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
8 * the permission of UNIX System Laboratories, Inc.
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11 * modification, are permitted provided that the following conditions
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
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19 * may be used to endorse or promote products derived from this software
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22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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25 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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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, 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;
135 struct vnode *ttyvp = NULL;
138 mtx_assert(&Giant, MA_NOTOWNED);
142 * XXX in case we're rebooting we just let init die in order to
143 * work around an unsolved stack overflow seen very late during
144 * shutdown on sparc64 when the gmirror worker process exists.
146 if (p == initproc && rebooting == 0) {
147 printf("init died (signal %d, exit %d)\n",
148 WTERMSIG(rv), WEXITSTATUS(rv));
149 panic("Going nowhere without my init!");
153 * MUST abort all other threads before proceeding past here.
156 while (p->p_flag & P_HADTHREADS) {
158 * First check if some other thread got here before us.
159 * If so, act appropriately: exit or suspend.
161 thread_suspend_check(0);
164 * Kill off the other threads. This requires
165 * some co-operation from other parts of the kernel
166 * so it may not be instantaneous. With this state set
167 * any thread entering the kernel from userspace will
168 * thread_exit() in trap(). Any thread attempting to
169 * sleep will return immediately with EINTR or EWOULDBLOCK
170 * which will hopefully force them to back out to userland
171 * freeing resources as they go. Any thread attempting
172 * to return to userland will thread_exit() from userret().
173 * thread_exit() will unsuspend us when the last of the
174 * other threads exits.
175 * If there is already a thread singler after resumption,
176 * calling thread_single will fail; in that case, we just
177 * re-check all suspension request, the thread should
178 * either be suspended there or exit.
180 if (!thread_single(SINGLE_EXIT))
184 * All other activity in this process is now stopped.
185 * Threading support has been turned off.
188 KASSERT(p->p_numthreads == 1,
189 ("exit1: proc %p exiting with %d threads", p, p->p_numthreads));
190 racct_sub(p, RACCT_NTHR, 1);
192 * Wakeup anyone in procfs' PIOCWAIT. They should have a hold
193 * on our vmspace, so we should block below until they have
194 * released their reference to us. Note that if they have
195 * requested S_EXIT stops we will block here until they ack
198 _STOPEVENT(p, S_EXIT, rv);
201 * Ignore any pending request to stop due to a stop signal.
202 * Once P_WEXIT is set, future requests will be ignored as
205 p->p_flag &= ~P_STOPPED_SIG;
206 KASSERT(!P_SHOULDSTOP(p), ("exiting process is stopped"));
209 * Note that we are exiting and do another wakeup of anyone in
210 * PIOCWAIT in case they aren't listening for S_EXIT stops or
211 * decided to wait again after we told them we are exiting.
213 p->p_flag |= P_WEXIT;
217 * Wait for any processes that have a hold on our vmspace to
218 * release their reference.
220 while (p->p_lock > 0)
221 msleep(&p->p_lock, &p->p_mtx, PWAIT, "exithold", 0);
223 p->p_xstat = rv; /* Let event handler change exit status */
225 /* Drain the limit callout while we don't have the proc locked */
226 callout_drain(&p->p_limco);
230 * The Sun BSM exit token contains two components: an exit status as
231 * passed to exit(), and a return value to indicate what sort of exit
232 * it was. The exit status is WEXITSTATUS(rv), but it's not clear
233 * what the return value is.
235 AUDIT_ARG_EXIT(WEXITSTATUS(rv), 0);
236 AUDIT_SYSCALL_EXIT(0, td);
239 /* Are we a task leader? */
240 if (p == p->p_leader) {
241 mtx_lock(&ppeers_lock);
245 kern_psignal(q, SIGKILL);
249 while (p->p_peers != NULL)
250 msleep(p, &ppeers_lock, PWAIT, "exit1", 0);
251 mtx_unlock(&ppeers_lock);
255 * Check if any loadable modules need anything done at process exit.
256 * E.g. SYSV IPC stuff
257 * XXX what if one of these generates an error?
