ff7668079f
proc_reparent() is called but sigqueue_take() is forgotten.
909 lines
23 KiB
C
909 lines
23 KiB
C
/*-
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* Copyright (c) 1982, 1986, 1989, 1991, 1993
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* The Regents of the University of California. All rights reserved.
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* (c) UNIX System Laboratories, Inc.
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* All or some portions of this file are derived from material licensed
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* to the University of California by American Telephone and Telegraph
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* Co. or Unix System Laboratories, Inc. and are reproduced herein with
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* the permission of UNIX System Laboratories, Inc.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* @(#)kern_exit.c 8.7 (Berkeley) 2/12/94
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include "opt_compat.h"
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#include "opt_ktrace.h"
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#include "opt_mac.h"
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/sysproto.h>
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#include <sys/eventhandler.h>
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#include <sys/kernel.h>
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#include <sys/malloc.h>
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#include <sys/lock.h>
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#include <sys/mutex.h>
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#include <sys/proc.h>
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#include <sys/pioctl.h>
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#include <sys/tty.h>
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#include <sys/wait.h>
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#include <sys/vmmeter.h>
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#include <sys/vnode.h>
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#include <sys/resourcevar.h>
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#include <sys/sbuf.h>
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#include <sys/signalvar.h>
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#include <sys/sched.h>
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#include <sys/sx.h>
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#include <sys/syscallsubr.h>
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#include <sys/syslog.h>
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#include <sys/ptrace.h>
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#include <sys/acct.h> /* for acct_process() function prototype */
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#include <sys/filedesc.h>
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#include <sys/shm.h>
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#include <sys/sem.h>
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#ifdef KTRACE
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#include <sys/ktrace.h>
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#endif
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#include <security/audit/audit.h>
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#include <security/mac/mac_framework.h>
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#include <vm/vm.h>
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#include <vm/vm_extern.h>
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#include <vm/vm_param.h>
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#include <vm/pmap.h>
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#include <vm/vm_map.h>
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#include <vm/vm_page.h>
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#include <vm/uma.h>
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/* Required to be non-static for SysVR4 emulator */
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MALLOC_DEFINE(M_ZOMBIE, "zombie", "zombie proc status");
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/* Hook for NFS teardown procedure. */
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void (*nlminfo_release_p)(struct proc *p);
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/*
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* exit --
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* Death of process.
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*
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* MPSAFE
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*/
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void
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sys_exit(struct thread *td, struct sys_exit_args *uap)
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{
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exit1(td, W_EXITCODE(uap->rval, 0));
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/* NOTREACHED */
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}
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/*
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* Exit: deallocate address space and other resources, change proc state
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* to zombie, and unlink proc from allproc and parent's lists. Save exit
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* status and rusage for wait(). Check for child processes and orphan them.
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*/
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void
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exit1(struct thread *td, int rv)
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{
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struct proc *p, *nq, *q;
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struct tty *tp;
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struct vnode *ttyvp;
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struct vnode *vtmp;
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#ifdef KTRACE
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struct vnode *tracevp;
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struct ucred *tracecred;
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#endif
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struct plimit *plim;
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int locked;
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/*
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* Drop Giant if caller has it. Eventually we should warn about
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* being called with Giant held.
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*/
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while (mtx_owned(&Giant))
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mtx_unlock(&Giant);
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p = td->td_proc;
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if (p == initproc) {
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printf("init died (signal %d, exit %d)\n",
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WTERMSIG(rv), WEXITSTATUS(rv));
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panic("Going nowhere without my init!");
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}
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/*
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* MUST abort all other threads before proceeding past here.
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*/
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PROC_LOCK(p);
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if (p->p_flag & P_HADTHREADS) {
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retry:
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/*
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* First check if some other thread got here before us..
