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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7 * Co. or Unix System Laboratories, Inc. and are reproduced herein with
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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_exit.c 8.7 (Berkeley) 2/12/94
37 #include <sys/cdefs.h>
38 __FBSDID("$FreeBSD$");
40 #include "opt_compat.h"
41 #include "opt_kdtrace.h"
42 #include "opt_ktrace.h"
43 #include "opt_procdesc.h"
45 #include <sys/param.h>
46 #include <sys/systm.h>
47 #include <sys/sysproto.h>
48 #include <sys/capability.h>
49 #include <sys/eventhandler.h>
50 #include <sys/kernel.h>
51 #include <sys/malloc.h>
53 #include <sys/mutex.h>
55 #include <sys/procdesc.h>
56 #include <sys/pioctl.h>
60 #include <sys/vmmeter.h>
61 #include <sys/vnode.h>
62 #include <sys/racct.h>
63 #include <sys/resourcevar.h>
65 #include <sys/signalvar.h>
66 #include <sys/sched.h>
68 #include <sys/syscallsubr.h>
69 #include <sys/syslog.h>
70 #include <sys/ptrace.h>
71 #include <sys/acct.h> /* for acct_process() function prototype */
72 #include <sys/filedesc.h>
77 #include <sys/ktrace.h>
80 #include <security/audit/audit.h>
81 #include <security/mac/mac_framework.h>
84 #include <vm/vm_extern.h>
85 #include <vm/vm_param.h>
87 #include <vm/vm_map.h>
88 #include <vm/vm_page.h>
92 #include <sys/dtrace_bsd.h>
93 dtrace_execexit_func_t dtrace_fasttrap_exit;
96 SDT_PROVIDER_DECLARE(proc);
97 SDT_PROBE_DEFINE1(proc, kernel, , exit, "int");
99 /* Hook for NFS teardown procedure. */
100 void (*nlminfo_release_p)(struct proc *p);
103 clear_orphan(struct proc *p)
106 PROC_LOCK_ASSERT(p, MA_OWNED);
108 if (p->p_flag & P_ORPHAN) {
109 LIST_REMOVE(p, p_orphan);
110 p->p_flag &= ~P_ORPHAN;
115 * exit -- death of process.
118 sys_sys_exit(struct thread *td, struct sys_exit_args *uap)
121 exit1(td, W_EXITCODE(uap->rval, 0));
126 * Exit: deallocate address space and other resources, change proc state to
127 * zombie, and unlink proc from allproc and parent's lists. Save exit status
128 * and rusage for wait(). Check for child processes and orphan them.
131 exit1(struct thread *td, int rv)
133 struct proc *p, *nq, *q;
134 struct vnode *ttyvp = NULL;
136 mtx_assert(&Giant, MA_NOTOWNED);
140 * XXX in case we're rebooting we just let init die in order to
141 * work around an unsolved stack overflow seen very late during
142 * shutdown on sparc64 when the gmirror worker process exists.
144 if (p == initproc && rebooting == 0) {
145 printf("init died (signal %d, exit %d)\n",
146 WTERMSIG(rv), WEXITSTATUS(rv));
147 panic("Going nowhere without my init!");
151 * MUST abort all other threads before proceeding past here.
154 while (p->p_flag & P_HADTHREADS) {
156 * First check if some other thread got here before us.
157 * If so, act appropriately: exit or suspend.
159 thread_suspend_check(0);
162 * Kill off the other threads. This requires
163 * some co-operation from other parts of the kernel
164 * so it may not be instantaneous. With this state set
165 * any thread entering the kernel from userspace will
166 * thread_exit() in trap(). Any thread attempting to
167 * sleep will return immediately with EINTR or EWOULDBLOCK
168 * which will hopefully force them to back out to userland
169 * freeing resources as they go. Any thread attempting
170 * to return to userland will thread_exit() from userret().
171 * thread_exit() will unsuspend us when the last of the
172 * other threads exits.
173 * If there is already a thread singler after resumption,
174 * calling thread_single will fail; in that case, we just
175 * re-check all suspension request, the thread should
176 * either be suspended there or exit.
178 if (!thread_single(SINGLE_EXIT))
182 * All other activity in this process is now stopped.
183 * Threading support has been turned off.
