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
6 * to the University of California by American Telephone and Telegraph
7 * Co. or Unix System Laboratories, Inc. and are reproduced herein with
8 * the permission of UNIX System Laboratories, Inc.
10 * Redistribution and use in source and binary forms, with or without
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
16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials provided with the distribution.
18 * 4. Neither the name of the University nor the names of its contributors
19 * may be used to endorse or promote products derived from this software
20 * without specific prior written permission.
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
24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
25 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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_DEFINE(proc, kernel, , exit, exit);
98 SDT_PROBE_ARGTYPE(proc, kernel, , exit, 0, "int");
100 /* Hook for NFS teardown procedure. */
101 void (*nlminfo_release_p)(struct proc *p);
104 clear_orphan(struct proc *p)
107 PROC_LOCK_ASSERT(p, MA_OWNED);
109 if (p->p_flag & P_ORPHAN) {
110 LIST_REMOVE(p, p_orphan);
111 p->p_flag &= ~P_ORPHAN;
116 * exit -- death of process.
119 sys_sys_exit(struct thread *td, struct sys_exit_args *uap)
122 exit1(td, W_EXITCODE(uap->rval, 0));
127 * Exit: deallocate address space and other resources, change proc state to
128 * zombie, and unlink proc from allproc and parent's lists. Save exit status
129 * and rusage for wait(). Check for child processes and orphan them.
132 exit1(struct thread *td, int rv)
134 struct proc *p, *nq, *q;
136 struct vnode *ttyvp = NULL;
140 mtx_assert(&Giant, MA_NOTOWNED);
144 * XXX in case we're rebooting we just let init die in order to
145 * work around an unsolved stack overflow seen very late during
146 * shutdown on sparc64 when the gmirror worker process exists.
148 if (p == initproc && rebooting == 0) {
149 printf("init died (signal %d, exit %d)\n",
150 WTERMSIG(rv), WEXITSTATUS(rv));
151 panic("Going nowhere without my init!");
155 * MUST abort all other threads before proceeding past here.
158 while (p->p_flag & P_HADTHREADS) {
160 * First check if some other thread got here before us..
161 * if so, act apropriatly, (exit or suspend);
163 thread_suspend_check(0);
166 * Kill off the other threads. This requires
167 * some co-operation from other parts of the kernel
168 * so it may not be instantaneous. With this state set
169 * any thread entering the kernel from userspace will
170 * thread_exit() in trap(). Any thread attempting to
171 * sleep will return immediately with EINTR or EWOULDBLOCK
172 * which will hopefully force them to back out to userland
173 * freeing resources as they go. Any thread attempting
174 * to return to userland will thread_exit() from userret().
175 * thread_exit() will unsuspend us when the last of the
176 * other threads exits.
177 * If there is already a thread singler after resumption,
178 * calling thread_single will fail; in that case, we just
179 * re-check all suspension request, the thread should
180 * either be suspended there or exit.
182 if (! thread_single(SINGLE_EXIT))
186 * All other activity in this process is now stopped.
187 * Threading support has been turned off.
190 KASSERT(p->p_numthreads == 1,
191 ("exit1: proc %p exiting with %d threads", p, p->p_numthreads));
192 racct_sub(p, RACCT_NTHR, 1);
194 * Wakeup anyone in procfs' PIOCWAIT. They should have a hold
195 * on our vmspace, so we should block below until they have
196 * released their reference to us. Note that if they have
197 * requested S_EXIT stops we will block here until they ack
200 _STOPEVENT(p, S_EXIT, rv);
203 * Note that we are exiting and do another wakeup of anyone in
204 * PIOCWAIT in case they aren't listening for S_EXIT stops or
205 * decided to wait again after we told them we are exiting.
207 p->p_flag |= P_WEXIT;
211 * Wait for any processes that have a hold on our vmspace to
212 * release their reference.
214 while (p->p_lock > 0)
215 msleep(&p->p_lock, &p->p_mtx, PWAIT, "exithold", 0);
217 p->p_xstat = rv; /* Let event handler change exit status */
219 /* Drain the limit callout while we don't have the proc locked */
220 callout_drain(&p->p_limco);
224 * The Sun BSM exit token contains two components: an exit status as
225 * passed to exit(), and a return value to indicate what sort of exit
226 * it was. The exit status is WEXITSTATUS(rv), but it's not clear
227 * what the return value is.
