocmask_args {
1029 const sigset_t *set;
1034 sigprocmask(td, uap)
1035 register struct thread *td;
1036 struct sigprocmask_args *uap;
1039 sigset_t *setp, *osetp;
1042 setp = (uap->set != NULL) ? &set : NULL;
1043 osetp = (uap->oset != NULL) ? &oset : NULL;
1045 error = copyin(uap->set, setp, sizeof(set));
1049 error = kern_sigprocmask(td, uap->how, setp, osetp, 0);
1050 if (osetp && !error) {
1051 error = copyout(osetp, uap->oset, sizeof(oset));
1056 #ifdef COMPAT_43 /* XXX - COMPAT_FBSD3 */
1057 #ifndef _SYS_SYSPROTO_H_
1058 struct osigprocmask_args {
1064 osigprocmask(td, uap)
1065 register struct thread *td;
1066 struct osigprocmask_args *uap;
1071 OSIG2SIG(uap->mask, set);
1072 error = kern_sigprocmask(td, uap->how, &set, &oset, 1);
1073 SIG2OSIG(oset, td->td_retval[0]);
1076 #endif /* COMPAT_43 */
1079 sigwait(struct thread *td, struct sigwait_args *uap)
1085 error = copyin(uap->set, &set, sizeof(set));
1087 td->td_retval[0] = error;
1091 error = kern_sigtimedwait(td, set, &ksi, NULL);
1093 if (error == ERESTART)
1095 td->td_retval[0] = error;
1099 error = copyout(&ksi.ksi_signo, uap->sig, sizeof(ksi.ksi_signo));
1100 td->td_retval[0] = error;
1105 sigtimedwait(struct thread *td, struct sigtimedwait_args *uap)
1108 struct timespec *timeout;
1114 error = copyin(uap->timeout, &ts, sizeof(ts));
1122 error = copyin(uap->set, &set, sizeof(set));
1126 error = kern_sigtimedwait(td, set, &ksi, timeout);
1131 error = copyout(&ksi.ksi_info, uap->info, sizeof(siginfo_t));
1134 td->td_retval[0] = ksi.ksi_signo;
1139 sigwaitinfo(struct thread *td, struct sigwaitinfo_args *uap)
1145 error = copyin(uap->set, &set, sizeof(set));
1149 error = kern_sigtimedwait(td, set, &ksi, NULL);
1154 error = copyout(&ksi.ksi_info, uap->info, sizeof(siginfo_t));
1157 td->td_retval[0] = ksi.ksi_signo;
1162 kern_sigtimedwait(struct thread *td, sigset_t waitset, ksiginfo_t *ksi,
1163 struct timespec *timeout)
1166 sigset_t saved_mask, new_block;
1168 int error, sig, timo, timevalid = 0;
1169 struct timespec rts, ets, ts;
1177 if (timeout != NULL) {
1178 if (timeout->tv_nsec >= 0 && timeout->tv_nsec < 1000000000) {
1180 getnanouptime(&rts);
1182 timespecadd(&ets, timeout);
1186 /* Some signals can not be waited for. */
1187 SIG_CANTMASK(waitset);
1190 saved_mask = td->td_sigmask;
1191 SIGSETNAND(td->td_sigmask, waitset);
1193 mtx_lock(&ps->ps_mtx);
1194 sig = cursig(td, SIG_STOP_ALLOWED);
1195 mtx_unlock(&ps->ps_mtx);
1196 if (sig != 0 && SIGISMEMBER(waitset, sig)) {
1197 if (sigqueue_get(&td->td_sigqueue, sig, ksi) != 0 ||
1198 sigqueue_get(&p->p_sigqueue, sig, ksi) != 0) {
1208 * POSIX says this must be checked after looking for pending
1211 if (timeout != NULL) {
1216 getnanouptime(&rts);
1217 if (timespeccmp(&rts, &ets, >=)) {
1222 timespecsub(&ts, &rts);
1223 TIMESPEC_TO_TIMEVAL(&tv, &ts);
1229 error = msleep(ps, &p->p_mtx, PPAUSE|PCATCH, "sigwait", timo);
1231 if (timeout != NULL) {
1232 if (error == ERESTART) {
1233 /* Timeout can not be restarted. */
1235 } else if (error == EAGAIN) {
1236 /* We will calculate timeout by ourself. */
1242 new_block = saved_mask;
1243 SIGSETNAND(new_block, td->td_sigmask);
1244 td->td_sigmask = saved_mask;
1246 * Fewer signals can be delivered to us, reschedule signal
1249 if (p->p_numthreads != 1)
1250 reschedule_signals(p, new_block, 0);
1253 SDT_PROBE(proc, kernel, , signal_clear, sig, ksi, 0, 0, 0);
1255 if (ksi->ksi_code == SI_TIMER)
1256 itimer_accept(p, ksi->ksi_timerid, ksi);
1259 if (KTRPOINT(td, KTR_PSIG)) {
1262 mtx_lock(&ps->ps_mtx);
1263 action = ps->ps_sigact[_SIG_IDX(sig)];
1264 mtx_unlock(&ps->ps_mtx);
1265 ktrpsig(sig, action, &td->td_sigmask, ksi->ksi_code);
1275 #ifndef _SYS_SYSPROTO_H_
1276 struct sigpending_args {
1283 struct sigpending_args *uap;
1285 struct proc *p = td->td_proc;
1289 pending = p->p_sigqueue.sq_signals;
1290 SIGSETOR(pending, td->td_sigqueue.sq_signals);
1292 return (copyout(&pending, uap->set, sizeof(sigset_t)));
1295 #ifdef COMPAT_43 /* XXX - COMPAT_FBSD3 */
1296 #ifndef _SYS_SYSPROTO_H_
1297 struct osigpending_args {
1302 osigpending(td, uap)
1304 struct osigpending_args *uap;
1306 struct proc *p = td->td_proc;
1310 pending = p->p_sigqueue.sq_signals;
1311 SIGSETOR(pending, td->td_sigqueue.sq_signals);
1313 SIG2OSIG(pending, td->td_retval[0]);
1316 #endif /* COMPAT_43 */
1318 #if defined(COMPAT_43)
1320 * Generalized interface signal handler, 4.3-compatible.
