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5 * All or some portions of this file are derived from material licensed
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38 * @(#)kern_exit.c 8.7 (Berkeley) 2/12/94
39 * $FreeBSD: src/sys/kern/kern_exit.c,v 1.92.2.11 2003/01/13 22:51:16 dillon Exp $
40 * $DragonFly: src/sys/kern/kern_exit.c,v 1.91 2008/05/18 20:02:02 nth Exp $
43 #include "opt_compat.h"
44 #include "opt_ktrace.h"
46 #include <sys/param.h>
47 #include <sys/systm.h>
48 #include <sys/sysproto.h>
49 #include <sys/kernel.h>
50 #include <sys/malloc.h>
52 #include <sys/ktrace.h>
53 #include <sys/pioctl.h>
56 #include <sys/vnode.h>
57 #include <sys/resourcevar.h>
58 #include <sys/signalvar.h>
59 #include <sys/taskqueue.h>
60 #include <sys/ptrace.h>
61 #include <sys/acct.h> /* for acct_process() function prototype */
62 #include <sys/filedesc.h>
67 #include <sys/kern_syscall.h>
68 #include <sys/upcall.h>
70 #include <sys/unistd.h>
73 #include <vm/vm_param.h>
76 #include <vm/vm_map.h>
77 #include <vm/vm_extern.h>
80 #include <sys/thread2.h>
81 #include <sys/sysref2.h>
83 static void reaplwps(void *context
, int dummy
);
84 static void reaplwp(struct lwp
*lp
);
85 static void killlwps(struct lwp
*lp
);
87 static MALLOC_DEFINE(M_ATEXIT
, "atexit", "atexit callback");
88 static MALLOC_DEFINE(M_ZOMBIE
, "zombie", "zombie proc status");
91 * callout list for things to do at exit time
95 TAILQ_ENTRY(exitlist
) next
;
98 TAILQ_HEAD(exit_list_head
, exitlist
);
99 static struct exit_list_head exit_list
= TAILQ_HEAD_INITIALIZER(exit_list
);
104 struct task
*deadlwp_task
[MAXCPU
];
105 struct lwplist deadlwp_list
[MAXCPU
];
111 * SYS_EXIT_ARGS(int rval)
114 sys_exit(struct exit_args
*uap
)
116 exit1(W_EXITCODE(uap
->rval
, 0));
122 * Death of a lwp or process with optional bells and whistles.
125 sys_extexit(struct extexit_args
*uap
)
130 action
= EXTEXIT_ACTION(uap
->how
);
131 who
= EXTEXIT_WHO(uap
->how
);
133 /* Check parameters before we might perform some action */
148 error
= copyout(&uap
->status
, uap
->addr
, sizeof(uap
->status
));
160 * Be sure only to perform a simple lwp exit if there is at
161 * least one more lwp in the proc, which will call exit1()
162 * later, otherwise the proc will be an UNDEAD and not even a
165 if (curproc
->p_nthreads
> 1) {
169 /* else last lwp in proc: do the real thing */
172 default: /* to help gcc */
174 exit1(W_EXITCODE(uap
->status
, 0));
182 * Kill all lwps associated with the current process except the
183 * current lwp. Return an error if we race another thread trying to
184 * do the same thing and lose the race.
186 * If forexec is non-zero the current thread and process flags are
187 * cleaned up so they can be reused.
190 killalllwps(int forexec
)
192 struct lwp
*lp
= curthread
->td_lwp
;
193 struct proc
*p
= lp
->lwp_proc
;
196 * Interlock against P_WEXIT. Only one of the process's thread
197 * is allowed to do the master exit.