186 KASSERT(p->p_numthreads == 1,
187 ("exit1: proc %p exiting with %d threads", p, p->p_numthreads));
188 racct_sub(p, RACCT_NTHR, 1);
190 * Wakeup anyone in procfs' PIOCWAIT. They should have a hold
191 * on our vmspace, so we should block below until they have
192 * released their reference to us. Note that if they have
193 * requested S_EXIT stops we will block here until they ack
196 _STOPEVENT(p, S_EXIT, rv);
199 * Ignore any pending request to stop due to a stop signal.
200 * Once P_WEXIT is set, future requests will be ignored as
203 p->p_flag &= ~P_STOPPED_SIG;
204 KASSERT(!P_SHOULDSTOP(p), ("exiting process is stopped"));
207 * Note that we are exiting and do another wakeup of anyone in
208 * PIOCWAIT in case they aren't listening for S_EXIT stops or
209 * decided to wait again after we told them we are exiting.
211 p->p_flag |= P_WEXIT;
215 * Wait for any processes that have a hold on our vmspace to
216 * release their reference.
218 while (p->p_lock > 0)
219 msleep(&p->p_lock, &p->p_mtx, PWAIT, "exithold", 0);
221 p->p_xstat = rv; /* Let event handler change exit status */
223 /* Drain the limit callout while we don't have the proc locked */
224 callout_drain(&p->p_limco);
228 * The Sun BSM exit token contains two components: an exit status as
229 * passed to exit(), and a return value to indicate what sort of exit
230 * it was. The exit status is WEXITSTATUS(rv), but it's not clear
231 * what the return value is.
233 AUDIT_ARG_EXIT(WEXITSTATUS(rv), 0);
234 AUDIT_SYSCALL_EXIT(0, td);
237 /* Are we a task leader? */
238 if (p == p->p_leader) {
239 mtx_lock(&ppeers_lock);
243 kern_psignal(q, SIGKILL);
247 while (p->p_peers != NULL)
248 msleep(p, &ppeers_lock, PWAIT, "exit1", 0);
249 mtx_unlock(&ppeers_lock);
253 * Check if any loadable modules need anything done at process exit.
254 * E.g. SYSV IPC stuff
255 * XXX what if one of these generates an error?
257 EVENTHANDLER_INVOKE(process_exit, p);
260 * If parent is waiting for us to exit or exec,
261 * P_PPWAIT is set; we will wakeup the parent below.
264 rv = p->p_xstat; /* Event handler could change exit status */
266 p->p_flag &= ~(P_TRACED | P_PPWAIT | P_PPTRACE);
269 * Stop the real interval timer. If the handler is currently
270 * executing, prevent it from rearming itself and let it finish.
272 if (timevalisset(&p->p_realtimer.it_value) &&
273 callout_stop(&p->p_itcallout) == 0) {
274 timevalclear(&p->p_realtimer.it_interval);
275 msleep(&p->p_itcallout, &p->p_mtx, PWAIT, "ritwait", 0);
276 KASSERT(!timevalisset(&p->p_realtimer.it_value),
277 ("realtime timer is still armed"));
282 * Reset any sigio structures pointing to us as a result of
283 * F_SETOWN with our pid.
285 funsetownlst(&p->p_sigiolst);
288 * If this process has an nlminfo data area (for lockd), release it
290 if (nlminfo_release_p != NULL && p->p_nlminfo != NULL)
291 (*nlminfo_release_p)(p);
294 * Close open files and release open-file table.
300 * If this thread tickled GEOM, we need to wait for the giggling to
301 * stop before we return to userland
303 if (td->td_pflags & TDP_GEOM)
307 * Remove ourself from our leader's peer list and wake our leader.
309 mtx_lock(&ppeers_lock);
310 if (p->p_leader->p_peers) {
312 while (q->p_peers != p)
314 q->p_peers = p->p_peers;
317 mtx_unlock(&ppeers_lock);
321 sx_xlock(&proctree_lock);
322 if (SESS_LEADER(p)) {
323 struct session *sp = p->p_session;
327 * s_ttyp is not zero'd; we use this to indicate that
328 * the session once had a controlling terminal. (for
329 * logging and informational purposes)
340 * Signal foreground pgrp and revoke access to
341 * controlling terminal if it has not been revoked
344 * Because the TTY may have been revoked in the mean
345 * time and could already have a new session associated
346 * with it, make sure we don't send a SIGHUP to a
347 * foreground process group that does not belong to this
353 if (tp->t_session == sp)
354 tty_signal_pgrp(tp, SIGHUP);
359 sx_xunlock(&proctree_lock);
360 if (vn_lock(ttyvp, LK_EXCLUSIVE) == 0) {
361 VOP_REVOKE(ttyvp, REVOKEALL);
362 VOP_UNLOCK(ttyvp, 0);
364 sx_xlock(&proctree_lock);
367 fixjobc(p, p->p_pgrp, 0);
368 sx_xunlock(&proctree_lock);
369 (void)acct_process(td);
371 /* Release the TTY now we've unlocked everything. */
378 * Release reference to text vnode
380 if (p->p_textvp != NULL) {
386 * Release our limits structure.