1322 #ifndef _SYS_SYSPROTO_H_
1323 struct osigvec_args {
1333 register struct osigvec_args *uap;
1336 struct sigaction nsa, osa;
1337 register struct sigaction *nsap, *osap;
1340 if (uap->signum <= 0 || uap->signum >= ONSIG)
1342 nsap = (uap->nsv != NULL) ? &nsa : NULL;
1343 osap = (uap->osv != NULL) ? &osa : NULL;
1345 error = copyin(uap->nsv, &vec, sizeof(vec));
1348 nsap->sa_handler = vec.sv_handler;
1349 OSIG2SIG(vec.sv_mask, nsap->sa_mask);
1350 nsap->sa_flags = vec.sv_flags;
1351 nsap->sa_flags ^= SA_RESTART; /* opposite of SV_INTERRUPT */
1353 error = kern_sigaction(td, uap->signum, nsap, osap, KSA_OSIGSET);
1354 if (osap && !error) {
1355 vec.sv_handler = osap->sa_handler;
1356 SIG2OSIG(osap->sa_mask, vec.sv_mask);
1357 vec.sv_flags = osap->sa_flags;
1358 vec.sv_flags &= ~SA_NOCLDWAIT;
1359 vec.sv_flags ^= SA_RESTART;
1360 error = copyout(&vec, uap->osv, sizeof(vec));
1365 #ifndef _SYS_SYSPROTO_H_
1366 struct osigblock_args {
1372 register struct thread *td;
1373 struct osigblock_args *uap;
1377 OSIG2SIG(uap->mask, set);
1378 kern_sigprocmask(td, SIG_BLOCK, &set, &oset, 0);
1379 SIG2OSIG(oset, td->td_retval[0]);
1383 #ifndef _SYS_SYSPROTO_H_
1384 struct osigsetmask_args {
1389 osigsetmask(td, uap)
1391 struct osigsetmask_args *uap;
1395 OSIG2SIG(uap->mask, set);
1396 kern_sigprocmask(td, SIG_SETMASK, &set, &oset, 0);
1397 SIG2OSIG(oset, td->td_retval[0]);
1400 #endif /* COMPAT_43 */
1403 * Suspend calling thread until signal, providing mask to be set in the
1406 #ifndef _SYS_SYSPROTO_H_
1407 struct sigsuspend_args {
1408 const sigset_t *sigmask;
1415 struct sigsuspend_args *uap;
1420 error = copyin(uap->sigmask, &mask, sizeof(mask));
1423 return (kern_sigsuspend(td, mask));
1427 kern_sigsuspend(struct thread *td, sigset_t mask)
1429 struct proc *p = td->td_proc;
1433 * When returning from sigsuspend, we want
1434 * the old mask to be restored after the
1435 * signal handler has finished. Thus, we
1436 * save it here and mark the sigacts structure
1440 kern_sigprocmask(td, SIG_SETMASK, &mask, &td->td_oldsigmask,
1441 SIGPROCMASK_PROC_LOCKED);
1442 td->td_pflags |= TDP_OLDMASK;
1445 * Process signals now. Otherwise, we can get spurious wakeup
1446 * due to signal entered process queue, but delivered to other
1447 * thread. But sigsuspend should return only on signal
1450 (p->p_sysent->sv_set_syscall_retval)(td, EINTR);
1451 for (has_sig = 0; !has_sig;) {
1452 while (msleep(&p->p_sigacts, &p->p_mtx, PPAUSE|PCATCH, "pause",
1455 thread_suspend_check(0);
1456 mtx_lock(&p->p_sigacts->ps_mtx);
1457 while ((sig = cursig(td, SIG_STOP_ALLOWED)) != 0)
1458 has_sig += postsig(sig);
1459 mtx_unlock(&p->p_sigacts->ps_mtx);
1462 return (EJUSTRETURN);
1465 #ifdef COMPAT_43 /* XXX - COMPAT_FBSD3 */
1467 * Compatibility sigsuspend call for old binaries. Note nonstandard calling
1468 * convention: libc stub passes mask, not pointer, to save a copyin.
1470 #ifndef _SYS_SYSPROTO_H_
1471 struct osigsuspend_args {
1477 osigsuspend(td, uap)
1479 struct osigsuspend_args *uap;
1483 OSIG2SIG(uap->mask, mask);
1484 return (kern_sigsuspend(td, mask));
1486 #endif /* COMPAT_43 */
1488 #if defined(COMPAT_43)
1489 #ifndef _SYS_SYSPROTO_H_
1490 struct osigstack_args {
1491 struct sigstack *nss;
1492 struct sigstack *oss;
1499 register struct osigstack_args *uap;
1501 struct sigstack nss, oss;
1504 if (uap->nss != NULL) {
1505 error = copyin(uap->nss, &nss, sizeof(nss));
1509 oss.ss_sp = td->td_sigstk.ss_sp;
1510 oss.ss_onstack = sigonstack(cpu_getstack(td));
1511 if (uap->nss != NULL) {
1512 td->td_sigstk.ss_sp = nss.ss_sp;
1513 td->td_sigstk.ss_size = 0;
1514 td->td_sigstk.ss_flags |= nss.ss_onstack & SS_ONSTACK;
1515 td->td_pflags |= TDP_ALTSTACK;
1517 if (uap->oss != NULL)
1518 error = copyout(&oss, uap->oss, sizeof(oss));
1522 #endif /* COMPAT_43 */
1524 #ifndef _SYS_SYSPROTO_H_
1525 struct sigaltstack_args {
1532 sigaltstack(td, uap)
1534 register struct sigaltstack_args *uap;
1539 if (uap->ss != NULL) {
1540 error = copyin(uap->ss, &ss, sizeof(ss));
1544 error = kern_sigaltstack(td, (uap->ss != NULL) ? &ss : NULL,
1545 (uap->oss != NULL) ? &oss : NULL);
1548 if (uap->oss != NULL)
1549 error = copyout(&oss, uap->oss, sizeof(stack_t));
1554 kern_sigaltstack(struct thread *td, stack_t *ss, stack_t *oss)
1556 struct proc *p = td->td_proc;
1559 oonstack = sigonstack(cpu_getstack(td));
1562 *oss = td->td_sigstk;
1563 oss->ss_flags = (td->td_pflags & TDP_ALTSTACK)
1564 ? ((oonstack) ? SS_ONSTACK : 0) : SS_DISABLE;
1570 if ((ss->ss_flags & ~SS_DISABLE) != 0)
1572 if (!(ss->ss_flags & SS_DISABLE)) {
1573 if (ss->ss_size < p->p_sysent->sv_minsigstksz)
1576 td->td_sigstk = *ss;
1577 td->td_pflags |= TDP_ALTSTACK;
1579 td->td_pflags &= ~TDP_ALTSTACK;
1586 * Common code for kill process group/broadcast kill.
1587 * cp is calling process.
1590 killpg1(struct thread *td, int sig, int pgid, int all, ksiginfo_t *ksi)
1600 sx_slock(&allproc_lock);
1601 FOREACH_PROC_IN_SYSTEM(p) {
1603 if (p->p_pid <= 1 || p->p_flag & P_SYSTEM ||
1604 p == td->td_proc || p->p_state == PRS_NEW) {
1608 if (p_cansignal(td, p, sig) == 0) {
1611 pksignal(p, sig, ksi);
1615 sx_sunlock(&allproc_lock);
1617 sx_slock(&proctree_lock);
1620 * zero pgid means send to my process group.
1622 pgrp = td->td_proc->p_pgrp;
1625 pgrp = pgfind(pgid);
1627 sx_sunlock(&proctree_lock);
1631 sx_sunlock(&proctree_lock);
1632 LIST_FOREACH(p, &pgrp->pg_members, p_pglist) {
1634 if (p->p_pid <= 1 || p->p_flag & P_SYSTEM ||
1635 p->p_state == PRS_NEW) {
1639 if (p_cansignal(td, p, sig) == 0) {
1642 pksignal(p, sig, ksi);
1648 return (nfound ? 0 : ESRCH);
1651 #ifndef _SYS_SYSPROTO_H_
1659 kill(struct thread *td, struct kill_args *uap)
1665 AUDIT_ARG_SIGNUM(uap->signum);
1666 AUDIT_ARG_PID(uap->pid);
1667 if ((u_int)uap->signum > _SIG_MAXSIG)
1670 ksiginfo_init(&ksi);
1671 ksi.ksi_signo = uap->signum;
1672 ksi.ksi_code = SI_USER;
1673 ksi.ksi_pid = td->td_proc->p_pid;
1674 ksi.ksi_uid = td->td_ucred->cr_ruid;
1677 /* kill single process */
1678 if ((p = pfind(uap->pid)) == NULL) {
1679 if ((p = zpfind(uap->pid)) == NULL)
1682 AUDIT_ARG_PROCESS(p);
1683 error = p_cansignal(td, p, uap->signum);
1684 if (error == 0 && uap->signum)
1685 pksignal(p, uap->signum, &ksi);
1690 case -1: /* broadcast signal */
1691 return (killpg1(td, uap->signum, 0, 1, &ksi));
1692 case 0: /* signal own process group */
1693 return (killpg1(td, uap->signum, 0, 0, &ksi));
1694 default: /* negative explicit process group */
1695 return (killpg1(td, uap->signum, -uap->pid, 0, &ksi));
1700 #if defined(COMPAT_43)
1701 #ifndef _SYS_SYSPROTO_H_
1702 struct okillpg_args {
1709 okillpg(struct thread *td, struct okillpg_args *uap)
1713 AUDIT_ARG_SIGNUM(uap->signum);
1714 AUDIT_ARG_PID(uap->pgid);
1715 if ((u_int)uap->signum > _SIG_MAXSIG)
1718 ksiginfo_init(&ksi);
1719 ksi.ksi_signo = uap->signum;
1720 ksi.ksi_code = SI_USER;
1721 ksi.ksi_pid = td->td_proc->p_pid;
1722 ksi.ksi_uid = td->td_ucred->cr_ruid;
1723 return (killpg1(td, uap->signum, uap->pgid, 0, &ksi));
1725 #endif /* COMPAT_43 */
1727 #ifndef _SYS_SYSPROTO_H_
1728 struct sigqueue_args {
1731 /* union sigval */ void *value;
1735 sigqueue(struct thread *td, struct sigqueue_args *uap)
1741 if ((u_int)uap->signum > _SIG_MAXSIG)
1745 * Specification says sigqueue can only send signal to
1751 if ((p = pfind(uap->pid)) == NULL) {
1752 if ((p = zpfind(uap->pid)) == NULL)
1755 error = p_cansignal(td, p, uap->signum);
1756 if (error == 0 && uap->signum != 0) {
1757 ksiginfo_init(&ksi);
1758 ksi.ksi_flags = KSI_SIGQ;
1759 ksi.ksi_signo = uap->signum;
1760 ksi.ksi_code = SI_QUEUE;
1761 ksi.ksi_pid = td->td_proc->p_pid;
1762 ksi.ksi_uid = td->td_ucred->cr_ruid;
1763 ksi.ksi_value.sival_ptr = uap->value;
1764 error = pksignal(p, ksi.ksi_signo, &ksi);
1771 * Send a signal to a process group.