259 EVENTHANDLER_INVOKE(process_exit, p);
262 * If parent is waiting for us to exit or exec,
263 * P_PPWAIT is set; we will wakeup the parent below.
266 rv = p->p_xstat; /* Event handler could change exit status */
268 p->p_flag &= ~(P_TRACED | P_PPWAIT | P_PPTRACE);
271 * Stop the real interval timer. If the handler is currently
272 * executing, prevent it from rearming itself and let it finish.
274 if (timevalisset(&p->p_realtimer.it_value) &&
275 callout_stop(&p->p_itcallout) == 0) {
276 timevalclear(&p->p_realtimer.it_interval);
277 msleep(&p->p_itcallout, &p->p_mtx, PWAIT, "ritwait", 0);
278 KASSERT(!timevalisset(&p->p_realtimer.it_value),
279 ("realtime timer is still armed"));
284 * Reset any sigio structures pointing to us as a result of
285 * F_SETOWN with our pid.
287 funsetownlst(&p->p_sigiolst);
290 * If this process has an nlminfo data area (for lockd), release it
292 if (nlminfo_release_p != NULL && p->p_nlminfo != NULL)
293 (*nlminfo_release_p)(p);
296 * Close open files and release open-file table.
302 * If this thread tickled GEOM, we need to wait for the giggling to
303 * stop before we return to userland
305 if (td->td_pflags & TDP_GEOM)
309 * Remove ourself from our leader's peer list and wake our leader.
311 mtx_lock(&ppeers_lock);
312 if (p->p_leader->p_peers) {
314 while (q->p_peers != p)
316 q->p_peers = p->p_peers;
319 mtx_unlock(&ppeers_lock);
323 sx_xlock(&proctree_lock);
324 if (SESS_LEADER(p)) {
325 struct session *sp = p->p_session;
329 * s_ttyp is not zero'd; we use this to indicate that
330 * the session once had a controlling terminal. (for
331 * logging and informational purposes)
342 * Signal foreground pgrp and revoke access to
343 * controlling terminal if it has not been revoked
346 * Because the TTY may have been revoked in the mean
347 * time and could already have a new session associated
348 * with it, make sure we don't send a SIGHUP to a
349 * foreground process group that does not belong to this
355 if (tp->t_session == sp)
356 tty_signal_pgrp(tp, SIGHUP);
361 sx_xunlock(&proctree_lock);
362 if (vn_lock(ttyvp, LK_EXCLUSIVE) == 0) {
363 VOP_REVOKE(ttyvp, REVOKEALL);
364 VOP_UNLOCK(ttyvp, 0);
366 sx_xlock(&proctree_lock);
369 fixjobc(p, p->p_pgrp, 0);
370 sx_xunlock(&proctree_lock);
371 (void)acct_process(td);
373 /* Release the TTY now we've unlocked everything. */
380 * Release reference to text vnode
382 if ((vtmp = p->p_textvp) != NULL) {
388 * Release our limits structure.
399 * Remove proc from allproc queue and pidhash chain.
400 * Place onto zombproc. Unlink from parent's child list.
402 sx_xlock(&allproc_lock);
403 LIST_REMOVE(p, p_list);
404 LIST_INSERT_HEAD(&zombproc, p, p_list);
405 LIST_REMOVE(p, p_hash);
406 sx_xunlock(&allproc_lock);
409 * Call machine-dependent code to release any
410 * machine-dependent resources other than the address space.
411 * The address space is released by "vmspace_exitfree(p)" in
416 WITNESS_WARN(WARN_PANIC, NULL, "process (pid %d) exiting", p->p_pid);
419 * Reparent all of our children to init.
421 sx_xlock(&proctree_lock);
422 q = LIST_FIRST(&p->p_children);
423 if (q != NULL) /* only need this if any child is S_ZOMB */
425 for (; q != NULL; q = nq) {
426 nq = LIST_NEXT(q, p_sibling);
428 proc_reparent(q, initproc);
429 q->p_sigparent = SIGCHLD;
431 * Traced processes are killed
432 * since their existence means someone is screwing up.
