2 * Copyright (c) 1982, 1986, 1989, 1991, 1993
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4 * (c) UNIX System Laboratories, Inc.
5 * All or some portions of this file are derived from material licensed
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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 proc_realparent(struct proc *child)
105 struct proc *p, *parent;
107 sx_assert(&proctree_lock, SX_LOCKED);
108 if ((child->p_treeflag & P_TREE_ORPHANED) == 0) {
109 if (child->p_oppid == 0 ||
110 child->p_pptr->p_pid == child->p_oppid)
111 parent = child->p_pptr;
116 for (p = child; (p->p_treeflag & P_TREE_FIRST_ORPHAN) == 0;) {
117 /* Cannot use LIST_PREV(), since the list head is not known. */
118 p = __containerof(p->p_orphan.le_prev, struct proc,
120 KASSERT((p->p_treeflag & P_TREE_ORPHANED) != 0,
121 ("missing P_ORPHAN %p", p));
123 parent = __containerof(p->p_orphan.le_prev, struct proc,
129 clear_orphan(struct proc *p)
133 sx_assert(&proctree_lock, SA_XLOCKED);
134 if ((p->p_treeflag & P_TREE_ORPHANED) == 0)
136 if ((p->p_treeflag & P_TREE_FIRST_ORPHAN) != 0) {
137 p1 = LIST_NEXT(p, p_orphan);
139 p1->p_treeflag |= P_TREE_FIRST_ORPHAN;
140 p->p_treeflag &= ~P_TREE_FIRST_ORPHAN;
142 LIST_REMOVE(p, p_orphan);
143 p->p_treeflag &= ~P_TREE_ORPHANED;
147 * exit -- death of process.
150 sys_sys_exit(struct thread *td, struct sys_exit_args *uap)
153 exit1(td, W_EXITCODE(uap->rval, 0));
158 * Exit: deallocate address space and other resources, change proc state to
159 * zombie, and unlink proc from allproc and parent's lists. Save exit status
160 * and rusage for wait(). Check for child processes and orphan them.
163 exit1(struct thread *td, int rv)
165 struct proc *p, *nq, *q;
166 struct vnode *ttyvp = NULL;
168 mtx_assert(&Giant, MA_NOTOWNED);
172 * XXX in case we're rebooting we just let init die in order to
173 * work around an unsolved stack overflow seen very late during
174 * shutdown on sparc64 when the gmirror worker process exists.
176 if (p == initproc && rebooting == 0) {
177 printf("init died (signal %d, exit %d)\n",
178 WTERMSIG(rv), WEXITSTATUS(rv));
179 panic("Going nowhere without my init!");
183 * MUST abort all other threads before proceeding past here.
186 while (p->p_flag & P_HADTHREADS) {
188 * First check if some other thread got here before us.
189 * If so, act appropriately: exit or suspend.
191 thread_suspend_check(0);
194 * Kill off the other threads. This requires
195 * some co-operation from other parts of the kernel
196 * so it may not be instantaneous. With this state set
197 * any thread entering the kernel from userspace will
198 * thread_exit() in trap(). Any thread attempting to
199 * sleep will return immediately with EINTR or EWOULDBLOCK
200 * which will hopefully force them to back out to userland
201 * freeing resources as they go. Any thread attempting
202 * to return to userland will thread_exit() from userret().
203 * thread_exit() will unsuspend us when the last of the
204 * other threads exits.
205 * If there is already a thread singler after resumption,
206 * calling thread_single will fail; in that case, we just
207 * re-check all suspension request, the thread should
208 * either be suspended there or exit.
210 if (!thread_single(SINGLE_EXIT))
214 * All other activity in this process is now stopped.
215 * Threading support has been turned off.
218 KASSERT(p->p_numthreads == 1,
219 ("exit1: proc %p exiting with %d threads", p, p->p_numthreads));
220 racct_sub(p, RACCT_NTHR, 1);
222 * Wakeup anyone in procfs' PIOCWAIT. They should have a hold
223 * on our vmspace, so we should block below until they have
224 * released their reference to us. Note that if they have
225 * requested S_EXIT stops we will block here until they ack
228 _STOPEVENT(p, S_EXIT, rv);
231 * Ignore any pending request to stop due to a stop signal.