1774 gsignal(int pgid, int sig, ksiginfo_t *ksi)
1779 sx_slock(&proctree_lock);
1780 pgrp = pgfind(pgid);
1781 sx_sunlock(&proctree_lock);
1783 pgsignal(pgrp, sig, 0, ksi);
1790 * Send a signal to a process group. If checktty is 1,
1791 * limit to members which have a controlling terminal.
1794 pgsignal(struct pgrp *pgrp, int sig, int checkctty, ksiginfo_t *ksi)
1799 PGRP_LOCK_ASSERT(pgrp, MA_OWNED);
1800 LIST_FOREACH(p, &pgrp->pg_members, p_pglist) {
1802 if (p->p_state == PRS_NORMAL &&
1803 (checkctty == 0 || p->p_flag & P_CONTROLT))
1804 pksignal(p, sig, ksi);
1811 * Send a signal caused by a trap to the current thread. If it will be
1812 * caught immediately, deliver it with correct code. Otherwise, post it
1816 trapsignal(struct thread *td, ksiginfo_t *ksi)
1825 sig = ksi->ksi_signo;
1826 code = ksi->ksi_code;
1827 KASSERT(_SIG_VALID(sig), ("invalid signal"));
1831 mtx_lock(&ps->ps_mtx);
1832 if ((p->p_flag & P_TRACED) == 0 && SIGISMEMBER(ps->ps_sigcatch, sig) &&
1833 !SIGISMEMBER(td->td_sigmask, sig)) {
1834 td->td_ru.ru_nsignals++;
1836 if (KTRPOINT(curthread, KTR_PSIG))
1837 ktrpsig(sig, ps->ps_sigact[_SIG_IDX(sig)],
1838 &td->td_sigmask, code);
1840 (*p->p_sysent->sv_sendsig)(ps->ps_sigact[_SIG_IDX(sig)],
1841 ksi, &td->td_sigmask);
1842 mask = ps->ps_catchmask[_SIG_IDX(sig)];
1843 if (!SIGISMEMBER(ps->ps_signodefer, sig))
1844 SIGADDSET(mask, sig);
1845 kern_sigprocmask(td, SIG_BLOCK, &mask, NULL,
1846 SIGPROCMASK_PROC_LOCKED | SIGPROCMASK_PS_LOCKED);
1847 if (SIGISMEMBER(ps->ps_sigreset, sig)) {
1849 * See kern_sigaction() for origin of this code.
1851 SIGDELSET(ps->ps_sigcatch, sig);
1852 if (sig != SIGCONT &&
1853 sigprop(sig) & SA_IGNORE)
1854 SIGADDSET(ps->ps_sigignore, sig);
1855 ps->ps_sigact[_SIG_IDX(sig)] = SIG_DFL;
1857 mtx_unlock(&ps->ps_mtx);
1860 * Avoid a possible infinite loop if the thread
1861 * masking the signal or process is ignoring the
1864 if (kern_forcesigexit &&
1865 (SIGISMEMBER(td->td_sigmask, sig) ||
1866 ps->ps_sigact[_SIG_IDX(sig)] == SIG_IGN)) {
1867 SIGDELSET(td->td_sigmask, sig);
1868 SIGDELSET(ps->ps_sigcatch, sig);
1869 SIGDELSET(ps->ps_sigignore, sig);
1870 ps->ps_sigact[_SIG_IDX(sig)] = SIG_DFL;
1872 mtx_unlock(&ps->ps_mtx);
1873 p->p_code = code; /* XXX for core dump/debugger */
1874 p->p_sig = sig; /* XXX to verify code */
1875 tdsendsignal(p, td, sig, ksi);
1880 static struct thread *
1881 sigtd(struct proc *p, int sig, int prop)
1883 struct thread *td, *signal_td;
1885 PROC_LOCK_ASSERT(p, MA_OWNED);
1888 * Check if current thread can handle the signal without
1889 * switching context to another thread.
1891 if (curproc == p && !SIGISMEMBER(curthread->td_sigmask, sig))
1894 FOREACH_THREAD_IN_PROC(p, td) {
1895 if (!SIGISMEMBER(td->td_sigmask, sig)) {
1900 if (signal_td == NULL)
1901 signal_td = FIRST_THREAD_IN_PROC(p);
1906 * Send the signal to the process. If the signal has an action, the action
1907 * is usually performed by the target process rather than the caller; we add
1908 * the signal to the set of pending signals for the process.
1911 * o When a stop signal is sent to a sleeping process that takes the
1912 * default action, the process is stopped without awakening it.
1913 * o SIGCONT restarts stopped processes (or puts them back to sleep)
1914 * regardless of the signal action (eg, blocked or ignored).
1916 * Other ignored signals are discarded immediately.
1918 * NB: This function may be entered from the debugger via the "kill" DDB
1919 * command. There is little that can be done to mitigate the possibly messy
1920 * side effects of this unwise possibility.
1923 psignal(struct proc *p, int sig)
1927 ksiginfo_init(&ksi);
1928 ksi.ksi_signo = sig;
1929 ksi.ksi_code = SI_KERNEL;
1930 (void) tdsendsignal(p, NULL, sig, &ksi);
1934 pksignal(struct proc *p, int sig, ksiginfo_t *ksi)
1937 return (tdsendsignal(p, NULL, sig, ksi));
1940 /* Utility function for finding a thread to send signal event to. */
1942 sigev_findtd(struct proc *p ,struct sigevent *sigev, struct thread **ttd)
1946 if (sigev->sigev_notify == SIGEV_THREAD_ID) {
1947 td = tdfind(sigev->sigev_notify_thread_id, p->p_pid);
1959 tdsignal(struct thread *td, int sig)
1963 ksiginfo_init(&ksi);
1964 ksi.ksi_signo = sig;
1965 ksi.ksi_code = SI_KERNEL;
1966 (void) tdsendsignal(td->td_proc, td, sig, &ksi);
1970 tdksignal(struct thread *td, int sig, ksiginfo_t *ksi)
1973 (void) tdsendsignal(td->td_proc, td, sig, ksi);
1977 tdsendsignal(struct proc *p, struct thread *td, int sig, ksiginfo_t *ksi)
1980 sigqueue_t *sigqueue;
1987 MPASS(td == NULL || p == td->td_proc);
1988 PROC_LOCK_ASSERT(p, MA_OWNED);
1990 if (!_SIG_VALID(sig))
1991 panic("%s(): invalid signal %d", __func__, sig);
1993 KASSERT(ksi == NULL || !KSI_ONQ(ksi), ("%s: ksi on queue", __func__));
1996 * IEEE Std 1003.1-2001: return success when killing a zombie.