388 lim_free(p->p_limit);
394 * Remove proc from allproc queue and pidhash chain.
395 * Place onto zombproc. Unlink from parent's child list.
397 sx_xlock(&allproc_lock);
398 LIST_REMOVE(p, p_list);
399 LIST_INSERT_HEAD(&zombproc, p, p_list);
400 LIST_REMOVE(p, p_hash);
401 sx_xunlock(&allproc_lock);
404 * Call machine-dependent code to release any
405 * machine-dependent resources other than the address space.
406 * The address space is released by "vmspace_exitfree(p)" in
411 WITNESS_WARN(WARN_PANIC, NULL, "process (pid %d) exiting", p->p_pid);
414 * Reparent all of our children to init.
416 sx_xlock(&proctree_lock);
417 q = LIST_FIRST(&p->p_children);
418 if (q != NULL) /* only need this if any child is S_ZOMB */
420 for (; q != NULL; q = nq) {
421 nq = LIST_NEXT(q, p_sibling);
423 proc_reparent(q, initproc);
424 q->p_sigparent = SIGCHLD;
426 * Traced processes are killed
427 * since their existence means someone is screwing up.
429 if (q->p_flag & P_TRACED) {
433 * Since q was found on our children list, the
434 * proc_reparent() call moved q to the orphan
435 * list due to present P_TRACED flag. Clear
436 * orphan link for q now while q is locked.
439 q->p_flag &= ~(P_TRACED | P_STOPPED_TRACE);
440 FOREACH_THREAD_IN_PROC(q, temp)
441 temp->td_dbgflags &= ~TDB_SUSPEND;
442 kern_psignal(q, SIGKILL);
448 * Also get rid of our orphans.
450 while ((q = LIST_FIRST(&p->p_orphans)) != NULL) {
456 /* Save exit status. */
460 /* Tell the prison that we are gone. */
461 prison_proc_free(p->p_ucred->cr_prison);
465 * Tell the DTrace fasttrap provider about the exit if it
466 * has declared an interest.
468 if (dtrace_fasttrap_exit)
469 dtrace_fasttrap_exit(p);
473 * Notify interested parties of our demise.
475 KNOTE_LOCKED(&p->p_klist, NOTE_EXIT);
478 int reason = CLD_EXITED;
481 else if (WIFSIGNALED(rv))
483 SDT_PROBE(proc, kernel, , exit, reason, 0, 0, 0, 0);
487 * Just delete all entries in the p_klist. At this point we won't
488 * report any more events, and there are nasty race conditions that
489 * can beat us if we don't.
491 knlist_clear(&p->p_klist, 1);
494 * If this is a process with a descriptor, we may not need to deliver
495 * a signal to the parent. proctree_lock is held over
496 * procdesc_exit() to serialize concurrent calls to close() and
500 if (p->p_procdesc == NULL || procdesc_exit(p)) {
503 * Notify parent that we're gone. If parent has the
504 * PS_NOCLDWAIT flag set, or if the handler is set to SIG_IGN,
505 * notify process 1 instead (and hope it will handle this
508 PROC_LOCK(p->p_pptr);
509 mtx_lock(&p->p_pptr->p_sigacts->ps_mtx);
510 if (p->p_pptr->p_sigacts->ps_flag &
511 (PS_NOCLDWAIT | PS_CLDSIGIGN)) {
514 mtx_unlock(&p->p_pptr->p_sigacts->ps_mtx);
517 proc_reparent(p, initproc);
518 p->p_sigparent = SIGCHLD;
519 PROC_LOCK(p->p_pptr);
522 * Notify parent, so in case he was wait(2)ing or
523 * executing waitpid(2) with our pid, he will
528 mtx_unlock(&p->p_pptr->p_sigacts->ps_mtx);
530 if (p->p_pptr == initproc)
531 kern_psignal(p->p_pptr, SIGCHLD);
532 else if (p->p_sigparent != 0) {
533 if (p->p_sigparent == SIGCHLD)
535 else /* LINUX thread */
536 kern_psignal(p->p_pptr, p->p_sigparent);
540 PROC_LOCK(p->p_pptr);
542 sx_xunlock(&proctree_lock);
545 * The state PRS_ZOMBIE prevents other proesses from sending
546 * signal to the process, to avoid memory leak, we free memory
547 * for signal queue at the time when the state is set.