199 if (p
->p_flag
& P_WEXIT
)
201 p
->p_flag
|= P_WEXIT
;
204 * Interlock with LWP_WEXIT and kill any remaining LWPs
206 lp
->lwp_flag
|= LWP_WEXIT
;
207 if (p
->p_nthreads
> 1)
211 * If doing this for an exec, clean up the remaining thread
212 * (us) for continuing operation after all the other threads
216 lp
->lwp_flag
&= ~LWP_WEXIT
;
217 p
->p_flag
&= ~P_WEXIT
;
223 * Kill all LWPs except the current one. Do not try to signal
224 * LWPs which have exited on their own or have already been
228 killlwps(struct lwp
*lp
)
230 struct proc
*p
= lp
->lwp_proc
;
234 * Kill the remaining LWPs. We must send the signal before setting
235 * LWP_WEXIT. The setting of WEXIT is optional but helps reduce
236 * races. tlp must be held across the call as it might block and
237 * allow the target lwp to rip itself out from under our loop.
239 FOREACH_LWP_IN_PROC(tlp
, p
) {
241 if ((tlp
->lwp_flag
& LWP_WEXIT
) == 0) {
242 lwpsignal(p
, tlp
, SIGKILL
);
243 tlp
->lwp_flag
|= LWP_WEXIT
;
249 * Wait for everything to clear out.
251 while (p
->p_nthreads
> 1) {
253 kprintf("killlwps: waiting for %d lwps of pid "
255 p
->p_nthreads
- 1, p
->p_pid
);
256 tsleep(&p
->p_nthreads
, 0, "killlwps", hz
);
261 * Exit: deallocate address space and other resources, change proc state
262 * to zombie, and unlink proc from allproc and parent's lists. Save exit
263 * status and rusage for wait(). Check for child processes and orphan them.
268 struct thread
*td
= curthread
;
269 struct proc
*p
= td
->td_proc
;
270 struct lwp
*lp
= td
->td_lwp
;
278 kprintf("init died (signal %d, exit %d)\n",
279 WTERMSIG(rv
), WEXITSTATUS(rv
));
280 panic("Going nowhere without my init!");
284 * Kill all lwps associated with the current process, return an
285 * error if we race another thread trying to do the same thing
288 error
= killalllwps(0);
294 caps_exit(lp
->lwp_thread
);
297 /* are we a task leader? */
298 if (p
== p
->p_leader
) {
299 struct kill_args killArgs
;
300 killArgs
.signum
= SIGKILL
;
303 killArgs
.pid
= q
->p_pid
;
305 * The interface for kill is better
306 * than the internal signal
313 tsleep((caddr_t
)p
, 0, "exit1", 0);
319 STOPEVENT(p
, S_EXIT
, rv
);
320 wakeup(&p
->p_stype
); /* Wakeup anyone in procfs' PIOCWAIT */
323 * Check if any loadable modules need anything done at process exit.
324 * e.g. SYSV IPC stuff
325 * XXX what if one of these generates an error?
327 TAILQ_FOREACH(ep
, &exit_list
, next
)
330 if (p
->p_flag
& P_PROFIL
)
333 * If parent is waiting for us to exit or exec,
334 * P_PPWAIT is set; we will wakeup the parent below.
336 p
->p_flag
&= ~(P_TRACED
| P_PPWAIT
);
337 SIGEMPTYSET(p
->p_siglist
);
338 SIGEMPTYSET(lp
->lwp_siglist
);
339 if (timevalisset(&p
->p_realtimer
.it_value
))
340 callout_stop(&p
->p_ithandle
);
343 * Reset any sigio structures pointing to us as a result of
344 * F_SETOWN with our pid.
346 funsetownlst(&p
->p_sigiolst
);
349 * Close open files and release open-file table.
355 if(p
->p_leader
->p_peers
) {
357 while(q
->p_peers
!= p
)
359 q
->p_peers
= p
->p_peers
;
360 wakeup((caddr_t
)p
->p_leader
);
364 * XXX Shutdown SYSV semaphores
368 KKASSERT(p
->p_numposixlocks
== 0);
370 /* The next two chunks should probably be moved to vmspace_exit. */
374 * Release upcalls associated with this process
380 * Clean up data related to virtual kernel operation. Clean up
381 * any vkernel context related to the current lwp now so we can
385 vkernel_lwp_exit(lp
);
390 * Release user portion of address space.