232 * Once P_WEXIT is set, future requests will be ignored as
235 p->p_flag &= ~P_STOPPED_SIG;
236 KASSERT(!P_SHOULDSTOP(p), ("exiting process is stopped"));
239 * Note that we are exiting and do another wakeup of anyone in
240 * PIOCWAIT in case they aren't listening for S_EXIT stops or
241 * decided to wait again after we told them we are exiting.
243 p->p_flag |= P_WEXIT;
247 * Wait for any processes that have a hold on our vmspace to
248 * release their reference.
250 while (p->p_lock > 0)
251 msleep(&p->p_lock, &p->p_mtx, PWAIT, "exithold", 0);
253 p->p_xstat = rv; /* Let event handler change exit status */
255 /* Drain the limit callout while we don't have the proc locked */
256 callout_drain(&p->p_limco);
260 * The Sun BSM exit token contains two components: an exit status as
261 * passed to exit(), and a return value to indicate what sort of exit
262 * it was. The exit status is WEXITSTATUS(rv), but it's not clear
263 * what the return value is.
265 AUDIT_ARG_EXIT(WEXITSTATUS(rv), 0);
266 AUDIT_SYSCALL_EXIT(0, td);
269 /* Are we a task leader? */
270 if (p == p->p_leader) {
271 mtx_lock(&ppeers_lock);
275 kern_psignal(q, SIGKILL);
279 while (p->p_peers != NULL)
280 msleep(p, &ppeers_lock, PWAIT, "exit1", 0);
281 mtx_unlock(&ppeers_lock);
285 * Check if any loadable modules need anything done at process exit.
286 * E.g. SYSV IPC stuff
287 * XXX what if one of these generates an error?
289 EVENTHANDLER_INVOKE(process_exit, p);
292 * If parent is waiting for us to exit or exec,
293 * P_PPWAIT is set; we will wakeup the parent below.
296 rv = p->p_xstat; /* Event handler could change exit status */
298 p->p_flag &= ~(P_TRACED | P_PPWAIT | P_PPTRACE);
301 * Stop the real interval timer. If the handler is currently
302 * executing, prevent it from rearming itself and let it finish.
304 if (timevalisset(&p->p_realtimer.it_value) &&
305 callout_stop(&p->p_itcallout) == 0) {
306 timevalclear(&p->p_realtimer.it_interval);
307 msleep(&p->p_itcallout, &p->p_mtx, PWAIT, "ritwait", 0);
308 KASSERT(!timevalisset(&p->p_realtimer.it_value),
309 ("realtime timer is still armed"));
314 * Reset any sigio structures pointing to us as a result of
315 * F_SETOWN with our pid.
317 funsetownlst(&p->p_sigiolst);
320 * If this process has an nlminfo data area (for lockd), release it
322 if (nlminfo_release_p != NULL && p->p_nlminfo != NULL)
323 (*nlminfo_release_p)(p);
326 * Close open files and release open-file table.
332 * If this thread tickled GEOM, we need to wait for the giggling to
333 * stop before we return to userland
335 if (td->td_pflags & TDP_GEOM)
339 * Remove ourself from our leader's peer list and wake our leader.
341 mtx_lock(&ppeers_lock);
342 if (p->p_leader->p_peers) {
344 while (q->p_peers != p)
346 q->p_peers = p->p_peers;
349 mtx_unlock(&ppeers_lock);
353 sx_xlock(&proctree_lock);
354 if (SESS_LEADER(p)) {
355 struct session *sp = p->p_session;
359 * s_ttyp is not zero'd; we use this to indicate that
360 * the session once had a controlling terminal. (for
361 * logging and informational purposes)
372 * Signal foreground pgrp and revoke access to
373 * controlling terminal if it has not been revoked
376 * Because the TTY may have been revoked in the mean
377 * time and could already have a new session associated
378 * with it, make sure we don't send a SIGHUP to a
379 * foreground process group that does not belong to this
385 if (tp->t_session == sp)
386 tty_signal_pgrp(tp, SIGHUP);
391 sx_xunlock(&proctree_lock);
392 if (vn_lock(ttyvp, LK_EXCLUSIVE) == 0) {
393 VOP_REVOKE(ttyvp, REVOKEALL);
394 VOP_UNLOCK(ttyvp, 0);
396 sx_xlock(&proctree_lock);
399 fixjobc(p, p->p_pgrp, 0);
400 sx_xunlock(&proctree_lock);
401 (void)acct_process(td);
403 /* Release the TTY now we've unlocked everything. */
410 * Release reference to text vnode
412 if (p->p_textvp != NULL) {
418 * Release our limits structure.