434 if (q->p_flag & P_TRACED) {
438 * Since q was found on our children list, the
439 * proc_reparent() call moved q to the orphan
440 * list due to present P_TRACED flag. Clear
441 * orphan link for q now while q is locked.
444 q->p_flag &= ~(P_TRACED | P_STOPPED_TRACE);
445 FOREACH_THREAD_IN_PROC(q, temp)
446 temp->td_dbgflags &= ~TDB_SUSPEND;
447 kern_psignal(q, SIGKILL);
453 * Also get rid of our orphans.
455 while ((q = LIST_FIRST(&p->p_orphans)) != NULL) {
461 /* Save exit status. */
465 /* Tell the prison that we are gone. */
466 prison_proc_free(p->p_ucred->cr_prison);
470 * Tell the DTrace fasttrap provider about the exit if it
471 * has declared an interest.
473 if (dtrace_fasttrap_exit)
474 dtrace_fasttrap_exit(p);
478 * Notify interested parties of our demise.
480 KNOTE_LOCKED(&p->p_klist, NOTE_EXIT);
483 int reason = CLD_EXITED;
486 else if (WIFSIGNALED(rv))
488 SDT_PROBE(proc, kernel, , exit, reason, 0, 0, 0, 0);
492 * Just delete all entries in the p_klist. At this point we won't
493 * report any more events, and there are nasty race conditions that
494 * can beat us if we don't.
496 knlist_clear(&p->p_klist, 1);
499 * If this is a process with a descriptor, we may not need to deliver
500 * a signal to the parent. proctree_lock is held over
501 * procdesc_exit() to serialize concurrent calls to close() and
505 if (p->p_procdesc == NULL || procdesc_exit(p)) {
508 * Notify parent that we're gone. If parent has the
509 * PS_NOCLDWAIT flag set, or if the handler is set to SIG_IGN,
510 * notify process 1 instead (and hope it will handle this
513 PROC_LOCK(p->p_pptr);
514 mtx_lock(&p->p_pptr->p_sigacts->ps_mtx);
515 if (p->p_pptr->p_sigacts->ps_flag &
516 (PS_NOCLDWAIT | PS_CLDSIGIGN)) {
519 mtx_unlock(&p->p_pptr->p_sigacts->ps_mtx);
522 proc_reparent(p, initproc);
523 p->p_sigparent = SIGCHLD;
524 PROC_LOCK(p->p_pptr);
527 * Notify parent, so in case he was wait(2)ing or
528 * executing waitpid(2) with our pid, he will
533 mtx_unlock(&p->p_pptr->p_sigacts->ps_mtx);
535 if (p->p_pptr == initproc)
536 kern_psignal(p->p_pptr, SIGCHLD);
537 else if (p->p_sigparent != 0) {
538 if (p->p_sigparent == SIGCHLD)
540 else /* LINUX thread */
541 kern_psignal(p->p_pptr, p->p_sigparent);
545 PROC_LOCK(p->p_pptr);
547 sx_xunlock(&proctree_lock);
550 * The state PRS_ZOMBIE prevents other proesses from sending
551 * signal to the process, to avoid memory leak, we free memory
552 * for signal queue at the time when the state is set.
554 sigqueue_flush(&p->p_sigqueue);
555 sigqueue_flush(&td->td_sigqueue);
558 * We have to wait until after acquiring all locks before
559 * changing p_state. We need to avoid all possible context
560 * switches (including ones from blocking on a mutex) while
561 * marked as a zombie. We also have to set the zombie state
562 * before we release the parent process' proc lock to avoid
563 * a lost wakeup. So, we first call wakeup, then we grab the
564 * sched lock, update the state, and release the parent process'
568 cv_broadcast(&p->p_pwait);
569 sched_exit(p->p_pptr, td);
571 p->p_state = PRS_ZOMBIE;
572 PROC_UNLOCK(p->p_pptr);
575 * Hopefully no one will try to deliver a signal to the process this
578 knlist_destroy(&p->p_klist);
581 * Save our children's rusage information in our exit rusage.