1998 if (p->p_state == PRS_ZOMBIE) {
1999 if (ksi && (ksi->ksi_flags & KSI_INS))
2000 ksiginfo_tryfree(ksi);
2005 KNOTE_LOCKED(&p->p_klist, NOTE_SIGNAL | sig);
2006 prop = sigprop(sig);
2009 td = sigtd(p, sig, prop);
2010 sigqueue = &p->p_sigqueue;
2012 KASSERT(td->td_proc == p, ("invalid thread"));
2013 sigqueue = &td->td_sigqueue;
2016 SDT_PROBE(proc, kernel, , signal_send, td, p, sig, 0, 0 );
2019 * If the signal is being ignored,
2020 * then we forget about it immediately.
2021 * (Note: we don't set SIGCONT in ps_sigignore,
2022 * and if it is set to SIG_IGN,
2023 * action will be SIG_DFL here.)
2025 mtx_lock(&ps->ps_mtx);
2026 if (SIGISMEMBER(ps->ps_sigignore, sig)) {
2027 SDT_PROBE(proc, kernel, , signal_discard, ps, td, sig, 0, 0 );
2029 mtx_unlock(&ps->ps_mtx);
2030 if (ksi && (ksi->ksi_flags & KSI_INS))
2031 ksiginfo_tryfree(ksi);
2034 if (SIGISMEMBER(td->td_sigmask, sig))
2036 else if (SIGISMEMBER(ps->ps_sigcatch, sig))
2040 if (SIGISMEMBER(ps->ps_sigintr, sig))
2044 mtx_unlock(&ps->ps_mtx);
2047 sigqueue_delete_stopmask_proc(p);
2048 else if (prop & SA_STOP) {
2050 * If sending a tty stop signal to a member of an orphaned
2051 * process group, discard the signal here if the action
2052 * is default; don't stop the process below if sleeping,
2053 * and don't clear any pending SIGCONT.
2055 if ((prop & SA_TTYSTOP) &&
2056 (p->p_pgrp->pg_jobc == 0) &&
2057 (action == SIG_DFL)) {
2058 if (ksi && (ksi->ksi_flags & KSI_INS))
2059 ksiginfo_tryfree(ksi);
2062 sigqueue_delete_proc(p, SIGCONT);
2063 if (p->p_flag & P_CONTINUED) {
2064 p->p_flag &= ~P_CONTINUED;
2065 PROC_LOCK(p->p_pptr);
2066 sigqueue_take(p->p_ksi);
2067 PROC_UNLOCK(p->p_pptr);
2071 ret = sigqueue_add(sigqueue, sig, ksi);
2076 * Defer further processing for signals which are held,
2077 * except that stopped processes must be continued by SIGCONT.
2079 if (action == SIG_HOLD &&
2080 !((prop & SA_CONT) && (p->p_flag & P_STOPPED_SIG)))
2083 * SIGKILL: Remove procfs STOPEVENTs.
2085 if (sig == SIGKILL) {
2086 /* from procfs_ioctl.c: PIOCBIC */
2088 /* from procfs_ioctl.c: PIOCCONT */
2093 * Some signals have a process-wide effect and a per-thread
2094 * component. Most processing occurs when the process next
2095 * tries to cross the user boundary, however there are some
2096 * times when processing needs to be done immediatly, such as
2097 * waking up threads so that they can cross the user boundary.
2098 * We try do the per-process part here.
2100 if (P_SHOULDSTOP(p)) {
2101 if (sig == SIGKILL) {
2103 * If traced process is already stopped,
2104 * then no further action is necessary.
2106 if (p->p_flag & P_TRACED)
2109 * SIGKILL sets process running.
2110 * It will die elsewhere.
2111 * All threads must be restarted.
2113 p->p_flag &= ~P_STOPPED_SIG;
2117 if (prop & SA_CONT) {
2119 * If traced process is already stopped,
2120 * then no further action is necessary.
2122 if (p->p_flag & P_TRACED)
2125 * If SIGCONT is default (or ignored), we continue the
2126 * process but don't leave the signal in sigqueue as
2127 * it has no further action. If SIGCONT is held, we
2128 * continue the process and leave the signal in
2129 * sigqueue. If the process catches SIGCONT, let it
2130 * handle the signal itself. If it isn't waiting on
2131 * an event, it goes back to run state.
2132 * Otherwise, process goes back to sleep state.
2134 p->p_flag &= ~P_STOPPED_SIG;
2136 if (p->p_numthreads == p->p_suspcount) {
2138 p->p_flag |= P_CONTINUED;
2139 p->p_xstat = SIGCONT;
2140 PROC_LOCK(p->p_pptr);
2141 childproc_continued(p);
2142 PROC_UNLOCK(p->p_pptr);
2145 if (action == SIG_DFL) {
2146 thread_unsuspend(p);
2148 sigqueue_delete(sigqueue, sig);
2151 if (action == SIG_CATCH) {
2153 * The process wants to catch it so it needs
2154 * to run at least one thread, but which one?
2160 * The signal is not ignored or caught.
2162 thread_unsuspend(p);
2167 if (prop & SA_STOP) {
2169 * If traced process is already stopped,
2170 * then no further action is necessary.
2172 if (p->p_flag & P_TRACED)
2175 * Already stopped, don't need to stop again
2176 * (If we did the shell could get confused).
2177 * Just make sure the signal STOP bit set.
2179 p->p_flag |= P_STOPPED_SIG;
2180 sigqueue_delete(sigqueue, sig);
2185 * All other kinds of signals:
2186 * If a thread is sleeping interruptibly, simulate a
2187 * wakeup so that when it is continued it will be made
2188 * runnable and can look at the signal. However, don't make
2189 * the PROCESS runnable, leave it stopped.
2190 * It may run a bit until it hits a thread_suspend_check().
2195 if (TD_ON_SLEEPQ(td) && (td->td_flags & TDF_SINTR))
2196 wakeup_swapper = sleepq_abort(td, intrval);
2203 * Mutexes are short lived. Threads waiting on them will
2204 * hit thread_suspend_check() soon.
2206 } else if (p->p_state == PRS_NORMAL) {
2207 if (p->p_flag & P_TRACED || action == SIG_CATCH) {
2208 tdsigwakeup(td, sig, action, intrval);
2212 MPASS(action == SIG_DFL);
2214 if (prop & SA_STOP) {
2215 if (p->p_flag & P_PPWAIT)
2217 p->p_flag |= P_STOPPED_SIG;
2220 sig_suspend_threads(td, p, 1);
2221 if (p->p_numthreads == p->p_suspcount) {
2223 * only thread sending signal to another
2224 * process can reach here, if thread is sending
2225 * signal to its process, because thread does
2226 * not suspend itself here, p_numthreads
2227 * should never be equal to p_suspcount.
2231 sigqueue_delete_proc(p, p->p_xstat);
2237 /* Not in "NORMAL" state. discard the signal. */
2238 sigqueue_delete(sigqueue, sig);
2243 * The process is not stopped so we need to apply the signal to all the
2247 tdsigwakeup(td, sig, action, intrval);
2249 thread_unsuspend(p);
2252 /* If we jump here, proc slock should not be owned. */
2253 PROC_SLOCK_ASSERT(p, MA_NOTOWNED);
2258 * The force of a signal has been directed against a single
2259 * thread. We need to see what we can do about knocking it
2260 * out of any sleep it may be in etc.
2263 tdsigwakeup(struct thread *td, int sig, sig_t action, int intrval)
2265 struct proc *p = td->td_proc;
2270 PROC_LOCK_ASSERT(p, MA_OWNED);
2271 prop = sigprop(sig);
2276 * Bring the priority of a thread up if we want it to get
2277 * killed in this lifetime.
2279 if (action == SIG_DFL && (prop & SA_KILL) && td->td_priority > PUSER)
2280 sched_prio(td, PUSER);
2281 if (TD_ON_SLEEPQ(td)) {
2283 * If thread is sleeping uninterruptibly
2284 * we can't interrupt the sleep... the signal will
2285 * be noticed when the process returns through
2286 * trap() or syscall().