420 lim_free(p->p_limit);
426 * Remove proc from allproc queue and pidhash chain.
427 * Place onto zombproc. Unlink from parent's child list.
429 sx_xlock(&allproc_lock);
430 LIST_REMOVE(p, p_list);
431 LIST_INSERT_HEAD(&zombproc, p, p_list);
432 LIST_REMOVE(p, p_hash);
433 sx_xunlock(&allproc_lock);
436 * Call machine-dependent code to release any
437 * machine-dependent resources other than the address space.
438 * The address space is released by "vmspace_exitfree(p)" in
443 WITNESS_WARN(WARN_PANIC, NULL, "process (pid %d) exiting", p->p_pid);
446 * Reparent all of our children to init.
448 sx_xlock(&proctree_lock);
449 q = LIST_FIRST(&p->p_children);
450 if (q != NULL) /* only need this if any child is S_ZOMB */
452 for (; q != NULL; q = nq) {
453 nq = LIST_NEXT(q, p_sibling);
455 proc_reparent(q, initproc);
456 q->p_sigparent = SIGCHLD;
458 * Traced processes are killed
459 * since their existence means someone is screwing up.
461 if (q->p_flag & P_TRACED) {
465 * Since q was found on our children list, the
466 * proc_reparent() call moved q to the orphan
467 * list due to present P_TRACED flag. Clear
468 * orphan link for q now while q is locked.
471 q->p_flag &= ~(P_TRACED | P_STOPPED_TRACE);
472 FOREACH_THREAD_IN_PROC(q, temp)
473 temp->td_dbgflags &= ~TDB_SUSPEND;
474 kern_psignal(q, SIGKILL);
480 * Also get rid of our orphans.
482 while ((q = LIST_FIRST(&p->p_orphans)) != NULL) {
488 /* Save exit status. */
492 /* Tell the prison that we are gone. */
493 prison_proc_free(p->p_ucred->cr_prison);
497 * Tell the DTrace fasttrap provider about the exit if it
498 * has declared an interest.
500 if (dtrace_fasttrap_exit)
501 dtrace_fasttrap_exit(p);
505 * Notify interested parties of our demise.
507 KNOTE_LOCKED(&p->p_klist, NOTE_EXIT);
510 int reason = CLD_EXITED;
513 else if (WIFSIGNALED(rv))
515 SDT_PROBE(proc, kernel, , exit, reason, 0, 0, 0, 0);
519 * Just delete all entries in the p_klist. At this point we won't
520 * report any more events, and there are nasty race conditions that
521 * can beat us if we don't.
523 knlist_clear(&p->p_klist, 1);
526 * If this is a process with a descriptor, we may not need to deliver
527 * a signal to the parent. proctree_lock is held over
528 * procdesc_exit() to serialize concurrent calls to close() and
532 if (p->p_procdesc == NULL || procdesc_exit(p)) {
535 * Notify parent that we're gone. If parent has the
536 * PS_NOCLDWAIT flag set, or if the handler is set to SIG_IGN,
537 * notify process 1 instead (and hope it will handle this
540 PROC_LOCK(p->p_pptr);
541 mtx_lock(&p->p_pptr->p_sigacts->ps_mtx);
542 if (p->p_pptr->p_sigacts->ps_flag &
543 (PS_NOCLDWAIT | PS_CLDSIGIGN)) {
546 mtx_unlock(&p->p_pptr->p_sigacts->ps_mtx);
549 proc_reparent(p, initproc);
550 p->p_sigparent = SIGCHLD;
551 PROC_LOCK(p->p_pptr);
554 * Notify parent, so in case he was wait(2)ing or
555 * executing waitpid(2) with our pid, he will
560 mtx_unlock(&p->p_pptr->p_sigacts->ps_mtx);
562 if (p->p_pptr == initproc)
563 kern_psignal(p->p_pptr, SIGCHLD);
564 else if (p->p_sigparent != 0) {
565 if (p->p_sigparent == SIGCHLD)
567 else /* LINUX thread */
568 kern_psignal(p->p_pptr, p->p_sigparent);
572 PROC_LOCK(p->p_pptr);
574 sx_xunlock(&proctree_lock);
577 * The state PRS_ZOMBIE prevents other proesses from sending
578 * signal to the process, to avoid memory leak, we free memory
579 * for signal queue at the time when the state is set.