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* if so, act apropriatly, (exit or suspend);
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*/
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thread_suspend_check(0);
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/*
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* Kill off the other threads. This requires
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* some co-operation from other parts of the kernel
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* so it may not be instantaneous. With this state set
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* any thread entering the kernel from userspace will
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* thread_exit() in trap(). Any thread attempting to
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* sleep will return immediately with EINTR or EWOULDBLOCK
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* which will hopefully force them to back out to userland
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* freeing resources as they go. Any thread attempting
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* to return to userland will thread_exit() from userret().
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* thread_exit() will unsuspend us when the last of the
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* other threads exits.
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* If there is already a thread singler after resumption,
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* calling thread_single will fail; in that case, we just
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* re-check all suspension request, the thread should
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* either be suspended there or exit.
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*/
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if (thread_single(SINGLE_EXIT))
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goto retry;
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/*
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* All other activity in this process is now stopped.
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* Threading support has been turned off.
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*/
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}
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/*
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* Wakeup anyone in procfs' PIOCWAIT. They should have a hold
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* on our vmspace, so we should block below until they have
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* released their reference to us. Note that if they have
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* requested S_EXIT stops we will block here until they ack
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* via PIOCCONT.
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*/
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_STOPEVENT(p, S_EXIT, rv);
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/*
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* Note that we are exiting and do another wakeup of anyone in
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* PIOCWAIT in case they aren't listening for S_EXIT stops or
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* decided to wait again after we told them we are exiting.
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*/
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p->p_flag |= P_WEXIT;
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wakeup(&p->p_stype);
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/*
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* Wait for any processes that have a hold on our vmspace to
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* release their reference.
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*/
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while (p->p_lock > 0)
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msleep(&p->p_lock, &p->p_mtx, PWAIT, "exithold", 0);
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PROC_UNLOCK(p);
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#ifdef AUDIT
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/*
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* The Sun BSM exit token contains two components: an exit status as
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* passed to exit(), and a return value to indicate what sort of exit
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* it was. The exit status is WEXITSTATUS(rv), but it's not clear
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* what the return value is.
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*/
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AUDIT_ARG(exit, WEXITSTATUS(rv), 0);
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AUDIT_SYSCALL_EXIT(0, td);
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#endif
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/* Are we a task leader? */
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if (p == p->p_leader) {
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mtx_lock(&ppeers_lock);
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q = p->p_peers;
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while (q != NULL) {
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PROC_LOCK(q);
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psignal(q, SIGKILL);
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PROC_UNLOCK(q);
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q = q->p_peers;
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}
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while (p->p_peers != NULL)
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msleep(p, &ppeers_lock, PWAIT, "exit1", 0);
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mtx_unlock(&ppeers_lock);
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}
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/*
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* Check if any loadable modules need anything done at process exit.
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* E.g. SYSV IPC stuff
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* XXX what if one of these generates an error?
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*/
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EVENTHANDLER_INVOKE(process_exit, p);
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MALLOC(p->p_ru, struct rusage *, sizeof(struct rusage),
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M_ZOMBIE, M_WAITOK);
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/*
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* If parent is waiting for us to exit or exec,
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* P_PPWAIT is set; we will wakeup the parent below.
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*/
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PROC_LOCK(p);
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stopprofclock(p);
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p->p_flag &= ~(P_TRACED | P_PPWAIT);
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/*
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* Stop the real interval timer. If the handler is currently
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* executing, prevent it from rearming itself and let it finish.
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*/
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if (timevalisset(&p->p_realtimer.it_value) &&
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callout_stop(&p->p_itcallout) == 0) {
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timevalclear(&p->p_realtimer.it_interval);
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msleep(&p->p_itcallout, &p->p_mtx, PWAIT, "ritwait", 0);
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KASSERT(!timevalisset(&p->p_realtimer.it_value),
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("realtime timer is still armed"));
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}
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PROC_UNLOCK(p);
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/*
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* Reset any sigio structures pointing to us as a result of
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* F_SETOWN with our pid.
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*/
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funsetownlst(&p->p_sigiolst);
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/*
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* If this process has an nlminfo data area (for lockd), release it
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*/
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if (nlminfo_release_p != NULL && p->p_nlminfo != NULL)
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(*nlminfo_release_p)(p);
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/*
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* Close open files and release open-file table.