229 AUDIT_ARG_EXIT(WEXITSTATUS(rv), 0);
230 AUDIT_SYSCALL_EXIT(0, td);
233 /* Are we a task leader? */
234 if (p == p->p_leader) {
235 mtx_lock(&ppeers_lock);
239 kern_psignal(q, SIGKILL);
243 while (p->p_peers != NULL)
244 msleep(p, &ppeers_lock, PWAIT, "exit1", 0);
245 mtx_unlock(&ppeers_lock);
249 * Check if any loadable modules need anything done at process exit.
250 * E.g. SYSV IPC stuff
251 * XXX what if one of these generates an error?
253 EVENTHANDLER_INVOKE(process_exit, p);
256 * If parent is waiting for us to exit or exec,
257 * P_PPWAIT is set; we will wakeup the parent below.
260 rv = p->p_xstat; /* Event handler could change exit status */
262 p->p_flag &= ~(P_TRACED | P_PPWAIT);
265 * Stop the real interval timer. If the handler is currently
266 * executing, prevent it from rearming itself and let it finish.
268 if (timevalisset(&p->p_realtimer.it_value) &&
269 callout_stop(&p->p_itcallout) == 0) {
270 timevalclear(&p->p_realtimer.it_interval);
271 msleep(&p->p_itcallout, &p->p_mtx, PWAIT, "ritwait", 0);
272 KASSERT(!timevalisset(&p->p_realtimer.it_value),
273 ("realtime timer is still armed"));
278 * Reset any sigio structures pointing to us as a result of
279 * F_SETOWN with our pid.
281 funsetownlst(&p->p_sigiolst);
284 * If this process has an nlminfo data area (for lockd), release it
286 if (nlminfo_release_p != NULL && p->p_nlminfo != NULL)
287 (*nlminfo_release_p)(p);
290 * Close open files and release open-file table.
296 * If this thread tickled GEOM, we need to wait for the giggling to
297 * stop before we return to userland
299 if (td->td_pflags & TDP_GEOM)
303 * Remove ourself from our leader's peer list and wake our leader.
305 mtx_lock(&ppeers_lock);
306 if (p->p_leader->p_peers) {
308 while (q->p_peers != p)
310 q->p_peers = p->p_peers;
313 mtx_unlock(&ppeers_lock);
317 sx_xlock(&proctree_lock);
318 if (SESS_LEADER(p)) {
319 struct session *sp = p->p_session;
323 * s_ttyp is not zero'd; we use this to indicate that
324 * the session once had a controlling terminal. (for
325 * logging and informational purposes)
336 * Signal foreground pgrp and revoke access to
337 * controlling terminal if it has not been revoked
340 * Because the TTY may have been revoked in the mean
341 * time and could already have a new session associated
342 * with it, make sure we don't send a SIGHUP to a
343 * foreground process group that does not belong to this
349 if (tp->t_session == sp)
350 tty_signal_pgrp(tp, SIGHUP);
355 sx_xunlock(&proctree_lock);
356 if (vn_lock(ttyvp, LK_EXCLUSIVE) == 0) {
357 VOP_REVOKE(ttyvp, REVOKEALL);
358 VOP_UNLOCK(ttyvp, 0);
360 sx_xlock(&proctree_lock);
363 fixjobc(p, p->p_pgrp, 0);
364 sx_xunlock(&proctree_lock);
365 (void)acct_process(td);
367 /* Release the TTY now we've unlocked everything. */
374 * Release reference to text vnode
376 if ((vtmp = p->p_textvp) != NULL) {
378 locked = VFS_LOCK_GIANT(vtmp->v_mount);
380 VFS_UNLOCK_GIANT(locked);
384 * Release our limits structure.
395 * Remove proc from allproc queue and pidhash chain.
396 * Place onto zombproc. Unlink from parent's child list.
