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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)
116 sys_exit(struct exit_args
*uap
)
119 exit1(W_EXITCODE(uap
->rval
, 0));
126 * Death of a lwp or process with optional bells and whistles.
131 sys_extexit(struct extexit_args
*uap
)
136 action
= EXTEXIT_ACTION(uap
->how
);
137 who
= EXTEXIT_WHO(uap
->how
);
139 /* Check parameters before we might perform some action */
152 error
= copyout(&uap
->status
, uap
->addr
, sizeof(uap
->status
));
165 * Be sure only to perform a simple lwp exit if there is at
166 * least one more lwp in the proc, which will call exit1()
167 * later, otherwise the proc will be an UNDEAD and not even a
170 if (curproc
->p_nthreads
> 1) {
174 /* else last lwp in proc: do the real thing */
176 default: /* to help gcc */
178 exit1(W_EXITCODE(uap
->status
, 0));
183 rel_mplock(); /* safety */
187 * Kill all lwps associated with the current process except the
188 * current lwp. Return an error if we race another thread trying to
189 * do the same thing and lose the race.
191 * If forexec is non-zero the current thread and process flags are
192 * cleaned up so they can be reused.
195 killalllwps(int forexec
)
197 struct lwp
*lp
= curthread
->td_lwp
;
198 struct proc
*p
= lp
->lwp_proc
;
201 * Interlock against P_WEXIT. Only one of the process's thread
202 * is allowed to do the master exit.
204 if (p
->p_flag
& P_WEXIT
)
206 p
->p_flag
|= P_WEXIT
;
209 * Interlock with LWP_WEXIT and kill any remaining LWPs
211 lp
->lwp_flag
|= LWP_WEXIT
;
212 if (p
->p_nthreads
> 1)
216 * If doing this for an exec, clean up the remaining thread
217 * (us) for continuing operation after all the other threads
221 lp
->lwp_flag
&= ~LWP_WEXIT
;
222 p
->p_flag
&= ~P_WEXIT
;
228 * Kill all LWPs except the current one. Do not try to signal
229 * LWPs which have exited on their own or have already been
233 killlwps(struct lwp
*lp
)
235 struct proc
*p
= lp
->lwp_proc
;
239 * Kill the remaining LWPs. We must send the signal before setting
240 * LWP_WEXIT. The setting of WEXIT is optional but helps reduce
241 * races. tlp must be held across the call as it might block and
242 * allow the target lwp to rip itself out from under our loop.
244 FOREACH_LWP_IN_PROC(tlp
, p
) {
246 if ((tlp
->lwp_flag
& LWP_WEXIT
) == 0) {
247 lwpsignal(p
, tlp
, SIGKILL
);
248 tlp
->lwp_flag
|= LWP_WEXIT
;
254 * Wait for everything to clear out.
256 while (p
->p_nthreads
> 1) {
257 tsleep(&p
->p_nthreads
, 0, "killlwps", 0);
262 * Exit: deallocate address space and other resources, change proc state
263 * to zombie, and unlink proc from allproc and parent's lists. Save exit
264 * status and rusage for wait(). Check for child processes and orphan them.
269 struct thread
*td
= curthread
;
270 struct proc
*p
= td
->td_proc
;
271 struct lwp
*lp
= td
->td_lwp
;
279 kprintf("init died (signal %d, exit %d)\n",
280 WTERMSIG(rv
), WEXITSTATUS(rv
));
281 panic("Going nowhere without my init!");
284 varsymset_clean(&p
->p_varsymset
);
285 lockuninit(&p
->p_varsymset
.vx_lock
);
287 * Kill all lwps associated with the current process, return an
288 * error if we race another thread trying to do the same thing
291 error
= killalllwps(0);
297 caps_exit(lp
->lwp_thread
);
300 /* are we a task leader? */
301 if (p
== p
->p_leader
) {
302 struct kill_args killArgs
;
303 killArgs
.signum
= SIGKILL
;
306 killArgs
.pid
= q
->p_pid
;
308 * The interface for kill is better
309 * than the internal signal
316 tsleep((caddr_t
)p
, 0, "exit1", 0);
322 STOPEVENT(p
, S_EXIT
, rv
);
323 wakeup(&p
->p_stype
); /* Wakeup anyone in procfs' PIOCWAIT */
326 * Check if any loadable modules need anything done at process exit.