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* This may block!
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*/
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fdfree(td);
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/*
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* If this thread tickled GEOM, we need to wait for the giggling to
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* stop before we return to userland
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*/
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if (td->td_pflags & TDP_GEOM)
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g_waitidle();
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/*
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* Remove ourself from our leader's peer list and wake our leader.
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*/
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mtx_lock(&ppeers_lock);
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if (p->p_leader->p_peers) {
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q = p->p_leader;
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while (q->p_peers != p)
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q = q->p_peers;
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q->p_peers = p->p_peers;
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wakeup(p->p_leader);
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}
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mtx_unlock(&ppeers_lock);
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vmspace_exit(td);
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mtx_lock(&Giant); /* XXX TTY */
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sx_xlock(&proctree_lock);
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if (SESS_LEADER(p)) {
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struct session *sp;
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sp = p->p_session;
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if (sp->s_ttyvp) {
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/*
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* Controlling process.
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* Signal foreground pgrp,
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* drain controlling terminal
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* and revoke access to controlling terminal.
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*/
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if (sp->s_ttyp && (sp->s_ttyp->t_session == sp)) {
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tp = sp->s_ttyp;
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if (sp->s_ttyp->t_pgrp) {
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PGRP_LOCK(sp->s_ttyp->t_pgrp);
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pgsignal(sp->s_ttyp->t_pgrp, SIGHUP, 1);
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PGRP_UNLOCK(sp->s_ttyp->t_pgrp);
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}
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/* XXX tp should be locked. */
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sx_xunlock(&proctree_lock);
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(void) ttywait(tp);
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sx_xlock(&proctree_lock);
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/*
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* The tty could have been revoked
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* if we blocked.
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*/
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if (sp->s_ttyvp) {
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ttyvp = sp->s_ttyvp;
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SESS_LOCK(p->p_session);
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sp->s_ttyvp = NULL;
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SESS_UNLOCK(p->p_session);
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sx_xunlock(&proctree_lock);
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VOP_LOCK(ttyvp, LK_EXCLUSIVE, td);
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VOP_REVOKE(ttyvp, REVOKEALL);
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vput(ttyvp);
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sx_xlock(&proctree_lock);
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}
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}
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if (sp->s_ttyvp) {
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ttyvp = sp->s_ttyvp;
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SESS_LOCK(p->p_session);
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sp->s_ttyvp = NULL;
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SESS_UNLOCK(p->p_session);
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vrele(ttyvp);
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}
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/*
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* s_ttyp is not zero'd; we use this to indicate
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* that the session once had a controlling terminal.
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* (for logging and informational purposes)
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*/
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}
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SESS_LOCK(p->p_session);
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sp->s_leader = NULL;
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SESS_UNLOCK(p->p_session);
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}
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fixjobc(p, p->p_pgrp, 0);
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sx_xunlock(&proctree_lock);
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(void)acct_process(td);
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mtx_unlock(&Giant);
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#ifdef KTRACE
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/*
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* Drain any pending records on the thread and release the trace
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* file. It might be better if drain-and-clear were atomic.
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*/
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ktrprocexit(td);
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PROC_LOCK(p);
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mtx_lock(&ktrace_mtx);
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p->p_traceflag = 0; /* don't trace the vrele() */
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tracevp = p->p_tracevp;
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p->p_tracevp = NULL;
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tracecred = p->p_tracecred;
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p->p_tracecred = NULL;
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mtx_unlock(&ktrace_mtx);
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PROC_UNLOCK(p);
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if (tracevp != NULL) {
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locked = VFS_LOCK_GIANT(tracevp->v_mount);
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vrele(tracevp);
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VFS_UNLOCK_GIANT(locked);
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}
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if (tracecred != NULL)
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crfree(tracecred);
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#endif
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/*
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* Release reference to text vnode
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*/
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if ((vtmp = p->p_textvp) != NULL) {
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p->p_textvp = NULL;
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locked = VFS_LOCK_GIANT(vtmp->v_mount);
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vrele(vtmp);
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VFS_UNLOCK_GIANT(locked);
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}
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/*
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* Release our limits structure.