583 ruadd(&p->p_ru, &p->p_rux, &p->p_stats->p_cru, &p->p_crux);
586 * Make sure the scheduler takes this thread out of its tables etc.
587 * This will also release this thread's reference to the ucred.
588 * Other thread parts to release include pcb bits and such.
594 #ifndef _SYS_SYSPROTO_H_
603 sys_abort2(struct thread *td, struct abort2_args *uap)
605 struct proc *p = td->td_proc;
611 * Do it right now so we can log either proper call of abort2(), or
612 * note, that invalid argument was passed. 512 is big enough to
613 * handle 16 arguments' descriptions with additional comments.
615 sb = sbuf_new(NULL, NULL, 512, SBUF_FIXEDLEN);
617 sbuf_printf(sb, "%s(pid %d uid %d) aborted: ",
618 p->p_comm, p->p_pid, td->td_ucred->cr_uid);
620 * Since we can't return from abort2(), send SIGKILL in cases, where
621 * abort2() was called improperly
624 /* Prevent from DoSes from user-space. */
625 if (uap->nargs < 0 || uap->nargs > 16)
627 if (uap->nargs > 0) {
628 if (uap->args == NULL)
630 error = copyin(uap->args, uargs, uap->nargs * sizeof(void *));
635 * Limit size of 'reason' string to 128. Will fit even when
636 * maximal number of arguments was chosen to be logged.
638 if (uap->why != NULL) {
639 error = sbuf_copyin(sb, uap->why, 128);
643 sbuf_printf(sb, "(null)");
645 if (uap->nargs > 0) {
646 sbuf_printf(sb, "(");
647 for (i = 0;i < uap->nargs; i++)
648 sbuf_printf(sb, "%s%p", i == 0 ? "" : ", ", uargs[i]);
649 sbuf_printf(sb, ")");
652 * Final stage: arguments were proper, string has been
653 * successfully copied from userspace, and copying pointers
654 * from user-space succeed.
658 if (sig == SIGKILL) {
660 sbuf_printf(sb, " (Reason text inaccessible)");
664 log(LOG_INFO, "%s", sbuf_data(sb));
666 exit1(td, W_EXITCODE(0, sig));
673 * The dirty work is handled by kern_wait().
676 owait(struct thread *td, struct owait_args *uap __unused)
680 error = kern_wait(td, WAIT_ANY, &status, 0, NULL);
682 td->td_retval[1] = status;
685 #endif /* COMPAT_43 */
688 * The dirty work is handled by kern_wait().
691 sys_wait4(struct thread *td, struct wait4_args *uap)
693 struct rusage ru, *rup;
696 if (uap->rusage != NULL)
700 error = kern_wait(td, uap->pid, &status, uap->options, rup);
701 if (uap->status != NULL && error == 0)
702 error = copyout(&status, uap->status, sizeof(status));
703 if (uap->rusage != NULL && error == 0)
704 error = copyout(&ru, uap->rusage, sizeof(struct rusage));
709 sys_wait6(struct thread *td, struct wait6_args *uap)
711 struct __wrusage wru, *wrup;
717 idtype = uap->idtype;
720 if (uap->wrusage != NULL)
725 if (uap->info != NULL) {
727 bzero(sip, sizeof(*sip));
732 * We expect all callers of wait6() to know about WEXITED and
735 error = kern_wait6(td, idtype, id, &status, uap->options, wrup, sip);
737 if (uap->status != NULL && error == 0)
738 error = copyout(&status, uap->status, sizeof(status));
739 if (uap->wrusage != NULL && error == 0)
740 error = copyout(&wru, uap->wrusage, sizeof(wru));
741 if (uap->info != NULL && error == 0)
742 error = copyout(&si, uap->info, sizeof(si));
747 * Reap the remains of a zombie process and optionally return status and
748 * rusage. Asserts and will release both the proctree_lock and the process
749 * lock as part of its work.