398 sx_xlock(&allproc_lock);
399 LIST_REMOVE(p, p_list);
400 LIST_INSERT_HEAD(&zombproc, p, p_list);
401 LIST_REMOVE(p, p_hash);
402 sx_xunlock(&allproc_lock);
405 * Call machine-dependent code to release any
406 * machine-dependent resources other than the address space.
407 * The address space is released by "vmspace_exitfree(p)" in
412 WITNESS_WARN(WARN_PANIC, NULL, "process (pid %d) exiting", p->p_pid);
415 * Reparent all of our children to init.
417 sx_xlock(&proctree_lock);
418 q = LIST_FIRST(&p->p_children);
419 if (q != NULL) /* only need this if any child is S_ZOMB */
421 for (; q != NULL; q = nq) {
422 nq = LIST_NEXT(q, p_sibling);
424 proc_reparent(q, initproc);
425 q->p_sigparent = SIGCHLD;
427 * Traced processes are killed
428 * since their existence means someone is screwing up.
430 if (q->p_flag & P_TRACED) {
434 * Since q was found on our children list, the
435 * proc_reparent() call moved q to the orphan
436 * list due to present P_TRACED flag. Clear
437 * orphan link for q now while q is locked.
440 q->p_flag &= ~(P_TRACED | P_STOPPED_TRACE);
441 FOREACH_THREAD_IN_PROC(q, temp)
442 temp->td_dbgflags &= ~TDB_SUSPEND;
443 kern_psignal(q, SIGKILL);
449 * Also get rid of our orphans.
451 while ((q = LIST_FIRST(&p->p_orphans)) != NULL) {
457 /* Save exit status. */
461 /* Tell the prison that we are gone. */
462 prison_proc_free(p->p_ucred->cr_prison);
466 * Tell the DTrace fasttrap provider about the exit if it
467 * has declared an interest.
469 if (dtrace_fasttrap_exit)
470 dtrace_fasttrap_exit(p);
474 * Notify interested parties of our demise.
476 KNOTE_LOCKED(&p->p_klist, NOTE_EXIT);
479 int reason = CLD_EXITED;
482 else if (WIFSIGNALED(rv))
484 SDT_PROBE(proc, kernel, , exit, reason, 0, 0, 0, 0);
488 * Just delete all entries in the p_klist. At this point we won't
489 * report any more events, and there are nasty race conditions that
490 * can beat us if we don't.
492 knlist_clear(&p->p_klist, 1);
495 * If this is a process with a descriptor, we may not need to deliver
496 * a signal to the parent. proctree_lock is held over
497 * procdesc_exit() to serialize concurrent calls to close() and
501 if (p->p_procdesc == NULL || procdesc_exit(p)) {
504 * Notify parent that we're gone. If parent has the
505 * PS_NOCLDWAIT flag set, or if the handler is set to SIG_IGN,
506 * notify process 1 instead (and hope it will handle this
509 PROC_LOCK(p->p_pptr);
510 mtx_lock(&p->p_pptr->p_sigacts->ps_mtx);
511 if (p->p_pptr->p_sigacts->ps_flag &
512 (PS_NOCLDWAIT | PS_CLDSIGIGN)) {
515 mtx_unlock(&p->p_pptr->p_sigacts->ps_mtx);
518 proc_reparent(p, initproc);
519 p->p_sigparent = SIGCHLD;
520 PROC_LOCK(p->p_pptr);
523 * Notify parent, so in case he was wait(2)ing or
524 * executing waitpid(2) with our pid, he will
529 mtx_unlock(&p->p_pptr->p_sigacts->ps_mtx);
531 if (p->p_pptr == initproc)
532 kern_psignal(p->p_pptr, SIGCHLD);
533 else if (p->p_sigparent != 0) {
534 if (p->p_sigparent == SIGCHLD)
536 else /* LINUX thread */
537 kern_psignal(p->p_pptr, p->p_sigparent);
541 PROC_LOCK(p->p_pptr);
543 sx_xunlock(&proctree_lock);
546 * The state PRS_ZOMBIE prevents other proesses from sending
547 * signal to the process, to avoid memory leak, we free memory
548 * for signal queue at the time when the state is set.