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*/
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PROC_LOCK(p);
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plim = p->p_limit;
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p->p_limit = NULL;
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PROC_UNLOCK(p);
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lim_free(plim);
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/*
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* Remove proc from allproc queue and pidhash chain.
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* Place onto zombproc. Unlink from parent's child list.
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*/
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sx_xlock(&allproc_lock);
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LIST_REMOVE(p, p_list);
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LIST_INSERT_HEAD(&zombproc, p, p_list);
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LIST_REMOVE(p, p_hash);
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sx_xunlock(&allproc_lock);
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/*
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* Reparent all of our children to init.
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*/
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sx_xlock(&proctree_lock);
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q = LIST_FIRST(&p->p_children);
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if (q != NULL) /* only need this if any child is S_ZOMB */
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wakeup(initproc);
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for (; q != NULL; q = nq) {
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nq = LIST_NEXT(q, p_sibling);
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PROC_LOCK(q);
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proc_reparent(q, initproc);
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q->p_sigparent = SIGCHLD;
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/*
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* Traced processes are killed
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* since their existence means someone is screwing up.
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*/
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if (q->p_flag & P_TRACED) {
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q->p_flag &= ~(P_TRACED | P_STOPPED_TRACE);
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psignal(q, SIGKILL);
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}
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PROC_UNLOCK(q);
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}
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/*
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* Save exit status and finalize rusage info except for times,
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* adding in child rusage info later when our time is locked.
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*/
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PROC_LOCK(p);
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p->p_xstat = rv;
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p->p_xthread = td;
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p->p_stats->p_ru.ru_nvcsw++;
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*p->p_ru = p->p_stats->p_ru;
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/*
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* Notify interested parties of our demise.
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*/
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KNOTE_LOCKED(&p->p_klist, NOTE_EXIT);
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/*
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* Just delete all entries in the p_klist. At this point we won't
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* report any more events, and there are nasty race conditions that
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* can beat us if we don't.
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*/
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knlist_clear(&p->p_klist, 1);
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/*
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* Notify parent that we're gone. If parent has the PS_NOCLDWAIT
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* flag set, or if the handler is set to SIG_IGN, notify process
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* 1 instead (and hope it will handle this situation).
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*/
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PROC_LOCK(p->p_pptr);
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mtx_lock(&p->p_pptr->p_sigacts->ps_mtx);
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if (p->p_pptr->p_sigacts->ps_flag & (PS_NOCLDWAIT | PS_CLDSIGIGN)) {
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struct proc *pp;
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mtx_unlock(&p->p_pptr->p_sigacts->ps_mtx);
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pp = p->p_pptr;
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PROC_UNLOCK(pp);
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proc_reparent(p, initproc);
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p->p_sigparent = SIGCHLD;
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PROC_LOCK(p->p_pptr);
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/*
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* If this was the last child of our parent, notify
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* parent, so in case he was wait(2)ing, he will
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* continue.
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*/
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if (LIST_EMPTY(&pp->p_children))
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wakeup(pp);
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} else
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mtx_unlock(&p->p_pptr->p_sigacts->ps_mtx);
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if (p->p_pptr == initproc)
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psignal(p->p_pptr, SIGCHLD);
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else if (p->p_sigparent != 0) {
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if (p->p_sigparent == SIGCHLD)
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childproc_exited(p);
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else /* LINUX thread */
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psignal(p->p_pptr, p->p_sigparent);
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}
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PROC_UNLOCK(p->p_pptr);
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PROC_UNLOCK(p);
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/*
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* Finally, call machine-dependent code to release the remaining
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* resources including address space.
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* The address space is released by "vmspace_exitfree(p)" in
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* vm_waitproc().