752 proc_reap(struct thread *td, struct proc *p, int *status, int options)
756 sx_assert(&proctree_lock, SA_XLOCKED);
757 PROC_LOCK_ASSERT(p, MA_OWNED);
758 PROC_SLOCK_ASSERT(p, MA_OWNED);
759 KASSERT(p->p_state == PRS_ZOMBIE, ("proc_reap: !PRS_ZOMBIE"));
764 td->td_retval[0] = p->p_pid;
766 *status = p->p_xstat; /* convert to int */
767 if (options & WNOWAIT) {
769 * Only poll, returning the status. Caller does not wish to
770 * release the proc struct just yet.
773 sx_xunlock(&proctree_lock);
778 sigqueue_take(p->p_ksi);
783 * If we got the child via a ptrace 'attach', we need to give it back
786 if (p->p_oppid && (t = pfind(p->p_oppid)) != NULL) {
791 pksignal(t, SIGCHLD, p->p_ksi);
793 cv_broadcast(&p->p_pwait);
795 sx_xunlock(&proctree_lock);
800 * Remove other references to this process to ensure we have an
801 * exclusive reference.
803 sx_xlock(&allproc_lock);
804 LIST_REMOVE(p, p_list); /* off zombproc */
805 sx_xunlock(&allproc_lock);
806 LIST_REMOVE(p, p_sibling);
812 if (p->p_procdesc != NULL)
815 sx_xunlock(&proctree_lock);
818 * As a side effect of this lock, we know that all other writes to
819 * this proc are visible now, so no more locking is needed for p.
822 p->p_xstat = 0; /* XXX: why? */
825 ruadd(&q->p_stats->p_cru, &q->p_crux, &p->p_ru, &p->p_rux);
829 * Decrement the count of procs running with this uid.
831 (void)chgproccnt(p->p_ucred->cr_ruidinfo, -1, 0);
834 * Destroy resource accounting information associated with the process.
838 racct_sub(p, RACCT_NPROC, 1);
844 * Free credentials, arguments, and sigacts.
848 pargs_drop(p->p_args);
850 sigacts_free(p->p_sigacts);
854 * Do any thread-system specific cleanups.
859 * Give vm and machine-dependent layer a chance to free anything that
860 * cpu_exit couldn't release while still running in process context.
866 KASSERT(FIRST_THREAD_IN_PROC(p),
867 ("proc_reap: no residual thread!"));
868 uma_zfree(proc_zone, p);
869 sx_xlock(&allproc_lock);
871 sx_xunlock(&allproc_lock);
875 proc_to_reap(struct thread *td, struct proc *p, idtype_t idtype, id_t id,
876 int *status, int options, struct __wrusage *wrusage, siginfo_t *siginfo)
881 sx_assert(&proctree_lock, SA_XLOCKED);
890 if (p->p_pid != (pid_t)id) {
896 if (p->p_pgid != (pid_t)id) {
902 if (p->p_session->s_sid != (pid_t)id) {
908 if (p->p_ucred->cr_uid != (uid_t)id) {
914 if (p->p_ucred->cr_gid != (gid_t)id) {
920 if (p->p_ucred->cr_prison->pr_id != (int)id) {
926 * It seems that the thread structures get zeroed out
927 * at process exit. This makes it impossible to
928 * support P_SETID, P_CID or P_CPUID.
935 if (p_canwait(td, p)) {
940 if (((options & WEXITED) == 0) && (p->p_state == PRS_ZOMBIE)) {
946 * This special case handles a kthread spawned by linux_clone
947 * (see linux_misc.c). The linux_wait4 and linux_waitpid
948 * functions need to be able to distinguish between waiting
949 * on a process and waiting on a thread. It is a thread if
950 * p_sigparent is not SIGCHLD, and the WLINUXCLONE option
951 * signifies we want to wait for threads and not processes.
