2 * SPDX-License-Identifier: BSD-3-Clause
4 * Copyright (c) 1982, 1986, 1989, 1991, 1993
5 * The Regents of the University of California. All rights reserved.
6 * (c) UNIX System Laboratories, Inc.
7 * All or some portions of this file are derived from material licensed
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10 * the permission of UNIX System Laboratories, Inc.
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36 * @(#)kern_sig.c 8.7 (Berkeley) 4/18/94
39 #include <sys/cdefs.h>
40 __FBSDID("$FreeBSD$");
42 #include "opt_ktrace.h"
44 #include <sys/param.h>
45 #include <sys/ctype.h>
46 #include <sys/systm.h>
47 #include <sys/signalvar.h>
48 #include <sys/vnode.h>
50 #include <sys/capsicum.h>
51 #include <sys/compressor.h>
52 #include <sys/condvar.h>
53 #include <sys/devctl.h>
54 #include <sys/event.h>
55 #include <sys/fcntl.h>
56 #include <sys/imgact.h>
57 #include <sys/kernel.h>
59 #include <sys/ktrace.h>
60 #include <sys/limits.h>
62 #include <sys/malloc.h>
63 #include <sys/mutex.h>
64 #include <sys/refcount.h>
65 #include <sys/namei.h>
67 #include <sys/procdesc.h>
68 #include <sys/ptrace.h>
69 #include <sys/posix4.h>
70 #include <sys/racct.h>
71 #include <sys/resourcevar.h>
74 #include <sys/sleepqueue.h>
78 #include <sys/syscallsubr.h>
79 #include <sys/sysctl.h>
80 #include <sys/sysent.h>
81 #include <sys/syslog.h>
82 #include <sys/sysproto.h>
83 #include <sys/timers.h>
84 #include <sys/unistd.h>
87 #include <vm/vm_extern.h>
92 #include <machine/cpu.h>
94 #include <security/audit/audit.h>
96 #define ONSIG 32 /* NSIG for osig* syscalls. XXX. */
98 SDT_PROVIDER_DECLARE(proc);
99 SDT_PROBE_DEFINE3(proc, , , signal__send,
100 "struct thread *", "struct proc *", "int");
101 SDT_PROBE_DEFINE2(proc, , , signal__clear,
102 "int", "ksiginfo_t *");
103 SDT_PROBE_DEFINE3(proc, , , signal__discard,
104 "struct thread *", "struct proc *", "int");
106 static int coredump(struct thread *);
107 static int killpg1(struct thread *td, int sig, int pgid, int all,
109 static int issignal(struct thread *td);
110 static void reschedule_signals(struct proc *p, sigset_t block, int flags);
111 static int sigprop(int sig);
112 static void tdsigwakeup(struct thread *, int, sig_t, int);
113 static int sig_suspend_threads(struct thread *, struct proc *, int);
114 static int filt_sigattach(struct knote *kn);
115 static void filt_sigdetach(struct knote *kn);
116 static int filt_signal(struct knote *kn, long hint);
117 static struct thread *sigtd(struct proc *p, int sig, bool fast_sigblock);
118 static void sigqueue_start(void);
120 static uma_zone_t ksiginfo_zone = NULL;
121 struct filterops sig_filtops = {
123 .f_attach = filt_sigattach,
124 .f_detach = filt_sigdetach,
125 .f_event = filt_signal,
128 static int kern_logsigexit = 1;
129 SYSCTL_INT(_kern, KERN_LOGSIGEXIT, logsigexit, CTLFLAG_RW,
131 "Log processes quitting on abnormal signals to syslog(3)");
133 static int kern_forcesigexit = 1;
134 SYSCTL_INT(_kern, OID_AUTO, forcesigexit, CTLFLAG_RW,
135 &kern_forcesigexit, 0, "Force trap signal to be handled");
137 static SYSCTL_NODE(_kern, OID_AUTO, sigqueue, CTLFLAG_RW | CTLFLAG_MPSAFE, 0,
138 "POSIX real time signal");
140 static int max_pending_per_proc = 128;
141 SYSCTL_INT(_kern_sigqueue, OID_AUTO, max_pending_per_proc, CTLFLAG_RW,
142 &max_pending_per_proc, 0, "Max pending signals per proc");
144 static int preallocate_siginfo = 1024;
145 SYSCTL_INT(_kern_sigqueue, OID_AUTO, preallocate, CTLFLAG_RDTUN,
146 &preallocate_siginfo, 0, "Preallocated signal memory size");
148 static int signal_overflow = 0;
149 SYSCTL_INT(_kern_sigqueue, OID_AUTO, overflow, CTLFLAG_RD,
150 &signal_overflow, 0, "Number of signals overflew");
152 static int signal_alloc_fail = 0;
153 SYSCTL_INT(_kern_sigqueue, OID_AUTO, alloc_fail, CTLFLAG_RD,
154 &signal_alloc_fail, 0, "signals failed to be allocated");
156 static int kern_lognosys = 0;
157 SYSCTL_INT(_kern, OID_AUTO, lognosys, CTLFLAG_RWTUN, &kern_lognosys, 0,
158 "Log invalid syscalls");
160 __read_frequently bool sigfastblock_fetch_always = false;
161 SYSCTL_BOOL(_kern, OID_AUTO, sigfastblock_fetch_always, CTLFLAG_RWTUN,
162 &sigfastblock_fetch_always, 0,
163 "Fetch sigfastblock word on each syscall entry for proper "
164 "blocking semantic");
166 static bool kern_sig_discard_ign = true;
167 SYSCTL_BOOL(_kern, OID_AUTO, sig_discard_ign, CTLFLAG_RWTUN,
168 &kern_sig_discard_ign, 0,
169 "Discard ignored signals on delivery, otherwise queue them to "
172 SYSINIT(signal, SI_SUB_P1003_1B, SI_ORDER_FIRST+3, sigqueue_start, NULL);
175 * Policy -- Can ucred cr1 send SIGIO to process cr2?
176 * Should use cr_cansignal() once cr_cansignal() allows SIGIO and SIGURG
177 * in the right situations.
179 #define CANSIGIO(cr1, cr2) \
180 ((cr1)->cr_uid == 0 || \
181 (cr1)->cr_ruid == (cr2)->cr_ruid || \
182 (cr1)->cr_uid == (cr2)->cr_ruid || \
183 (cr1)->cr_ruid == (cr2)->cr_uid || \
184 (cr1)->cr_uid == (cr2)->cr_uid)
186 static int sugid_coredump;
187 SYSCTL_INT(_kern, OID_AUTO, sugid_coredump, CTLFLAG_RWTUN,
188 &sugid_coredump, 0, "Allow setuid and setgid processes to dump core");
190 static int capmode_coredump;
191 SYSCTL_INT(_kern, OID_AUTO, capmode_coredump, CTLFLAG_RWTUN,
192 &capmode_coredump, 0, "Allow processes in capability mode to dump core");
194 static int do_coredump = 1;
195 SYSCTL_INT(_kern, OID_AUTO, coredump, CTLFLAG_RW,
196 &do_coredump, 0, "Enable/Disable coredumps");
198 static int set_core_nodump_flag = 0;
199 SYSCTL_INT(_kern, OID_AUTO, nodump_coredump, CTLFLAG_RW, &set_core_nodump_flag,
200 0, "Enable setting the NODUMP flag on coredump files");
202 static int coredump_devctl = 0;
203 SYSCTL_INT(_kern, OID_AUTO, coredump_devctl, CTLFLAG_RW, &coredump_devctl,
204 0, "Generate a devctl notification when processes coredump");
207 * Signal properties and actions.
208 * The array below categorizes the signals and their default actions
209 * according to the following properties:
211 #define SIGPROP_KILL 0x01 /* terminates process by default */
212 #define SIGPROP_CORE 0x02 /* ditto and coredumps */
213 #define SIGPROP_STOP 0x04 /* suspend process */
214 #define SIGPROP_TTYSTOP 0x08 /* ditto, from tty */
215 #define SIGPROP_IGNORE 0x10 /* ignore by default */
216 #define SIGPROP_CONT 0x20 /* continue if suspended */
218 static int sigproptbl[NSIG] = {
219 [SIGHUP] = SIGPROP_KILL,
220 [SIGINT] = SIGPROP_KILL,
221 [SIGQUIT] = SIGPROP_KILL | SIGPROP_CORE,
222 [SIGILL] = SIGPROP_KILL | SIGPROP_CORE,
223 [SIGTRAP] = SIGPROP_KILL | SIGPROP_CORE,
224 [SIGABRT] = SIGPROP_KILL | SIGPROP_CORE,
225 [SIGEMT] = SIGPROP_KILL | SIGPROP_CORE,
226 [SIGFPE] = SIGPROP_KILL | SIGPROP_CORE,
227 [SIGKILL] = SIGPROP_KILL,
228 [SIGBUS] = SIGPROP_KILL | SIGPROP_CORE,
229 [SIGSEGV] = SIGPROP_KILL | SIGPROP_CORE,
230 [SIGSYS] = SIGPROP_KILL | SIGPROP_CORE,
231 [SIGPIPE] = SIGPROP_KILL,
232 [SIGALRM] = SIGPROP_KILL,
233 [SIGTERM] = SIGPROP_KILL,
234 [SIGURG] = SIGPROP_IGNORE,
235 [SIGSTOP] = SIGPROP_STOP,
236 [SIGTSTP] = SIGPROP_STOP | SIGPROP_TTYSTOP,
237 [SIGCONT] = SIGPROP_IGNORE | SIGPROP_CONT,
238 [SIGCHLD] = SIGPROP_IGNORE,
239 [SIGTTIN] = SIGPROP_STOP | SIGPROP_TTYSTOP,
240 [SIGTTOU] = SIGPROP_STOP | SIGPROP_TTYSTOP,
241 [SIGIO] = SIGPROP_IGNORE,
242 [SIGXCPU] = SIGPROP_KILL,
243 [SIGXFSZ] = SIGPROP_KILL,
244 [SIGVTALRM] = SIGPROP_KILL,
245 [SIGPROF] = SIGPROP_KILL,
246 [SIGWINCH] = SIGPROP_IGNORE,
247 [SIGINFO] = SIGPROP_IGNORE,
248 [SIGUSR1] = SIGPROP_KILL,
249 [SIGUSR2] = SIGPROP_KILL,
252 #define _SIG_FOREACH_ADVANCE(i, set) ({ \
256 int __sig = ffs(__bits); \
257 __bits &= ~(1u << (__sig - 1)); \
258 sig = __i * sizeof((set)->__bits[0]) * NBBY + __sig; \
262 if (++__i == _SIG_WORDS) { \
266 __bits = (set)->__bits[__i]; \
271 #define SIG_FOREACH(i, set) \
272 for (int32_t __i = -1, __bits = 0; \
273 _SIG_FOREACH_ADVANCE(i, set); ) \
275 sigset_t fastblock_mask;
280 ksiginfo_zone = uma_zcreate("ksiginfo", sizeof(ksiginfo_t),
281 NULL, NULL, NULL, NULL, UMA_ALIGN_PTR, 0);
282 uma_prealloc(ksiginfo_zone, preallocate_siginfo);
283 p31b_setcfg(CTL_P1003_1B_REALTIME_SIGNALS, _POSIX_REALTIME_SIGNALS);
284 p31b_setcfg(CTL_P1003_1B_RTSIG_MAX, SIGRTMAX - SIGRTMIN + 1);
285 p31b_setcfg(CTL_P1003_1B_SIGQUEUE_MAX, max_pending_per_proc);
286 SIGFILLSET(fastblock_mask);
287 SIG_CANTMASK(fastblock_mask);
291 ksiginfo_alloc(int wait)
295 flags = M_ZERO | (wait ? M_WAITOK : M_NOWAIT);
296 if (ksiginfo_zone != NULL)
297 return ((ksiginfo_t *)uma_zalloc(ksiginfo_zone, flags));
302 ksiginfo_free(ksiginfo_t *ksi)
304 uma_zfree(ksiginfo_zone, ksi);
308 ksiginfo_tryfree(ksiginfo_t *ksi)
310 if (!(ksi->ksi_flags & KSI_EXT)) {
311 uma_zfree(ksiginfo_zone, ksi);
318 sigqueue_init(sigqueue_t *list, struct proc *p)
320 SIGEMPTYSET(list->sq_signals);
321 SIGEMPTYSET(list->sq_kill);
322 SIGEMPTYSET(list->sq_ptrace);
323 TAILQ_INIT(&list->sq_list);
325 list->sq_flags = SQ_INIT;
329 * Get a signal's ksiginfo.