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*/
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cpu_exit(td);
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WITNESS_WARN(WARN_PANIC, &proctree_lock.sx_object,
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|
"process (pid %d) exiting", p->p_pid);
|
|
|
|
PROC_LOCK(p);
|
|
PROC_LOCK(p->p_pptr);
|
|
sx_xunlock(&proctree_lock);
|
|
|
|
/*
|
|
* The state PRS_ZOMBIE prevents other proesses from sending
|
|
* signal to the process, to avoid memory leak, we free memory
|
|
* for signal queue at the time when the state is set.
|
|
*/
|
|
sigqueue_flush(&p->p_sigqueue);
|
|
sigqueue_flush(&td->td_sigqueue);
|
|
|
|
/*
|
|
* We have to wait until after acquiring all locks before
|
|
* changing p_state. We need to avoid all possible context
|
|
* switches (including ones from blocking on a mutex) while
|
|
* marked as a zombie. We also have to set the zombie state
|
|
* before we release the parent process' proc lock to avoid
|
|
* a lost wakeup. So, we first call wakeup, then we grab the
|
|
* sched lock, update the state, and release the parent process'
|
|
* proc lock.
|
|
*/
|
|
wakeup(p->p_pptr);
|
|
mtx_lock_spin(&sched_lock);
|
|
p->p_state = PRS_ZOMBIE;
|
|
PROC_UNLOCK(p->p_pptr);
|
|
|
|
sched_exit(p->p_pptr, td);
|
|
|
|
/*
|
|
* Hopefully no one will try to deliver a signal to the process this
|
|
* late in the game.
|
|
*/
|
|
knlist_destroy(&p->p_klist);
|
|
|
|
/*
|
|
* Make sure the scheduler takes this thread out of its tables etc.
|
|
* This will also release this thread's reference to the ucred.
|
|
* Other thread parts to release include pcb bits and such.
|
|
*/
|
|
thread_exit();
|
|
}
|
|
|
|
|
|
#ifndef _SYS_SYSPROTO_H_
|
|
struct abort2_args {
|
|
char *why;
|
|
int nargs;
|
|
void **args;
|
|
};
|
|
#endif
|
|
|
|
/*
|
|
* MPSAFE.
|
|
*/
|
|
int
|
|
abort2(struct thread *td, struct abort2_args *uap)
|
|
{
|
|
struct proc *p = td->td_proc;
|
|
struct sbuf *sb;
|
|
void *uargs[16];
|
|
int error, i, sig;
|
|
|
|
error = 0; /* satisfy compiler */
|
|
|
|
/*
|
|
* Do it right now so we can log either proper call of abort2(), or
|
|
* note, that invalid argument was passed. 512 is big enough to
|
|
* handle 16 arguments' descriptions with additional comments.
|
|
*/
|
|
sb = sbuf_new(NULL, NULL, 512, SBUF_FIXEDLEN);
|
|
sbuf_clear(sb);
|
|
sbuf_printf(sb, "%s(pid %d uid %d) aborted: ",
|
|
p->p_comm, p->p_pid, td->td_ucred->cr_uid);
|
|
/*
|
|
* Since we can't return from abort2(), send SIGKILL in cases, where
|
|
* abort2() was called improperly
|
|
*/
|
|
sig = SIGKILL;
|
|
/* Prevent from DoSes from user-space. */
|
|
if (uap->nargs < 0 || uap->nargs > 16)
|
|
goto out;
|
|
if (uap->args == NULL)
|
|
goto out;
|
|
error = copyin(uap->args, uargs, uap->nargs * sizeof(void *));
|
|
if (error != 0)
|
|
goto out;
|
|
/*
|
|
* Limit size of 'reason' string to 128. Will fit even when
|
|
* maximal number of arguments was chosen to be logged.