550 sigqueue_flush(&p->p_sigqueue);
551 sigqueue_flush(&td->td_sigqueue);
554 * We have to wait until after acquiring all locks before
555 * changing p_state. We need to avoid all possible context
556 * switches (including ones from blocking on a mutex) while
557 * marked as a zombie. We also have to set the zombie state
558 * before we release the parent process' proc lock to avoid
559 * a lost wakeup. So, we first call wakeup, then we grab the
560 * sched lock, update the state, and release the parent process'
564 cv_broadcast(&p->p_pwait);
565 sched_exit(p->p_pptr, td);
567 p->p_state = PRS_ZOMBIE;
568 PROC_UNLOCK(p->p_pptr);
571 * Hopefully no one will try to deliver a signal to the process this
574 knlist_destroy(&p->p_klist);
577 * Save our children's rusage information in our exit rusage.
579 ruadd(&p->p_ru, &p->p_rux, &p->p_stats->p_cru, &p->p_crux);
582 * Make sure the scheduler takes this thread out of its tables etc.
583 * This will also release this thread's reference to the ucred.
584 * Other thread parts to release include pcb bits and such.
590 #ifndef _SYS_SYSPROTO_H_
599 sys_abort2(struct thread *td, struct abort2_args *uap)
601 struct proc *p = td->td_proc;
607 * Do it right now so we can log either proper call of abort2(), or
608 * note, that invalid argument was passed. 512 is big enough to
609 * handle 16 arguments' descriptions with additional comments.
611 sb = sbuf_new(NULL, NULL, 512, SBUF_FIXEDLEN);
613 sbuf_printf(sb, "%s(pid %d uid %d) aborted: ",
614 p->p_comm, p->p_pid, td->td_ucred->cr_uid);
616 * Since we can't return from abort2(), send SIGKILL in cases, where
617 * abort2() was called improperly
620 /* Prevent from DoSes from user-space. */
621 if (uap->nargs < 0 || uap->nargs > 16)
623 if (uap->nargs > 0) {
624 if (uap->args == NULL)
626 error = copyin(uap->args, uargs, uap->nargs * sizeof(void *));
631 * Limit size of 'reason' string to 128. Will fit even when
632 * maximal number of arguments was chosen to be logged.
634 if (uap->why != NULL) {
635 error = sbuf_copyin(sb, uap->why, 128);
639 sbuf_printf(sb, "(null)");
641 if (uap->nargs > 0) {
642 sbuf_printf(sb, "(");
643 for (i = 0;i < uap->nargs; i++)
644 sbuf_printf(sb, "%s%p", i == 0 ? "" : ", ", uargs[i]);
645 sbuf_printf(sb, ")");
648 * Final stage: arguments were proper, string has been
649 * successfully copied from userspace, and copying pointers
650 * from user-space succeed.
654 if (sig == SIGKILL) {
656 sbuf_printf(sb, " (Reason text inaccessible)");
660 log(LOG_INFO, "%s", sbuf_data(sb));
662 exit1(td, W_EXITCODE(0, sig));
669 * The dirty work is handled by kern_wait().
672 owait(struct thread *td, struct owait_args *uap __unused)
676 error = kern_wait(td, WAIT_ANY, &status, 0, NULL);
678 td->td_retval[1] = status;
681 #endif /* COMPAT_43 */
684 * The dirty work is handled by kern_wait().
687 sys_wait4(struct thread *td, struct wait4_args *uap)
689 struct rusage ru, *rup;
692 if (uap->rusage != NULL)
696 error = kern_wait(td, uap->pid, &status, uap->options, rup);
697 if (uap->status != NULL && error == 0)
698 error = copyout(&status, uap->status, sizeof(status));
699 if (uap->rusage != NULL && error == 0)
700 error = copyout(&ru, uap->rusage, sizeof(struct rusage));
705 sys_wait6(struct thread *td, struct wait6_args *uap)
707 struct __wrusage wru, *wrup;
713 idtype = uap->idtype;
716 if (uap->wrusage != NULL)
721 if (uap->info != NULL) {
723 bzero(sip, sizeof(*sip));
728 * We expect all callers of wait6() to know about WEXITED and
731 error = kern_wait6(td, idtype, id, &status, uap->options, wrup, sip);
733 if (uap->status != NULL && error == 0)
734 error = copyout(&status, uap->status, sizeof(status));
735 if (uap->wrusage != NULL && error == 0)
736 error = copyout(&wru, uap->wrusage, sizeof(wru));
737 if (uap->info != NULL && error == 0)
738 error = copyout(&si, uap->info, sizeof(si));
743 * Reap the remains of a zombie process and optionally return status and
744 * rusage. Asserts and will release both the proctree_lock and the process
745 * lock as part of its work.