331 * 0 - signal not found
332 * others - signal number
335 sigqueue_get(sigqueue_t *sq, int signo, ksiginfo_t *si)
337 struct proc *p = sq->sq_proc;
338 struct ksiginfo *ksi, *next;
341 KASSERT(sq->sq_flags & SQ_INIT, ("sigqueue not inited"));
343 if (!SIGISMEMBER(sq->sq_signals, signo))
346 if (SIGISMEMBER(sq->sq_ptrace, signo)) {
348 SIGDELSET(sq->sq_ptrace, signo);
349 si->ksi_flags |= KSI_PTRACE;
351 if (SIGISMEMBER(sq->sq_kill, signo)) {
354 SIGDELSET(sq->sq_kill, signo);
357 TAILQ_FOREACH_SAFE(ksi, &sq->sq_list, ksi_link, next) {
358 if (ksi->ksi_signo == signo) {
360 TAILQ_REMOVE(&sq->sq_list, ksi, ksi_link);
361 ksi->ksi_sigq = NULL;
362 ksiginfo_copy(ksi, si);
363 if (ksiginfo_tryfree(ksi) && p != NULL)
372 SIGDELSET(sq->sq_signals, signo);
373 si->ksi_signo = signo;
378 sigqueue_take(ksiginfo_t *ksi)
384 if (ksi == NULL || (sq = ksi->ksi_sigq) == NULL)
388 TAILQ_REMOVE(&sq->sq_list, ksi, ksi_link);
389 ksi->ksi_sigq = NULL;
390 if (!(ksi->ksi_flags & KSI_EXT) && p != NULL)
393 for (kp = TAILQ_FIRST(&sq->sq_list); kp != NULL;
394 kp = TAILQ_NEXT(kp, ksi_link)) {
395 if (kp->ksi_signo == ksi->ksi_signo)
398 if (kp == NULL && !SIGISMEMBER(sq->sq_kill, ksi->ksi_signo) &&
399 !SIGISMEMBER(sq->sq_ptrace, ksi->ksi_signo))
400 SIGDELSET(sq->sq_signals, ksi->ksi_signo);
404 sigqueue_add(sigqueue_t *sq, int signo, ksiginfo_t *si)
406 struct proc *p = sq->sq_proc;
407 struct ksiginfo *ksi;
410 KASSERT(sq->sq_flags & SQ_INIT, ("sigqueue not inited"));
413 * SIGKILL/SIGSTOP cannot be caught or masked, so take the fast path
416 if (signo == SIGKILL || signo == SIGSTOP || si == NULL) {
417 SIGADDSET(sq->sq_kill, signo);
421 /* directly insert the ksi, don't copy it */
422 if (si->ksi_flags & KSI_INS) {
423 if (si->ksi_flags & KSI_HEAD)
424 TAILQ_INSERT_HEAD(&sq->sq_list, si, ksi_link);
426 TAILQ_INSERT_TAIL(&sq->sq_list, si, ksi_link);
431 if (__predict_false(ksiginfo_zone == NULL)) {
432 SIGADDSET(sq->sq_kill, signo);
436 if (p != NULL && p->p_pendingcnt >= max_pending_per_proc) {
439 } else if ((ksi = ksiginfo_alloc(0)) == NULL) {
445 ksiginfo_copy(si, ksi);
446 ksi->ksi_signo = signo;
447 if (si->ksi_flags & KSI_HEAD)
448 TAILQ_INSERT_HEAD(&sq->sq_list, ksi, ksi_link);
450 TAILQ_INSERT_TAIL(&sq->sq_list, ksi, ksi_link);
455 if ((si->ksi_flags & KSI_PTRACE) != 0) {
456 SIGADDSET(sq->sq_ptrace, signo);
459 } else if ((si->ksi_flags & KSI_TRAP) != 0 ||
460 (si->ksi_flags & KSI_SIGQ) == 0) {
461 SIGADDSET(sq->sq_kill, signo);
469 SIGADDSET(sq->sq_signals, signo);
474 sigqueue_flush(sigqueue_t *sq)
476 struct proc *p = sq->sq_proc;
479 KASSERT(sq->sq_flags & SQ_INIT, ("sigqueue not inited"));
482 PROC_LOCK_ASSERT(p, MA_OWNED);
484 while ((ksi = TAILQ_FIRST(&sq->sq_list)) != NULL) {
485 TAILQ_REMOVE(&sq->sq_list, ksi, ksi_link);
486 ksi->ksi_sigq = NULL;
487 if (ksiginfo_tryfree(ksi) && p != NULL)
491 SIGEMPTYSET(sq->sq_signals);
492 SIGEMPTYSET(sq->sq_kill);
493 SIGEMPTYSET(sq->sq_ptrace);
497 sigqueue_move_set(sigqueue_t *src, sigqueue_t *dst, const sigset_t *set)
500 struct proc *p1, *p2;
501 ksiginfo_t *ksi, *next;
503 KASSERT(src->sq_flags & SQ_INIT, ("src sigqueue not inited"));
504 KASSERT(dst->sq_flags & SQ_INIT, ("dst sigqueue not inited"));
507 /* Move siginfo to target list */
508 TAILQ_FOREACH_SAFE(ksi, &src->sq_list, ksi_link, next) {
509 if (SIGISMEMBER(*set, ksi->ksi_signo)) {
510 TAILQ_REMOVE(&src->sq_list, ksi, ksi_link);
513 TAILQ_INSERT_TAIL(&dst->sq_list, ksi, ksi_link);
520 /* Move pending bits to target list */
522 SIGSETAND(tmp, *set);
523 SIGSETOR(dst->sq_kill, tmp);
524 SIGSETNAND(src->sq_kill, tmp);
526 tmp = src->sq_ptrace;
527 SIGSETAND(tmp, *set);
528 SIGSETOR(dst->sq_ptrace, tmp);
529 SIGSETNAND(src->sq_ptrace, tmp);
531 tmp = src->sq_signals;
532 SIGSETAND(tmp, *set);
533 SIGSETOR(dst->sq_signals, tmp);
534 SIGSETNAND(src->sq_signals, tmp);
539 sigqueue_move(sigqueue_t *src, sigqueue_t *dst, int signo)
544 SIGADDSET(set, signo);
545 sigqueue_move_set(src, dst, &set);
550 sigqueue_delete_set(sigqueue_t *sq, const sigset_t *set)
552 struct proc *p = sq->sq_proc;
553 ksiginfo_t *ksi, *next;
555 KASSERT(sq->sq_flags & SQ_INIT, ("src sigqueue not inited"));
557 /* Remove siginfo queue */
558 TAILQ_FOREACH_SAFE(ksi, &sq->sq_list, ksi_link, next) {
559 if (SIGISMEMBER(*set, ksi->ksi_signo)) {
560 TAILQ_REMOVE(&sq->sq_list, ksi, ksi_link);
561 ksi->ksi_sigq = NULL;
562 if (ksiginfo_tryfree(ksi) && p != NULL)
566 SIGSETNAND(sq->sq_kill, *set);
567 SIGSETNAND(sq->sq_ptrace, *set);
568 SIGSETNAND(sq->sq_signals, *set);
572 sigqueue_delete(sigqueue_t *sq, int signo)
577 SIGADDSET(set, signo);
578 sigqueue_delete_set(sq, &set);
581 /* Remove a set of signals for a process */
583 sigqueue_delete_set_proc(struct proc *p, const sigset_t *set)
588 PROC_LOCK_ASSERT(p, MA_OWNED);
590 sigqueue_init(&worklist, NULL);
591 sigqueue_move_set(&p->p_sigqueue, &worklist, set);
593 FOREACH_THREAD_IN_PROC(p, td0)
594 sigqueue_move_set(&td0->td_sigqueue, &worklist, set);
596 sigqueue_flush(&worklist);
600 sigqueue_delete_proc(struct proc *p, int signo)
605 SIGADDSET(set, signo);
606 sigqueue_delete_set_proc(p, &set);
610 sigqueue_delete_stopmask_proc(struct proc *p)
615 SIGADDSET(set, SIGSTOP);
616 SIGADDSET(set, SIGTSTP);
617 SIGADDSET(set, SIGTTIN);
618 SIGADDSET(set, SIGTTOU);
619 sigqueue_delete_set_proc(p, &set);
623 * Determine signal that should be delivered to thread td, the current
624 * thread, 0 if none. If there is a pending stop signal with default
625 * action, the process stops in issignal().
628 cursig(struct thread *td)
630 PROC_LOCK_ASSERT(td->td_proc, MA_OWNED);
631 mtx_assert(&td->td_proc->p_sigacts->ps_mtx, MA_OWNED);
632 THREAD_LOCK_ASSERT(td, MA_NOTOWNED);
633 return (SIGPENDING(td) ? issignal(td) : 0);
637 * Arrange for ast() to handle unmasked pending signals on return to user
638 * mode. This must be called whenever a signal is added to td_sigqueue or
639 * unmasked in td_sigmask.
642 signotify(struct thread *td)
645 PROC_LOCK_ASSERT(td->td_proc, MA_OWNED);
647 if (SIGPENDING(td)) {
649 td->td_flags |= TDF_NEEDSIGCHK | TDF_ASTPENDING;
655 * Returns 1 (true) if altstack is configured for the thread, and the
656 * passed stack bottom address falls into the altstack range. Handles
657 * the 43 compat special case where the alt stack size is zero.
660 sigonstack(size_t sp)
665 if ((td->td_pflags & TDP_ALTSTACK) == 0)
667 #if defined(COMPAT_43)
668 if (SV_PROC_FLAG(td->td_proc, SV_AOUT) && td->td_sigstk.ss_size == 0)
669 return ((td->td_sigstk.ss_flags & SS_ONSTACK) != 0);
671 return (sp >= (size_t)td->td_sigstk.ss_sp &&
672 sp < td->td_sigstk.ss_size + (size_t)td->td_sigstk.ss_sp);
679 if (sig > 0 && sig < nitems(sigproptbl))
680 return (sigproptbl[sig]);
685 sigact_flag_test(const struct sigaction *act, int flag)
689 * SA_SIGINFO is reset when signal disposition is set to
690 * ignore or default. Other flags are kept according to user
693 return ((act->sa_flags & flag) != 0 && (flag != SA_SIGINFO ||
694 ((__sighandler_t *)act->sa_sigaction != SIG_IGN &&
695 (__sighandler_t *)act->sa_sigaction != SIG_DFL)));
705 kern_sigaction(struct thread *td, int sig, const struct sigaction *act,
706 struct sigaction *oact, int flags)
709 struct proc *p = td->td_proc;
711 if (!_SIG_VALID(sig))
713 if (act != NULL && act->sa_handler != SIG_DFL &&
714 act->sa_handler != SIG_IGN && (act->sa_flags & ~(SA_ONSTACK |
715 SA_RESTART | SA_RESETHAND | SA_NOCLDSTOP | SA_NODEFER |
716 SA_NOCLDWAIT | SA_SIGINFO)) != 0)
721 mtx_lock(&ps->ps_mtx);
723 memset(oact, 0, sizeof(*oact));
724 oact->sa_mask = ps->ps_catchmask[_SIG_IDX(sig)];
725 if (SIGISMEMBER(ps->ps_sigonstack, sig))
726 oact->sa_flags |= SA_ONSTACK;
727 if (!SIGISMEMBER(ps->ps_sigintr, sig))
728 oact->sa_flags |= SA_RESTART;
729 if (SIGISMEMBER(ps->ps_sigreset, sig))
730 oact->sa_flags |= SA_RESETHAND;
731 if (SIGISMEMBER(ps->ps_signodefer, sig))
732 oact->sa_flags |= SA_NODEFER;
733 if (SIGISMEMBER(ps->ps_siginfo, sig)) {
734 oact->sa_flags |= SA_SIGINFO;
736 (__siginfohandler_t *)ps->ps_sigact[_SIG_IDX(sig)];
738 oact->sa_handler = ps->ps_sigact[_SIG_IDX(sig)];
739 if (sig == SIGCHLD && ps->ps_flag & PS_NOCLDSTOP)
740 oact->sa_flags |= SA_NOCLDSTOP;
741 if (sig == SIGCHLD && ps->ps_flag & PS_NOCLDWAIT)
742 oact->sa_flags |= SA_NOCLDWAIT;
745 if ((sig == SIGKILL || sig == SIGSTOP) &&
746 act->sa_handler != SIG_DFL) {
747 mtx_unlock(&ps->ps_mtx);
753 * Change setting atomically.
756 ps->ps_catchmask[_SIG_IDX(sig)] = act->sa_mask;
757 SIG_CANTMASK(ps->ps_catchmask[_SIG_IDX(sig)]);
758 if (sigact_flag_test(act, SA_SIGINFO)) {
759 ps->ps_sigact[_SIG_IDX(sig)] =
760 (__sighandler_t *)act->sa_sigaction;
761 SIGADDSET(ps->ps_siginfo, sig);
763 ps->ps_sigact[_SIG_IDX(sig)] = act->sa_handler;
764 SIGDELSET(ps->ps_siginfo, sig);
766 if (!sigact_flag_test(act, SA_RESTART))
767 SIGADDSET(ps->ps_sigintr, sig);
769 SIGDELSET(ps->ps_sigintr, sig);
770 if (sigact_flag_test(act, SA_ONSTACK))
771 SIGADDSET(ps->ps_sigonstack, sig);
773 SIGDELSET(ps->ps_sigonstack, sig);
774 if (sigact_flag_test(act, SA_RESETHAND))
775 SIGADDSET(ps->ps_sigreset, sig);
777 SIGDELSET(ps->ps_sigreset, sig);
778 if (sigact_flag_test(act, SA_NODEFER))
779 SIGADDSET(ps->ps_signodefer, sig);
781 SIGDELSET(ps->ps_signodefer, sig);
782 if (sig == SIGCHLD) {
783 if (act->sa_flags & SA_NOCLDSTOP)
784 ps->ps_flag |= PS_NOCLDSTOP;
786 ps->ps_flag &= ~PS_NOCLDSTOP;
787 if (act->sa_flags & SA_NOCLDWAIT) {
789 * Paranoia: since SA_NOCLDWAIT is implemented
790 * by reparenting the dying child to PID 1 (and
791 * trust it to reap the zombie), PID 1 itself
792 * is forbidden to set SA_NOCLDWAIT.
795 ps->ps_flag &= ~PS_NOCLDWAIT;
797 ps->ps_flag |= PS_NOCLDWAIT;
799 ps->ps_flag &= ~PS_NOCLDWAIT;
800 if (ps->ps_sigact[_SIG_IDX(SIGCHLD)] == SIG_IGN)
801 ps->ps_flag |= PS_CLDSIGIGN;
803 ps->ps_flag &= ~PS_CLDSIGIGN;
806 * Set bit in ps_sigignore for signals that are set to SIG_IGN,
807 * and for signals set to SIG_DFL where the default is to
808 * ignore. However, don't put SIGCONT in ps_sigignore, as we
809 * have to restart the process.
811 if (ps->ps_sigact[_SIG_IDX(sig)] == SIG_IGN ||
812 (sigprop(sig) & SIGPROP_IGNORE &&
813 ps->ps_sigact[_SIG_IDX(sig)] == SIG_DFL)) {
814 /* never to be seen again */
815 sigqueue_delete_proc(p, sig);
817 /* easier in psignal */
818 SIGADDSET(ps->ps_sigignore, sig);
819 SIGDELSET(ps->ps_sigcatch, sig);
821 SIGDELSET(ps->ps_sigignore, sig);
822 if (ps->ps_sigact[_SIG_IDX(sig)] == SIG_DFL)
823 SIGDELSET(ps->ps_sigcatch, sig);
825 SIGADDSET(ps->ps_sigcatch, sig);
827 #ifdef COMPAT_FREEBSD4
828 if (ps->ps_sigact[_SIG_IDX(sig)] == SIG_IGN ||
829 ps->ps_sigact[_SIG_IDX(sig)] == SIG_DFL ||
830 (flags & KSA_FREEBSD4) == 0)
831 SIGDELSET(ps->ps_freebsd4, sig);
833 SIGADDSET(ps->ps_freebsd4, sig);
836 if (ps->ps_sigact[_SIG_IDX(sig)] == SIG_IGN ||
837 ps->ps_sigact[_SIG_IDX(sig)] == SIG_DFL ||
838 (flags & KSA_OSIGSET) == 0)
839 SIGDELSET(ps->ps_osigset, sig);
841 SIGADDSET(ps->ps_osigset, sig);
844 mtx_unlock(&ps->ps_mtx);
849 #ifndef _SYS_SYSPROTO_H_
850 struct sigaction_args {
852 struct sigaction *act;
853 struct sigaction *oact;
857 sys_sigaction(struct thread *td, struct sigaction_args *uap)
859 struct sigaction act, oact;
860 struct sigaction *actp, *oactp;
863 actp = (uap->act != NULL) ? &act : NULL;
864 oactp = (uap->oact != NULL) ? &oact : NULL;
866 error = copyin(uap->act, actp, sizeof(act));
870 error = kern_sigaction(td, uap->sig, actp, oactp, 0);
872 error = copyout(oactp, uap->oact, sizeof(oact));
876 #ifdef COMPAT_FREEBSD4
877 #ifndef _SYS_SYSPROTO_H_
878 struct freebsd4_sigaction_args {
880 struct sigaction *act;
881 struct sigaction *oact;
885 freebsd4_sigaction(struct thread *td, struct freebsd4_sigaction_args *uap)
887 struct sigaction act, oact;
888 struct sigaction *actp, *oactp;
891 actp = (uap->act != NULL) ? &act : NULL;
892 oactp = (uap->oact != NULL) ? &oact : NULL;
894 error = copyin(uap->act, actp, sizeof(act));
898 error = kern_sigaction(td, uap->sig, actp, oactp, KSA_FREEBSD4);
900 error = copyout(oactp, uap->oact, sizeof(oact));
903 #endif /* COMAPT_FREEBSD4 */
905 #ifdef COMPAT_43 /* XXX - COMPAT_FBSD3 */
906 #ifndef _SYS_SYSPROTO_H_
907 struct osigaction_args {
909 struct osigaction *nsa;
910 struct osigaction *osa;
914 osigaction(struct thread *td, struct osigaction_args *uap)
916 struct osigaction sa;
917 struct sigaction nsa, osa;
918 struct sigaction *nsap, *osap;
921 if (uap->signum <= 0 || uap->signum >= ONSIG)
924 nsap = (uap->nsa != NULL) ? &nsa : NULL;
925 osap = (uap->osa != NULL) ? &osa : NULL;
928 error = copyin(uap->nsa, &sa, sizeof(sa));
931 nsap->sa_handler = sa.sa_handler;
932 nsap->sa_flags = sa.sa_flags;
933 OSIG2SIG(sa.sa_mask, nsap->sa_mask);
935 error = kern_sigaction(td, uap->signum, nsap, osap, KSA_OSIGSET);
936 if (osap && !error) {
937 sa.sa_handler = osap->sa_handler;
938 sa.sa_flags = osap->sa_flags;
939 SIG2OSIG(osap->sa_mask, sa.sa_mask);
940 error = copyout(&sa, uap->osa, sizeof(sa));
945 #if !defined(__i386__)
946 /* Avoid replicating the same stub everywhere */
948 osigreturn(struct thread *td, struct osigreturn_args *uap)
951 return (nosys(td, (struct nosys_args *)uap));
954 #endif /* COMPAT_43 */
957 * Initialize signal state for process 0;
958 * set to ignore signals that are ignored by default.