|
|
*/
|
|
if (uap->why != NULL) {
|
|
error = sbuf_copyin(sb, uap->why, 128);
|
|
if (error < 0)
|
|
goto out;
|
|
} else {
|
|
sbuf_printf(sb, "(null)");
|
|
}
|
|
if (uap->nargs) {
|
|
sbuf_printf(sb, "(");
|
|
for (i = 0;i < uap->nargs; i++)
|
|
sbuf_printf(sb, "%s%p", i == 0 ? "" : ", ", uargs[i]);
|
|
sbuf_printf(sb, ")");
|
|
}
|
|
/*
|
|
* Final stage: arguments were proper, string has been
|
|
* successfully copied from userspace, and copying pointers
|
|
* from user-space succeed.
|
|
*/
|
|
sig = SIGABRT;
|
|
out:
|
|
if (sig == SIGKILL) {
|
|
sbuf_trim(sb);
|
|
sbuf_printf(sb, " (Reason text inaccessible)");
|
|
}
|
|
sbuf_cat(sb, "\n");
|
|
sbuf_finish(sb);
|
|
log(LOG_INFO, "%s", sbuf_data(sb));
|
|
sbuf_delete(sb);
|
|
exit1(td, W_EXITCODE(0, sig));
|
|
return (0);
|
|
}
|
|
|
|
|
|
#ifdef COMPAT_43
|
|
/*
|
|
* The dirty work is handled by kern_wait().
|
|
*
|
|
* MPSAFE.
|
|
*/
|
|
int
|
|
owait(struct thread *td, struct owait_args *uap __unused)
|
|
{
|
|
int error, status;
|
|
|
|
error = kern_wait(td, WAIT_ANY, &status, 0, NULL);
|
|
if (error == 0)
|
|
td->td_retval[1] = status;
|
|
return (error);
|
|
}
|
|
#endif /* COMPAT_43 */
|
|
|
|
/*
|
|
* The dirty work is handled by kern_wait().
|
|
*
|
|
* MPSAFE.
|
|
*/
|
|
int
|
|
wait4(struct thread *td, struct wait_args *uap)
|
|
{
|
|
struct rusage ru, *rup;
|
|
int error, status;
|
|
|
|
if (uap->rusage != NULL)
|
|
rup = &ru;
|
|
else
|
|
rup = NULL;
|
|
error = kern_wait(td, uap->pid, &status, uap->options, rup);
|
|
if (uap->status != NULL && error == 0)
|
|
error = copyout(&status, uap->status, sizeof(status));
|
|
if (uap->rusage != NULL && error == 0)
|
|
error = copyout(&ru, uap->rusage, sizeof(struct rusage));
|
|
return (error);
|
|
}
|
|
|
|
int
|
|
kern_wait(struct thread *td, pid_t pid, int *status, int options,
|
|
struct rusage *rusage)
|
|
{
|
|
struct proc *p, *q, *t;
|
|
int error, nfound;
|
|
|
|
AUDIT_ARG(pid, pid);
|
|
|
|
q = td->td_proc;
|
|
if (pid == 0) {
|
|
PROC_LOCK(q);
|
|
pid = -q->p_pgid;
|
|
PROC_UNLOCK(q);
|
|
}
|
|
if (options &~ (WUNTRACED|WNOHANG|WCONTINUED|WLINUXCLONE))
|
|
return (EINVAL);
|
|
loop:
|
|
if (q->p_flag & P_STATCHILD) {
|
|
PROC_LOCK(q);
|
|
q->p_flag &= ~P_STATCHILD;
|
|
PROC_UNLOCK(q);
|
|
}
|
|
nfound = 0;
|
|
sx_xlock(&proctree_lock);
|
|
LIST_FOREACH(p, &q->p_children, p_sibling) {
|
|
PROC_LOCK(p);
|
|
if (pid != WAIT_ANY &&
|
|
p->p_pid != pid && p->p_pgid != -pid) {
|
|
PROC_UNLOCK(p);
|
|
continue;
|
|
}
|
|
if (p_canwait(td, p)) {
|
|
PROC_UNLOCK(p);
|
|
continue;
|
|
}
|
|
|
|
/*
|
|
* This special case handles a kthread spawned by linux_clone
|
|
* (see linux_misc.c). The linux_wait4 and linux_waitpid
|
|
* functions need to be able to distinguish between waiting
|
|
* on a process and waiting on a thread. It is a thread if
|
|
* p_sigparent is not SIGCHLD, and the WLINUXCLONE option
|
|
* signifies we want to wait for threads and not processes.