2288 if ((td->td_flags & TDF_SINTR) == 0)
2291 * If SIGCONT is default (or ignored) and process is
2292 * asleep, we are finished; the process should not
2295 if ((prop & SA_CONT) && action == SIG_DFL) {
2298 sigqueue_delete(&p->p_sigqueue, sig);
2300 * It may be on either list in this state.
2301 * Remove from both for now.
2303 sigqueue_delete(&td->td_sigqueue, sig);
2308 * Give low priority threads a better chance to run.
2310 if (td->td_priority > PUSER)
2311 sched_prio(td, PUSER);
2313 wakeup_swapper = sleepq_abort(td, intrval);
2316 * Other states do nothing with the signal immediately,
2317 * other than kicking ourselves if we are running.
2318 * It will either never be noticed, or noticed very soon.
2321 if (TD_IS_RUNNING(td) && td != curthread)
2333 sig_suspend_threads(struct thread *td, struct proc *p, int sending)
2338 PROC_LOCK_ASSERT(p, MA_OWNED);
2339 PROC_SLOCK_ASSERT(p, MA_OWNED);
2342 FOREACH_THREAD_IN_PROC(p, td2) {
2344 td2->td_flags |= TDF_ASTPENDING | TDF_NEEDSUSPCHK;
2345 if ((TD_IS_SLEEPING(td2) || TD_IS_SWAPPED(td2)) &&
2346 (td2->td_flags & TDF_SINTR)) {
2347 if (td2->td_flags & TDF_SBDRY) {
2348 if (TD_IS_SUSPENDED(td2))
2350 thread_unsuspend_one(td2);
2351 if (TD_ON_SLEEPQ(td2))
2353 sleepq_abort(td2, ERESTART);
2354 } else if (!TD_IS_SUSPENDED(td2)) {
2355 thread_suspend_one(td2);
2357 } else if (!TD_IS_SUSPENDED(td2)) {
2358 if (sending || td != td2)
2359 td2->td_flags |= TDF_ASTPENDING;
2361 if (TD_IS_RUNNING(td2) && td2 != td)
2362 forward_signal(td2);
2372 ptracestop(struct thread *td, int sig)
2374 struct proc *p = td->td_proc;
2376 PROC_LOCK_ASSERT(p, MA_OWNED);
2377 WITNESS_WARN(WARN_GIANTOK | WARN_SLEEPOK,
2378 &p->p_mtx.lock_object, "Stopping for traced signal");
2380 td->td_dbgflags |= TDB_XSIG;
2383 while ((p->p_flag & P_TRACED) && (td->td_dbgflags & TDB_XSIG)) {
2384 if (p->p_flag & P_SINGLE_EXIT) {
2385 td->td_dbgflags &= ~TDB_XSIG;
2390 * Just make wait() to work, the last stopped thread
2395 p->p_flag |= (P_STOPPED_SIG|P_STOPPED_TRACE);
2396 sig_suspend_threads(td, p, 0);
2397 if ((td->td_dbgflags & TDB_STOPATFORK) != 0) {
2398 td->td_dbgflags &= ~TDB_STOPATFORK;
2399 cv_broadcast(&p->p_dbgwait);
2402 thread_suspend_switch(td);
2403 if (!(p->p_flag & P_TRACED)) {
2406 if (td->td_dbgflags & TDB_SUSPEND) {
2407 if (p->p_flag & P_SINGLE_EXIT)
2413 return (td->td_xsig);
2417 reschedule_signals(struct proc *p, sigset_t block, int flags)
2423 PROC_LOCK_ASSERT(p, MA_OWNED);
2424 if (SIGISEMPTY(p->p_siglist))
2427 SIGSETAND(block, p->p_siglist);
2428 while ((sig = sig_ffs(&block)) != 0) {
2429 SIGDELSET(block, sig);
2430 td = sigtd(p, sig, 0);
2432 if (!(flags & SIGPROCMASK_PS_LOCKED))
2433 mtx_lock(&ps->ps_mtx);
2434 if (p->p_flag & P_TRACED || SIGISMEMBER(ps->ps_sigcatch, sig))
2435 tdsigwakeup(td, sig, SIG_CATCH,
2436 (SIGISMEMBER(ps->ps_sigintr, sig) ? EINTR :
2438 if (!(flags & SIGPROCMASK_PS_LOCKED))
2439 mtx_unlock(&ps->ps_mtx);
2444 tdsigcleanup(struct thread *td)
2450 PROC_LOCK_ASSERT(p, MA_OWNED);
2452 sigqueue_flush(&td->td_sigqueue);
2453 if (p->p_numthreads == 1)
2457 * Since we cannot handle signals, notify signal post code
2458 * about this by filling the sigmask.
2460 * Also, if needed, wake up thread(s) that do not block the
2461 * same signals as the exiting thread, since the thread might
2462 * have been selected for delivery and woken up.
2464 SIGFILLSET(unblocked);
2465 SIGSETNAND(unblocked, td->td_sigmask);
2466 SIGFILLSET(td->td_sigmask);
2467 reschedule_signals(p, unblocked, 0);
2472 * If the current process has received a signal (should be caught or cause
2473 * termination, should interrupt current syscall), return the signal number.
2474 * Stop signals with default action are processed immediately, then cleared;
2475 * they aren't returned. This is checked after each entry to the system for
2476 * a syscall or trap (though this can usually be done without calling issignal
2477 * by checking the pending signal masks in cursig.) The normal call
2480 * while (sig = cursig(curthread))
2484 issignal(struct thread *td, int stop_allowed)
2488 struct sigqueue *queue;
2489 sigset_t sigpending;
2490 int sig, prop, newsig;
2494 mtx_assert(&ps->ps_mtx, MA_OWNED);
2495 PROC_LOCK_ASSERT(p, MA_OWNED);
2497 int traced = (p->p_flag & P_TRACED) || (p->p_stops & S_SIG);
2499 sigpending = td->td_sigqueue.sq_signals;
2500 SIGSETOR(sigpending, p->p_sigqueue.sq_signals);
2501 SIGSETNAND(sigpending, td->td_sigmask);
2503 if (p->p_flag & P_PPWAIT)
2504 SIG_STOPSIGMASK(sigpending);
2505 if (SIGISEMPTY(sigpending)) /* no signal to send */
2507 sig = sig_ffs(&sigpending);
2509 if (p->p_stops & S_SIG) {
2510 mtx_unlock(&ps->ps_mtx);
2511 stopevent(p, S_SIG, sig);
2512 mtx_lock(&ps->ps_mtx);
2516 * We should see pending but ignored signals
2517 * only if P_TRACED was on when they were posted.
2519 if (SIGISMEMBER(ps->ps_sigignore, sig) && (traced == 0)) {
2520 sigqueue_delete(&td->td_sigqueue, sig);
2521 sigqueue_delete(&p->p_sigqueue, sig);
2524 if (p->p_flag & P_TRACED && (p->p_flag & P_PPWAIT) == 0) {
2526 * If traced, always stop.
2527 * Remove old signal from queue before the stop.
2528 * XXX shrug off debugger, it causes siginfo to
2531 queue = &td->td_sigqueue;
2532 td->td_dbgksi.ksi_signo = 0;
2533 if (sigqueue_get(queue, sig, &td->td_dbgksi) == 0) {
2534 queue = &p->p_sigqueue;
2535 sigqueue_get(queue, sig, &td->td_dbgksi);
2538 mtx_unlock(&ps->ps_mtx);
2539 newsig = ptracestop(td, sig);
2540 mtx_lock(&ps->ps_mtx);
2542 if (sig != newsig) {
2545 * If parent wants us to take the signal,
2546 * then it will leave it in p->p_xstat;
2547 * otherwise we just look for signals again.
2554 * Put the new signal into td_sigqueue. If the
2555 * signal is being masked, look for other signals.