961 siginit(struct proc *p)
968 mtx_lock(&ps->ps_mtx);
969 for (i = 1; i <= NSIG; i++) {
970 if (sigprop(i) & SIGPROP_IGNORE && i != SIGCONT) {
971 SIGADDSET(ps->ps_sigignore, i);
974 mtx_unlock(&ps->ps_mtx);
979 * Reset specified signal to the default disposition.
982 sigdflt(struct sigacts *ps, int sig)
985 mtx_assert(&ps->ps_mtx, MA_OWNED);
986 SIGDELSET(ps->ps_sigcatch, sig);
987 if ((sigprop(sig) & SIGPROP_IGNORE) != 0 && sig != SIGCONT)
988 SIGADDSET(ps->ps_sigignore, sig);
989 ps->ps_sigact[_SIG_IDX(sig)] = SIG_DFL;
990 SIGDELSET(ps->ps_siginfo, sig);
994 * Reset signals for an exec of the specified process.
997 execsigs(struct proc *p)
1003 * Reset caught signals. Held signals remain held
1004 * through td_sigmask (unless they were caught,
1005 * and are now ignored by default).
1007 PROC_LOCK_ASSERT(p, MA_OWNED);
1009 mtx_lock(&ps->ps_mtx);
1013 * Reset stack state to the user stack.
1014 * Clear set of signals caught on the signal stack.
1017 MPASS(td->td_proc == p);
1018 td->td_sigstk.ss_flags = SS_DISABLE;
1019 td->td_sigstk.ss_size = 0;
1020 td->td_sigstk.ss_sp = 0;
1021 td->td_pflags &= ~TDP_ALTSTACK;
1023 * Reset no zombies if child dies flag as Solaris does.
1025 ps->ps_flag &= ~(PS_NOCLDWAIT | PS_CLDSIGIGN);
1026 if (ps->ps_sigact[_SIG_IDX(SIGCHLD)] == SIG_IGN)
1027 ps->ps_sigact[_SIG_IDX(SIGCHLD)] = SIG_DFL;
1028 mtx_unlock(&ps->ps_mtx);
1032 * kern_sigprocmask()
1034 * Manipulate signal mask.
1037 kern_sigprocmask(struct thread *td, int how, sigset_t *set, sigset_t *oset,
1040 sigset_t new_block, oset1;
1045 if ((flags & SIGPROCMASK_PROC_LOCKED) != 0)
1046 PROC_LOCK_ASSERT(p, MA_OWNED);
1049 mtx_assert(&p->p_sigacts->ps_mtx, (flags & SIGPROCMASK_PS_LOCKED) != 0
1050 ? MA_OWNED : MA_NOTOWNED);
1052 *oset = td->td_sigmask;
1059 oset1 = td->td_sigmask;
1060 SIGSETOR(td->td_sigmask, *set);
1061 new_block = td->td_sigmask;
1062 SIGSETNAND(new_block, oset1);
1065 SIGSETNAND(td->td_sigmask, *set);
1070 oset1 = td->td_sigmask;
1071 if (flags & SIGPROCMASK_OLD)
1072 SIGSETLO(td->td_sigmask, *set);
1074 td->td_sigmask = *set;
1075 new_block = td->td_sigmask;
1076 SIGSETNAND(new_block, oset1);
1085 * The new_block set contains signals that were not previously
1086 * blocked, but are blocked now.
1088 * In case we block any signal that was not previously blocked
1089 * for td, and process has the signal pending, try to schedule
1090 * signal delivery to some thread that does not block the
1091 * signal, possibly waking it up.
1093 if (p->p_numthreads != 1)
1094 reschedule_signals(p, new_block, flags);
1098 if (!(flags & SIGPROCMASK_PROC_LOCKED))
1103 #ifndef _SYS_SYSPROTO_H_
1104 struct sigprocmask_args {
1106 const sigset_t *set;
1111 sys_sigprocmask(struct thread *td, struct sigprocmask_args *uap)
1114 sigset_t *setp, *osetp;
1117 setp = (uap->set != NULL) ? &set : NULL;
1118 osetp = (uap->oset != NULL) ? &oset : NULL;
1120 error = copyin(uap->set, setp, sizeof(set));
1124 error = kern_sigprocmask(td, uap->how, setp, osetp, 0);
1125 if (osetp && !error) {
1126 error = copyout(osetp, uap->oset, sizeof(oset));
1131 #ifdef COMPAT_43 /* XXX - COMPAT_FBSD3 */
1132 #ifndef _SYS_SYSPROTO_H_
1133 struct osigprocmask_args {
1139 osigprocmask(struct thread *td, struct osigprocmask_args *uap)
1144 OSIG2SIG(uap->mask, set);
1145 error = kern_sigprocmask(td, uap->how, &set, &oset, 1);
1146 SIG2OSIG(oset, td->td_retval[0]);
1149 #endif /* COMPAT_43 */
1152 sys_sigwait(struct thread *td, struct sigwait_args *uap)
1158 error = copyin(uap->set, &set, sizeof(set));
1160 td->td_retval[0] = error;
1164 error = kern_sigtimedwait(td, set, &ksi, NULL);
1167 * sigwait() function shall not return EINTR, but
1168 * the syscall does. Non-ancient libc provides the
1169 * wrapper which hides EINTR. Otherwise, EINTR return
1170 * is used by libthr to handle required cancellation
1171 * point in the sigwait().
1173 if (error == EINTR && td->td_proc->p_osrel < P_OSREL_SIGWAIT)
1175 td->td_retval[0] = error;
1179 error = copyout(&ksi.ksi_signo, uap->sig, sizeof(ksi.ksi_signo));
1180 td->td_retval[0] = error;
1185 sys_sigtimedwait(struct thread *td, struct sigtimedwait_args *uap)
1188 struct timespec *timeout;
1194 error = copyin(uap->timeout, &ts, sizeof(ts));
1202 error = copyin(uap->set, &set, sizeof(set));
1206 error = kern_sigtimedwait(td, set, &ksi, timeout);
1211 error = copyout(&ksi.ksi_info, uap->info, sizeof(siginfo_t));
1214 td->td_retval[0] = ksi.ksi_signo;
1219 sys_sigwaitinfo(struct thread *td, struct sigwaitinfo_args *uap)
1225 error = copyin(uap->set, &set, sizeof(set));
1229 error = kern_sigtimedwait(td, set, &ksi, NULL);
1234 error = copyout(&ksi.ksi_info, uap->info, sizeof(siginfo_t));
1237 td->td_retval[0] = ksi.ksi_signo;
1242 proc_td_siginfo_capture(struct thread *td, siginfo_t *si)
1246 FOREACH_THREAD_IN_PROC(td->td_proc, thr) {
1250 thr->td_si.si_signo = 0;
1255 kern_sigtimedwait(struct thread *td, sigset_t waitset, ksiginfo_t *ksi,
1256 struct timespec *timeout)
1259 sigset_t saved_mask, new_block;
1261 int error, sig, timevalid = 0;
1262 sbintime_t sbt, precision, tsbt;
1270 /* Ensure the sigfastblock value is up to date. */
1271 sigfastblock_fetch(td);
1273 if (timeout != NULL) {
1274 if (timeout->tv_nsec >= 0 && timeout->tv_nsec < 1000000000) {
1277 if (ts.tv_sec < INT32_MAX / 2) {
1280 precision >>= tc_precexp;
1281 if (TIMESEL(&sbt, tsbt))
1285 precision = sbt = 0;
1288 precision = sbt = 0;
1290 /* Some signals can not be waited for. */
1291 SIG_CANTMASK(waitset);
1294 saved_mask = td->td_sigmask;
1295 SIGSETNAND(td->td_sigmask, waitset);
1296 if ((p->p_sysent->sv_flags & SV_SIG_DISCIGN) != 0 ||
1297 !kern_sig_discard_ign) {
1299 td->td_flags |= TDF_SIGWAIT;
1303 mtx_lock(&ps->ps_mtx);
1305 mtx_unlock(&ps->ps_mtx);
1306 KASSERT(sig >= 0, ("sig %d", sig));
1307 if (sig != 0 && SIGISMEMBER(waitset, sig)) {
1308 if (sigqueue_get(&td->td_sigqueue, sig, ksi) != 0 ||
1309 sigqueue_get(&p->p_sigqueue, sig, ksi) != 0) {
1319 * POSIX says this must be checked after looking for pending
1322 if (timeout != NULL && !timevalid) {
1332 error = msleep_sbt(&p->p_sigacts, &p->p_mtx, PPAUSE | PCATCH,
1333 "sigwait", sbt, precision, C_ABSOLUTE);
1335 /* The syscalls can not be restarted. */
1336 if (error == ERESTART)
1340 * If PTRACE_SCE or PTRACE_SCX were set after
1341 * userspace entered the syscall, return spurious
1342 * EINTR after wait was done. Only do this as last
1343 * resort after rechecking for possible queued signals
1344 * and expired timeouts.
1346 if (error == 0 && (p->p_ptevents & PTRACE_SYSCALL) != 0)
1350 td->td_flags &= ~TDF_SIGWAIT;
1353 new_block = saved_mask;
1354 SIGSETNAND(new_block, td->td_sigmask);
1355 td->td_sigmask = saved_mask;
1357 * Fewer signals can be delivered to us, reschedule signal
1360 if (p->p_numthreads != 1)
1361 reschedule_signals(p, new_block, 0);
1364 SDT_PROBE2(proc, , , signal__clear, sig, ksi);
1366 if (ksi->ksi_code == SI_TIMER)
1367 itimer_accept(p, ksi->ksi_timerid, ksi);
1370 if (KTRPOINT(td, KTR_PSIG)) {
1373 mtx_lock(&ps->ps_mtx);
1374 action = ps->ps_sigact[_SIG_IDX(sig)];
1375 mtx_unlock(&ps->ps_mtx);
1376 ktrpsig(sig, action, &td->td_sigmask, ksi->ksi_code);
1379 if (sig == SIGKILL) {
1380 proc_td_siginfo_capture(td, &ksi->ksi_info);
1388 #ifndef _SYS_SYSPROTO_H_
1389 struct sigpending_args {
1394 sys_sigpending(struct thread *td, struct sigpending_args *uap)
1396 struct proc *p = td->td_proc;
1400 pending = p->p_sigqueue.sq_signals;
1401 SIGSETOR(pending, td->td_sigqueue.sq_signals);
1403 return (copyout(&pending, uap->set, sizeof(sigset_t)));
1406 #ifdef COMPAT_43 /* XXX - COMPAT_FBSD3 */
1407 #ifndef _SYS_SYSPROTO_H_
1408 struct osigpending_args {
1413 osigpending(struct thread *td, struct osigpending_args *uap)
1415 struct proc *p = td->td_proc;
1419 pending = p->p_sigqueue.sq_signals;
1420 SIGSETOR(pending, td->td_sigqueue.sq_signals);
1422 SIG2OSIG(pending, td->td_retval[0]);
1425 #endif /* COMPAT_43 */
1427 #if defined(COMPAT_43)
1429 * Generalized interface signal handler, 4.3-compatible.
1431 #ifndef _SYS_SYSPROTO_H_
1432 struct osigvec_args {
1440 osigvec(struct thread *td, struct osigvec_args *uap)
1443 struct sigaction nsa, osa;
1444 struct sigaction *nsap, *osap;
1447 if (uap->signum <= 0 || uap->signum >= ONSIG)
1449 nsap = (uap->nsv != NULL) ? &nsa : NULL;
1450 osap = (uap->osv != NULL) ? &osa : NULL;
1452 error = copyin(uap->nsv, &vec, sizeof(vec));
1455 nsap->sa_handler = vec.sv_handler;
1456 OSIG2SIG(vec.sv_mask, nsap->sa_mask);
1457 nsap->sa_flags = vec.sv_flags;
1458 nsap->sa_flags ^= SA_RESTART; /* opposite of SV_INTERRUPT */
1460 error = kern_sigaction(td, uap->signum, nsap, osap, KSA_OSIGSET);
1461 if (osap && !error) {
1462 vec.sv_handler = osap->sa_handler;
1463 SIG2OSIG(osap->sa_mask, vec.sv_mask);
1464 vec.sv_flags = osap->sa_flags;
1465 vec.sv_flags &= ~SA_NOCLDWAIT;
1466 vec.sv_flags ^= SA_RESTART;
1467 error = copyout(&vec, uap->osv, sizeof(vec));
1472 #ifndef _SYS_SYSPROTO_H_
1473 struct osigblock_args {
1478 osigblock(struct thread *td, struct osigblock_args *uap)
1482 OSIG2SIG(uap->mask, set);
1483 kern_sigprocmask(td, SIG_BLOCK, &set, &oset, 0);
1484 SIG2OSIG(oset, td->td_retval[0]);
1488 #ifndef _SYS_SYSPROTO_H_
1489 struct osigsetmask_args {
1494 osigsetmask(struct thread *td, struct osigsetmask_args *uap)
1498 OSIG2SIG(uap->mask, set);
1499 kern_sigprocmask(td, SIG_SETMASK, &set, &oset, 0);
1500 SIG2OSIG(oset, td->td_retval[0]);
1503 #endif /* COMPAT_43 */
1506 * Suspend calling thread until signal, providing mask to be set in the
1509 #ifndef _SYS_SYSPROTO_H_
1510 struct sigsuspend_args {
1511 const sigset_t *sigmask;
1516 sys_sigsuspend(struct thread *td, struct sigsuspend_args *uap)
1521 error = copyin(uap->sigmask, &mask, sizeof(mask));
1524 return (kern_sigsuspend(td, mask));
1528 kern_sigsuspend(struct thread *td, sigset_t mask)
1530 struct proc *p = td->td_proc;
1533 /* Ensure the sigfastblock value is up to date. */
1534 sigfastblock_fetch(td);
1537 * When returning from sigsuspend, we want
1538 * the old mask to be restored after the
1539 * signal handler has finished. Thus, we
1540 * save it here and mark the sigacts structure
1544 kern_sigprocmask(td, SIG_SETMASK, &mask, &td->td_oldsigmask,
1545 SIGPROCMASK_PROC_LOCKED);
1546 td->td_pflags |= TDP_OLDMASK;
1549 * Process signals now. Otherwise, we can get spurious wakeup
1550 * due to signal entered process queue, but delivered to other
1551 * thread. But sigsuspend should return only on signal
1554 (p->p_sysent->sv_set_syscall_retval)(td, EINTR);
1555 for (has_sig = 0; !has_sig;) {
1556 while (msleep(&p->p_sigacts, &p->p_mtx, PPAUSE|PCATCH, "pause",
1559 thread_suspend_check(0);
1560 mtx_lock(&p->p_sigacts->ps_mtx);
1561 while ((sig = cursig(td)) != 0) {
1562 KASSERT(sig >= 0, ("sig %d", sig));
1563 has_sig += postsig(sig);
1565 mtx_unlock(&p->p_sigacts->ps_mtx);
1568 * If PTRACE_SCE or PTRACE_SCX were set after
1569 * userspace entered the syscall, return spurious
1572 if ((p->p_ptevents & PTRACE_SYSCALL) != 0)
1576 td->td_errno = EINTR;
1577 td->td_pflags |= TDP_NERRNO;
1578 return (EJUSTRETURN);
1581 #ifdef COMPAT_43 /* XXX - COMPAT_FBSD3 */
1583 * Compatibility sigsuspend call for old binaries. Note nonstandard calling
1584 * convention: libc stub passes mask, not pointer, to save a copyin.