581 sigqueue_flush(&p->p_sigqueue);
582 sigqueue_flush(&td->td_sigqueue);
585 * We have to wait until after acquiring all locks before
586 * changing p_state. We need to avoid all possible context
587 * switches (including ones from blocking on a mutex) while
588 * marked as a zombie. We also have to set the zombie state
589 * before we release the parent process' proc lock to avoid
590 * a lost wakeup. So, we first call wakeup, then we grab the
591 * sched lock, update the state, and release the parent process'
595 cv_broadcast(&p->p_pwait);
596 sched_exit(p->p_pptr, td);
598 p->p_state = PRS_ZOMBIE;
599 PROC_UNLOCK(p->p_pptr);
602 * Hopefully no one will try to deliver a signal to the process this
605 knlist_destroy(&p->p_klist);
608 * Save our children's rusage information in our exit rusage.
610 ruadd(&p->p_ru, &p->p_rux, &p->p_stats->p_cru, &p->p_crux);
613 * Make sure the scheduler takes this thread out of its tables etc.
614 * This will also release this thread's reference to the ucred.
615 * Other thread parts to release include pcb bits and such.
621 #ifndef _SYS_SYSPROTO_H_
630 sys_abort2(struct thread *td, struct abort2_args *uap)
632 struct proc *p = td->td_proc;
638 * Do it right now so we can log either proper call of abort2(), or
639 * note, that invalid argument was passed. 512 is big enough to
640 * handle 16 arguments' descriptions with additional comments.
642 sb = sbuf_new(NULL, NULL, 512, SBUF_FIXEDLEN);
644 sbuf_printf(sb, "%s(pid %d uid %d) aborted: ",
645 p->p_comm, p->p_pid, td->td_ucred->cr_uid);
647 * Since we can't return from abort2(), send SIGKILL in cases, where
648 * abort2() was called improperly
651 /* Prevent from DoSes from user-space. */
652 if (uap->nargs < 0 || uap->nargs > 16)
654 if (uap->nargs > 0) {
655 if (uap->args == NULL)
657 error = copyin(uap->args, uargs, uap->nargs * sizeof(void *));
662 * Limit size of 'reason' string to 128. Will fit even when
663 * maximal number of arguments was chosen to be logged.
665 if (uap->why != NULL) {
666 error = sbuf_copyin(sb, uap->why, 128);
670 sbuf_printf(sb, "(null)");
672 if (uap->nargs > 0) {
673 sbuf_printf(sb, "(");
674 for (i = 0;i < uap->nargs; i++)
675 sbuf_printf(sb, "%s%p", i == 0 ? "" : ", ", uargs[i]);
676 sbuf_printf(sb, ")");
679 * Final stage: arguments were proper, string has been
680 * successfully copied from userspace, and copying pointers
681 * from user-space succeed.
685 if (sig == SIGKILL) {
687 sbuf_printf(sb, " (Reason text inaccessible)");
691 log(LOG_INFO, "%s", sbuf_data(sb));
693 exit1(td, W_EXITCODE(0, sig));
700 * The dirty work is handled by kern_wait().
703 owait(struct thread *td, struct owait_args *uap __unused)
707 error = kern_wait(td, WAIT_ANY, &status, 0, NULL);
709 td->td_retval[1] = status;
712 #endif /* COMPAT_43 */
715 * The dirty work is handled by kern_wait().
718 sys_wait4(struct thread *td, struct wait4_args *uap)
720 struct rusage ru, *rup;
723 if (uap->rusage != NULL)
727 error = kern_wait(td, uap->pid, &status, uap->options, rup);
728 if (uap->status != NULL && error == 0)
729 error = copyout(&status, uap->status, sizeof(status));
730 if (uap->rusage != NULL && error == 0)
731 error = copyout(&ru, uap->rusage, sizeof(struct rusage));
736 sys_wait6(struct thread *td, struct wait6_args *uap)
738 struct __wrusage wru, *wrup;
744 idtype = uap->idtype;
747 if (uap->wrusage != NULL)
752 if (uap->info != NULL) {
754 bzero(sip, sizeof(*sip));
759 * We expect all callers of wait6() to know about WEXITED and
762 error = kern_wait6(td, idtype, id, &status, uap->options, wrup, sip);
764 if (uap->status != NULL && error == 0)
765 error = copyout(&status, uap->status, sizeof(status));
766 if (uap->wrusage != NULL && error == 0)
767 error = copyout(&wru, uap->wrusage, sizeof(wru));
768 if (uap->info != NULL && error == 0)
769 error = copyout(&si, uap->info, sizeof(si));
774 * Reap the remains of a zombie process and optionally return status and
775 * rusage. Asserts and will release both the proctree_lock and the process
776 * lock as part of its work.