391 * This releases references to vnodes,
392 * which could cause I/O if the file has been unlinked.
393 * Need to do this early enough that we can still sleep.
394 * Can't free the entire vmspace as the kernel stack
395 * may be mapped within that space also.
397 * Processes sharing the same vmspace may exit in one order, and
398 * get cleaned up by vmspace_exit() in a different order. The
399 * last exiting process to reach this point releases as much of
400 * the environment as it can, and the last process cleaned up
401 * by vmspace_exit() (which decrements exitingcnt) cleans up the
405 sysref_put(&vm
->vm_sysref
);
407 if (SESS_LEADER(p
)) {
408 struct session
*sp
= p
->p_session
;
412 * We are the controlling process. Signal the
413 * foreground process group, drain the controlling
414 * terminal, and revoke access to the controlling
417 * NOTE: while waiting for the process group to exit
418 * it is possible that one of the processes in the
419 * group will revoke the tty, so the ttyclosesession()
420 * function will re-check sp->s_ttyvp.
422 if (sp
->s_ttyp
&& (sp
->s_ttyp
->t_session
== sp
)) {
423 if (sp
->s_ttyp
->t_pgrp
)
424 pgsignal(sp
->s_ttyp
->t_pgrp
, SIGHUP
, 1);
426 ttyclosesession(sp
, 1); /* also revoke */
429 * Release the tty. If someone has it open via
430 * /dev/tty then close it (since they no longer can
431 * once we've NULL'd it out).
433 ttyclosesession(sp
, 0);
436 * s_ttyp is not zero'd; we use this to indicate
437 * that the session once had a controlling terminal.
438 * (for logging and informational purposes)
443 fixjobc(p
, p
->p_pgrp
, 0);
444 (void)acct_process(p
);
450 ktrdestroy(&p
->p_tracenode
);
454 * Release reference to text vnode
456 if ((vtmp
= p
->p_textvp
) != NULL
) {
462 * Move the process to the zombie list. This will block
463 * until the process p_lock count reaches 0. The process will
464 * not be reaped until TDF_EXITING is set by cpu_thread_exit(),
465 * which is called from cpu_proc_exit().
467 proc_move_allproc_zombie(p
);
469 q
= LIST_FIRST(&p
->p_children
);
470 if (q
) /* only need this if any child is S_ZOMB */
471 wakeup((caddr_t
) initproc
);
472 for (; q
!= 0; q
= nq
) {
473 nq
= LIST_NEXT(q
, p_sibling
);
474 LIST_REMOVE(q
, p_sibling
);
475 LIST_INSERT_HEAD(&initproc
->p_children
, q
, p_sibling
);
476 q
->p_pptr
= initproc
;
477 q
->p_sigparent
= SIGCHLD
;
479 * Traced processes are killed
480 * since their existence means someone is screwing up.
482 if (q
->p_flag
& P_TRACED
) {
483 q
->p_flag
&= ~P_TRACED
;
489 * Save exit status and final rusage info, adding in child rusage
490 * info and self times.
493 calcru_proc(p
, &p
->p_ru
);
494 ruadd(&p
->p_ru
, &p
->p_cru
);
497 * notify interested parties of our demise.
499 KNOTE(&p
->p_klist
, NOTE_EXIT
);
502 * Notify parent that we're gone. If parent has the PS_NOCLDWAIT
503 * flag set, notify process 1 instead (and hope it will handle
506 if (p
->p_pptr
->p_sigacts
->ps_flag
& PS_NOCLDWAIT
) {
507 struct proc
*pp
= p
->p_pptr
;
508 proc_reparent(p
, initproc
);
510 * If this was the last child of our parent, notify
511 * parent, so in case he was wait(2)ing, he will
514 if (LIST_EMPTY(&pp
->p_children
))
518 if (p
->p_sigparent
&& p
->p_pptr
!= initproc
) {
519 ksignal(p
->p_pptr
, p
->p_sigparent
);
521 ksignal(p
->p_pptr
, SIGCHLD
);
524 wakeup((caddr_t
)p
->p_pptr
);
526 * cpu_exit is responsible for clearing curproc, since
527 * it is heavily integrated with the thread/switching sequence.