1586 #ifndef _SYS_SYSPROTO_H_
1587 struct osigsuspend_args {
1593 osigsuspend(struct thread *td, struct osigsuspend_args *uap)
1597 OSIG2SIG(uap->mask, mask);
1598 return (kern_sigsuspend(td, mask));
1600 #endif /* COMPAT_43 */
1602 #if defined(COMPAT_43)
1603 #ifndef _SYS_SYSPROTO_H_
1604 struct osigstack_args {
1605 struct sigstack *nss;
1606 struct sigstack *oss;
1611 osigstack(struct thread *td, struct osigstack_args *uap)
1613 struct sigstack nss, oss;
1616 if (uap->nss != NULL) {
1617 error = copyin(uap->nss, &nss, sizeof(nss));
1621 oss.ss_sp = td->td_sigstk.ss_sp;
1622 oss.ss_onstack = sigonstack(cpu_getstack(td));
1623 if (uap->nss != NULL) {
1624 td->td_sigstk.ss_sp = nss.ss_sp;
1625 td->td_sigstk.ss_size = 0;
1626 td->td_sigstk.ss_flags |= nss.ss_onstack & SS_ONSTACK;
1627 td->td_pflags |= TDP_ALTSTACK;
1629 if (uap->oss != NULL)
1630 error = copyout(&oss, uap->oss, sizeof(oss));
1634 #endif /* COMPAT_43 */
1636 #ifndef _SYS_SYSPROTO_H_
1637 struct sigaltstack_args {
1644 sys_sigaltstack(struct thread *td, struct sigaltstack_args *uap)
1649 if (uap->ss != NULL) {
1650 error = copyin(uap->ss, &ss, sizeof(ss));
1654 error = kern_sigaltstack(td, (uap->ss != NULL) ? &ss : NULL,
1655 (uap->oss != NULL) ? &oss : NULL);
1658 if (uap->oss != NULL)
1659 error = copyout(&oss, uap->oss, sizeof(stack_t));
1664 kern_sigaltstack(struct thread *td, stack_t *ss, stack_t *oss)
1666 struct proc *p = td->td_proc;
1669 oonstack = sigonstack(cpu_getstack(td));
1672 *oss = td->td_sigstk;
1673 oss->ss_flags = (td->td_pflags & TDP_ALTSTACK)
1674 ? ((oonstack) ? SS_ONSTACK : 0) : SS_DISABLE;
1680 if ((ss->ss_flags & ~SS_DISABLE) != 0)
1682 if (!(ss->ss_flags & SS_DISABLE)) {
1683 if (ss->ss_size < p->p_sysent->sv_minsigstksz)
1686 td->td_sigstk = *ss;
1687 td->td_pflags |= TDP_ALTSTACK;
1689 td->td_pflags &= ~TDP_ALTSTACK;
1695 struct killpg1_ctx {
1705 killpg1_sendsig(struct proc *p, bool notself, struct killpg1_ctx *arg)
1709 if (p->p_pid <= 1 || (p->p_flag & P_SYSTEM) != 0 ||
1710 (notself && p == arg->td->td_proc) || p->p_state == PRS_NEW)
1713 err = p_cansignal(arg->td, p, arg->sig);
1714 if (err == 0 && arg->sig != 0)
1715 pksignal(p, arg->sig, arg->ksi);
1721 else if (arg->ret == 0 && err != ESRCH && err != EPERM)
1726 * Common code for kill process group/broadcast kill.
1727 * cp is calling process.
1730 killpg1(struct thread *td, int sig, int pgid, int all, ksiginfo_t *ksi)
1734 struct killpg1_ctx arg;
1746 sx_slock(&allproc_lock);
1747 FOREACH_PROC_IN_SYSTEM(p) {
1748 killpg1_sendsig(p, true, &arg);
1750 sx_sunlock(&allproc_lock);
1752 sx_slock(&proctree_lock);
1755 * zero pgid means send to my process group.
1757 pgrp = td->td_proc->p_pgrp;
1760 pgrp = pgfind(pgid);
1762 sx_sunlock(&proctree_lock);
1766 sx_sunlock(&proctree_lock);
1767 LIST_FOREACH(p, &pgrp->pg_members, p_pglist) {
1768 killpg1_sendsig(p, false, &arg);
1772 MPASS(arg.ret != 0 || arg.found || !arg.sent);
1773 if (arg.ret == 0 && !arg.sent)
1774 arg.ret = arg.found ? EPERM : ESRCH;
1778 #ifndef _SYS_SYSPROTO_H_
1786 sys_kill(struct thread *td, struct kill_args *uap)
1789 return (kern_kill(td, uap->pid, uap->signum));
1793 kern_kill(struct thread *td, pid_t pid, int signum)
1800 * A process in capability mode can send signals only to himself.
1801 * The main rationale behind this is that abort(3) is implemented as
1802 * kill(getpid(), SIGABRT).
1804 if (IN_CAPABILITY_MODE(td) && pid != td->td_proc->p_pid)
1807 AUDIT_ARG_SIGNUM(signum);
1809 if ((u_int)signum > _SIG_MAXSIG)
1812 ksiginfo_init(&ksi);
1813 ksi.ksi_signo = signum;
1814 ksi.ksi_code = SI_USER;
1815 ksi.ksi_pid = td->td_proc->p_pid;
1816 ksi.ksi_uid = td->td_ucred->cr_ruid;
1819 /* kill single process */
1820 if ((p = pfind_any(pid)) == NULL)
1822 AUDIT_ARG_PROCESS(p);
1823 error = p_cansignal(td, p, signum);
1824 if (error == 0 && signum)
1825 pksignal(p, signum, &ksi);
1830 case -1: /* broadcast signal */
1831 return (killpg1(td, signum, 0, 1, &ksi));
1832 case 0: /* signal own process group */
1833 return (killpg1(td, signum, 0, 0, &ksi));
1834 default: /* negative explicit process group */
1835 return (killpg1(td, signum, -pid, 0, &ksi));
1841 sys_pdkill(struct thread *td, struct pdkill_args *uap)
1846 AUDIT_ARG_SIGNUM(uap->signum);
1847 AUDIT_ARG_FD(uap->fd);
1848 if ((u_int)uap->signum > _SIG_MAXSIG)
1851 error = procdesc_find(td, uap->fd, &cap_pdkill_rights, &p);
1854 AUDIT_ARG_PROCESS(p);
1855 error = p_cansignal(td, p, uap->signum);
1856 if (error == 0 && uap->signum)
1857 kern_psignal(p, uap->signum);
1862 #if defined(COMPAT_43)
1863 #ifndef _SYS_SYSPROTO_H_
1864 struct okillpg_args {
1871 okillpg(struct thread *td, struct okillpg_args *uap)
1875 AUDIT_ARG_SIGNUM(uap->signum);
1876 AUDIT_ARG_PID(uap->pgid);
1877 if ((u_int)uap->signum > _SIG_MAXSIG)
1880 ksiginfo_init(&ksi);
1881 ksi.ksi_signo = uap->signum;
1882 ksi.ksi_code = SI_USER;
1883 ksi.ksi_pid = td->td_proc->p_pid;
1884 ksi.ksi_uid = td->td_ucred->cr_ruid;
1885 return (killpg1(td, uap->signum, uap->pgid, 0, &ksi));
1887 #endif /* COMPAT_43 */
1889 #ifndef _SYS_SYSPROTO_H_
1890 struct sigqueue_args {
1893 /* union sigval */ void *value;
1897 sys_sigqueue(struct thread *td, struct sigqueue_args *uap)
1901 sv.sival_ptr = uap->value;
1903 return (kern_sigqueue(td, uap->pid, uap->signum, &sv));
1907 kern_sigqueue(struct thread *td, pid_t pid, int signum, union sigval *value)
1913 if ((u_int)signum > _SIG_MAXSIG)
1917 * Specification says sigqueue can only send signal to
1923 if ((p = pfind_any(pid)) == NULL)
1925 error = p_cansignal(td, p, signum);
1926 if (error == 0 && signum != 0) {
1927 ksiginfo_init(&ksi);
1928 ksi.ksi_flags = KSI_SIGQ;
1929 ksi.ksi_signo = signum;
1930 ksi.ksi_code = SI_QUEUE;
1931 ksi.ksi_pid = td->td_proc->p_pid;
1932 ksi.ksi_uid = td->td_ucred->cr_ruid;
1933 ksi.ksi_value = *value;
1934 error = pksignal(p, ksi.ksi_signo, &ksi);
1941 * Send a signal to a process group.
1944 gsignal(int pgid, int sig, ksiginfo_t *ksi)
1949 sx_slock(&proctree_lock);
1950 pgrp = pgfind(pgid);
1951 sx_sunlock(&proctree_lock);
1953 pgsignal(pgrp, sig, 0, ksi);
1960 * Send a signal to a process group. If checktty is 1,
1961 * limit to members which have a controlling terminal.
1964 pgsignal(struct pgrp *pgrp, int sig, int checkctty, ksiginfo_t *ksi)
1969 PGRP_LOCK_ASSERT(pgrp, MA_OWNED);
1970 LIST_FOREACH(p, &pgrp->pg_members, p_pglist) {
1972 if (p->p_state == PRS_NORMAL &&
1973 (checkctty == 0 || p->p_flag & P_CONTROLT))
1974 pksignal(p, sig, ksi);
1981 * Recalculate the signal mask and reset the signal disposition after
1982 * usermode frame for delivery is formed. Should be called after
1983 * mach-specific routine, because sysent->sv_sendsig() needs correct
1984 * ps_siginfo and signal mask.
1987 postsig_done(int sig, struct thread *td, struct sigacts *ps)
1991 mtx_assert(&ps->ps_mtx, MA_OWNED);
1992 td->td_ru.ru_nsignals++;
1993 mask = ps->ps_catchmask[_SIG_IDX(sig)];
1994 if (!SIGISMEMBER(ps->ps_signodefer, sig))
1995 SIGADDSET(mask, sig);
1996 kern_sigprocmask(td, SIG_BLOCK, &mask, NULL,
1997 SIGPROCMASK_PROC_LOCKED | SIGPROCMASK_PS_LOCKED);
1998 if (SIGISMEMBER(ps->ps_sigreset, sig))
2003 * Send a signal caused by a trap to the current thread. If it will be
2004 * caught immediately, deliver it with correct code. Otherwise, post it
2008 trapsignal(struct thread *td, ksiginfo_t *ksi)
2016 sig = ksi->ksi_signo;
2017 KASSERT(_SIG_VALID(sig), ("invalid signal"));
2019 sigfastblock_fetch(td);
2022 mtx_lock(&ps->ps_mtx);
2023 sigmask = td->td_sigmask;
2024 if (td->td_sigblock_val != 0)
2025 SIGSETOR(sigmask, fastblock_mask);
2026 if ((p->p_flag & P_TRACED) == 0 && SIGISMEMBER(ps->ps_sigcatch, sig) &&
2027 !SIGISMEMBER(sigmask, sig)) {
2029 if (KTRPOINT(curthread, KTR_PSIG))
2030 ktrpsig(sig, ps->ps_sigact[_SIG_IDX(sig)],
2031 &td->td_sigmask, ksi->ksi_code);
2033 (*p->p_sysent->sv_sendsig)(ps->ps_sigact[_SIG_IDX(sig)],
2034 ksi, &td->td_sigmask);
2035 postsig_done(sig, td, ps);
2036 mtx_unlock(&ps->ps_mtx);
2039 * Avoid a possible infinite loop if the thread
2040 * masking the signal or process is ignoring the
2043 if (kern_forcesigexit && (SIGISMEMBER(sigmask, sig) ||
2044 ps->ps_sigact[_SIG_IDX(sig)] == SIG_IGN)) {
2045 SIGDELSET(td->td_sigmask, sig);
2046 SIGDELSET(ps->ps_sigcatch, sig);
2047 SIGDELSET(ps->ps_sigignore, sig);
2048 ps->ps_sigact[_SIG_IDX(sig)] = SIG_DFL;
2049 td->td_pflags &= ~TDP_SIGFASTBLOCK;
2050 td->td_sigblock_val = 0;
2052 mtx_unlock(&ps->ps_mtx);
2053 p->p_sig = sig; /* XXX to verify code */
2054 tdsendsignal(p, td, sig, ksi);
2059 static struct thread *
2060 sigtd(struct proc *p, int sig, bool fast_sigblock)
2062 struct thread *td, *signal_td;
2064 PROC_LOCK_ASSERT(p, MA_OWNED);
2065 MPASS(!fast_sigblock || p == curproc);
2068 * Check if current thread can handle the signal without
2069 * switching context to another thread.
2071 if (curproc == p && !SIGISMEMBER(curthread->td_sigmask, sig) &&
2072 (!fast_sigblock || curthread->td_sigblock_val == 0))
2075 FOREACH_THREAD_IN_PROC(p, td) {
2076 if (!SIGISMEMBER(td->td_sigmask, sig) && (!fast_sigblock ||
2077 td != curthread || td->td_sigblock_val == 0)) {
2082 if (signal_td == NULL)
2083 signal_td = FIRST_THREAD_IN_PROC(p);
2088 * Send the signal to the process. If the signal has an action, the action
2089 * is usually performed by the target process rather than the caller; we add
2090 * the signal to the set of pending signals for the process.
2093 * o When a stop signal is sent to a sleeping process that takes the
2094 * default action, the process is stopped without awakening it.
2095 * o SIGCONT restarts stopped processes (or puts them back to sleep)
2096 * regardless of the signal action (eg, blocked or ignored).
2098 * Other ignored signals are discarded immediately.
2100 * NB: This function may be entered from the debugger via the "kill" DDB
2101 * command. There is little that can be done to mitigate the possibly messy
2102 * side effects of this unwise possibility.
2105 kern_psignal(struct proc *p, int sig)
2109 ksiginfo_init(&ksi);
2110 ksi.ksi_signo = sig;
2111 ksi.ksi_code = SI_KERNEL;
2112 (void) tdsendsignal(p, NULL, sig, &ksi);
2116 pksignal(struct proc *p, int sig, ksiginfo_t *ksi)
2119 return (tdsendsignal(p, NULL, sig, ksi));
2122 /* Utility function for finding a thread to send signal event to. */
2124 sigev_findtd(struct proc *p, struct sigevent *sigev, struct thread **ttd)
2128 if (sigev->sigev_notify == SIGEV_THREAD_ID) {
2129 td = tdfind(sigev->sigev_notify_thread_id, p->p_pid);
2141 tdsignal(struct thread *td, int sig)
2145 ksiginfo_init(&ksi);
2146 ksi.ksi_signo = sig;
2147 ksi.ksi_code = SI_KERNEL;
2148 (void) tdsendsignal(td->td_proc, td, sig, &ksi);
2152 tdksignal(struct thread *td, int sig, ksiginfo_t *ksi)
2155 (void) tdsendsignal(td->td_proc, td, sig, ksi);
2159 sig_sleepq_abort(struct thread *td, int intrval)
2161 THREAD_LOCK_ASSERT(td, MA_OWNED);
2163 if (intrval == 0 && (td->td_flags & TDF_SIGWAIT) == 0) {
2167 return (sleepq_abort(td, intrval));
2171 tdsendsignal(struct proc *p, struct thread *td, int sig, ksiginfo_t *ksi)
2174 sigqueue_t *sigqueue;
2181 MPASS(td == NULL || p == td->td_proc);
2182 PROC_LOCK_ASSERT(p, MA_OWNED);
2184 if (!_SIG_VALID(sig))
2185 panic("%s(): invalid signal %d", __func__, sig);
2187 KASSERT(ksi == NULL || !KSI_ONQ(ksi), ("%s: ksi on queue", __func__));
2190 * IEEE Std 1003.1-2001: return success when killing a zombie.