748 proc_reap(struct thread *td, struct proc *p, int *status, int options)
752 sx_assert(&proctree_lock, SA_XLOCKED);
753 PROC_LOCK_ASSERT(p, MA_OWNED);
754 PROC_SLOCK_ASSERT(p, MA_OWNED);
755 KASSERT(p->p_state == PRS_ZOMBIE, ("proc_reap: !PRS_ZOMBIE"));
760 td->td_retval[0] = p->p_pid;
762 *status = p->p_xstat; /* convert to int */
763 if (options & WNOWAIT) {
765 * Only poll, returning the status. Caller does not wish to
766 * release the proc struct just yet.
769 sx_xunlock(&proctree_lock);
774 sigqueue_take(p->p_ksi);
779 * If we got the child via a ptrace 'attach', we need to give it back
782 if (p->p_oppid && (t = pfind(p->p_oppid)) != NULL) {
787 pksignal(t, SIGCHLD, p->p_ksi);
789 cv_broadcast(&p->p_pwait);
791 sx_xunlock(&proctree_lock);
796 * Remove other references to this process to ensure we have an
797 * exclusive reference.
799 sx_xlock(&allproc_lock);
800 LIST_REMOVE(p, p_list); /* off zombproc */
801 sx_xunlock(&allproc_lock);
802 LIST_REMOVE(p, p_sibling);
808 if (p->p_procdesc != NULL)
811 sx_xunlock(&proctree_lock);
814 * As a side effect of this lock, we know that all other writes to
815 * this proc are visible now, so no more locking is needed for p.
818 p->p_xstat = 0; /* XXX: why? */
821 ruadd(&q->p_stats->p_cru, &q->p_crux, &p->p_ru, &p->p_rux);
825 * Decrement the count of procs running with this uid.
827 (void)chgproccnt(p->p_ucred->cr_ruidinfo, -1, 0);
830 * Destroy resource accounting information associated with the process.
834 racct_sub(p, RACCT_NPROC, 1);
840 * Free credentials, arguments, and sigacts.
844 pargs_drop(p->p_args);
846 sigacts_free(p->p_sigacts);
850 * Do any thread-system specific cleanups.
855 * Give vm and machine-dependent layer a chance to free anything that
856 * cpu_exit couldn't release while still running in process context.
862 KASSERT(FIRST_THREAD_IN_PROC(p),
863 ("proc_reap: no residual thread!"));
864 uma_zfree(proc_zone, p);
865 sx_xlock(&allproc_lock);
867 sx_xunlock(&allproc_lock);
871 proc_to_reap(struct thread *td, struct proc *p, idtype_t idtype, id_t id,
872 int *status, int options, struct __wrusage *wrusage, siginfo_t *siginfo)
877 sx_assert(&proctree_lock, SA_XLOCKED);
886 if (p->p_pid != (pid_t)id) {
892 if (p->p_pgid != (pid_t)id) {
898 if (p->p_session->s_sid != (pid_t)id) {
904 if (p->p_ucred->cr_uid != (uid_t)id) {
910 if (p->p_ucred->cr_gid != (gid_t)id) {
916 if (p->p_ucred->cr_prison == NULL ||
917 (p->p_ucred->cr_prison->pr_id != (int)id)) {
923 * It seems that the thread structures get zeroed out
924 * at process exit. This makes it impossible to
925 * support P_SETID, P_CID or P_CPUID.
932 if (p_canwait(td, p)) {
937 if (((options & WEXITED) == 0) && (p->p_state == PRS_ZOMBIE)) {
943 * This special case handles a kthread spawned by linux_clone
944 * (see linux_misc.c). The linux_wait4 and linux_waitpid
945 * functions need to be able to distinguish between waiting
946 * on a process and waiting on a thread. It is a thread if
947 * p_sigparent is not SIGCHLD, and the WLINUXCLONE option
948 * signifies we want to wait for threads and not processes.