327 * e.g. SYSV IPC stuff
328 * XXX what if one of these generates an error?
330 TAILQ_FOREACH(ep
, &exit_list
, next
)
333 if (p
->p_flag
& P_PROFIL
)
336 * If parent is waiting for us to exit or exec,
337 * P_PPWAIT is set; we will wakeup the parent below.
339 p
->p_flag
&= ~(P_TRACED
| P_PPWAIT
);
340 SIGEMPTYSET(p
->p_siglist
);
341 SIGEMPTYSET(lp
->lwp_siglist
);
342 if (timevalisset(&p
->p_realtimer
.it_value
))
343 callout_stop(&p
->p_ithandle
);
346 * Reset any sigio structures pointing to us as a result of
347 * F_SETOWN with our pid.
349 funsetownlst(&p
->p_sigiolst
);
352 * Close open files and release open-file table.
357 if(p
->p_leader
->p_peers
) {
359 while(q
->p_peers
!= p
)
361 q
->p_peers
= p
->p_peers
;
362 wakeup((caddr_t
)p
->p_leader
);
366 * XXX Shutdown SYSV semaphores
370 KKASSERT(p
->p_numposixlocks
== 0);
372 /* The next two chunks should probably be moved to vmspace_exit. */
376 * Release upcalls associated with this process
382 * Clean up data related to virtual kernel operation. Clean up
383 * any vkernel context related to the current lwp now so we can
387 vkernel_lwp_exit(lp
);
392 * Release user portion of address space.
393 * This releases references to vnodes,
394 * which could cause I/O if the file has been unlinked.
395 * Need to do this early enough that we can still sleep.
396 * Can't free the entire vmspace as the kernel stack
397 * may be mapped within that space also.
399 * Processes sharing the same vmspace may exit in one order, and
400 * get cleaned up by vmspace_exit() in a different order. The
401 * last exiting process to reach this point releases as much of
402 * the environment as it can, and the last process cleaned up
403 * by vmspace_exit() (which decrements exitingcnt) cleans up the
407 sysref_put(&vm
->vm_sysref
);
409 if (SESS_LEADER(p
)) {
410 struct session
*sp
= p
->p_session
;
414 * We are the controlling process. Signal the
415 * foreground process group, drain the controlling
416 * terminal, and revoke access to the controlling
419 * NOTE: while waiting for the process group to exit
420 * it is possible that one of the processes in the
421 * group will revoke the tty, so the ttyclosesession()
422 * function will re-check sp->s_ttyvp.
424 if (sp
->s_ttyp
&& (sp
->s_ttyp
->t_session
== sp
)) {
425 if (sp
->s_ttyp
->t_pgrp
)
426 pgsignal(sp
->s_ttyp
->t_pgrp
, SIGHUP
, 1);
428 ttyclosesession(sp
, 1); /* also revoke */
431 * Release the tty. If someone has it open via
432 * /dev/tty then close it (since they no longer can
433 * once we've NULL'd it out).
435 ttyclosesession(sp
, 0);
438 * s_ttyp is not zero'd; we use this to indicate
439 * that the session once had a controlling terminal.
440 * (for logging and informational purposes)
445 fixjobc(p
, p
->p_pgrp
, 0);
446 (void)acct_process(p
);
452 ktrdestroy(&p
->p_tracenode
);
456 * Release reference to text vnode
458 if ((vtmp
= p
->p_textvp
) != NULL
) {
464 * Move the process to the zombie list. This will block
465 * until the process p_lock count reaches 0. The process will
466 * not be reaped until TDF_EXITING is set by cpu_thread_exit(),
467 * which is called from cpu_proc_exit().
469 proc_move_allproc_zombie(p
);
471 q
= LIST_FIRST(&p
->p_children
);
472 if (q
) /* only need this if any child is S_ZOMB */
473 wakeup((caddr_t
) initproc
);
474 for (; q
!= 0; q
= nq
) {
475 nq
= LIST_NEXT(q
, p_sibling
);
476 LIST_REMOVE(q
, p_sibling
);
477 LIST_INSERT_HEAD(&initproc
->p_children
, q
, p_sibling
);
478 q
->p_pptr
= initproc
;
479 q
->p_sigparent
= SIGCHLD
;
481 * Traced processes are killed
482 * since their existence means someone is screwing up.