2557 sigqueue_add(queue, sig, NULL);
2558 if (SIGISMEMBER(td->td_sigmask, sig))
2562 if (td->td_dbgksi.ksi_signo != 0) {
2563 td->td_dbgksi.ksi_flags |= KSI_HEAD;
2564 if (sigqueue_add(&td->td_sigqueue, sig,
2565 &td->td_dbgksi) != 0)
2566 td->td_dbgksi.ksi_signo = 0;
2568 if (td->td_dbgksi.ksi_signo == 0)
2569 sigqueue_add(&td->td_sigqueue, sig,
2574 * If the traced bit got turned off, go back up
2575 * to the top to rescan signals. This ensures
2576 * that p_sig* and p_sigact are consistent.
2578 if ((p->p_flag & P_TRACED) == 0)
2582 prop = sigprop(sig);
2585 * Decide whether the signal should be returned.
2586 * Return the signal's number, or fall through
2587 * to clear it from the pending mask.
2589 switch ((intptr_t)p->p_sigacts->ps_sigact[_SIG_IDX(sig)]) {
2591 case (intptr_t)SIG_DFL:
2593 * Don't take default actions on system processes.
2595 if (p->p_pid <= 1) {
2598 * Are you sure you want to ignore SIGSEGV
2601 printf("Process (pid %lu) got signal %d\n",
2602 (u_long)p->p_pid, sig);
2604 break; /* == ignore */
2607 * If there is a pending stop signal to process
2608 * with default action, stop here,
2609 * then clear the signal. However,
2610 * if process is member of an orphaned
2611 * process group, ignore tty stop signals.
2613 if (prop & SA_STOP) {
2614 if (p->p_flag & P_TRACED ||
2615 (p->p_pgrp->pg_jobc == 0 &&
2617 break; /* == ignore */
2619 /* Ignore, but do not drop the stop signal. */
2620 if (stop_allowed != SIG_STOP_ALLOWED)
2622 mtx_unlock(&ps->ps_mtx);
2623 WITNESS_WARN(WARN_GIANTOK | WARN_SLEEPOK,
2624 &p->p_mtx.lock_object, "Catching SIGSTOP");
2625 p->p_flag |= P_STOPPED_SIG;
2628 sig_suspend_threads(td, p, 0);
2629 thread_suspend_switch(td);
2631 mtx_lock(&ps->ps_mtx);
2633 } else if (prop & SA_IGNORE) {
2635 * Except for SIGCONT, shouldn't get here.
2636 * Default action is to ignore; drop it.
2638 break; /* == ignore */
2643 case (intptr_t)SIG_IGN:
2645 * Masking above should prevent us ever trying
2646 * to take action on an ignored signal other
2647 * than SIGCONT, unless process is traced.
2649 if ((prop & SA_CONT) == 0 &&
2650 (p->p_flag & P_TRACED) == 0)
2651 printf("issignal\n");
2652 break; /* == ignore */
2656 * This signal has an action, let
2657 * postsig() process it.
2661 sigqueue_delete(&td->td_sigqueue, sig); /* take the signal! */
2662 sigqueue_delete(&p->p_sigqueue, sig);
2668 thread_stopped(struct proc *p)
2672 PROC_LOCK_ASSERT(p, MA_OWNED);
2673 PROC_SLOCK_ASSERT(p, MA_OWNED);
2677 if ((p->p_flag & P_STOPPED_SIG) && (n == p->p_numthreads)) {
2679 p->p_flag &= ~P_WAITED;
2680 PROC_LOCK(p->p_pptr);
2681 childproc_stopped(p, (p->p_flag & P_TRACED) ?
2682 CLD_TRAPPED : CLD_STOPPED);
2683 PROC_UNLOCK(p->p_pptr);
2689 * Take the action for the specified signal
2690 * from the current set of pending signals.
2696 struct thread *td = curthread;
2697 register struct proc *p = td->td_proc;
2701 sigset_t returnmask, mask;
2703 KASSERT(sig != 0, ("postsig"));
2705 PROC_LOCK_ASSERT(p, MA_OWNED);
2707 mtx_assert(&ps->ps_mtx, MA_OWNED);
2708 ksiginfo_init(&ksi);
2709 if (sigqueue_get(&td->td_sigqueue, sig, &ksi) == 0 &&
2710 sigqueue_get(&p->p_sigqueue, sig, &ksi) == 0)
2712 ksi.ksi_signo = sig;
2713 if (ksi.ksi_code == SI_TIMER)
2714 itimer_accept(p, ksi.ksi_timerid, &ksi);
2715 action = ps->ps_sigact[_SIG_IDX(sig)];
2717 if (KTRPOINT(td, KTR_PSIG))
2718 ktrpsig(sig, action, td->td_pflags & TDP_OLDMASK ?
2719 &td->td_oldsigmask : &td->td_sigmask, ksi.ksi_code);
2721 if (p->p_stops & S_SIG) {
2722 mtx_unlock(&ps->ps_mtx);
2723 stopevent(p, S_SIG, sig);
2724 mtx_lock(&ps->ps_mtx);
2727 if (action == SIG_DFL) {
2729 * Default action, where the default is to kill
2730 * the process. (Other cases were ignored above.)
2732 mtx_unlock(&ps->ps_mtx);
2737 * If we get here, the signal must be caught.
2739 KASSERT(action != SIG_IGN && !SIGISMEMBER(td->td_sigmask, sig),
2740 ("postsig action"));
2742 * Set the new mask value and also defer further
2743 * occurrences of this signal.
2745 * Special case: user has done a sigsuspend. Here the
2746 * current mask is not of interest, but rather the
2747 * mask from before the sigsuspend is what we want
2748 * restored after the signal processing is completed.
2750 if (td->td_pflags & TDP_OLDMASK) {
2751 returnmask = td->td_oldsigmask;
2752 td->td_pflags &= ~TDP_OLDMASK;
2754 returnmask = td->td_sigmask;
2756 mask = ps->ps_catchmask[_SIG_IDX(sig)];
2757 if (!SIGISMEMBER(ps->ps_signodefer, sig))
2758 SIGADDSET(mask, sig);
2759 kern_sigprocmask(td, SIG_BLOCK, &mask, NULL,
2760 SIGPROCMASK_PROC_LOCKED | SIGPROCMASK_PS_LOCKED);
2762 if (SIGISMEMBER(ps->ps_sigreset, sig)) {
2764 * See kern_sigaction() for origin of this code.
2766 SIGDELSET(ps->ps_sigcatch, sig);
2767 if (sig != SIGCONT &&
2768 sigprop(sig) & SA_IGNORE)
2769 SIGADDSET(ps->ps_sigignore, sig);
2770 ps->ps_sigact[_SIG_IDX(sig)] = SIG_DFL;
2772 td->td_ru.ru_nsignals++;
2773 if (p->p_sig == sig) {
2777 (*p->p_sysent->sv_sendsig)(action, &ksi, &returnmask);
2783 * Kill the current process for stated reason.
2791 PROC_LOCK_ASSERT(p, MA_OWNED);
2792 CTR3(KTR_PROC, "killproc: proc %p (pid %d, %s)",
2793 p, p->p_pid, p->p_comm);
2794 log(LOG_ERR, "pid %d (%s), uid %d, was killed: %s\n", p->p_pid, p->p_comm,
2795 p->p_ucred ? p->p_ucred->cr_uid : -1, why);
2796 p->p_flag |= P_WKILLED;
2797 psignal(p, SIGKILL);
2801 * Force the current process to exit with the specified signal, dumping core
2802 * if appropriate. We bypass the normal tests for masked and caught signals,
2803 * allowing unrecoverable failures to terminate the process without changing
2804 * signal state. Mark the accounting record with the signal termination.
2805 * If dumping core, save the signal number for the debugger. Calls exit and
2813 struct proc *p = td->td_proc;
2815 PROC_LOCK_ASSERT(p, MA_OWNED);
2816 p->p_acflag |= AXSIG;
2818 * We must be single-threading to generate a core dump. This
2819 * ensures that the registers in the core file are up-to-date.
2820 * Also, the ELF dump handler assumes that the thread list doesn't
2821 * change out from under it.
2823 * XXX If another thread attempts to single-thread before us
2824 * (e.g. via fork()), we won't get a dump at all.