779 proc_reap(struct thread *td, struct proc *p, int *status, int options)
783 sx_assert(&proctree_lock, SA_XLOCKED);
784 PROC_LOCK_ASSERT(p, MA_OWNED);
785 PROC_SLOCK_ASSERT(p, MA_OWNED);
786 KASSERT(p->p_state == PRS_ZOMBIE, ("proc_reap: !PRS_ZOMBIE"));
791 td->td_retval[0] = p->p_pid;
793 *status = p->p_xstat; /* convert to int */
794 if (options & WNOWAIT) {
796 * Only poll, returning the status. Caller does not wish to
797 * release the proc struct just yet.
800 sx_xunlock(&proctree_lock);
805 sigqueue_take(p->p_ksi);
810 * If we got the child via a ptrace 'attach', we need to give it back
813 if (p->p_oppid != 0) {
814 t = proc_realparent(p);
820 pksignal(t, SIGCHLD, p->p_ksi);
822 cv_broadcast(&p->p_pwait);
824 sx_xunlock(&proctree_lock);
829 * Remove other references to this process to ensure we have an
830 * exclusive reference.
832 sx_xlock(&allproc_lock);
833 LIST_REMOVE(p, p_list); /* off zombproc */
834 sx_xunlock(&allproc_lock);
835 LIST_REMOVE(p, p_sibling);
841 if (p->p_procdesc != NULL)
844 sx_xunlock(&proctree_lock);
847 * As a side effect of this lock, we know that all other writes to
848 * this proc are visible now, so no more locking is needed for p.
851 p->p_xstat = 0; /* XXX: why? */
854 ruadd(&q->p_stats->p_cru, &q->p_crux, &p->p_ru, &p->p_rux);
858 * Decrement the count of procs running with this uid.
860 (void)chgproccnt(p->p_ucred->cr_ruidinfo, -1, 0);
863 * Destroy resource accounting information associated with the process.
867 racct_sub(p, RACCT_NPROC, 1);
873 * Free credentials, arguments, and sigacts.
877 pargs_drop(p->p_args);
879 sigacts_free(p->p_sigacts);
883 * Do any thread-system specific cleanups.
888 * Give vm and machine-dependent layer a chance to free anything that
889 * cpu_exit couldn't release while still running in process context.
895 KASSERT(FIRST_THREAD_IN_PROC(p),
896 ("proc_reap: no residual thread!"));
897 uma_zfree(proc_zone, p);
898 sx_xlock(&allproc_lock);
900 sx_xunlock(&allproc_lock);
904 proc_to_reap(struct thread *td, struct proc *p, idtype_t idtype, id_t id,
905 int *status, int options, struct __wrusage *wrusage, siginfo_t *siginfo)
910 sx_assert(&proctree_lock, SA_XLOCKED);
919 if (p->p_pid != (pid_t)id) {
925 if (p->p_pgid != (pid_t)id) {
931 if (p->p_session->s_sid != (pid_t)id) {
937 if (p->p_ucred->cr_uid != (uid_t)id) {
943 if (p->p_ucred->cr_gid != (gid_t)id) {
949 if (p->p_ucred->cr_prison->pr_id != (int)id) {
955 * It seems that the thread structures get zeroed out
956 * at process exit. This makes it impossible to
957 * support P_SETID, P_CID or P_CPUID.
964 if (p_canwait(td, p)) {
969 if (((options & WEXITED) == 0) && (p->p_state == PRS_ZOMBIE)) {
975 * This special case handles a kthread spawned by linux_clone
976 * (see linux_misc.c). The linux_wait4 and linux_waitpid
977 * functions need to be able to distinguish between waiting
978 * on a process and waiting on a thread. It is a thread if
979 * p_sigparent is not SIGCHLD, and the WLINUXCLONE option
980 * signifies we want to wait for threads and not processes.