484 if (q
->p_flag
& P_TRACED
) {
485 q
->p_flag
&= ~P_TRACED
;
491 * Save exit status and final rusage info, adding in child rusage
492 * info and self times.
495 calcru_proc(p
, &p
->p_ru
);
496 ruadd(&p
->p_ru
, &p
->p_cru
);
499 * notify interested parties of our demise.
501 KNOTE(&p
->p_klist
, NOTE_EXIT
);
504 * Notify parent that we're gone. If parent has the PS_NOCLDWAIT
505 * flag set, notify process 1 instead (and hope it will handle
508 if (p
->p_pptr
->p_sigacts
->ps_flag
& PS_NOCLDWAIT
) {
509 struct proc
*pp
= p
->p_pptr
;
510 proc_reparent(p
, initproc
);
512 * If this was the last child of our parent, notify
513 * parent, so in case he was wait(2)ing, he will
516 if (LIST_EMPTY(&pp
->p_children
))
520 if (p
->p_sigparent
&& p
->p_pptr
!= initproc
) {
521 ksignal(p
->p_pptr
, p
->p_sigparent
);
523 ksignal(p
->p_pptr
, SIGCHLD
);
526 wakeup((caddr_t
)p
->p_pptr
);
528 * cpu_exit is responsible for clearing curproc, since
529 * it is heavily integrated with the thread/switching sequence.
531 * Other substructures are freed from wait().
536 * Release the current user process designation on the process so
537 * the userland scheduler can work in someone else.
539 p
->p_usched
->release_curproc(lp
);
542 * Finally, call machine-dependent code to release as many of the
543 * lwp's resources as we can and halt execution of this thread.
549 * Eventually called by every exiting LWP
552 lwp_exit(int masterexit
)
554 struct thread
*td
= curthread
;
555 struct lwp
*lp
= td
->td_lwp
;
556 struct proc
*p
= lp
->lwp_proc
;
559 * lwp_exit() may be called without setting LWP_WEXIT, so
560 * make sure it is set here.
562 lp
->lwp_flag
|= LWP_WEXIT
;
565 * Clean up any virtualization
568 vkernel_lwp_exit(lp
);
571 * Clean up any syscall-cached ucred
574 crfree(td
->td_ucred
);
579 * Nobody actually wakes us when the lock
580 * count reaches zero, so just wait one tick.
582 while (lp
->lwp_lock
> 0)
583 tsleep(lp
, 0, "lwpexit", 1);
585 /* Hand down resource usage to our proc */
586 ruadd(&p
->p_ru
, &lp
->lwp_ru
);
589 * If we don't hold the process until the LWP is reaped wait*()
590 * may try to dispose of its vmspace before all the LWPs have
591 * actually terminated.
596 * We have to use the reaper for all the LWPs except the one doing
597 * the master exit. The LWP doing the master exit can just be
598 * left on p_lwps and the process reaper will deal with it
599 * synchronously, which is much faster.
601 if (masterexit
== 0) {
602 lwp_rb_tree_RB_REMOVE(&p
->p_lwp_tree
, lp
);
604 wakeup(&p
->p_nthreads
);
605 LIST_INSERT_HEAD(&deadlwp_list
[mycpuid
], lp
, u
.lwp_reap_entry
);
606 taskqueue_enqueue(taskqueue_thread
[mycpuid
], deadlwp_task
[mycpuid
]);
610 biosched_done(curthread
);
615 * Wait until a lwp is completely dead.
617 * If the thread is still executing, which can't be waited upon,
618 * return failure. The caller is responsible of waiting a little
619 * bit and checking again.
622 * while (!lwp_wait(lp))
623 * tsleep(lp, 0, "lwpwait", 1);
626 lwp_wait(struct lwp
*lp
)
628 struct thread
*td
= lp
->lwp_thread
;;
630 KKASSERT(lwkt_preempted_proc() != lp
);
632 while (lp
->lwp_lock
> 0)
633 tsleep(lp
, 0, "lwpwait1", 1);
638 * The lwp's thread may still be in the middle
639 * of switching away, we can't rip its stack out from
640 * under it until TDF_EXITING is set and both
641 * TDF_RUNNING and TDF_PREEMPT_LOCK are clear.