|
|
*/
|
|
if ((p->p_sigparent != SIGCHLD) ^
|
|
((options & WLINUXCLONE) != 0)) {
|
|
PROC_UNLOCK(p);
|
|
continue;
|
|
}
|
|
|
|
nfound++;
|
|
if (p->p_state == PRS_ZOMBIE) {
|
|
|
|
/*
|
|
* It is possible that the last thread of this
|
|
* process is still running on another CPU
|
|
* in thread_exit() after having dropped the process
|
|
* lock via PROC_UNLOCK() but before it has completed
|
|
* cpu_throw(). In that case, the other thread must
|
|
* still hold sched_lock, so simply by acquiring
|
|
* sched_lock once we will wait long enough for the
|
|
* thread to exit in that case.
|
|
*/
|
|
mtx_lock_spin(&sched_lock);
|
|
mtx_unlock_spin(&sched_lock);
|
|
|
|
td->td_retval[0] = p->p_pid;
|
|
if (status)
|
|
*status = p->p_xstat; /* convert to int */
|
|
if (rusage) {
|
|
*rusage = *p->p_ru;
|
|
calcru(p, &rusage->ru_utime, &rusage->ru_stime);
|
|
}
|
|
|
|
PROC_LOCK(q);
|
|
sigqueue_take(p->p_ksi);
|
|
PROC_UNLOCK(q);
|
|
|
|
/*
|
|
* If we got the child via a ptrace 'attach',
|
|
* we need to give it back to the old parent.
|
|
*/
|
|
PROC_UNLOCK(p);
|
|
if (p->p_oppid && (t = pfind(p->p_oppid)) != NULL) {
|
|
PROC_LOCK(p);
|
|
p->p_oppid = 0;
|
|
proc_reparent(p, t);
|
|
PROC_UNLOCK(p);
|
|
tdsignal(t, NULL, SIGCHLD, p->p_ksi);
|
|
wakeup(t);
|
|
PROC_UNLOCK(t);
|
|
sx_xunlock(&proctree_lock);
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Remove other references to this process to ensure
|
|
* we have an exclusive reference.
|
|
*/
|
|
sx_xlock(&allproc_lock);
|
|
LIST_REMOVE(p, p_list); /* off zombproc */
|
|
sx_xunlock(&allproc_lock);
|
|
LIST_REMOVE(p, p_sibling);
|
|
leavepgrp(p);
|
|
sx_xunlock(&proctree_lock);
|
|
|
|
/*
|
|
* As a side effect of this lock, we know that
|
|
* all other writes to this proc are visible now, so
|
|
* no more locking is needed for p.
|
|
*/
|
|
PROC_LOCK(p);
|
|
p->p_xstat = 0; /* XXX: why? */
|
|
PROC_UNLOCK(p);
|
|
PROC_LOCK(q);
|
|
ruadd(&q->p_stats->p_cru, &q->p_crux, p->p_ru,
|
|
&p->p_rux);
|
|
PROC_UNLOCK(q);
|
|
FREE(p->p_ru, M_ZOMBIE);
|
|
p->p_ru = NULL;
|
|
|
|
/*
|
|
* Decrement the count of procs running with this uid.
|
|
*/
|
|
(void)chgproccnt(p->p_ucred->cr_ruidinfo, -1, 0);
|
|
|
|
/*
|
|
* Free credentials, arguments, and sigacts.
|
|
*/
|
|
crfree(p->p_ucred);
|
|
p->p_ucred = NULL;
|
|
pargs_drop(p->p_args);
|
|
p->p_args = NULL;
|
|
sigacts_free(p->p_sigacts);
|
|
p->p_sigacts = NULL;
|
|
|
|
/*
|
|
* Do any thread-system specific cleanups.