549 sigqueue_flush(&p->p_sigqueue);
550 sigqueue_flush(&td->td_sigqueue);
553 * We have to wait until after acquiring all locks before
554 * changing p_state. We need to avoid all possible context
555 * switches (including ones from blocking on a mutex) while
556 * marked as a zombie. We also have to set the zombie state
557 * before we release the parent process' proc lock to avoid
558 * a lost wakeup. So, we first call wakeup, then we grab the
559 * sched lock, update the state, and release the parent process'
563 cv_broadcast(&p->p_pwait);
564 sched_exit(p->p_pptr, td);
566 p->p_state = PRS_ZOMBIE;
567 PROC_UNLOCK(p->p_pptr);
570 * Hopefully no one will try to deliver a signal to the process this
573 knlist_destroy(&p->p_klist);
576 * Save our children's rusage information in our exit rusage.
578 ruadd(&p->p_ru, &p->p_rux, &p->p_stats->p_cru, &p->p_crux);
581 * Make sure the scheduler takes this thread out of its tables etc.
582 * This will also release this thread's reference to the ucred.
583 * Other thread parts to release include pcb bits and such.
589 #ifndef _SYS_SYSPROTO_H_
598 sys_abort2(struct thread *td, struct abort2_args *uap)
600 struct proc *p = td->td_proc;
606 * Do it right now so we can log either proper call of abort2(), or
607 * note, that invalid argument was passed. 512 is big enough to
608 * handle 16 arguments' descriptions with additional comments.
610 sb = sbuf_new(NULL, NULL, 512, SBUF_FIXEDLEN);
612 sbuf_printf(sb, "%s(pid %d uid %d) aborted: ",
613 p->p_comm, p->p_pid, td->td_ucred->cr_uid);
615 * Since we can't return from abort2(), send SIGKILL in cases, where
616 * abort2() was called improperly
619 /* Prevent from DoSes from user-space. */
620 if (uap->nargs < 0 || uap->nargs > 16)
622 if (uap->nargs > 0) {
623 if (uap->args == NULL)
625 error = copyin(uap->args, uargs, uap->nargs * sizeof(void *));
630 * Limit size of 'reason' string to 128. Will fit even when
631 * maximal number of arguments was chosen to be logged.
633 if (uap->why != NULL) {
634 error = sbuf_copyin(sb, uap->why, 128);
638 sbuf_printf(sb, "(null)");
640 if (uap->nargs > 0) {
641 sbuf_printf(sb, "(");
642 for (i = 0;i < uap->nargs; i++)
643 sbuf_printf(sb, "%s%p", i == 0 ? "" : ", ", uargs[i]);
644 sbuf_printf(sb, ")");
647 * Final stage: arguments were proper, string has been
648 * successfully copied from userspace, and copying pointers
649 * from user-space succeed.
653 if (sig == SIGKILL) {
655 sbuf_printf(sb, " (Reason text inaccessible)");
659 log(LOG_INFO, "%s", sbuf_data(sb));
661 exit1(td, W_EXITCODE(0, sig));
668 * The dirty work is handled by kern_wait().
671 owait(struct thread *td, struct owait_args *uap __unused)
675 error = kern_wait(td, WAIT_ANY, &status, 0, NULL);
677 td->td_retval[1] = status;
680 #endif /* COMPAT_43 */
683 * The dirty work is handled by kern_wait().