642 * TDF_PREEMPT_LOCK must be checked because TDF_RUNNING
643 * will be cleared temporarily if a thread gets
646 * YYY no wakeup occurs, so we simply return failure
647 * and let the caller deal with sleeping and calling
650 if ((td
->td_flags
& (TDF_RUNNING
|TDF_PREEMPT_LOCK
|TDF_EXITING
)) !=
658 * Release the resources associated with a lwp.
659 * The lwp must be completely dead.
662 lwp_dispose(struct lwp
*lp
)
664 struct thread
*td
= lp
->lwp_thread
;;
666 KKASSERT(lwkt_preempted_proc() != lp
);
667 KKASSERT(td
->td_refs
== 0);
668 KKASSERT((td
->td_flags
& (TDF_RUNNING
|TDF_PREEMPT_LOCK
|TDF_EXITING
)) ==
676 lp
->lwp_thread
= NULL
;
677 lwkt_free_thread(td
);
686 sys_wait4(struct wait_args
*uap
)
688 struct rusage rusage
;
691 error
= kern_wait(uap
->pid
, (uap
->status
? &status
: NULL
),
692 uap
->options
, (uap
->rusage
? &rusage
: NULL
),
693 &uap
->sysmsg_result
);
695 if (error
== 0 && uap
->status
)
696 error
= copyout(&status
, uap
->status
, sizeof(*uap
->status
));
697 if (error
== 0 && uap
->rusage
)
698 error
= copyout(&rusage
, uap
->rusage
, sizeof(*uap
->rusage
));
705 * wait_args(int pid, int *status, int options, struct rusage *rusage)
710 kern_wait(pid_t pid
, int *status
, int options
, struct rusage
*rusage
, int *res
)
712 struct thread
*td
= curthread
;
714 struct proc
*q
= td
->td_proc
;
720 if (options
&~ (WUNTRACED
|WNOHANG
|WCONTINUED
|WLINUXCLONE
))
725 * Hack for backwards compatibility with badly written user code.
726 * Or perhaps we have to do this anyway, it is unclear. XXX
728 * The problem is that if a process group is stopped and the parent
729 * is doing a wait*(..., WUNTRACED, ...), it will see the STOP
730 * of the child and then stop itself when it tries to return from the
731 * system call. When the process group is resumed the parent will
732 * then get the STOP status even though the child has now resumed
733 * (a followup wait*() will get the CONT status).
735 * Previously the CONT would overwrite the STOP because the tstop
736 * was handled within tsleep(), and the parent would only see
737 * the CONT when both are stopped and continued together. This litte
738 * two-line hack restores this effect.
740 while (q
->p_stat
== SSTOP
)
744 LIST_FOREACH(p
, &q
->p_children
, p_sibling
) {
745 if (pid
!= WAIT_ANY
&&
746 p
->p_pid
!= pid
&& p
->p_pgid
!= -pid
)
749 /* This special case handles a kthread spawned by linux_clone
750 * (see linux_misc.c). The linux_wait4 and linux_waitpid
751 * functions need to be able to distinguish between waiting
752 * on a process and waiting on a thread. It is a thread if
753 * p_sigparent is not SIGCHLD, and the WLINUXCLONE option
754 * signifies we want to wait for threads and not processes.
756 if ((p
->p_sigparent
!= SIGCHLD
) ^
757 ((options
& WLINUXCLONE
) != 0)) {
762 if (p
->p_stat
== SZOMB
) {
764 * We may go into SZOMB with threads still present.
765 * We must wait for them to exit before we can reap
766 * the master thread, otherwise we may race reaping
767 * non-master threads.
769 while (p
->p_nthreads
> 0) {
770 tsleep(&p
->p_nthreads
, 0, "lwpzomb", hz
);
774 * Reap any LWPs left in p->p_lwps. This is usually
775 * just the last LWP. This must be done before
776 * we loop on p_lock since the lwps hold a ref on
777 * it as a vmspace interlock.
779 * Once that is accomplished p_nthreads had better
782 while ((lp
= RB_ROOT(&p
->p_lwp_tree
)) != NULL
) {
783 lwp_rb_tree_RB_REMOVE(&p
->p_lwp_tree
, lp
);
786 KKASSERT(p
->p_nthreads
== 0);
789 * Don't do anything really bad until all references
790 * to the process go away. This may include other
791 * LWPs which are still in the process of being
792 * reaped. We can't just pull the rug out from under
793 * them because they may still be using the VM space.