2826 if ((sigprop(sig) & SA_CORE) && (thread_single(SINGLE_NO_EXIT) == 0)) {
2829 * Log signals which would cause core dumps
2830 * (Log as LOG_INFO to appease those who don't want
2832 * XXX : Todo, as well as euid, write out ruid too
2833 * Note that coredump() drops proc lock.
2835 if (coredump(td) == 0)
2837 if (kern_logsigexit)
2839 "pid %d (%s), uid %d: exited on signal %d%s\n",
2840 p->p_pid, p->p_comm,
2841 td->td_ucred ? td->td_ucred->cr_uid : -1,
2843 sig & WCOREFLAG ? " (core dumped)" : "");
2846 exit1(td, W_EXITCODE(0, sig));
2851 * Send queued SIGCHLD to parent when child process's state
2855 sigparent(struct proc *p, int reason, int status)
2857 PROC_LOCK_ASSERT(p, MA_OWNED);
2858 PROC_LOCK_ASSERT(p->p_pptr, MA_OWNED);
2860 if (p->p_ksi != NULL) {
2861 p->p_ksi->ksi_signo = SIGCHLD;
2862 p->p_ksi->ksi_code = reason;
2863 p->p_ksi->ksi_status = status;
2864 p->p_ksi->ksi_pid = p->p_pid;
2865 p->p_ksi->ksi_uid = p->p_ucred->cr_ruid;
2866 if (KSI_ONQ(p->p_ksi))
2869 pksignal(p->p_pptr, SIGCHLD, p->p_ksi);
2873 childproc_jobstate(struct proc *p, int reason, int status)
2877 PROC_LOCK_ASSERT(p, MA_OWNED);
2878 PROC_LOCK_ASSERT(p->p_pptr, MA_OWNED);
2881 * Wake up parent sleeping in kern_wait(), also send
2882 * SIGCHLD to parent, but SIGCHLD does not guarantee
2883 * that parent will awake, because parent may masked
2886 p->p_pptr->p_flag |= P_STATCHILD;
2889 ps = p->p_pptr->p_sigacts;
2890 mtx_lock(&ps->ps_mtx);
2891 if ((ps->ps_flag & PS_NOCLDSTOP) == 0) {
2892 mtx_unlock(&ps->ps_mtx);
2893 sigparent(p, reason, status);
2895 mtx_unlock(&ps->ps_mtx);
2899 childproc_stopped(struct proc *p, int reason)
2901 childproc_jobstate(p, reason, p->p_xstat);
2905 childproc_continued(struct proc *p)
2907 childproc_jobstate(p, CLD_CONTINUED, SIGCONT);
2911 childproc_exited(struct proc *p)
2914 int status = p->p_xstat; /* convert to int */
2916 reason = CLD_EXITED;
2917 if (WCOREDUMP(status))
2918 reason = CLD_DUMPED;
2919 else if (WIFSIGNALED(status))
2920 reason = CLD_KILLED;
2922 * XXX avoid calling wakeup(p->p_pptr), the work is
2925 sigparent(p, reason, status);
2929 * We only have 1 character for the core count in the format
2930 * string, so the range will be 0-9
2932 #define MAX_NUM_CORES 10
2933 static int num_cores = 5;
2936 sysctl_debug_num_cores_check (SYSCTL_HANDLER_ARGS)
2941 new_val = num_cores;
2942 error = sysctl_handle_int(oidp, &new_val, 0, req);
2943 if (error != 0 || req->newptr == NULL)
2945 if (new_val > MAX_NUM_CORES)
2946 new_val = MAX_NUM_CORES;
2949 num_cores = new_val;
2952 SYSCTL_PROC(_debug, OID_AUTO, ncores, CTLTYPE_INT|CTLFLAG_RW,
2953 0, sizeof(int), sysctl_debug_num_cores_check, "I", "");
2955 #if defined(COMPRESS_USER_CORES)
2956 int compress_user_cores = 1;
2957 SYSCTL_INT(_kern, OID_AUTO, compress_user_cores, CTLFLAG_RW,
2958 &compress_user_cores, 0, "");
2960 int compress_user_cores_gzlevel = -1; /* default level */
2961 SYSCTL_INT(_kern, OID_AUTO, compress_user_cores_gzlevel, CTLFLAG_RW,
2962 &compress_user_cores_gzlevel, -1, "user core gz compression level");
2964 #define GZ_SUFFIX ".gz"
2965 #define GZ_SUFFIX_LEN 3
2968 static char corefilename[MAXPATHLEN] = {"%N.core"};
2969 SYSCTL_STRING(_kern, OID_AUTO, corefile, CTLFLAG_RW, corefilename,
2970 sizeof(corefilename), "process corefile name format string");
2973 * expand_name(name, uid, pid, td, compress)
2974 * Expand the name described in corefilename, using name, uid, and pid.
2975 * corefilename is a printf-like string, with three format specifiers:
2976 * %N name of process ("name")
2977 * %P process id (pid)
2979 * For example, "%N.core" is the default; they can be disabled completely
2980 * by using "/dev/null", or all core files can be stored in "/cores/%U/%N-%P".
2981 * This is controlled by the sysctl variable kern.corefile (see above).
2984 expand_name(const char *name, uid_t uid, pid_t pid, struct thread *td,
2995 format = corefilename;
2996 temp = malloc(MAXPATHLEN, M_TEMP, M_NOWAIT | M_ZERO);
3000 (void)sbuf_new(&sb, temp, MAXPATHLEN, SBUF_FIXEDLEN);
3001 for (i = 0; format[i]; i++) {
3002 switch (format[i]) {
3003 case '%': /* Format character */
3005 switch (format[i]) {
3007 sbuf_putc(&sb, '%');
3009 case 'H': /* hostname */
3010 if (hostname == NULL) {
3011 hostname = malloc(MAXHOSTNAMELEN,
3013 if (hostname == NULL) {
3015 "pid %ld (%s), uid (%lu): "
3016 "unable to alloc memory "
3017 "for corefile hostname\n",
3023 getcredhostname(td->td_ucred, hostname,
3025 sbuf_printf(&sb, "%s", hostname);
3027 case 'I': /* autoincrementing index */
3028 sbuf_printf(&sb, "0");
3029 indexpos = sbuf_len(&sb) - 1;
3031 case 'N': /* process name */
3032 sbuf_printf(&sb, "%s", name);
3034 case 'P': /* process id */
3035 sbuf_printf(&sb, "%u", pid);
3037 case 'U': /* user id */
3038 sbuf_printf(&sb, "%u", uid);
3042 "Unknown format character %c in "
3043 "corename `%s'\n", format[i], format);
3047 sbuf_putc(&sb, format[i]);
3050 free(hostname, M_TEMP);
3051 #ifdef COMPRESS_USER_CORES
3053 sbuf_printf(&sb, GZ_SUFFIX);
3056 if (sbuf_error(&sb) != 0) {
3057 log(LOG_ERR, "pid %ld (%s), uid (%lu): corename is too "
3058 "long\n", (long)pid, name, (u_long)uid);
3068 * If the core format has a %I in it, then we need to check
3069 * for existing corefiles before returning a name.
3070 * To do this we iterate over 0..num_cores to find a
3071 * non-existing core file name to use.
3073 if (indexpos != -1) {
3074 struct nameidata nd;
3076 int flags = O_CREAT | O_EXCL | FWRITE | O_NOFOLLOW;
3077 int cmode = S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP;
3080 for (n = 0; n < num_cores; n++) {
3081 temp[indexpos] = '0' + n;
3082 NDINIT(&nd, LOOKUP, NOFOLLOW | MPSAFE, UIO_SYSSPACE,
3084 error = vn_open(&nd, &flags, cmode, NULL);
3086 if (error == EEXIST) {
3090 "pid %d (%s), uid (%u): Path `%s' failed "
3091 "on initial open test, error = %d\n",
3092 pid, name, uid, temp, error);
3096 vfslocked = NDHASGIANT(&nd);
3097 NDFREE(&nd, NDF_ONLY_PNBUF);
3098 VOP_UNLOCK(nd.ni_vp, 0);
3099 error = vn_close(nd.ni_vp, FWRITE, td->td_ucred, td);
3100 VFS_UNLOCK_GIANT(vfslocked);
3103 "pid %d (%s), uid (%u): Path `%s' failed "
3104 "on close after initial open test, "
3106 pid, name, uid, temp, error);
3117 * Dump a process' core. The main routine does some
3118 * policy checking, and creates the name of the coredump;
3119 * then it passes on a vnode and a size limit to the process-specific
3120 * coredump routine if there is one; if there _is not_ one, it returns
3121 * ENOSYS; otherwise it returns the error from the process-specific routine.