950 if ((p->p_sigparent != SIGCHLD) ^
951 ((options & WLINUXCLONE) != 0)) {
958 if (siginfo != NULL) {
959 bzero(siginfo, sizeof(*siginfo));
960 siginfo->si_errno = 0;
963 * SUSv4 requires that the si_signo value is always
964 * SIGCHLD. Obey it despite the rfork(2) interface
965 * allows to request other signal for child exit
968 siginfo->si_signo = SIGCHLD;
971 * This is still a rough estimate. We will fix the
972 * cases TRAPPED, STOPPED, and CONTINUED later.
974 if (WCOREDUMP(p->p_xstat))
975 siginfo->si_code = CLD_DUMPED;
976 else if (WIFSIGNALED(p->p_xstat))
977 siginfo->si_code = CLD_KILLED;
979 siginfo->si_code = CLD_EXITED;
981 siginfo->si_pid = p->p_pid;
982 siginfo->si_uid = p->p_ucred->cr_uid;
983 siginfo->si_status = p->p_xstat;
986 * The si_addr field would be useful additional
987 * detail, but apparently the PC value may be lost
988 * when we reach this point. bzero() above sets
989 * siginfo->si_addr to NULL.
994 * There should be no reason to limit resources usage info to
995 * exited processes only. A snapshot about any resources used
996 * by a stopped process may be exactly what is needed.
998 if (wrusage != NULL) {
999 rup = &wrusage->wru_self;
1001 calcru(p, &rup->ru_utime, &rup->ru_stime);
1003 rup = &wrusage->wru_children;
1004 *rup = p->p_stats->p_cru;
1005 calccru(p, &rup->ru_utime, &rup->ru_stime);
1008 if (p->p_state == PRS_ZOMBIE) {
1009 proc_reap(td, p, status, options);
1018 kern_wait(struct thread *td, pid_t pid, int *status, int options,
1019 struct rusage *rusage)
1021 struct __wrusage wru, *wrup;
1027 if (pid == WAIT_ANY) {
1030 } else if (pid == WAIT_MYPGRP) {
1034 id = (id_t)q->p_pgid;
1036 } else if (pid < 0) {
1048 * For backward compatibility we implicitly add flags WEXITED
1049 * and WTRAPPED here.
1051 options |= WEXITED | WTRAPPED;
1052 ret = kern_wait6(td, idtype, id, status, options, wrup, NULL);
1054 *rusage = wru.wru_self;
1059 kern_wait6(struct thread *td, idtype_t idtype, id_t id, int *status,
1060 int options, struct __wrusage *wrusage, siginfo_t *siginfo)
1063 int error, nfound, ret;
1065 AUDIT_ARG_VALUE((int)idtype); /* XXX - This is likely wrong! */
1066 AUDIT_ARG_PID((pid_t)id); /* XXX - This may be wrong! */
1067 AUDIT_ARG_VALUE(options);
1071 if ((pid_t)id == WAIT_MYPGRP && (idtype == P_PID || idtype == P_PGID)) {
1073 id = (id_t)q->p_pgid;
1078 /* If we don't know the option, just return. */
1079 if ((options & ~(WUNTRACED | WNOHANG | WCONTINUED | WNOWAIT |
1080 WEXITED | WTRAPPED | WLINUXCLONE)) != 0)
1082 if ((options & (WEXITED | WUNTRACED | WCONTINUED | WTRAPPED)) == 0) {
1084 * We will be unable to find any matching processes,
1085 * because there are no known events to look for.