2192 if (p->p_state == PRS_ZOMBIE) {
2193 if (ksi && (ksi->ksi_flags & KSI_INS))
2194 ksiginfo_tryfree(ksi);
2199 KNOTE_LOCKED(p->p_klist, NOTE_SIGNAL | sig);
2200 prop = sigprop(sig);
2203 td = sigtd(p, sig, false);
2204 sigqueue = &p->p_sigqueue;
2206 sigqueue = &td->td_sigqueue;
2208 SDT_PROBE3(proc, , , signal__send, td, p, sig);
2211 * If the signal is being ignored, then we forget about it
2212 * immediately, except when the target process executes
2213 * sigwait(). (Note: we don't set SIGCONT in ps_sigignore,
2214 * and if it is set to SIG_IGN, action will be SIG_DFL here.)
2216 mtx_lock(&ps->ps_mtx);
2217 if (SIGISMEMBER(ps->ps_sigignore, sig)) {
2218 if (kern_sig_discard_ign &&
2219 (p->p_sysent->sv_flags & SV_SIG_DISCIGN) == 0) {
2220 SDT_PROBE3(proc, , , signal__discard, td, p, sig);
2222 mtx_unlock(&ps->ps_mtx);
2223 if (ksi && (ksi->ksi_flags & KSI_INS))
2224 ksiginfo_tryfree(ksi);
2231 if (SIGISMEMBER(td->td_sigmask, sig))
2233 else if (SIGISMEMBER(ps->ps_sigcatch, sig))
2237 if (SIGISMEMBER(ps->ps_sigintr, sig))
2242 mtx_unlock(&ps->ps_mtx);
2244 if (prop & SIGPROP_CONT)
2245 sigqueue_delete_stopmask_proc(p);
2246 else if (prop & SIGPROP_STOP) {
2248 * If sending a tty stop signal to a member of an orphaned
2249 * process group, discard the signal here if the action
2250 * is default; don't stop the process below if sleeping,
2251 * and don't clear any pending SIGCONT.
2253 if ((prop & SIGPROP_TTYSTOP) != 0 &&
2254 (p->p_pgrp->pg_flags & PGRP_ORPHANED) != 0 &&
2255 action == SIG_DFL) {
2256 if (ksi && (ksi->ksi_flags & KSI_INS))
2257 ksiginfo_tryfree(ksi);
2260 sigqueue_delete_proc(p, SIGCONT);
2261 if (p->p_flag & P_CONTINUED) {
2262 p->p_flag &= ~P_CONTINUED;
2263 PROC_LOCK(p->p_pptr);
2264 sigqueue_take(p->p_ksi);
2265 PROC_UNLOCK(p->p_pptr);
2269 ret = sigqueue_add(sigqueue, sig, ksi);
2274 * Defer further processing for signals which are held,
2275 * except that stopped processes must be continued by SIGCONT.
2277 if (action == SIG_HOLD &&
2278 !((prop & SIGPROP_CONT) && (p->p_flag & P_STOPPED_SIG)))
2284 * Some signals have a process-wide effect and a per-thread
2285 * component. Most processing occurs when the process next
2286 * tries to cross the user boundary, however there are some
2287 * times when processing needs to be done immediately, such as
2288 * waking up threads so that they can cross the user boundary.
2289 * We try to do the per-process part here.
2291 if (P_SHOULDSTOP(p)) {
2292 KASSERT(!(p->p_flag & P_WEXIT),
2293 ("signal to stopped but exiting process"));
2294 if (sig == SIGKILL) {
2296 * If traced process is already stopped,
2297 * then no further action is necessary.
2299 if (p->p_flag & P_TRACED)
2302 * SIGKILL sets process running.
2303 * It will die elsewhere.
2304 * All threads must be restarted.
2306 p->p_flag &= ~P_STOPPED_SIG;
2310 if (prop & SIGPROP_CONT) {
2312 * If traced process is already stopped,
2313 * then no further action is necessary.
2315 if (p->p_flag & P_TRACED)
2318 * If SIGCONT is default (or ignored), we continue the
2319 * process but don't leave the signal in sigqueue as
2320 * it has no further action. If SIGCONT is held, we
2321 * continue the process and leave the signal in
2322 * sigqueue. If the process catches SIGCONT, let it
2323 * handle the signal itself. If it isn't waiting on
2324 * an event, it goes back to run state.
2325 * Otherwise, process goes back to sleep state.
2327 p->p_flag &= ~P_STOPPED_SIG;
2329 if (p->p_numthreads == p->p_suspcount) {
2331 p->p_flag |= P_CONTINUED;
2332 p->p_xsig = SIGCONT;
2333 PROC_LOCK(p->p_pptr);
2334 childproc_continued(p);
2335 PROC_UNLOCK(p->p_pptr);
2338 if (action == SIG_DFL) {
2339 thread_unsuspend(p);
2341 sigqueue_delete(sigqueue, sig);
2344 if (action == SIG_CATCH) {
2346 * The process wants to catch it so it needs
2347 * to run at least one thread, but which one?
2353 * The signal is not ignored or caught.
2355 thread_unsuspend(p);
2360 if (prop & SIGPROP_STOP) {
2362 * If traced process is already stopped,
2363 * then no further action is necessary.
2365 if (p->p_flag & P_TRACED)
2368 * Already stopped, don't need to stop again
2369 * (If we did the shell could get confused).
2370 * Just make sure the signal STOP bit set.
2372 p->p_flag |= P_STOPPED_SIG;
2373 sigqueue_delete(sigqueue, sig);
2378 * All other kinds of signals:
2379 * If a thread is sleeping interruptibly, simulate a
2380 * wakeup so that when it is continued it will be made
2381 * runnable and can look at the signal. However, don't make
2382 * the PROCESS runnable, leave it stopped.
2383 * It may run a bit until it hits a thread_suspend_check().
2387 if (TD_CAN_ABORT(td))
2388 wakeup_swapper = sig_sleepq_abort(td, intrval);
2394 * Mutexes are short lived. Threads waiting on them will
2395 * hit thread_suspend_check() soon.
2397 } else if (p->p_state == PRS_NORMAL) {
2398 if (p->p_flag & P_TRACED || action == SIG_CATCH) {
2399 tdsigwakeup(td, sig, action, intrval);
2403 MPASS(action == SIG_DFL);
2405 if (prop & SIGPROP_STOP) {
2406 if (p->p_flag & (P_PPWAIT|P_WEXIT))
2408 p->p_flag |= P_STOPPED_SIG;
2411 wakeup_swapper = sig_suspend_threads(td, p, 1);
2412 if (p->p_numthreads == p->p_suspcount) {
2414 * only thread sending signal to another
2415 * process can reach here, if thread is sending
2416 * signal to its process, because thread does
2417 * not suspend itself here, p_numthreads
2418 * should never be equal to p_suspcount.
2422 sigqueue_delete_proc(p, p->p_xsig);
2428 /* Not in "NORMAL" state. discard the signal. */
2429 sigqueue_delete(sigqueue, sig);
2434 * The process is not stopped so we need to apply the signal to all the
2438 tdsigwakeup(td, sig, action, intrval);
2440 thread_unsuspend(p);
2443 itimer_proc_continue(p);
2444 kqtimer_proc_continue(p);
2446 /* If we jump here, proc slock should not be owned. */
2447 PROC_SLOCK_ASSERT(p, MA_NOTOWNED);
2455 * The force of a signal has been directed against a single
2456 * thread. We need to see what we can do about knocking it
2457 * out of any sleep it may be in etc.
2460 tdsigwakeup(struct thread *td, int sig, sig_t action, int intrval)
2462 struct proc *p = td->td_proc;
2463 int prop, wakeup_swapper;
2465 PROC_LOCK_ASSERT(p, MA_OWNED);
2466 prop = sigprop(sig);
2471 * Bring the priority of a thread up if we want it to get
2472 * killed in this lifetime. Be careful to avoid bumping the
2473 * priority of the idle thread, since we still allow to signal
2476 if (action == SIG_DFL && (prop & SIGPROP_KILL) != 0 &&
2477 td->td_priority > PUSER && !TD_IS_IDLETHREAD(td))
2478 sched_prio(td, PUSER);
2479 if (TD_ON_SLEEPQ(td)) {
2481 * If thread is sleeping uninterruptibly
2482 * we can't interrupt the sleep... the signal will
2483 * be noticed when the process returns through
2484 * trap() or syscall().
2486 if ((td->td_flags & TDF_SINTR) == 0)
2489 * If SIGCONT is default (or ignored) and process is
2490 * asleep, we are finished; the process should not
2493 if ((prop & SIGPROP_CONT) && action == SIG_DFL) {
2496 sigqueue_delete(&p->p_sigqueue, sig);
2498 * It may be on either list in this state.
2499 * Remove from both for now.
2501 sigqueue_delete(&td->td_sigqueue, sig);
2506 * Don't awaken a sleeping thread for SIGSTOP if the
2507 * STOP signal is deferred.
2509 if ((prop & SIGPROP_STOP) != 0 && (td->td_flags & (TDF_SBDRY |
2510 TDF_SERESTART | TDF_SEINTR)) == TDF_SBDRY)
2514 * Give low priority threads a better chance to run.
2516 if (td->td_priority > PUSER && !TD_IS_IDLETHREAD(td))
2517 sched_prio(td, PUSER);
2519 wakeup_swapper = sig_sleepq_abort(td, intrval);
2527 * Other states do nothing with the signal immediately,
2528 * other than kicking ourselves if we are running.
2529 * It will either never be noticed, or noticed very soon.
2532 if (TD_IS_RUNNING(td) && td != curthread)
2542 ptrace_coredump(struct thread *td)
2545 struct thr_coredump_req *tcq;
2548 MPASS(td == curthread);
2550 PROC_LOCK_ASSERT(p, MA_OWNED);
2551 if ((td->td_dbgflags & TDB_COREDUMPRQ) == 0)
2553 KASSERT((p->p_flag & P_STOPPED_TRACE) != 0, ("not stopped"));
2555 tcq = td->td_coredump;
2556 KASSERT(tcq != NULL, ("td_coredump is NULL"));
2558 if (p->p_sysent->sv_coredump == NULL) {
2559 tcq->tc_error = ENOSYS;
2564 rl_cookie = vn_rangelock_wlock(tcq->tc_vp, 0, OFF_MAX);
2566 tcq->tc_error = p->p_sysent->sv_coredump(td, tcq->tc_vp,
2567 tcq->tc_limit, tcq->tc_flags);
2569 vn_rangelock_unlock(tcq->tc_vp, rl_cookie);
2572 td->td_dbgflags &= ~TDB_COREDUMPRQ;
2573 td->td_coredump = NULL;
2578 sig_suspend_threads(struct thread *td, struct proc *p, int sending)
2583 PROC_LOCK_ASSERT(p, MA_OWNED);
2584 PROC_SLOCK_ASSERT(p, MA_OWNED);
2585 MPASS(sending || td == curthread);
2588 FOREACH_THREAD_IN_PROC(p, td2) {
2590 td2->td_flags |= TDF_ASTPENDING | TDF_NEEDSUSPCHK;
2591 if ((TD_IS_SLEEPING(td2) || TD_IS_SWAPPED(td2)) &&
2592 (td2->td_flags & TDF_SINTR)) {
2593 if (td2->td_flags & TDF_SBDRY) {
2595 * Once a thread is asleep with
2596 * TDF_SBDRY and without TDF_SERESTART
2597 * or TDF_SEINTR set, it should never
2598 * become suspended due to this check.
2600 KASSERT(!TD_IS_SUSPENDED(td2),
2601 ("thread with deferred stops suspended"));
2602 if (TD_SBDRY_INTR(td2)) {
2603 wakeup_swapper |= sleepq_abort(td2,
2604 TD_SBDRY_ERRNO(td2));
2607 } else if (!TD_IS_SUSPENDED(td2))
2608 thread_suspend_one(td2);
2609 } else if (!TD_IS_SUSPENDED(td2)) {
2610 if (sending || td != td2)
2611 td2->td_flags |= TDF_ASTPENDING;
2613 if (TD_IS_RUNNING(td2) && td2 != td)
2614 forward_signal(td2);
2619 return (wakeup_swapper);
2623 * Stop the process for an event deemed interesting to the debugger. If si is
2624 * non-NULL, this is a signal exchange; the new signal requested by the
2625 * debugger will be returned for handling. If si is NULL, this is some other
2626 * type of interesting event. The debugger may request a signal be delivered in
2627 * that case as well, however it will be deferred until it can be handled.
2630 ptracestop(struct thread *td, int sig, ksiginfo_t *si)
2632 struct proc *p = td->td_proc;
2636 PROC_LOCK_ASSERT(p, MA_OWNED);
2637 KASSERT(!(p->p_flag & P_WEXIT), ("Stopping exiting process"));
2638 WITNESS_WARN(WARN_GIANTOK | WARN_SLEEPOK,
2639 &p->p_mtx.lock_object, "Stopping for traced signal");
2643 if (si == NULL || (si->ksi_flags & KSI_PTRACE) == 0) {
2644 td->td_dbgflags |= TDB_XSIG;
2645 CTR4(KTR_PTRACE, "ptracestop: tid %d (pid %d) flags %#x sig %d",
2646 td->td_tid, p->p_pid, td->td_dbgflags, sig);
2648 while ((p->p_flag & P_TRACED) && (td->td_dbgflags & TDB_XSIG)) {
2651 * Ensure that, if we've been PT_KILLed, the
2652 * exit status reflects that. Another thread
2653 * may also be in ptracestop(), having just
2654 * received the SIGKILL, but this thread was
2655 * unsuspended first.
2657 td->td_dbgflags &= ~TDB_XSIG;
2658 td->td_xsig = SIGKILL;
2662 if (p->p_flag & P_SINGLE_EXIT &&
2663 !(td->td_dbgflags & TDB_EXIT)) {
2665 * Ignore ptrace stops except for thread exit
2666 * events when the process exits.
2668 td->td_dbgflags &= ~TDB_XSIG;
2674 * Make wait(2) work. Ensure that right after the
2675 * attach, the thread which was decided to become the
2676 * leader of attach gets reported to the waiter.
2677 * Otherwise, just avoid overwriting another thread's
2678 * assignment to p_xthread. If another thread has
2679 * already set p_xthread, the current thread will get
2680 * a chance to report itself upon the next iteration.
2682 if ((td->td_dbgflags & TDB_FSTP) != 0 ||
2683 ((p->p_flag2 & P2_PTRACE_FSTP) == 0 &&
2684 p->p_xthread == NULL)) {
2689 * If we are on sleepqueue already,
2690 * let sleepqueue code decide if it
2691 * needs to go sleep after attach.
2693 if (td->td_wchan == NULL)
2694 td->td_dbgflags &= ~TDB_FSTP;
2696 p->p_flag2 &= ~P2_PTRACE_FSTP;
2697 p->p_flag |= P_STOPPED_SIG | P_STOPPED_TRACE;
2698 sig_suspend_threads(td, p, 0);
2700 if ((td->td_dbgflags & TDB_STOPATFORK) != 0) {
2701 td->td_dbgflags &= ~TDB_STOPATFORK;
2704 td->td_dbgflags |= TDB_SSWITCH;
2705 thread_suspend_switch(td, p);
2706 td->td_dbgflags &= ~TDB_SSWITCH;
2707 if ((td->td_dbgflags & TDB_COREDUMPRQ) != 0) {
2709 ptrace_coredump(td);
2713 if (p->p_xthread == td)
2714 p->p_xthread = NULL;
2715 if (!(p->p_flag & P_TRACED))
2717 if (td->td_dbgflags & TDB_SUSPEND) {
2718 if (p->p_flag & P_SINGLE_EXIT)
2726 if (si != NULL && sig == td->td_xsig) {
2727 /* Parent wants us to take the original signal unchanged. */
2728 si->ksi_flags |= KSI_HEAD;
2729 if (sigqueue_add(&td->td_sigqueue, sig, si) != 0)
2731 } else if (td->td_xsig != 0) {
2733 * If parent wants us to take a new signal, then it will leave
2734 * it in td->td_xsig; otherwise we just look for signals again.