|
|
*/
|
|
thread_wait(p);
|
|
|
|
/*
|
|
* Give vm and machine-dependent layer a chance
|
|
* to free anything that cpu_exit couldn't
|
|
* release while still running in process context.
|
|
*/
|
|
vm_waitproc(p);
|
|
#ifdef MAC
|
|
mac_destroy_proc(p);
|
|
#endif
|
|
#ifdef AUDIT
|
|
audit_proc_free(p);
|
|
#endif
|
|
KASSERT(FIRST_THREAD_IN_PROC(p),
|
|
("kern_wait: no residual thread!"));
|
|
uma_zfree(proc_zone, p);
|
|
sx_xlock(&allproc_lock);
|
|
nprocs--;
|
|
sx_xunlock(&allproc_lock);
|
|
return (0);
|
|
}
|
|
mtx_lock_spin(&sched_lock);
|
|
if ((p->p_flag & P_STOPPED_SIG) &&
|
|
(p->p_suspcount == p->p_numthreads) &&
|
|
(p->p_flag & P_WAITED) == 0 &&
|
|
(p->p_flag & P_TRACED || options & WUNTRACED)) {
|
|
mtx_unlock_spin(&sched_lock);
|
|
p->p_flag |= P_WAITED;
|
|
sx_xunlock(&proctree_lock);
|
|
td->td_retval[0] = p->p_pid;
|
|
if (status)
|
|
*status = W_STOPCODE(p->p_xstat);
|
|
|
|
PROC_LOCK(q);
|
|
sigqueue_take(p->p_ksi);
|
|
PROC_UNLOCK(q);
|
|
PROC_UNLOCK(p);
|
|
|
|
return (0);
|
|
}
|
|
mtx_unlock_spin(&sched_lock);
|
|
if (options & WCONTINUED && (p->p_flag & P_CONTINUED)) {
|
|
sx_xunlock(&proctree_lock);
|
|
td->td_retval[0] = p->p_pid;
|
|
p->p_flag &= ~P_CONTINUED;
|
|
|
|
PROC_LOCK(q);
|
|
sigqueue_take(p->p_ksi);
|
|
PROC_UNLOCK(q);
|
|
PROC_UNLOCK(p);
|
|
|
|
if (status)
|
|
*status = SIGCONT;
|
|
return (0);
|
|
}
|
|
PROC_UNLOCK(p);
|
|
}
|
|
if (nfound == 0) {
|
|
sx_xunlock(&proctree_lock);
|
|
return (ECHILD);
|
|
}
|
|
if (options & WNOHANG) {
|
|
sx_xunlock(&proctree_lock);
|
|
td->td_retval[0] = 0;
|
|
return (0);
|
|
}
|
|
PROC_LOCK(q);
|
|
sx_xunlock(&proctree_lock);
|
|
if (q->p_flag & P_STATCHILD) {
|
|
q->p_flag &= ~P_STATCHILD;
|
|
error = 0;
|
|
} else
|
|
error = msleep(q, &q->p_mtx, PWAIT | PCATCH, "wait", 0);
|
|
PROC_UNLOCK(q);
|
|
if (error)
|
|
return (error);
|
|
goto loop;
|
|
}
|
|
|
|
/*
|
|
* Make process 'parent' the new parent of process 'child'.
|
|
* Must be called with an exclusive hold of proctree lock.
|
|
*/
|
|
void
|
|
proc_reparent(struct proc *child, struct proc *parent)
|
|
{
|
|
|
|
sx_assert(&proctree_lock, SX_XLOCKED);
|
|
PROC_LOCK_ASSERT(child, MA_OWNED);
|
|
if (child->p_pptr == parent)
|
|
return;
|
|
|
|
PROC_LOCK(child->p_pptr);
|
|
sigqueue_take(child->p_ksi);
|
|
PROC_UNLOCK(child->p_pptr);
|
|
LIST_REMOVE(child, p_sibling);
|
|
LIST_INSERT_HEAD(&parent->p_children, child, p_sibling);
|
|
child->p_pptr = parent;
|
|
}
|