3125 coredump(struct thread *td)
3127 struct proc *p = td->td_proc;
3128 register struct vnode *vp;
3129 register struct ucred *cred = td->td_ucred;
3131 struct nameidata nd;
3133 int error, error1, flags, locked;
3135 char *name; /* name of corefile */
3140 #ifdef COMPRESS_USER_CORES
3141 compress = compress_user_cores;
3145 PROC_LOCK_ASSERT(p, MA_OWNED);
3146 MPASS((p->p_flag & P_HADTHREADS) == 0 || p->p_singlethread == td);
3147 _STOPEVENT(p, S_CORE, 0);
3149 name = expand_name(p->p_comm, td->td_ucred->cr_uid, p->p_pid, td,
3154 audit_proc_coredump(td, NULL, EINVAL);
3158 if (((sugid_coredump == 0) && p->p_flag & P_SUGID) || do_coredump == 0) {
3161 audit_proc_coredump(td, name, EFAULT);
3168 * Note that the bulk of limit checking is done after
3169 * the corefile is created. The exception is if the limit
3170 * for corefiles is 0, in which case we don't bother
3171 * creating the corefile at all. This layout means that
3172 * a corefile is truncated instead of not being created,
3173 * if it is larger than the limit.
3175 limit = (off_t)lim_cur(p, RLIMIT_CORE);
3179 audit_proc_coredump(td, name, EFBIG);
3186 NDINIT(&nd, LOOKUP, NOFOLLOW | MPSAFE, UIO_SYSSPACE, name, td);
3187 flags = O_CREAT | FWRITE | O_NOFOLLOW;
3188 error = vn_open_cred(&nd, &flags, S_IRUSR | S_IWUSR, VN_OPEN_NOAUDIT,
3192 audit_proc_coredump(td, name, error);
3197 vfslocked = NDHASGIANT(&nd);
3198 NDFREE(&nd, NDF_ONLY_PNBUF);
3201 /* Don't dump to non-regular files or files with links. */
3202 if (vp->v_type != VREG ||
3203 VOP_GETATTR(vp, &vattr, cred) || vattr.va_nlink != 1) {
3210 lf.l_whence = SEEK_SET;
3213 lf.l_type = F_WRLCK;
3214 locked = (VOP_ADVLOCK(vp, (caddr_t)p, F_SETLK, &lf, F_FLOCK) == 0);
3216 if (vn_start_write(vp, &mp, V_NOWAIT) != 0) {
3217 lf.l_type = F_UNLCK;
3219 VOP_ADVLOCK(vp, (caddr_t)p, F_UNLCK, &lf, F_FLOCK);
3220 if ((error = vn_close(vp, FWRITE, cred, td)) != 0)
3222 if ((error = vn_start_write(NULL, &mp, V_XSLEEP | PCATCH)) != 0)
3224 VFS_UNLOCK_GIANT(vfslocked);
3230 if (set_core_nodump_flag)
3231 vattr.va_flags = UF_NODUMP;
3232 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
3233 VOP_SETATTR(vp, &vattr, cred);
3235 vn_finished_write(mp);
3237 p->p_acflag |= ACORE;
3240 error = p->p_sysent->sv_coredump ?
3241 p->p_sysent->sv_coredump(td, vp, limit, compress ? IMGACT_CORE_COMPRESS : 0) :
3245 lf.l_type = F_UNLCK;
3246 VOP_ADVLOCK(vp, (caddr_t)p, F_UNLCK, &lf, F_FLOCK);
3249 error1 = vn_close(vp, FWRITE, cred, td);
3254 audit_proc_coredump(td, name, error);
3257 VFS_UNLOCK_GIANT(vfslocked);
3262 * Nonexistent system call-- signal process (may want to handle it). Flag
3263 * error in case process won't see signal immediately (blocked or ignored).
3265 #ifndef _SYS_SYSPROTO_H_
3274 struct nosys_args *args;
3276 struct proc *p = td->td_proc;
3285 * Send a SIGIO or SIGURG signal to a process or process group using stored
3286 * credentials rather than those of the current process.
3289 pgsigio(sigiop, sig, checkctty)
3290 struct sigio **sigiop;
3294 struct sigio *sigio;
3296 ksiginfo_init(&ksi);
3297 ksi.ksi_signo = sig;
3298 ksi.ksi_code = SI_KERNEL;
3302 if (sigio == NULL) {
3306 if (sigio->sio_pgid > 0) {
3307 PROC_LOCK(sigio->sio_proc);
3308 if (CANSIGIO(sigio->sio_ucred, sigio->sio_proc->p_ucred))
3309 psignal(sigio->sio_proc, sig);
3310 PROC_UNLOCK(sigio->sio_proc);
3311 } else if (sigio->sio_pgid < 0) {
3314 PGRP_LOCK(sigio->sio_pgrp);
3315 LIST_FOREACH(p, &sigio->sio_pgrp->pg_members, p_pglist) {
3317 if (p->p_state == PRS_NORMAL &&
3318 CANSIGIO(sigio->sio_ucred, p->p_ucred) &&
3319 (checkctty == 0 || (p->p_flag & P_CONTROLT)))
3323 PGRP_UNLOCK(sigio->sio_pgrp);
3329 filt_sigattach(struct knote *kn)
3331 struct proc *p = curproc;
3333 kn->kn_ptr.p_proc = p;
3334 kn->kn_flags |= EV_CLEAR; /* automatically set */
3336 knlist_add(&p->p_klist, kn, 0);
3342 filt_sigdetach(struct knote *kn)
3344 struct proc *p = kn->kn_ptr.p_proc;
3346 knlist_remove(&p->p_klist, kn, 0);
3350 * signal knotes are shared with proc knotes, so we apply a mask to
3351 * the hint in order to differentiate them from process hints. This
3352 * could be avoided by using a signal-specific knote list, but probably
3353 * isn't worth the trouble.
3356 filt_signal(struct knote *kn, long hint)
3359 if (hint & NOTE_SIGNAL) {
3360 hint &= ~NOTE_SIGNAL;
3362 if (kn->kn_id == hint)
3365 return (kn->kn_data != 0);
3373 ps = malloc(sizeof(struct sigacts), M_SUBPROC, M_WAITOK | M_ZERO);
3375 mtx_init(&ps->ps_mtx, "sigacts", NULL, MTX_DEF);
3380 sigacts_free(struct sigacts *ps)
3383 mtx_lock(&ps->ps_mtx);
3385 if (ps->ps_refcnt == 0) {
3386 mtx_destroy(&ps->ps_mtx);
3387 free(ps, M_SUBPROC);
3389 mtx_unlock(&ps->ps_mtx);
3393 sigacts_hold(struct sigacts *ps)
3395 mtx_lock(&ps->ps_mtx);
3397 mtx_unlock(&ps->ps_mtx);
3402 sigacts_copy(struct sigacts *dest, struct sigacts *src)
3405 KASSERT(dest->ps_refcnt == 1, ("sigacts_copy to shared dest"));
3406 mtx_lock(&src->ps_mtx);
3407 bcopy(src, dest, offsetof(struct sigacts, ps_refcnt));
3408 mtx_unlock(&src->ps_mtx);
3412 sigacts_shared(struct sigacts *ps)
3416 mtx_lock(&ps->ps_mtx);
3417 shared = ps->ps_refcnt > 1;
3418 mtx_unlock(&ps->ps_mtx);