686 sys_wait4(struct thread *td, struct wait4_args *uap)
688 struct rusage ru, *rup;
691 if (uap->rusage != NULL)
695 error = kern_wait(td, uap->pid, &status, uap->options, rup);
696 if (uap->status != NULL && error == 0)
697 error = copyout(&status, uap->status, sizeof(status));
698 if (uap->rusage != NULL && error == 0)
699 error = copyout(&ru, uap->rusage, sizeof(struct rusage));
704 sys_wait6(struct thread *td, struct wait6_args *uap)
706 struct __wrusage wru, *wrup;
712 idtype = uap->idtype;
715 if (uap->wrusage != NULL)
720 if (uap->info != NULL) {
722 bzero(sip, sizeof(*sip));
727 * We expect all callers of wait6() to know about WEXITED and
730 error = kern_wait6(td, idtype, id, &status, uap->options, wrup, sip);
732 if (uap->status != NULL && error == 0)
733 error = copyout(&status, uap->status, sizeof(status));
734 if (uap->wrusage != NULL && error == 0)
735 error = copyout(&wru, uap->wrusage, sizeof(wru));
736 if (uap->info != NULL && error == 0)
737 error = copyout(&si, uap->info, sizeof(si));
742 * Reap the remains of a zombie process and optionally return status and
743 * rusage. Asserts and will release both the proctree_lock and the process
744 * lock as part of its work.
747 proc_reap(struct thread *td, struct proc *p, int *status, int options)
751 sx_assert(&proctree_lock, SA_XLOCKED);
752 PROC_LOCK_ASSERT(p, MA_OWNED);
753 PROC_SLOCK_ASSERT(p, MA_OWNED);
754 KASSERT(p->p_state == PRS_ZOMBIE, ("proc_reap: !PRS_ZOMBIE"));
759 td->td_retval[0] = p->p_pid;
761 *status = p->p_xstat; /* convert to int */
762 if (options & WNOWAIT) {
764 * Only poll, returning the status. Caller does not wish to
765 * release the proc struct just yet.
768 sx_xunlock(&proctree_lock);
773 sigqueue_take(p->p_ksi);
778 * If we got the child via a ptrace 'attach', we need to give it back
781 if (p->p_oppid && (t = pfind(p->p_oppid)) != NULL) {
786 pksignal(t, SIGCHLD, p->p_ksi);
788 cv_broadcast(&p->p_pwait);
790 sx_xunlock(&proctree_lock);
795 * Remove other references to this process to ensure we have an
796 * exclusive reference.
798 sx_xlock(&allproc_lock);
799 LIST_REMOVE(p, p_list); /* off zombproc */
800 sx_xunlock(&allproc_lock);
801 LIST_REMOVE(p, p_sibling);
807 if (p->p_procdesc != NULL)
810 sx_xunlock(&proctree_lock);
813 * As a side effect of this lock, we know that all other writes to
814 * this proc are visible now, so no more locking is needed for p.
817 p->p_xstat = 0; /* XXX: why? */
820 ruadd(&q->p_stats->p_cru, &q->p_crux, &p->p_ru, &p->p_rux);
824 * Decrement the count of procs running with this uid.
826 (void)chgproccnt(p->p_ucred->cr_ruidinfo, -1, 0);
829 * Destroy resource accounting information associated with the process.
833 racct_sub(p, RACCT_NPROC, 1);
839 * Free credentials, arguments, and sigacts.
843 pargs_drop(p->p_args);
845 sigacts_free(p->p_sigacts);
849 * Do any thread-system specific cleanups.
854 * Give vm and machine-dependent layer a chance to free anything that
855 * cpu_exit couldn't release while still running in process context.
861 KASSERT(FIRST_THREAD_IN_PROC(p),
862 ("proc_reap: no residual thread!"));
863 uma_zfree(proc_zone, p);
864 sx_xlock(&allproc_lock);
866 sx_xunlock(&allproc_lock);
870 proc_to_reap(struct thread *td, struct proc *p, idtype_t idtype, id_t id,
871 int *status, int options, struct __wrusage *wrusage, siginfo_t *siginfo)
876 sx_assert(&proctree_lock, SA_XLOCKED);
885 if (p->p_pid != (pid_t)id) {
891 if (p->p_pgid != (pid_t)id) {
897 if (p->p_session->s_sid != (pid_t)id) {
903 if (p->p_ucred->cr_uid != (uid_t)id) {
909 if (p->p_ucred->cr_gid != (gid_t)id) {
915 if (p->p_ucred->cr_prison->pr_id != (int)id) {
921 * It seems that the thread structures get zeroed out
922 * at process exit. This makes it impossible to
923 * support P_SETID, P_CID or P_CPUID.