953 if ((p->p_sigparent != SIGCHLD) ^
954 ((options & WLINUXCLONE) != 0)) {
961 if (siginfo != NULL) {
962 bzero(siginfo, sizeof(*siginfo));
963 siginfo->si_errno = 0;
966 * SUSv4 requires that the si_signo value is always
967 * SIGCHLD. Obey it despite the rfork(2) interface
968 * allows to request other signal for child exit
971 siginfo->si_signo = SIGCHLD;
974 * This is still a rough estimate. We will fix the
975 * cases TRAPPED, STOPPED, and CONTINUED later.
977 if (WCOREDUMP(p->p_xstat))
978 siginfo->si_code = CLD_DUMPED;
979 else if (WIFSIGNALED(p->p_xstat))
980 siginfo->si_code = CLD_KILLED;
982 siginfo->si_code = CLD_EXITED;
984 siginfo->si_pid = p->p_pid;
985 siginfo->si_uid = p->p_ucred->cr_uid;
986 siginfo->si_status = p->p_xstat;
989 * The si_addr field would be useful additional
990 * detail, but apparently the PC value may be lost
991 * when we reach this point. bzero() above sets
992 * siginfo->si_addr to NULL.
997 * There should be no reason to limit resources usage info to
998 * exited processes only. A snapshot about any resources used
999 * by a stopped process may be exactly what is needed.
1001 if (wrusage != NULL) {
1002 rup = &wrusage->wru_self;
1004 calcru(p, &rup->ru_utime, &rup->ru_stime);
1006 rup = &wrusage->wru_children;
1007 *rup = p->p_stats->p_cru;
1008 calccru(p, &rup->ru_utime, &rup->ru_stime);
1011 if (p->p_state == PRS_ZOMBIE) {
1012 proc_reap(td, p, status, options);
1021 kern_wait(struct thread *td, pid_t pid, int *status, int options,
1022 struct rusage *rusage)
1024 struct __wrusage wru, *wrup;
1030 * Translate the special pid values into the (idtype, pid)
1031 * pair for kern_wait6. The WAIT_MYPGRP case is handled by
1032 * kern_wait6() on its own.
1034 if (pid == WAIT_ANY) {
1037 } else if (pid < 0) {
1051 * For backward compatibility we implicitly add flags WEXITED
1052 * and WTRAPPED here.
1054 options |= WEXITED | WTRAPPED;
1055 ret = kern_wait6(td, idtype, id, status, options, wrup, NULL);
1057 *rusage = wru.wru_self;
1062 kern_wait6(struct thread *td, idtype_t idtype, id_t id, int *status,
1063 int options, struct __wrusage *wrusage, siginfo_t *siginfo)
1066 int error, nfound, ret;
1068 AUDIT_ARG_VALUE((int)idtype); /* XXX - This is likely wrong! */
1069 AUDIT_ARG_PID((pid_t)id); /* XXX - This may be wrong! */
1070 AUDIT_ARG_VALUE(options);
1074 if ((pid_t)id == WAIT_MYPGRP && (idtype == P_PID || idtype == P_PGID)) {
1076 id = (id_t)q->p_pgid;
1081 /* If we don't know the option, just return. */
1082 if ((options & ~(WUNTRACED | WNOHANG | WCONTINUED | WNOWAIT |
1083 WEXITED | WTRAPPED | WLINUXCLONE)) != 0)
1085 if ((options & (WEXITED | WUNTRACED | WCONTINUED | WTRAPPED)) == 0) {
1087 * We will be unable to find any matching processes,
1088 * because there are no known events to look for.