2736 ksiginfo_init(&ksi);
2737 ksi.ksi_signo = td->td_xsig;
2738 ksi.ksi_flags |= KSI_PTRACE;
2739 td2 = sigtd(p, td->td_xsig, false);
2740 tdsendsignal(p, td2, td->td_xsig, &ksi);
2745 return (td->td_xsig);
2749 reschedule_signals(struct proc *p, sigset_t block, int flags)
2754 bool fastblk, pslocked;
2756 PROC_LOCK_ASSERT(p, MA_OWNED);
2758 pslocked = (flags & SIGPROCMASK_PS_LOCKED) != 0;
2759 mtx_assert(&ps->ps_mtx, pslocked ? MA_OWNED : MA_NOTOWNED);
2760 if (SIGISEMPTY(p->p_siglist))
2762 SIGSETAND(block, p->p_siglist);
2763 fastblk = (flags & SIGPROCMASK_FASTBLK) != 0;
2764 SIG_FOREACH(sig, &block) {
2765 td = sigtd(p, sig, fastblk);
2768 * If sigtd() selected us despite sigfastblock is
2769 * blocking, do not activate AST or wake us, to avoid
2770 * loop in AST handler.
2772 if (fastblk && td == curthread)
2777 mtx_lock(&ps->ps_mtx);
2778 if (p->p_flag & P_TRACED ||
2779 (SIGISMEMBER(ps->ps_sigcatch, sig) &&
2780 !SIGISMEMBER(td->td_sigmask, sig))) {
2781 tdsigwakeup(td, sig, SIG_CATCH,
2782 (SIGISMEMBER(ps->ps_sigintr, sig) ? EINTR :
2786 mtx_unlock(&ps->ps_mtx);
2791 tdsigcleanup(struct thread *td)
2797 PROC_LOCK_ASSERT(p, MA_OWNED);
2799 sigqueue_flush(&td->td_sigqueue);
2800 if (p->p_numthreads == 1)
2804 * Since we cannot handle signals, notify signal post code
2805 * about this by filling the sigmask.
2807 * Also, if needed, wake up thread(s) that do not block the
2808 * same signals as the exiting thread, since the thread might
2809 * have been selected for delivery and woken up.
2811 SIGFILLSET(unblocked);
2812 SIGSETNAND(unblocked, td->td_sigmask);
2813 SIGFILLSET(td->td_sigmask);
2814 reschedule_signals(p, unblocked, 0);
2819 sigdeferstop_curr_flags(int cflags)
2822 MPASS((cflags & (TDF_SEINTR | TDF_SERESTART)) == 0 ||
2823 (cflags & TDF_SBDRY) != 0);
2824 return (cflags & (TDF_SBDRY | TDF_SEINTR | TDF_SERESTART));
2828 * Defer the delivery of SIGSTOP for the current thread, according to
2829 * the requested mode. Returns previous flags, which must be restored
2830 * by sigallowstop().
2832 * TDF_SBDRY, TDF_SEINTR, and TDF_SERESTART flags are only set and
2833 * cleared by the current thread, which allow the lock-less read-only
2837 sigdeferstop_impl(int mode)
2843 cflags = sigdeferstop_curr_flags(td->td_flags);
2845 case SIGDEFERSTOP_NOP:
2848 case SIGDEFERSTOP_OFF:
2851 case SIGDEFERSTOP_SILENT:
2852 nflags = (cflags | TDF_SBDRY) & ~(TDF_SEINTR | TDF_SERESTART);
2854 case SIGDEFERSTOP_EINTR:
2855 nflags = (cflags | TDF_SBDRY | TDF_SEINTR) & ~TDF_SERESTART;
2857 case SIGDEFERSTOP_ERESTART:
2858 nflags = (cflags | TDF_SBDRY | TDF_SERESTART) & ~TDF_SEINTR;
2861 panic("sigdeferstop: invalid mode %x", mode);
2864 if (cflags == nflags)
2865 return (SIGDEFERSTOP_VAL_NCHG);
2867 td->td_flags = (td->td_flags & ~cflags) | nflags;
2873 * Restores the STOP handling mode, typically permitting the delivery
2874 * of SIGSTOP for the current thread. This does not immediately
2875 * suspend if a stop was posted. Instead, the thread will suspend
2876 * either via ast() or a subsequent interruptible sleep.
2879 sigallowstop_impl(int prev)
2884 KASSERT(prev != SIGDEFERSTOP_VAL_NCHG, ("failed sigallowstop"));
2885 KASSERT((prev & ~(TDF_SBDRY | TDF_SEINTR | TDF_SERESTART)) == 0,
2886 ("sigallowstop: incorrect previous mode %x", prev));
2888 cflags = sigdeferstop_curr_flags(td->td_flags);
2889 if (cflags != prev) {
2891 td->td_flags = (td->td_flags & ~cflags) | prev;
2900 SIGSTATUS_SBDRY_STOP,
2904 * The thread has signal "sig" pending. Figure out what to do with it:
2906 * _HANDLE -> the caller should handle the signal
2907 * _HANDLED -> handled internally, reload pending signal set
2908 * _IGNORE -> ignored, remove from the set of pending signals and try the
2909 * next pending signal
2910 * _SBDRY_STOP -> the signal should stop the thread but this is not
2911 * permitted in the current context
2913 static enum sigstatus
2914 sigprocess(struct thread *td, int sig)
2918 struct sigqueue *queue;
2922 KASSERT(_SIG_VALID(sig), ("%s: invalid signal %d", __func__, sig));
2926 mtx_assert(&ps->ps_mtx, MA_OWNED);
2927 PROC_LOCK_ASSERT(p, MA_OWNED);
2930 * We should allow pending but ignored signals below
2931 * if there is sigwait() active, or P_TRACED was
2932 * on when they were posted.
2934 if (SIGISMEMBER(ps->ps_sigignore, sig) &&
2935 (p->p_flag & P_TRACED) == 0 &&
2936 (td->td_flags & TDF_SIGWAIT) == 0) {
2937 return (SIGSTATUS_IGNORE);
2941 * If the process is going to single-thread mode to prepare
2942 * for exit, there is no sense in delivering any signal
2943 * to usermode. Another important consequence is that
2944 * msleep(..., PCATCH, ...) now is only interruptible by a
2947 if ((p->p_flag2 & P2_WEXIT) != 0)
2948 return (SIGSTATUS_IGNORE);
2950 if ((p->p_flag & (P_TRACED | P_PPTRACE)) == P_TRACED) {
2952 * If traced, always stop.
2953 * Remove old signal from queue before the stop.
2954 * XXX shrug off debugger, it causes siginfo to
2957 queue = &td->td_sigqueue;
2958 ksiginfo_init(&ksi);
2959 if (sigqueue_get(queue, sig, &ksi) == 0) {
2960 queue = &p->p_sigqueue;
2961 sigqueue_get(queue, sig, &ksi);
2963 td->td_si = ksi.ksi_info;
2965 mtx_unlock(&ps->ps_mtx);
2966 sig = ptracestop(td, sig, &ksi);
2967 mtx_lock(&ps->ps_mtx);
2969 td->td_si.si_signo = 0;
2972 * Keep looking if the debugger discarded or
2973 * replaced the signal.
2976 return (SIGSTATUS_HANDLED);
2979 * If the signal became masked, re-queue it.
2981 if (SIGISMEMBER(td->td_sigmask, sig)) {
2982 ksi.ksi_flags |= KSI_HEAD;
2983 sigqueue_add(&p->p_sigqueue, sig, &ksi);
2984 return (SIGSTATUS_HANDLED);
2988 * If the traced bit got turned off, requeue the signal and
2989 * reload the set of pending signals. This ensures that p_sig*
2990 * and p_sigact are consistent.
2992 if ((p->p_flag & P_TRACED) == 0) {
2993 if ((ksi.ksi_flags & KSI_PTRACE) == 0) {
2994 ksi.ksi_flags |= KSI_HEAD;
2995 sigqueue_add(queue, sig, &ksi);
2997 return (SIGSTATUS_HANDLED);
3002 * Decide whether the signal should be returned.
3003 * Return the signal's number, or fall through
3004 * to clear it from the pending mask.
3006 switch ((intptr_t)p->p_sigacts->ps_sigact[_SIG_IDX(sig)]) {
3007 case (intptr_t)SIG_DFL:
3009 * Don't take default actions on system processes.
3011 if (p->p_pid <= 1) {
3014 * Are you sure you want to ignore SIGSEGV
3017 printf("Process (pid %lu) got signal %d\n",
3018 (u_long)p->p_pid, sig);
3020 return (SIGSTATUS_IGNORE);
3024 * If there is a pending stop signal to process with
3025 * default action, stop here, then clear the signal.
3026 * Traced or exiting processes should ignore stops.
3027 * Additionally, a member of an orphaned process group
3028 * should ignore tty stops.
3030 prop = sigprop(sig);
3031 if (prop & SIGPROP_STOP) {
3032 mtx_unlock(&ps->ps_mtx);
3033 if ((p->p_flag & (P_TRACED | P_WEXIT |
3034 P_SINGLE_EXIT)) != 0 || ((p->p_pgrp->
3035 pg_flags & PGRP_ORPHANED) != 0 &&
3036 (prop & SIGPROP_TTYSTOP) != 0)) {
3037 mtx_lock(&ps->ps_mtx);
3038 return (SIGSTATUS_IGNORE);
3040 if (TD_SBDRY_INTR(td)) {
3041 KASSERT((td->td_flags & TDF_SBDRY) != 0,
3042 ("lost TDF_SBDRY"));
3043 mtx_lock(&ps->ps_mtx);
3044 return (SIGSTATUS_SBDRY_STOP);
3046 WITNESS_WARN(WARN_GIANTOK | WARN_SLEEPOK,
3047 &p->p_mtx.lock_object, "Catching SIGSTOP");
3048 sigqueue_delete(&td->td_sigqueue, sig);
3049 sigqueue_delete(&p->p_sigqueue, sig);
3050 p->p_flag |= P_STOPPED_SIG;
3053 sig_suspend_threads(td, p, 0);
3054 thread_suspend_switch(td, p);
3056 mtx_lock(&ps->ps_mtx);
3057 return (SIGSTATUS_HANDLED);
3058 } else if ((prop & SIGPROP_IGNORE) != 0 &&
3059 (td->td_flags & TDF_SIGWAIT) == 0) {
3061 * Default action is to ignore; drop it if
3062 * not in kern_sigtimedwait().
3064 return (SIGSTATUS_IGNORE);
3066 return (SIGSTATUS_HANDLE);
3069 case (intptr_t)SIG_IGN:
3070 if ((td->td_flags & TDF_SIGWAIT) == 0)
3071 return (SIGSTATUS_IGNORE);
3073 return (SIGSTATUS_HANDLE);
3077 * This signal has an action, let postsig() process it.
3079 return (SIGSTATUS_HANDLE);
3084 * If the current process has received a signal (should be caught or cause
3085 * termination, should interrupt current syscall), return the signal number.
3086 * Stop signals with default action are processed immediately, then cleared;
3087 * they aren't returned. This is checked after each entry to the system for
3088 * a syscall or trap (though this can usually be done without calling
3089 * issignal by checking the pending signal masks in cursig.) The normal call
3092 * while (sig = cursig(curthread))
3096 issignal(struct thread *td)
3099 sigset_t sigpending;
3103 PROC_LOCK_ASSERT(p, MA_OWNED);
3106 sigpending = td->td_sigqueue.sq_signals;
3107 SIGSETOR(sigpending, p->p_sigqueue.sq_signals);
3108 SIGSETNAND(sigpending, td->td_sigmask);
3110 if ((p->p_flag & P_PPWAIT) != 0 || (td->td_flags &
3111 (TDF_SBDRY | TDF_SERESTART | TDF_SEINTR)) == TDF_SBDRY)
3112 SIG_STOPSIGMASK(sigpending);
3113 if (SIGISEMPTY(sigpending)) /* no signal to send */
3117 * Do fast sigblock if requested by usermode. Since
3118 * we do know that there was a signal pending at this
3119 * point, set the FAST_SIGBLOCK_PEND as indicator for
3120 * usermode to perform a dummy call to
3121 * FAST_SIGBLOCK_UNBLOCK, which causes immediate
3122 * delivery of postponed pending signal.
3124 if ((td->td_pflags & TDP_SIGFASTBLOCK) != 0) {
3125 if (td->td_sigblock_val != 0)
3126 SIGSETNAND(sigpending, fastblock_mask);
3127 if (SIGISEMPTY(sigpending)) {
3128 td->td_pflags |= TDP_SIGFASTPENDING;
3133 if ((p->p_flag & (P_TRACED | P_PPTRACE)) == P_TRACED &&
3134 (p->p_flag2 & P2_PTRACE_FSTP) != 0 &&
3135 SIGISMEMBER(sigpending, SIGSTOP)) {
3137 * If debugger just attached, always consume
3138 * SIGSTOP from ptrace(PT_ATTACH) first, to
3139 * execute the debugger attach ritual in
3142 td->td_dbgflags |= TDB_FSTP;
3143 SIGEMPTYSET(sigpending);
3144 SIGADDSET(sigpending, SIGSTOP);
3147 SIG_FOREACH(sig, &sigpending) {
3148 switch (sigprocess(td, sig)) {
3149 case SIGSTATUS_HANDLE:
3151 case SIGSTATUS_HANDLED:
3153 case SIGSTATUS_IGNORE:
3154 sigqueue_delete(&td->td_sigqueue, sig);
3155 sigqueue_delete(&p->p_sigqueue, sig);
3157 case SIGSTATUS_SBDRY_STOP:
3166 thread_stopped(struct proc *p)
3170 PROC_LOCK_ASSERT(p, MA_OWNED);
3171 PROC_SLOCK_ASSERT(p, MA_OWNED);
3175 if ((p->p_flag & P_STOPPED_SIG) && (n == p->p_numthreads)) {
3177 p->p_flag &= ~P_WAITED;
3178 PROC_LOCK(p->p_pptr);
3179 childproc_stopped(p, (p->p_flag & P_TRACED) ?
3180 CLD_TRAPPED : CLD_STOPPED);
3181 PROC_UNLOCK(p->p_pptr);
3187 * Take the action for the specified signal
3188 * from the current set of pending signals.
3198 sigset_t returnmask;
3200 KASSERT(sig != 0, ("postsig"));
3204 PROC_LOCK_ASSERT(p, MA_OWNED);
3206 mtx_assert(&ps->ps_mtx, MA_OWNED);
3207 ksiginfo_init(&ksi);
3208 if (sigqueue_get(&td->td_sigqueue, sig, &ksi) == 0 &&
3209 sigqueue_get(&p->p_sigqueue, sig, &ksi) == 0)
3211 ksi.ksi_signo = sig;
3212 if (ksi.ksi_code == SI_TIMER)
3213 itimer_accept(p, ksi.ksi_timerid, &ksi);
3214 action = ps->ps_sigact[_SIG_IDX(sig)];
3216 if (KTRPOINT(td, KTR_PSIG))
3217 ktrpsig(sig, action, td->td_pflags & TDP_OLDMASK ?