930 if (p_canwait(td, p)) {
935 if (((options & WEXITED) == 0) && (p->p_state == PRS_ZOMBIE)) {
941 * This special case handles a kthread spawned by linux_clone
942 * (see linux_misc.c). The linux_wait4 and linux_waitpid
943 * functions need to be able to distinguish between waiting
944 * on a process and waiting on a thread. It is a thread if
945 * p_sigparent is not SIGCHLD, and the WLINUXCLONE option
946 * signifies we want to wait for threads and not processes.
948 if ((p->p_sigparent != SIGCHLD) ^
949 ((options & WLINUXCLONE) != 0)) {
956 if (siginfo != NULL) {
957 bzero(siginfo, sizeof(*siginfo));
958 siginfo->si_errno = 0;
961 * SUSv4 requires that the si_signo value is always
962 * SIGCHLD. Obey it despite the rfork(2) interface
963 * allows to request other signal for child exit
966 siginfo->si_signo = SIGCHLD;
969 * This is still a rough estimate. We will fix the
970 * cases TRAPPED, STOPPED, and CONTINUED later.
972 if (WCOREDUMP(p->p_xstat)) {
973 siginfo->si_code = CLD_DUMPED;
974 siginfo->si_status = WTERMSIG(p->p_xstat);
975 } else if (WIFSIGNALED(p->p_xstat)) {
976 siginfo->si_code = CLD_KILLED;
977 siginfo->si_status = WTERMSIG(p->p_xstat);
979 siginfo->si_code = CLD_EXITED;
980 siginfo->si_status = WEXITSTATUS(p->p_xstat);
983 siginfo->si_pid = p->p_pid;
984 siginfo->si_uid = p->p_ucred->cr_uid;
987 * The si_addr field would be useful additional
988 * detail, but apparently the PC value may be lost
989 * when we reach this point. bzero() above sets
990 * siginfo->si_addr to NULL.
995 * There should be no reason to limit resources usage info to
996 * exited processes only. A snapshot about any resources used
997 * by a stopped process may be exactly what is needed.
999 if (wrusage != NULL) {
1000 rup = &wrusage->wru_self;
1002 calcru(p, &rup->ru_utime, &rup->ru_stime);
1004 rup = &wrusage->wru_children;
1005 *rup = p->p_stats->p_cru;
1006 calccru(p, &rup->ru_utime, &rup->ru_stime);
1009 if (p->p_state == PRS_ZOMBIE) {
1010 proc_reap(td, p, status, options);
1019 kern_wait(struct thread *td, pid_t pid, int *status, int options,
1020 struct rusage *rusage)
1022 struct __wrusage wru, *wrup;
1028 * Translate the special pid values into the (idtype, pid)
1029 * pair for kern_wait6. The WAIT_MYPGRP case is handled by
1030 * kern_wait6() on its own.
1032 if (pid == WAIT_ANY) {
1035 } else if (pid < 0) {
1049 * For backward compatibility we implicitly add flags WEXITED
1050 * and WTRAPPED here.
1052 options |= WEXITED | WTRAPPED;
1053 ret = kern_wait6(td, idtype, id, status, options, wrup, NULL);
1055 *rusage = wru.wru_self;
1060 kern_wait6(struct thread *td, idtype_t idtype, id_t id, int *status,
1061 int options, struct __wrusage *wrusage, siginfo_t *siginfo)
1064 int error, nfound, ret;
1066 AUDIT_ARG_VALUE((int)idtype); /* XXX - This is likely wrong! */
1067 AUDIT_ARG_PID((pid_t)id); /* XXX - This may be wrong! */
1068 AUDIT_ARG_VALUE(options);
1072 if ((pid_t)id == WAIT_MYPGRP && (idtype == P_PID || idtype == P_PGID)) {
1074 id = (id_t)q->p_pgid;
1079 /* If we don't know the option, just return. */
1080 if ((options & ~(WUNTRACED | WNOHANG | WCONTINUED | WNOWAIT |
1081 WEXITED | WTRAPPED | WLINUXCLONE)) != 0)
1083 if ((options & (WEXITED | WUNTRACED | WCONTINUED | WTRAPPED)) == 0) {
1085 * We will be unable to find any matching processes,
1086 * because there are no known events to look for.