1089 * Prefer to return error instead of blocking
1096 if (q->p_flag & P_STATCHILD) {
1098 q->p_flag &= ~P_STATCHILD;
1102 sx_xlock(&proctree_lock);
1103 LIST_FOREACH(p, &q->p_children, p_sibling) {
1104 ret = proc_to_reap(td, p, idtype, id, status, options,
1116 if ((options & WTRAPPED) != 0 &&
1117 (p->p_flag & P_TRACED) != 0 &&
1118 (p->p_flag & (P_STOPPED_TRACE | P_STOPPED_SIG)) != 0 &&
1119 (p->p_suspcount == p->p_numthreads) &&
1120 ((p->p_flag & P_WAITED) == 0)) {
1122 if ((options & WNOWAIT) == 0)
1123 p->p_flag |= P_WAITED;
1124 sx_xunlock(&proctree_lock);
1125 td->td_retval[0] = p->p_pid;
1128 *status = W_STOPCODE(p->p_xstat);
1129 if (siginfo != NULL) {
1130 siginfo->si_status = p->p_xstat;
1131 siginfo->si_code = CLD_TRAPPED;
1133 if ((options & WNOWAIT) == 0) {
1135 sigqueue_take(p->p_ksi);
1142 if ((options & WUNTRACED) != 0 &&
1143 (p->p_flag & P_STOPPED_SIG) != 0 &&
1144 (p->p_suspcount == p->p_numthreads) &&
1145 ((p->p_flag & P_WAITED) == 0)) {
1147 if ((options & WNOWAIT) == 0)
1148 p->p_flag |= P_WAITED;
1149 sx_xunlock(&proctree_lock);
1150 td->td_retval[0] = p->p_pid;
1153 *status = W_STOPCODE(p->p_xstat);
1154 if (siginfo != NULL) {
1155 siginfo->si_status = p->p_xstat;
1156 siginfo->si_code = CLD_STOPPED;
1158 if ((options & WNOWAIT) == 0) {
1160 sigqueue_take(p->p_ksi);
1168 if ((options & WCONTINUED) != 0 &&
1169 (p->p_flag & P_CONTINUED) != 0) {
1170 sx_xunlock(&proctree_lock);
1171 td->td_retval[0] = p->p_pid;
1172 if ((options & WNOWAIT) == 0) {
1173 p->p_flag &= ~P_CONTINUED;
1175 sigqueue_take(p->p_ksi);
1182 if (siginfo != NULL) {
1183 siginfo->si_status = SIGCONT;
1184 siginfo->si_code = CLD_CONTINUED;
1192 * Look in the orphans list too, to allow the parent to
1193 * collect it's child exit status even if child is being
1196 * Debugger detaches from the parent upon successful
1197 * switch-over from parent to child. At this point due to
1198 * re-parenting the parent loses the child to debugger and a
1199 * wait4(2) call would report that it has no children to wait
1200 * for. By maintaining a list of orphans we allow the parent
1201 * to successfully wait until the child becomes a zombie.
1203 LIST_FOREACH(p, &q->p_orphans, p_orphan) {
1204 ret = proc_to_reap(td, p, idtype, id, status, options,
1214 sx_xunlock(&proctree_lock);
1217 if (options & WNOHANG) {
1218 sx_xunlock(&proctree_lock);
1219 td->td_retval[0] = 0;
1223 sx_xunlock(&proctree_lock);
1224 if (q->p_flag & P_STATCHILD) {
1225 q->p_flag &= ~P_STATCHILD;
1228 error = msleep(q, &q->p_mtx, PWAIT | PCATCH, "wait", 0);
1236 * Make process 'parent' the new parent of process 'child'.
1237 * Must be called with an exclusive hold of proctree lock.
1240 proc_reparent(struct proc *child, struct proc *parent)
1243 sx_assert(&proctree_lock, SX_XLOCKED);
1244 PROC_LOCK_ASSERT(child, MA_OWNED);
1245 if (child->p_pptr == parent)
1248 PROC_LOCK(child->p_pptr);
1249 sigqueue_take(child->p_ksi);
1250 PROC_UNLOCK(child->p_pptr);
1251 LIST_REMOVE(child, p_sibling);
1252 LIST_INSERT_HEAD(&parent->p_children, child, p_sibling);
1254 clear_orphan(child);
1255 if (child->p_flag & P_TRACED) {
1256 LIST_INSERT_HEAD(&child->p_pptr->p_orphans, child, p_orphan);
1257 child->p_flag |= P_ORPHAN;
1260 child->p_pptr = parent;