3218 &td->td_oldsigmask : &td->td_sigmask, ksi.ksi_code);
3221 if (action == SIG_DFL) {
3223 * Default action, where the default is to kill
3224 * the process. (Other cases were ignored above.)
3226 mtx_unlock(&ps->ps_mtx);
3227 proc_td_siginfo_capture(td, &ksi.ksi_info);
3232 * If we get here, the signal must be caught.
3234 KASSERT(action != SIG_IGN, ("postsig action %p", action));
3235 KASSERT(!SIGISMEMBER(td->td_sigmask, sig),
3236 ("postsig action: blocked sig %d", sig));
3239 * Set the new mask value and also defer further
3240 * occurrences of this signal.
3242 * Special case: user has done a sigsuspend. Here the
3243 * current mask is not of interest, but rather the
3244 * mask from before the sigsuspend is what we want
3245 * restored after the signal processing is completed.
3247 if (td->td_pflags & TDP_OLDMASK) {
3248 returnmask = td->td_oldsigmask;
3249 td->td_pflags &= ~TDP_OLDMASK;
3251 returnmask = td->td_sigmask;
3253 if (p->p_sig == sig) {
3256 (*p->p_sysent->sv_sendsig)(action, &ksi, &returnmask);
3257 postsig_done(sig, td, ps);
3263 sig_ast_checksusp(struct thread *td)
3265 struct proc *p __diagused;
3269 PROC_LOCK_ASSERT(p, MA_OWNED);
3271 if ((td->td_flags & TDF_NEEDSUSPCHK) == 0)
3274 ret = thread_suspend_check(1);
3275 MPASS(ret == 0 || ret == EINTR || ret == ERESTART);
3280 sig_ast_needsigchk(struct thread *td)
3287 PROC_LOCK_ASSERT(p, MA_OWNED);
3289 if ((td->td_flags & TDF_NEEDSIGCHK) == 0)
3293 mtx_lock(&ps->ps_mtx);
3296 mtx_unlock(&ps->ps_mtx);
3297 KASSERT((td->td_flags & TDF_SBDRY) != 0, ("lost TDF_SBDRY"));
3298 KASSERT(TD_SBDRY_INTR(td),
3299 ("lost TDF_SERESTART of TDF_SEINTR"));
3300 KASSERT((td->td_flags & (TDF_SEINTR | TDF_SERESTART)) !=
3301 (TDF_SEINTR | TDF_SERESTART),
3302 ("both TDF_SEINTR and TDF_SERESTART"));
3303 ret = TD_SBDRY_ERRNO(td);
3304 } else if (sig != 0) {
3305 ret = SIGISMEMBER(ps->ps_sigintr, sig) ? EINTR : ERESTART;
3306 mtx_unlock(&ps->ps_mtx);
3308 mtx_unlock(&ps->ps_mtx);
3313 * Do not go into sleep if this thread was the ptrace(2)
3314 * attach leader. cursig() consumed SIGSTOP from PT_ATTACH,
3315 * but we usually act on the signal by interrupting sleep, and
3316 * should do that here as well.
3318 if ((td->td_dbgflags & TDB_FSTP) != 0) {
3321 td->td_dbgflags &= ~TDB_FSTP;
3335 if ((td->td_flags & (TDF_NEEDSIGCHK | TDF_NEEDSUSPCHK)) == 0)
3341 ret = sig_ast_checksusp(td);
3343 ret = sig_ast_needsigchk(td);
3349 curproc_sigkilled(void)
3357 if ((td->td_flags & TDF_NEEDSIGCHK) == 0)
3363 mtx_lock(&ps->ps_mtx);
3364 res = SIGISMEMBER(td->td_sigqueue.sq_signals, SIGKILL) ||
3365 SIGISMEMBER(p->p_sigqueue.sq_signals, SIGKILL);
3366 mtx_unlock(&ps->ps_mtx);
3372 proc_wkilled(struct proc *p)
3375 PROC_LOCK_ASSERT(p, MA_OWNED);
3376 if ((p->p_flag & P_WKILLED) == 0) {
3377 p->p_flag |= P_WKILLED;
3379 * Notify swapper that there is a process to swap in.
3380 * The notification is racy, at worst it would take 10
3381 * seconds for the swapper process to notice.
3383 if ((p->p_flag & (P_INMEM | P_SWAPPINGIN)) == 0)
3389 * Kill the current process for stated reason.
3392 killproc(struct proc *p, const char *why)
3395 PROC_LOCK_ASSERT(p, MA_OWNED);
3396 CTR3(KTR_PROC, "killproc: proc %p (pid %d, %s)", p, p->p_pid,
3398 log(LOG_ERR, "pid %d (%s), jid %d, uid %d, was killed: %s\n",
3399 p->p_pid, p->p_comm, p->p_ucred->cr_prison->pr_id,
3400 p->p_ucred->cr_uid, why);
3402 kern_psignal(p, SIGKILL);
3406 * Force the current process to exit with the specified signal, dumping core
3407 * if appropriate. We bypass the normal tests for masked and caught signals,
3408 * allowing unrecoverable failures to terminate the process without changing
3409 * signal state. Mark the accounting record with the signal termination.
3410 * If dumping core, save the signal number for the debugger. Calls exit and
3414 sigexit(struct thread *td, int sig)
3416 struct proc *p = td->td_proc;
3418 PROC_LOCK_ASSERT(p, MA_OWNED);
3419 proc_set_p2_wexit(p);
3421 p->p_acflag |= AXSIG;
3423 * We must be single-threading to generate a core dump. This
3424 * ensures that the registers in the core file are up-to-date.
3425 * Also, the ELF dump handler assumes that the thread list doesn't
3426 * change out from under it.
3428 * XXX If another thread attempts to single-thread before us
3429 * (e.g. via fork()), we won't get a dump at all.
3431 if ((sigprop(sig) & SIGPROP_CORE) &&
3432 thread_single(p, SINGLE_NO_EXIT) == 0) {
3435 * Log signals which would cause core dumps
3436 * (Log as LOG_INFO to appease those who don't want
3438 * XXX : Todo, as well as euid, write out ruid too
3439 * Note that coredump() drops proc lock.
3441 if (coredump(td) == 0)
3443 if (kern_logsigexit)
3445 "pid %d (%s), jid %d, uid %d: exited on "
3446 "signal %d%s\n", p->p_pid, p->p_comm,
3447 p->p_ucred->cr_prison->pr_id,
3448 td->td_ucred->cr_uid,
3450 sig & WCOREFLAG ? " (core dumped)" : "");
3458 * Send queued SIGCHLD to parent when child process's state
3462 sigparent(struct proc *p, int reason, int status)
3464 PROC_LOCK_ASSERT(p, MA_OWNED);
3465 PROC_LOCK_ASSERT(p->p_pptr, MA_OWNED);
3467 if (p->p_ksi != NULL) {
3468 p->p_ksi->ksi_signo = SIGCHLD;
3469 p->p_ksi->ksi_code = reason;
3470 p->p_ksi->ksi_status = status;
3471 p->p_ksi->ksi_pid = p->p_pid;
3472 p->p_ksi->ksi_uid = p->p_ucred->cr_ruid;
3473 if (KSI_ONQ(p->p_ksi))
3476 pksignal(p->p_pptr, SIGCHLD, p->p_ksi);
3480 childproc_jobstate(struct proc *p, int reason, int sig)
3484 PROC_LOCK_ASSERT(p, MA_OWNED);
3485 PROC_LOCK_ASSERT(p->p_pptr, MA_OWNED);
3488 * Wake up parent sleeping in kern_wait(), also send
3489 * SIGCHLD to parent, but SIGCHLD does not guarantee
3490 * that parent will awake, because parent may masked
3493 p->p_pptr->p_flag |= P_STATCHILD;
3496 ps = p->p_pptr->p_sigacts;
3497 mtx_lock(&ps->ps_mtx);
3498 if ((ps->ps_flag & PS_NOCLDSTOP) == 0) {
3499 mtx_unlock(&ps->ps_mtx);
3500 sigparent(p, reason, sig);
3502 mtx_unlock(&ps->ps_mtx);
3506 childproc_stopped(struct proc *p, int reason)
3509 childproc_jobstate(p, reason, p->p_xsig);
3513 childproc_continued(struct proc *p)
3515 childproc_jobstate(p, CLD_CONTINUED, SIGCONT);
3519 childproc_exited(struct proc *p)
3523 if (WCOREDUMP(p->p_xsig)) {
3524 reason = CLD_DUMPED;
3525 status = WTERMSIG(p->p_xsig);
3526 } else if (WIFSIGNALED(p->p_xsig)) {
3527 reason = CLD_KILLED;
3528 status = WTERMSIG(p->p_xsig);
3530 reason = CLD_EXITED;
3531 status = p->p_xexit;
3534 * XXX avoid calling wakeup(p->p_pptr), the work is
3537 sigparent(p, reason, status);
3540 #define MAX_NUM_CORE_FILES 100000
3541 #ifndef NUM_CORE_FILES
3542 #define NUM_CORE_FILES 5
3544 CTASSERT(NUM_CORE_FILES >= 0 && NUM_CORE_FILES <= MAX_NUM_CORE_FILES);
3545 static int num_cores = NUM_CORE_FILES;
3548 sysctl_debug_num_cores_check (SYSCTL_HANDLER_ARGS)
3553 new_val = num_cores;
3554 error = sysctl_handle_int(oidp, &new_val, 0, req);
3555 if (error != 0 || req->newptr == NULL)
3557 if (new_val > MAX_NUM_CORE_FILES)
3558 new_val = MAX_NUM_CORE_FILES;
3561 num_cores = new_val;
3564 SYSCTL_PROC(_debug, OID_AUTO, ncores,
3565 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 0, sizeof(int),
3566 sysctl_debug_num_cores_check, "I",
3567 "Maximum number of generated process corefiles while using index format");
3569 #define GZIP_SUFFIX ".gz"
3570 #define ZSTD_SUFFIX ".zst"
3572 int compress_user_cores = 0;
3575 sysctl_compress_user_cores(SYSCTL_HANDLER_ARGS)
3579 val = compress_user_cores;
3580 error = sysctl_handle_int(oidp, &val, 0, req);
3581 if (error != 0 || req->newptr == NULL)
3583 if (val != 0 && !compressor_avail(val))
3585 compress_user_cores = val;
3588 SYSCTL_PROC(_kern, OID_AUTO, compress_user_cores,
3589 CTLTYPE_INT | CTLFLAG_RWTUN | CTLFLAG_NEEDGIANT, 0, sizeof(int),
3590 sysctl_compress_user_cores, "I",
3591 "Enable compression of user corefiles ("
3592 __XSTRING(COMPRESS_GZIP) " = gzip, "
3593 __XSTRING(COMPRESS_ZSTD) " = zstd)");
3595 int compress_user_cores_level = 6;
3596 SYSCTL_INT(_kern, OID_AUTO, compress_user_cores_level, CTLFLAG_RWTUN,
3597 &compress_user_cores_level, 0,
3598 "Corefile compression level");
3601 * Protect the access to corefilename[] by allproc_lock.
3603 #define corefilename_lock allproc_lock
3605 static char corefilename[MAXPATHLEN] = {"%N.core"};
3606 TUNABLE_STR("kern.corefile", corefilename, sizeof(corefilename));
3609 sysctl_kern_corefile(SYSCTL_HANDLER_ARGS)
3613 sx_xlock(&corefilename_lock);
3614 error = sysctl_handle_string(oidp, corefilename, sizeof(corefilename),
3616 sx_xunlock(&corefilename_lock);
3620 SYSCTL_PROC(_kern, OID_AUTO, corefile, CTLTYPE_STRING | CTLFLAG_RW |
3621 CTLFLAG_MPSAFE, 0, 0, sysctl_kern_corefile, "A",
3622 "Process corefile name format string");
3625 vnode_close_locked(struct thread *td, struct vnode *vp)
3629 vn_close(vp, FWRITE, td->td_ucred, td);
3633 * If the core format has a %I in it, then we need to check
3634 * for existing corefiles before defining a name.
3635 * To do this we iterate over 0..ncores to find a
3636 * non-existing core file name to use. If all core files are
3637 * already used we choose the oldest one.
3640 corefile_open_last(struct thread *td, char *name, int indexpos,
3641 int indexlen, int ncores, struct vnode **vpp)
3643 struct vnode *oldvp, *nextvp, *vp;
3645 struct nameidata nd;
3646 int error, i, flags, oflags, cmode;
3648 struct timespec lasttime;
3650 nextvp = oldvp = NULL;
3651 cmode = S_IRUSR | S_IWUSR;
3652 oflags = VN_OPEN_NOAUDIT | VN_OPEN_NAMECACHE |
3653 (capmode_coredump ? VN_OPEN_NOCAPCHECK : 0);
3655 for (i = 0; i < ncores; i++) {
3656 flags = O_CREAT | FWRITE | O_NOFOLLOW;
3658 ch = name[indexpos + indexlen];
3659 (void)snprintf(name + indexpos, indexlen + 1, "%.*u", indexlen,
3661 name[indexpos + indexlen] = ch;
3663 NDINIT(&nd, LOOKUP, NOFOLLOW, UIO_SYSSPACE, name);
3664 error = vn_open_cred(&nd, &flags, cmode, oflags, td->td_ucred,
3671 if ((flags & O_CREAT) == O_CREAT) {
3676 error = VOP_GETATTR(vp, &vattr, td->td_ucred);
3678 vnode_close_locked(td, vp);
3682 if (oldvp == NULL ||
3683 lasttime.tv_sec > vattr.va_mtime.tv_sec ||
3684 (lasttime.tv_sec == vattr.va_mtime.tv_sec &&
3685 lasttime.tv_nsec >= vattr.va_mtime.tv_nsec)) {
3687 vn_close(oldvp, FWRITE, td->td_ucred, td);
3690 lasttime = vattr.va_mtime;
3692 vnode_close_locked(td, vp);
3696 if (oldvp != NULL) {
3697 if (nextvp == NULL) {
3698 if ((td->td_proc->p_flag & P_SUGID) != 0) {
3700 vn_close(oldvp, FWRITE, td->td_ucred, td);
3703 error = vn_lock(nextvp, LK_EXCLUSIVE);
3705 vn_close(nextvp, FWRITE, td->td_ucred,
3711 vn_close(oldvp, FWRITE, td->td_ucred, td);
3716 vnode_close_locked(td, oldvp);
3725 * corefile_open(comm, uid, pid, td, compress, vpp, namep)
3726 * Expand the name described in corefilename, using name, uid, and pid
3727 * and open/create core file.
3728 * corefilename is a printf-like string, with three format specifiers:
3729 * %N name of process ("name")
3730 * %P process id (pid)
3732 * For example, "%N.core" is the default; they can be disabled completely
3733 * by using "/dev/null", or all core files can be stored in "/cores/%U/%N-%P".
3734 * This is controlled by the sysctl variable kern.corefile (see above).