1087 * Prefer to return error instead of blocking
1094 if (q->p_flag & P_STATCHILD) {
1096 q->p_flag &= ~P_STATCHILD;
1100 sx_xlock(&proctree_lock);
1101 LIST_FOREACH(p, &q->p_children, p_sibling) {
1102 ret = proc_to_reap(td, p, idtype, id, status, options,
1114 if ((options & WTRAPPED) != 0 &&
1115 (p->p_flag & P_TRACED) != 0 &&
1116 (p->p_flag & (P_STOPPED_TRACE | P_STOPPED_SIG)) != 0 &&
1117 (p->p_suspcount == p->p_numthreads) &&
1118 ((p->p_flag & P_WAITED) == 0)) {
1120 if ((options & WNOWAIT) == 0)
1121 p->p_flag |= P_WAITED;
1122 sx_xunlock(&proctree_lock);
1123 td->td_retval[0] = p->p_pid;
1126 *status = W_STOPCODE(p->p_xstat);
1127 if (siginfo != NULL) {
1128 siginfo->si_status = p->p_xstat;
1129 siginfo->si_code = CLD_TRAPPED;
1131 if ((options & WNOWAIT) == 0) {
1133 sigqueue_take(p->p_ksi);
1140 if ((options & WUNTRACED) != 0 &&
1141 (p->p_flag & P_STOPPED_SIG) != 0 &&
1142 (p->p_suspcount == p->p_numthreads) &&
1143 ((p->p_flag & P_WAITED) == 0)) {
1145 if ((options & WNOWAIT) == 0)
1146 p->p_flag |= P_WAITED;
1147 sx_xunlock(&proctree_lock);
1148 td->td_retval[0] = p->p_pid;
1151 *status = W_STOPCODE(p->p_xstat);
1152 if (siginfo != NULL) {
1153 siginfo->si_status = p->p_xstat;
1154 siginfo->si_code = CLD_STOPPED;
1156 if ((options & WNOWAIT) == 0) {
1158 sigqueue_take(p->p_ksi);
1166 if ((options & WCONTINUED) != 0 &&
1167 (p->p_flag & P_CONTINUED) != 0) {
1168 sx_xunlock(&proctree_lock);
1169 td->td_retval[0] = p->p_pid;
1170 if ((options & WNOWAIT) == 0) {
1171 p->p_flag &= ~P_CONTINUED;
1173 sigqueue_take(p->p_ksi);
1180 if (siginfo != NULL) {
1181 siginfo->si_status = SIGCONT;
1182 siginfo->si_code = CLD_CONTINUED;
1190 * Look in the orphans list too, to allow the parent to
1191 * collect it's child exit status even if child is being
1194 * Debugger detaches from the parent upon successful
1195 * switch-over from parent to child. At this point due to
1196 * re-parenting the parent loses the child to debugger and a
1197 * wait4(2) call would report that it has no children to wait
1198 * for. By maintaining a list of orphans we allow the parent
1199 * to successfully wait until the child becomes a zombie.
1201 LIST_FOREACH(p, &q->p_orphans, p_orphan) {
1202 ret = proc_to_reap(td, p, idtype, id, status, options,
1212 sx_xunlock(&proctree_lock);
1215 if (options & WNOHANG) {
1216 sx_xunlock(&proctree_lock);
1217 td->td_retval[0] = 0;
1221 sx_xunlock(&proctree_lock);
1222 if (q->p_flag & P_STATCHILD) {
1223 q->p_flag &= ~P_STATCHILD;
1226 error = msleep(q, &q->p_mtx, PWAIT | PCATCH, "wait", 0);
1234 * Make process 'parent' the new parent of process 'child'.
1235 * Must be called with an exclusive hold of proctree lock.
1238 proc_reparent(struct proc *child, struct proc *parent)
1241 sx_assert(&proctree_lock, SX_XLOCKED);
1242 PROC_LOCK_ASSERT(child, MA_OWNED);
1243 if (child->p_pptr == parent)
1246 PROC_LOCK(child->p_pptr);
1247 sigqueue_take(child->p_ksi);
1248 PROC_UNLOCK(child->p_pptr);
1249 LIST_REMOVE(child, p_sibling);
1250 LIST_INSERT_HEAD(&parent->p_children, child, p_sibling);
1252 clear_orphan(child);
1253 if (child->p_flag & P_TRACED) {
1254 LIST_INSERT_HEAD(&child->p_pptr->p_orphans, child, p_orphan);
1255 child->p_flag |= P_ORPHAN;
1258 child->p_pptr = parent;