1086 * Prefer to return error instead of blocking
1093 if (q->p_flag & P_STATCHILD) {
1095 q->p_flag &= ~P_STATCHILD;
1099 sx_xlock(&proctree_lock);
1100 LIST_FOREACH(p, &q->p_children, p_sibling) {
1101 ret = proc_to_reap(td, p, idtype, id, status, options,
1113 if ((options & WTRAPPED) != 0 &&
1114 (p->p_flag & P_TRACED) != 0 &&
1115 (p->p_flag & (P_STOPPED_TRACE | P_STOPPED_SIG)) != 0 &&
1116 (p->p_suspcount == p->p_numthreads) &&
1117 ((p->p_flag & P_WAITED) == 0)) {
1119 if ((options & WNOWAIT) == 0)
1120 p->p_flag |= P_WAITED;
1121 sx_xunlock(&proctree_lock);
1122 td->td_retval[0] = p->p_pid;
1125 *status = W_STOPCODE(p->p_xstat);
1126 if (siginfo != NULL) {
1127 siginfo->si_status = p->p_xstat;
1128 siginfo->si_code = CLD_TRAPPED;
1130 if ((options & WNOWAIT) == 0) {
1132 sigqueue_take(p->p_ksi);
1139 if ((options & WUNTRACED) != 0 &&
1140 (p->p_flag & P_STOPPED_SIG) != 0 &&
1141 (p->p_suspcount == p->p_numthreads) &&
1142 ((p->p_flag & P_WAITED) == 0)) {
1144 if ((options & WNOWAIT) == 0)
1145 p->p_flag |= P_WAITED;
1146 sx_xunlock(&proctree_lock);
1147 td->td_retval[0] = p->p_pid;
1150 *status = W_STOPCODE(p->p_xstat);
1151 if (siginfo != NULL) {
1152 siginfo->si_status = p->p_xstat;
1153 siginfo->si_code = CLD_STOPPED;
1155 if ((options & WNOWAIT) == 0) {
1157 sigqueue_take(p->p_ksi);
1165 if ((options & WCONTINUED) != 0 &&
1166 (p->p_flag & P_CONTINUED) != 0) {
1167 sx_xunlock(&proctree_lock);
1168 td->td_retval[0] = p->p_pid;
1169 if ((options & WNOWAIT) == 0) {
1170 p->p_flag &= ~P_CONTINUED;
1172 sigqueue_take(p->p_ksi);
1179 if (siginfo != NULL) {
1180 siginfo->si_status = SIGCONT;
1181 siginfo->si_code = CLD_CONTINUED;
1189 * Look in the orphans list too, to allow the parent to
1190 * collect it's child exit status even if child is being
1193 * Debugger detaches from the parent upon successful
1194 * switch-over from parent to child. At this point due to
1195 * re-parenting the parent loses the child to debugger and a
1196 * wait4(2) call would report that it has no children to wait
1197 * for. By maintaining a list of orphans we allow the parent
1198 * to successfully wait until the child becomes a zombie.
1200 LIST_FOREACH(p, &q->p_orphans, p_orphan) {
1201 ret = proc_to_reap(td, p, idtype, id, status, options,
1211 sx_xunlock(&proctree_lock);
1214 if (options & WNOHANG) {
1215 sx_xunlock(&proctree_lock);
1216 td->td_retval[0] = 0;
1220 sx_xunlock(&proctree_lock);
1221 if (q->p_flag & P_STATCHILD) {
1222 q->p_flag &= ~P_STATCHILD;
1225 error = msleep(q, &q->p_mtx, PWAIT | PCATCH, "wait", 0);
1233 * Make process 'parent' the new parent of process 'child'.
1234 * Must be called with an exclusive hold of proctree lock.
1237 proc_reparent(struct proc *child, struct proc *parent)
1240 sx_assert(&proctree_lock, SX_XLOCKED);
1241 PROC_LOCK_ASSERT(child, MA_OWNED);
1242 if (child->p_pptr == parent)
1245 PROC_LOCK(child->p_pptr);
1246 sigqueue_take(child->p_ksi);
1247 PROC_UNLOCK(child->p_pptr);
1248 LIST_REMOVE(child, p_sibling);
1249 LIST_INSERT_HEAD(&parent->p_children, child, p_sibling);
1251 clear_orphan(child);
1252 if (child->p_flag & P_TRACED) {
1253 LIST_INSERT_HEAD(&child->p_pptr->p_orphans, child, p_orphan);
1254 child->p_flag |= P_ORPHAN;
1257 child->p_pptr = parent;