529 * Other substructures are freed from wait().
534 * Release the current user process designation on the process so
535 * the userland scheduler can work in someone else.
537 p
->p_usched
->release_curproc(lp
);
540 * Finally, call machine-dependent code to release as many of the
541 * lwp's resources as we can and halt execution of this thread.
547 lwp_exit(int masterexit
)
549 struct lwp
*lp
= curthread
->td_lwp
;
550 struct proc
*p
= lp
->lwp_proc
;
553 * lwp_exit() may be called without setting LWP_WEXIT, so
554 * make sure it is set here.
556 lp
->lwp_flag
|= LWP_WEXIT
;
559 * Clean up any virtualization
562 vkernel_lwp_exit(lp
);
565 * Nobody actually wakes us when the lock
566 * count reaches zero, so just wait one tick.
568 while (lp
->lwp_lock
> 0)
569 tsleep(lp
, 0, "lwpexit", 1);
571 /* Hand down resource usage to our proc */
572 ruadd(&p
->p_ru
, &lp
->lwp_ru
);
575 * If we don't hold the process until the LWP is reaped wait*()
576 * may try to dispose of its vmspace before all the LWPs have
577 * actually terminated.
582 * We have to use the reaper for all the LWPs except the one doing
583 * the master exit. The LWP doing the master exit can just be
584 * left on p_lwps and the process reaper will deal with it
585 * synchronously, which is much faster.
587 if (masterexit
== 0) {
588 lwp_rb_tree_RB_REMOVE(&p
->p_lwp_tree
, lp
);
590 wakeup(&p
->p_nthreads
);
591 LIST_INSERT_HEAD(&deadlwp_list
[mycpuid
], lp
, u
.lwp_reap_entry
);
592 taskqueue_enqueue(taskqueue_thread
[mycpuid
], deadlwp_task
[mycpuid
]);
600 * Wait until a lwp is completely dead.
602 * If the thread is still executing, which can't be waited upon,
603 * return failure. The caller is responsible of waiting a little
604 * bit and checking again.
607 * while (!lwp_wait(lp))
608 * tsleep(lp, 0, "lwpwait", 1);
611 lwp_wait(struct lwp
*lp
)
613 struct thread
*td
= lp
->lwp_thread
;;
615 KKASSERT(lwkt_preempted_proc() != lp
);
617 while (lp
->lwp_lock
> 0)
618 tsleep(lp
, 0, "lwpwait1", 1);
623 * The lwp's thread may still be in the middle
624 * of switching away, we can't rip its stack out from
625 * under it until TDF_EXITING is set and both
626 * TDF_RUNNING and TDF_PREEMPT_LOCK are clear.
627 * TDF_PREEMPT_LOCK must be checked because TDF_RUNNING
628 * will be cleared temporarily if a thread gets
631 * YYY no wakeup occurs, so we simply return failure
632 * and let the caller deal with sleeping and calling
635 if ((td
->td_flags
& (TDF_RUNNING
|TDF_PREEMPT_LOCK
|TDF_EXITING
)) !=
643 * Release the resources associated with a lwp.
644 * The lwp must be completely dead.