982 if ((p->p_sigparent != SIGCHLD) ^
983 ((options & WLINUXCLONE) != 0)) {
990 if (siginfo != NULL) {
991 bzero(siginfo, sizeof(*siginfo));
992 siginfo->si_errno = 0;
995 * SUSv4 requires that the si_signo value is always
996 * SIGCHLD. Obey it despite the rfork(2) interface
997 * allows to request other signal for child exit
1000 siginfo->si_signo = SIGCHLD;
1003 * This is still a rough estimate. We will fix the
1004 * cases TRAPPED, STOPPED, and CONTINUED later.
1006 if (WCOREDUMP(p->p_xstat)) {
1007 siginfo->si_code = CLD_DUMPED;
1008 siginfo->si_status = WTERMSIG(p->p_xstat);
1009 } else if (WIFSIGNALED(p->p_xstat)) {
1010 siginfo->si_code = CLD_KILLED;
1011 siginfo->si_status = WTERMSIG(p->p_xstat);
1013 siginfo->si_code = CLD_EXITED;
1014 siginfo->si_status = WEXITSTATUS(p->p_xstat);
1017 siginfo->si_pid = p->p_pid;
1018 siginfo->si_uid = p->p_ucred->cr_uid;
1021 * The si_addr field would be useful additional
1022 * detail, but apparently the PC value may be lost
1023 * when we reach this point. bzero() above sets
1024 * siginfo->si_addr to NULL.
1029 * There should be no reason to limit resources usage info to
1030 * exited processes only. A snapshot about any resources used
1031 * by a stopped process may be exactly what is needed.
1033 if (wrusage != NULL) {
1034 rup = &wrusage->wru_self;
1036 calcru(p, &rup->ru_utime, &rup->ru_stime);
1038 rup = &wrusage->wru_children;
1039 *rup = p->p_stats->p_cru;
1040 calccru(p, &rup->ru_utime, &rup->ru_stime);
1043 if (p->p_state == PRS_ZOMBIE) {
1044 proc_reap(td, p, status, options);
1053 kern_wait(struct thread *td, pid_t pid, int *status, int options,
1054 struct rusage *rusage)
1056 struct __wrusage wru, *wrup;
1062 * Translate the special pid values into the (idtype, pid)
1063 * pair for kern_wait6. The WAIT_MYPGRP case is handled by
1064 * kern_wait6() on its own.
1066 if (pid == WAIT_ANY) {
1069 } else if (pid < 0) {
1083 * For backward compatibility we implicitly add flags WEXITED
1084 * and WTRAPPED here.
1086 options |= WEXITED | WTRAPPED;
1087 ret = kern_wait6(td, idtype, id, status, options, wrup, NULL);
1089 *rusage = wru.wru_self;
1094 kern_wait6(struct thread *td, idtype_t idtype, id_t id, int *status,
1095 int options, struct __wrusage *wrusage, siginfo_t *siginfo)
1098 int error, nfound, ret;
1100 AUDIT_ARG_VALUE((int)idtype); /* XXX - This is likely wrong! */
1101 AUDIT_ARG_PID((pid_t)id); /* XXX - This may be wrong! */
1102 AUDIT_ARG_VALUE(options);
1106 if ((pid_t)id == WAIT_MYPGRP && (idtype == P_PID || idtype == P_PGID)) {
1108 id = (id_t)q->p_pgid;
1113 /* If we don't know the option, just return. */
1114 if ((options & ~(WUNTRACED | WNOHANG | WCONTINUED | WNOWAIT |
1115 WEXITED | WTRAPPED | WLINUXCLONE)) != 0)
1117 if ((options & (WEXITED | WUNTRACED | WCONTINUED | WTRAPPED)) == 0) {
1119 * We will be unable to find any matching processes,
1120 * because there are no known events to look for.