795 * Certain kernel facilities such as /proc will also
796 * put a hold on the process for short periods of
800 tsleep(p
, 0, "reap3", hz
);
802 /* scheduling hook for heuristic */
803 /* XXX no lwp available, we need a different heuristic */
805 p->p_usched->heuristic_exiting(td->td_lwp, deadlp);
808 /* Take care of our return values. */
811 *status
= p
->p_xstat
;
815 * If we got the child via a ptrace 'attach',
816 * we need to give it back to the old parent.
818 if (p
->p_oppid
&& (t
= pfind(p
->p_oppid
))) {
828 * Unlink the proc from its process group so that
829 * the following operations won't lead to an
830 * inconsistent state for processes running down
833 KKASSERT(p
->p_lock
== 0);
834 proc_remove_zombie(p
);
838 ruadd(&q
->p_cru
, &p
->p_ru
);
841 * Decrement the count of procs running with this uid.
843 chgproccnt(p
->p_ucred
->cr_ruidinfo
, -1, 0);
846 * Free up credentials.
852 * Remove unused arguments
854 if (p
->p_args
&& --p
->p_args
->ar_ref
== 0)
855 FREE(p
->p_args
, M_PARGS
);
857 if (--p
->p_sigacts
->ps_refcnt
== 0) {
858 kfree(p
->p_sigacts
, M_SUBPROC
);
868 if (p
->p_stat
== SSTOP
&& (p
->p_flag
& P_WAITED
) == 0 &&
869 (p
->p_flag
& P_TRACED
|| options
& WUNTRACED
)) {
870 p
->p_flag
|= P_WAITED
;
874 *status
= W_STOPCODE(p
->p_xstat
);
875 /* Zero rusage so we get something consistent. */
877 bzero(rusage
, sizeof(rusage
));
881 if (options
& WCONTINUED
&& (p
->p_flag
& P_CONTINUED
)) {
883 p
->p_flag
&= ~P_CONTINUED
;
895 if (options
& WNOHANG
) {
900 error
= tsleep((caddr_t
)q
, PCATCH
, "wait", 0);
910 * make process 'parent' the new parent of process 'child'.
913 proc_reparent(struct proc
*child
, struct proc
*parent
)
916 if (child
->p_pptr
== parent
)
919 LIST_REMOVE(child
, p_sibling
);
920 LIST_INSERT_HEAD(&parent
->p_children
, child
, p_sibling
);
921 child
->p_pptr
= parent
;
925 * The next two functions are to handle adding/deleting items on the
929 * Take the arguments given and put them onto the exit callout list,
930 * However first make sure that it's not already there.
931 * returns 0 on success.
935 at_exit(exitlist_fn function
)
940 /* Be noisy if the programmer has lost track of things */
941 if (rm_at_exit(function
))
942 kprintf("WARNING: exit callout entry (%p) already present\n",
945 ep
= kmalloc(sizeof(*ep
), M_ATEXIT
, M_NOWAIT
);
948 ep
->function
= function
;
949 TAILQ_INSERT_TAIL(&exit_list
, ep
, next
);
954 * Scan the exit callout list for the given item and remove it.
955 * Returns the number of items removed (0 or 1)
958 rm_at_exit(exitlist_fn function
)
962 TAILQ_FOREACH(ep
, &exit_list
, next
) {
963 if (ep
->function
== function
) {
964 TAILQ_REMOVE(&exit_list
, ep
, next
);
973 * LWP reaper related code.
976 reaplwps(void *context
, int dummy
)
978 struct lwplist
*lwplist
= context
;
982 while ((lp
= LIST_FIRST(lwplist
))) {
983 LIST_REMOVE(lp
, u
.lwp_reap_entry
);
990 reaplwp(struct lwp
*lp
)
992 while (lwp_wait(lp
) == 0)
993 tsleep(lp
, 0, "lwpreap", 1);
1002 for (cpu
= 0; cpu
< ncpus
; cpu
++) {
1003 LIST_INIT(&deadlwp_list
[cpu
]);
1004 deadlwp_task
[cpu
] = kmalloc(sizeof(*deadlwp_task
[cpu
]), M_DEVBUF
, M_WAITOK
);
1005 TASK_INIT(deadlwp_task
[cpu
], 0, reaplwps
, &deadlwp_list
[cpu
]);
1009 SYSINIT(deadlwpinit
, SI_SUB_CONFIGURE
, SI_ORDER_ANY
, deadlwp_init
, NULL
);