647 lwp_dispose(struct lwp
*lp
)
649 struct thread
*td
= lp
->lwp_thread
;;
651 KKASSERT(lwkt_preempted_proc() != lp
);
652 KKASSERT(td
->td_refs
== 0);
653 KKASSERT((td
->td_flags
& (TDF_RUNNING
|TDF_PREEMPT_LOCK
|TDF_EXITING
)) ==
661 lp
->lwp_thread
= NULL
;
662 lwkt_free_thread(td
);
668 sys_wait4(struct wait_args
*uap
)
670 struct rusage rusage
;
673 error
= kern_wait(uap
->pid
, uap
->status
? &status
: NULL
,
674 uap
->options
, uap
->rusage
? &rusage
: NULL
, &uap
->sysmsg_fds
[0]);
676 if (error
== 0 && uap
->status
)
677 error
= copyout(&status
, uap
->status
, sizeof(*uap
->status
));
678 if (error
== 0 && uap
->rusage
)
679 error
= copyout(&rusage
, uap
->rusage
, sizeof(*uap
->rusage
));
686 * wait_args(int pid, int *status, int options, struct rusage *rusage)
689 kern_wait(pid_t pid
, int *status
, int options
, struct rusage
*rusage
, int *res
)
691 struct thread
*td
= curthread
;
693 struct proc
*q
= td
->td_proc
;
699 if (options
&~ (WUNTRACED
|WNOHANG
|WCONTINUED
|WLINUXCLONE
))
703 * Hack for backwards compatibility with badly written user code.
704 * Or perhaps we have to do this anyway, it is unclear. XXX
706 * The problem is that if a process group is stopped and the parent
707 * is doing a wait*(..., WUNTRACED, ...), it will see the STOP
708 * of the child and then stop itself when it tries to return from the
709 * system call. When the process group is resumed the parent will
710 * then get the STOP status even though the child has now resumed
711 * (a followup wait*() will get the CONT status).
713 * Previously the CONT would overwrite the STOP because the tstop
714 * was handled within tsleep(), and the parent would only see
715 * the CONT when both are stopped and continued together. This litte
716 * two-line hack restores this effect.
718 while (q
->p_stat
== SSTOP
)
722 LIST_FOREACH(p
, &q
->p_children
, p_sibling
) {
723 if (pid
!= WAIT_ANY
&&
724 p
->p_pid
!= pid
&& p
->p_pgid
!= -pid
)
727 /* This special case handles a kthread spawned by linux_clone
728 * (see linux_misc.c). The linux_wait4 and linux_waitpid
729 * functions need to be able to distinguish between waiting
730 * on a process and waiting on a thread. It is a thread if
731 * p_sigparent is not SIGCHLD, and the WLINUXCLONE option
732 * signifies we want to wait for threads and not processes.
734 if ((p
->p_sigparent
!= SIGCHLD
) ^
735 ((options
& WLINUXCLONE
) != 0)) {
740 if (p
->p_stat
== SZOMB
) {
742 * We may go into SZOMB with threads still present.
743 * We must wait for them to exit before we can reap
744 * the master thread, otherwise we may race reaping
745 * non-master threads.
747 while (p
->p_nthreads
> 0) {
748 tsleep(&p
->p_nthreads
, 0, "lwpzomb", hz
);
752 * Reap any LWPs left in p->p_lwps. This is usually
753 * just the last LWP. This must be done before
754 * we loop on p_lock since the lwps hold a ref on
755 * it as a vmspace interlock.
757 * Once that is accomplished p_nthreads had better
760 while ((lp
= RB_ROOT(&p
->p_lwp_tree
)) != NULL
) {
761 lwp_rb_tree_RB_REMOVE(&p
->p_lwp_tree
, lp
);
764 KKASSERT(p
->p_nthreads
== 0);
767 * Don't do anything really bad until all references
768 * to the process go away. This may include other
769 * LWPs which are still in the process of being
770 * reaped. We can't just pull the rug out from under
771 * them because they may still be using the VM space.
773 * Certain kernel facilities such as /proc will also
774 * put a hold on the process for short periods of
778 tsleep(p
, 0, "reap3", hz
);
780 /* scheduling hook for heuristic */
781 /* XXX no lwp available, we need a different heuristic */
783 p->p_usched->heuristic_exiting(td->td_lwp, deadlp);
786 /* Take care of our return values. */
789 *status
= p
->p_xstat
;
793 * If we got the child via a ptrace 'attach',
794 * we need to give it back to the old parent.