1121 * Prefer to return error instead of blocking
1128 if (q->p_flag & P_STATCHILD) {
1130 q->p_flag &= ~P_STATCHILD;
1134 sx_xlock(&proctree_lock);
1135 LIST_FOREACH(p, &q->p_children, p_sibling) {
1136 ret = proc_to_reap(td, p, idtype, id, status, options,
1148 if ((options & WTRAPPED) != 0 &&
1149 (p->p_flag & P_TRACED) != 0 &&
1150 (p->p_flag & (P_STOPPED_TRACE | P_STOPPED_SIG)) != 0 &&
1151 (p->p_suspcount == p->p_numthreads) &&
1152 ((p->p_flag & P_WAITED) == 0)) {
1154 if ((options & WNOWAIT) == 0)
1155 p->p_flag |= P_WAITED;
1156 sx_xunlock(&proctree_lock);
1157 td->td_retval[0] = p->p_pid;
1160 *status = W_STOPCODE(p->p_xstat);
1161 if (siginfo != NULL) {
1162 siginfo->si_status = p->p_xstat;
1163 siginfo->si_code = CLD_TRAPPED;
1165 if ((options & WNOWAIT) == 0) {
1167 sigqueue_take(p->p_ksi);
1174 if ((options & WUNTRACED) != 0 &&
1175 (p->p_flag & P_STOPPED_SIG) != 0 &&
1176 (p->p_suspcount == p->p_numthreads) &&
1177 ((p->p_flag & P_WAITED) == 0)) {
1179 if ((options & WNOWAIT) == 0)
1180 p->p_flag |= P_WAITED;
1181 sx_xunlock(&proctree_lock);
1182 td->td_retval[0] = p->p_pid;
1185 *status = W_STOPCODE(p->p_xstat);
1186 if (siginfo != NULL) {
1187 siginfo->si_status = p->p_xstat;
1188 siginfo->si_code = CLD_STOPPED;
1190 if ((options & WNOWAIT) == 0) {
1192 sigqueue_take(p->p_ksi);
1200 if ((options & WCONTINUED) != 0 &&
1201 (p->p_flag & P_CONTINUED) != 0) {
1202 sx_xunlock(&proctree_lock);
1203 td->td_retval[0] = p->p_pid;
1204 if ((options & WNOWAIT) == 0) {
1205 p->p_flag &= ~P_CONTINUED;
1207 sigqueue_take(p->p_ksi);
1214 if (siginfo != NULL) {
1215 siginfo->si_status = SIGCONT;
1216 siginfo->si_code = CLD_CONTINUED;
1224 * Look in the orphans list too, to allow the parent to
1225 * collect it's child exit status even if child is being
1228 * Debugger detaches from the parent upon successful
1229 * switch-over from parent to child. At this point due to
1230 * re-parenting the parent loses the child to debugger and a
1231 * wait4(2) call would report that it has no children to wait
1232 * for. By maintaining a list of orphans we allow the parent
1233 * to successfully wait until the child becomes a zombie.
1235 LIST_FOREACH(p, &q->p_orphans, p_orphan) {
1236 ret = proc_to_reap(td, p, idtype, id, status, options,
1246 sx_xunlock(&proctree_lock);
1249 if (options & WNOHANG) {
1250 sx_xunlock(&proctree_lock);
1251 td->td_retval[0] = 0;
1255 sx_xunlock(&proctree_lock);
1256 if (q->p_flag & P_STATCHILD) {
1257 q->p_flag &= ~P_STATCHILD;
1260 error = msleep(q, &q->p_mtx, PWAIT | PCATCH, "wait", 0);
1268 * Make process 'parent' the new parent of process 'child'.
1269 * Must be called with an exclusive hold of proctree lock.
1272 proc_reparent(struct proc *child, struct proc *parent)
1275 sx_assert(&proctree_lock, SX_XLOCKED);
1276 PROC_LOCK_ASSERT(child, MA_OWNED);
1277 if (child->p_pptr == parent)
1280 PROC_LOCK(child->p_pptr);
1281 sigqueue_take(child->p_ksi);
1282 PROC_UNLOCK(child->p_pptr);
1283 LIST_REMOVE(child, p_sibling);
1284 LIST_INSERT_HEAD(&parent->p_children, child, p_sibling);
1286 clear_orphan(child);
1287 if (child->p_flag & P_TRACED) {
1288 if (LIST_EMPTY(&child->p_pptr->p_orphans)) {
1289 child->p_treeflag |= P_TREE_FIRST_ORPHAN;
1290 LIST_INSERT_HEAD(&child->p_pptr->p_orphans, child,
1293 LIST_INSERT_AFTER(LIST_FIRST(&child->p_pptr->p_orphans),
1296 child->p_treeflag |= P_TREE_ORPHANED;
1299 child->p_pptr = parent;