3737 corefile_open(const char *comm, uid_t uid, pid_t pid, struct thread *td,
3738 int compress, int signum, struct vnode **vpp, char **namep)
3741 struct nameidata nd;
3743 char *hostname, *name;
3744 int cmode, error, flags, i, indexpos, indexlen, oflags, ncores;
3747 format = corefilename;
3748 name = malloc(MAXPATHLEN, M_TEMP, M_WAITOK | M_ZERO);
3752 (void)sbuf_new(&sb, name, MAXPATHLEN, SBUF_FIXEDLEN);
3753 sx_slock(&corefilename_lock);
3754 for (i = 0; format[i] != '\0'; i++) {
3755 switch (format[i]) {
3756 case '%': /* Format character */
3758 switch (format[i]) {
3760 sbuf_putc(&sb, '%');
3762 case 'H': /* hostname */
3763 if (hostname == NULL) {
3764 hostname = malloc(MAXHOSTNAMELEN,
3767 getcredhostname(td->td_ucred, hostname,
3769 sbuf_printf(&sb, "%s", hostname);
3771 case 'I': /* autoincrementing index */
3772 if (indexpos != -1) {
3773 sbuf_printf(&sb, "%%I");
3777 indexpos = sbuf_len(&sb);
3778 sbuf_printf(&sb, "%u", ncores - 1);
3779 indexlen = sbuf_len(&sb) - indexpos;
3781 case 'N': /* process name */
3782 sbuf_printf(&sb, "%s", comm);
3784 case 'P': /* process id */
3785 sbuf_printf(&sb, "%u", pid);
3787 case 'S': /* signal number */
3788 sbuf_printf(&sb, "%i", signum);
3790 case 'U': /* user id */
3791 sbuf_printf(&sb, "%u", uid);
3795 "Unknown format character %c in "
3796 "corename `%s'\n", format[i], format);
3801 sbuf_putc(&sb, format[i]);
3805 sx_sunlock(&corefilename_lock);
3806 free(hostname, M_TEMP);
3807 if (compress == COMPRESS_GZIP)
3808 sbuf_printf(&sb, GZIP_SUFFIX);
3809 else if (compress == COMPRESS_ZSTD)
3810 sbuf_printf(&sb, ZSTD_SUFFIX);
3811 if (sbuf_error(&sb) != 0) {
3812 log(LOG_ERR, "pid %ld (%s), uid (%lu): corename is too "
3813 "long\n", (long)pid, comm, (u_long)uid);
3821 if (indexpos != -1) {
3822 error = corefile_open_last(td, name, indexpos, indexlen, ncores,
3826 "pid %d (%s), uid (%u): Path `%s' failed "
3827 "on initial open test, error = %d\n",
3828 pid, comm, uid, name, error);
3831 cmode = S_IRUSR | S_IWUSR;
3832 oflags = VN_OPEN_NOAUDIT | VN_OPEN_NAMECACHE |
3833 (capmode_coredump ? VN_OPEN_NOCAPCHECK : 0);
3834 flags = O_CREAT | FWRITE | O_NOFOLLOW;
3835 if ((td->td_proc->p_flag & P_SUGID) != 0)
3838 NDINIT(&nd, LOOKUP, NOFOLLOW, UIO_SYSSPACE, name);
3839 error = vn_open_cred(&nd, &flags, cmode, oflags, td->td_ucred,
3849 audit_proc_coredump(td, name, error);
3859 * Dump a process' core. The main routine does some
3860 * policy checking, and creates the name of the coredump;
3861 * then it passes on a vnode and a size limit to the process-specific
3862 * coredump routine if there is one; if there _is not_ one, it returns
3863 * ENOSYS; otherwise it returns the error from the process-specific routine.
3867 coredump(struct thread *td)
3869 struct proc *p = td->td_proc;
3870 struct ucred *cred = td->td_ucred;
3874 size_t fullpathsize;
3875 int error, error1, locked;
3876 char *name; /* name of corefile */
3879 char *fullpath, *freepath = NULL;
3882 PROC_LOCK_ASSERT(p, MA_OWNED);
3883 MPASS((p->p_flag & P_HADTHREADS) == 0 || p->p_singlethread == td);
3885 if (!do_coredump || (!sugid_coredump && (p->p_flag & P_SUGID) != 0) ||
3886 (p->p_flag2 & P2_NOTRACE) != 0) {
3892 * Note that the bulk of limit checking is done after
3893 * the corefile is created. The exception is if the limit
3894 * for corefiles is 0, in which case we don't bother
3895 * creating the corefile at all. This layout means that
3896 * a corefile is truncated instead of not being created,
3897 * if it is larger than the limit.
3899 limit = (off_t)lim_cur(td, RLIMIT_CORE);
3900 if (limit == 0 || racct_get_available(p, RACCT_CORE) == 0) {
3906 error = corefile_open(p->p_comm, cred->cr_uid, p->p_pid, td,
3907 compress_user_cores, p->p_sig, &vp, &name);
3912 * Don't dump to non-regular files or files with links.
3913 * Do not dump into system files. Effective user must own the corefile.
3915 if (vp->v_type != VREG || VOP_GETATTR(vp, &vattr, cred) != 0 ||
3916 vattr.va_nlink != 1 || (vp->v_vflag & VV_SYSTEM) != 0 ||
3917 vattr.va_uid != cred->cr_uid) {
3925 /* Postpone other writers, including core dumps of other processes. */
3926 rl_cookie = vn_rangelock_wlock(vp, 0, OFF_MAX);
3928 lf.l_whence = SEEK_SET;
3931 lf.l_type = F_WRLCK;
3932 locked = (VOP_ADVLOCK(vp, (caddr_t)p, F_SETLK, &lf, F_FLOCK) == 0);
3936 if (set_core_nodump_flag)
3937 vattr.va_flags = UF_NODUMP;
3938 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
3939 VOP_SETATTR(vp, &vattr, cred);
3942 p->p_acflag |= ACORE;
3945 if (p->p_sysent->sv_coredump != NULL) {
3946 error = p->p_sysent->sv_coredump(td, vp, limit, 0);
3952 lf.l_type = F_UNLCK;
3953 VOP_ADVLOCK(vp, (caddr_t)p, F_UNLCK, &lf, F_FLOCK);
3955 vn_rangelock_unlock(vp, rl_cookie);
3958 * Notify the userland helper that a process triggered a core dump.
3959 * This allows the helper to run an automated debugging session.
3961 if (error != 0 || coredump_devctl == 0)
3963 sb = sbuf_new_auto();
3964 if (vn_fullpath_global(p->p_textvp, &fullpath, &freepath) != 0)
3966 sbuf_printf(sb, "comm=\"");
3967 devctl_safe_quote_sb(sb, fullpath);
3968 free(freepath, M_TEMP);
3969 sbuf_printf(sb, "\" core=\"");
3972 * We can't lookup core file vp directly. When we're replacing a core, and
3973 * other random times, we flush the name cache, so it will fail. Instead,
3974 * if the path of the core is relative, add the current dir in front if it.
3976 if (name[0] != '/') {
3977 fullpathsize = MAXPATHLEN;
3978 freepath = malloc(fullpathsize, M_TEMP, M_WAITOK);
3979 if (vn_getcwd(freepath, &fullpath, &fullpathsize) != 0) {
3980 free(freepath, M_TEMP);
3983 devctl_safe_quote_sb(sb, fullpath);
3984 free(freepath, M_TEMP);
3987 devctl_safe_quote_sb(sb, name);
3988 sbuf_printf(sb, "\"");
3989 if (sbuf_finish(sb) == 0)
3990 devctl_notify("kernel", "signal", "coredump", sbuf_data(sb));
3994 error1 = vn_close(vp, FWRITE, cred, td);
3998 audit_proc_coredump(td, name, error);
4005 * Nonexistent system call-- signal process (may want to handle it). Flag
4006 * error in case process won't see signal immediately (blocked or ignored).
4008 #ifndef _SYS_SYSPROTO_H_
4015 nosys(struct thread *td, struct nosys_args *args)
4022 tdsignal(td, SIGSYS);
4024 if (kern_lognosys == 1 || kern_lognosys == 3) {
4025 uprintf("pid %d comm %s: nosys %d\n", p->p_pid, p->p_comm,
4028 if (kern_lognosys == 2 || kern_lognosys == 3 ||
4029 (p->p_pid == 1 && (kern_lognosys & 3) == 0)) {
4030 printf("pid %d comm %s: nosys %d\n", p->p_pid, p->p_comm,
4037 * Send a SIGIO or SIGURG signal to a process or process group using stored
4038 * credentials rather than those of the current process.
4041 pgsigio(struct sigio **sigiop, int sig, int checkctty)
4044 struct sigio *sigio;
4046 ksiginfo_init(&ksi);
4047 ksi.ksi_signo = sig;
4048 ksi.ksi_code = SI_KERNEL;
4052 if (sigio == NULL) {
4056 if (sigio->sio_pgid > 0) {
4057 PROC_LOCK(sigio->sio_proc);
4058 if (CANSIGIO(sigio->sio_ucred, sigio->sio_proc->p_ucred))
4059 kern_psignal(sigio->sio_proc, sig);
4060 PROC_UNLOCK(sigio->sio_proc);
4061 } else if (sigio->sio_pgid < 0) {
4064 PGRP_LOCK(sigio->sio_pgrp);
4065 LIST_FOREACH(p, &sigio->sio_pgrp->pg_members, p_pglist) {
4067 if (p->p_state == PRS_NORMAL &&
4068 CANSIGIO(sigio->sio_ucred, p->p_ucred) &&
4069 (checkctty == 0 || (p->p_flag & P_CONTROLT)))
4070 kern_psignal(p, sig);
4073 PGRP_UNLOCK(sigio->sio_pgrp);
4079 filt_sigattach(struct knote *kn)
4081 struct proc *p = curproc;
4083 kn->kn_ptr.p_proc = p;
4084 kn->kn_flags |= EV_CLEAR; /* automatically set */
4086 knlist_add(p->p_klist, kn, 0);
4092 filt_sigdetach(struct knote *kn)
4094 struct proc *p = kn->kn_ptr.p_proc;
4096 knlist_remove(p->p_klist, kn, 0);
4100 * signal knotes are shared with proc knotes, so we apply a mask to
4101 * the hint in order to differentiate them from process hints. This
4102 * could be avoided by using a signal-specific knote list, but probably
4103 * isn't worth the trouble.
4106 filt_signal(struct knote *kn, long hint)
4109 if (hint & NOTE_SIGNAL) {
4110 hint &= ~NOTE_SIGNAL;
4112 if (kn->kn_id == hint)
4115 return (kn->kn_data != 0);
4123 ps = malloc(sizeof(struct sigacts), M_SUBPROC, M_WAITOK | M_ZERO);
4124 refcount_init(&ps->ps_refcnt, 1);
4125 mtx_init(&ps->ps_mtx, "sigacts", NULL, MTX_DEF);
4130 sigacts_free(struct sigacts *ps)
4133 if (refcount_release(&ps->ps_refcnt) == 0)
4135 mtx_destroy(&ps->ps_mtx);
4136 free(ps, M_SUBPROC);
4140 sigacts_hold(struct sigacts *ps)
4143 refcount_acquire(&ps->ps_refcnt);
4148 sigacts_copy(struct sigacts *dest, struct sigacts *src)
4151 KASSERT(dest->ps_refcnt == 1, ("sigacts_copy to shared dest"));
4152 mtx_lock(&src->ps_mtx);
4153 bcopy(src, dest, offsetof(struct sigacts, ps_refcnt));
4154 mtx_unlock(&src->ps_mtx);
4158 sigacts_shared(struct sigacts *ps)
4161 return (ps->ps_refcnt > 1);
4165 sig_drop_caught(struct proc *p)
4171 PROC_LOCK_ASSERT(p, MA_OWNED);
4172 mtx_assert(&ps->ps_mtx, MA_OWNED);
4173 SIG_FOREACH(sig, &ps->ps_sigcatch) {
4175 if ((sigprop(sig) & SIGPROP_IGNORE) != 0)
4176 sigqueue_delete_proc(p, sig);
4181 sigfastblock_failed(struct thread *td, bool sendsig, bool write)
4186 * Prevent further fetches and SIGSEGVs, allowing thread to
4187 * issue syscalls despite corruption.
4189 sigfastblock_clear(td);
4193 ksiginfo_init_trap(&ksi);
4194 ksi.ksi_signo = SIGSEGV;
4195 ksi.ksi_code = write ? SEGV_ACCERR : SEGV_MAPERR;
4196 ksi.ksi_addr = td->td_sigblock_ptr;
4197 trapsignal(td, &ksi);
4201 sigfastblock_fetch_sig(struct thread *td, bool sendsig, uint32_t *valp)
4205 if ((td->td_pflags & TDP_SIGFASTBLOCK) == 0)
4207 if (fueword32((void *)td->td_sigblock_ptr, &res) == -1) {
4208 sigfastblock_failed(td, sendsig, false);
4212 td->td_sigblock_val = res & ~SIGFASTBLOCK_FLAGS;
4217 sigfastblock_resched(struct thread *td, bool resched)
4224 reschedule_signals(p, td->td_sigmask, 0);
4228 td->td_flags |= TDF_ASTPENDING | TDF_NEEDSIGCHK;
4233 sys_sigfastblock(struct thread *td, struct sigfastblock_args *uap)
4242 case SIGFASTBLOCK_SETPTR:
4243 if ((td->td_pflags & TDP_SIGFASTBLOCK) != 0) {
4247 if (((uintptr_t)(uap->ptr) & (sizeof(uint32_t) - 1)) != 0) {
4251 td->td_pflags |= TDP_SIGFASTBLOCK;
4252 td->td_sigblock_ptr = uap->ptr;
4255 case SIGFASTBLOCK_UNBLOCK:
4256 if ((td->td_pflags & TDP_SIGFASTBLOCK) == 0) {
4262 res = casueword32(td->td_sigblock_ptr,
4263 SIGFASTBLOCK_PEND, &oldval, 0);
4266 sigfastblock_failed(td, false, true);
4272 if (oldval != SIGFASTBLOCK_PEND) {
4276 error = thread_check_susp(td, false);
4284 * td_sigblock_val is cleared there, but not on a
4285 * syscall exit. The end effect is that a single
4286 * interruptible sleep, while user sigblock word is
4287 * set, might return EINTR or ERESTART to usermode
4288 * without delivering signal. All further sleeps,
4289 * until userspace clears the word and does
4290 * sigfastblock(UNBLOCK), observe current word and no
4291 * longer get interrupted. It is slight
4292 * non-conformance, with alternative to have read the
4293 * sigblock word on each syscall entry.
4295 td->td_sigblock_val = 0;
4298 * Rely on normal ast mechanism to deliver pending
4299 * signals to current thread. But notify others about
4302 sigfastblock_resched(td, error == 0 && p->p_numthreads != 1);
4306 case SIGFASTBLOCK_UNSETPTR:
4307 if ((td->td_pflags & TDP_SIGFASTBLOCK) == 0) {
4311 if (!sigfastblock_fetch_sig(td, false, &oldval)) {
4315 if (oldval != 0 && oldval != SIGFASTBLOCK_PEND) {
4319 sigfastblock_clear(td);
4330 sigfastblock_clear(struct thread *td)
4334 if ((td->td_pflags & TDP_SIGFASTBLOCK) == 0)
4336 td->td_sigblock_val = 0;
4337 resched = (td->td_pflags & TDP_SIGFASTPENDING) != 0 ||
4339 td->td_pflags &= ~(TDP_SIGFASTBLOCK | TDP_SIGFASTPENDING);
4340 sigfastblock_resched(td, resched);
4344 sigfastblock_fetch(struct thread *td)
4348 (void)sigfastblock_fetch_sig(td, true, &val);
4352 sigfastblock_setpend1(struct thread *td)
4357 if ((td->td_pflags & TDP_SIGFASTPENDING) == 0)
4359 res = fueword32((void *)td->td_sigblock_ptr, &oldval);
4361 sigfastblock_failed(td, true, false);
4365 res = casueword32(td->td_sigblock_ptr, oldval, &oldval,
4366 oldval | SIGFASTBLOCK_PEND);
4368 sigfastblock_failed(td, true, true);
4372 td->td_sigblock_val = oldval & ~SIGFASTBLOCK_FLAGS;
4373 td->td_pflags &= ~TDP_SIGFASTPENDING;
4377 if (thread_check_susp(td, false) != 0)
4383 sigfastblock_setpend(struct thread *td, bool resched)
4387 sigfastblock_setpend1(td);
4391 reschedule_signals(p, fastblock_mask, SIGPROCMASK_FASTBLK);