796 if (p
->p_oppid
&& (t
= pfind(p
->p_oppid
))) {
805 * Unlink the proc from its process group so that
806 * the following operations won't lead to an
807 * inconsistent state for processes running down
810 KKASSERT(p
->p_lock
== 0);
811 proc_remove_zombie(p
);
815 ruadd(&q
->p_cru
, &p
->p_ru
);
818 * Decrement the count of procs running with this uid.
820 chgproccnt(p
->p_ucred
->cr_ruidinfo
, -1, 0);
823 * Free up credentials.
829 * Remove unused arguments
831 if (p
->p_args
&& --p
->p_args
->ar_ref
== 0)
832 FREE(p
->p_args
, M_PARGS
);
834 if (--p
->p_sigacts
->ps_refcnt
== 0) {
835 kfree(p
->p_sigacts
, M_SUBPROC
);
844 if (p
->p_stat
== SSTOP
&& (p
->p_flag
& P_WAITED
) == 0 &&
845 (p
->p_flag
& P_TRACED
|| options
& WUNTRACED
)) {
846 p
->p_flag
|= P_WAITED
;
850 *status
= W_STOPCODE(p
->p_xstat
);
851 /* Zero rusage so we get something consistent. */
853 bzero(rusage
, sizeof(rusage
));
856 if (options
& WCONTINUED
&& (p
->p_flag
& P_CONTINUED
)) {
858 p
->p_flag
&= ~P_CONTINUED
;
867 if (options
& WNOHANG
) {
871 error
= tsleep((caddr_t
)q
, PCATCH
, "wait", 0);
878 * make process 'parent' the new parent of process 'child'.
881 proc_reparent(struct proc
*child
, struct proc
*parent
)
884 if (child
->p_pptr
== parent
)
887 LIST_REMOVE(child
, p_sibling
);
888 LIST_INSERT_HEAD(&parent
->p_children
, child
, p_sibling
);
889 child
->p_pptr
= parent
;
893 * The next two functions are to handle adding/deleting items on the
897 * Take the arguments given and put them onto the exit callout list,
898 * However first make sure that it's not already there.
899 * returns 0 on success.
903 at_exit(exitlist_fn function
)
908 /* Be noisy if the programmer has lost track of things */
909 if (rm_at_exit(function
))
910 kprintf("WARNING: exit callout entry (%p) already present\n",
913 ep
= kmalloc(sizeof(*ep
), M_ATEXIT
, M_NOWAIT
);
916 ep
->function
= function
;
917 TAILQ_INSERT_TAIL(&exit_list
, ep
, next
);
922 * Scan the exit callout list for the given item and remove it.
923 * Returns the number of items removed (0 or 1)
926 rm_at_exit(exitlist_fn function
)
930 TAILQ_FOREACH(ep
, &exit_list
, next
) {
931 if (ep
->function
== function
) {
932 TAILQ_REMOVE(&exit_list
, ep
, next
);
941 * LWP reaper related code.
944 reaplwps(void *context
, int dummy
)
946 struct lwplist
*lwplist
= context
;
949 while ((lp
= LIST_FIRST(lwplist
))) {
950 LIST_REMOVE(lp
, u
.lwp_reap_entry
);
956 reaplwp(struct lwp
*lp
)
958 while (lwp_wait(lp
) == 0)
959 tsleep(lp
, 0, "lwpreap", 1);
968 for (cpu
= 0; cpu
< ncpus
; cpu
++) {
969 LIST_INIT(&deadlwp_list
[cpu
]);
970 deadlwp_task
[cpu
] = kmalloc(sizeof(*deadlwp_task
[cpu
]), M_DEVBUF
, M_WAITOK
);
971 TASK_INIT(deadlwp_task
[cpu
], 0, reaplwps
, &deadlwp_list
[cpu
]);
975 SYSINIT(deadlwpinit
, SI_SUB_CONFIGURE
, SI_ORDER_ANY
, deadlwp_init
, NULL
);