Processes stay in the hash until they get reaped. This code does not unlink the child from the parent, so remove the claim that it does. Sponsored by: The FreeBSD Foundation
1361 lines
34 KiB
C
1361 lines
34 KiB
C
/*-
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* SPDX-License-Identifier: BSD-3-Clause
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*
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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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* 3. 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_ktrace.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/capsicum.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/procdesc.h>
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#include <sys/pioctl.h>
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#include <sys/jail.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/racct.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/sdt.h>
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#include <sys/shm.h>
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#include <sys/sem.h>
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#include <sys/umtx.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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#ifdef KDTRACE_HOOKS
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#include <sys/dtrace_bsd.h>
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dtrace_execexit_func_t dtrace_fasttrap_exit;
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#endif
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SDT_PROVIDER_DECLARE(proc);
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SDT_PROBE_DEFINE1(proc, , , exit, "int");
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/* Hook for NFS teardown procedure. */
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void (*nlminfo_release_p)(struct proc *p);
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EVENTHANDLER_LIST_DECLARE(process_exit);
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struct proc *
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proc_realparent(struct proc *child)
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{
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struct proc *p, *parent;
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sx_assert(&proctree_lock, SX_LOCKED);
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if ((child->p_treeflag & P_TREE_ORPHANED) == 0)
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return (child->p_pptr->p_pid == child->p_oppid ?
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child->p_pptr : initproc);
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for (p = child; (p->p_treeflag & P_TREE_FIRST_ORPHAN) == 0;) {
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/* Cannot use LIST_PREV(), since the list head is not known. */
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p = __containerof(p->p_orphan.le_prev, struct proc,
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p_orphan.le_next);
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KASSERT((p->p_treeflag & P_TREE_ORPHANED) != 0,
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("missing P_ORPHAN %p", p));
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}
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parent = __containerof(p->p_orphan.le_prev, struct proc,
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p_orphans.lh_first);
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return (parent);
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}
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void
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reaper_abandon_children(struct proc *p, bool exiting)
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{
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struct proc *p1, *p2, *ptmp;
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sx_assert(&proctree_lock, SX_LOCKED);
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KASSERT(p != initproc, ("reaper_abandon_children for initproc"));
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if ((p->p_treeflag & P_TREE_REAPER) == 0)
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return;
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p1 = p->p_reaper;
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LIST_FOREACH_SAFE(p2, &p->p_reaplist, p_reapsibling, ptmp) {
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LIST_REMOVE(p2, p_reapsibling);
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p2->p_reaper = p1;
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p2->p_reapsubtree = p->p_reapsubtree;
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LIST_INSERT_HEAD(&p1->p_reaplist, p2, p_reapsibling);
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if (exiting && p2->p_pptr == p) {
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PROC_LOCK(p2);
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proc_reparent(p2, p1, true);
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PROC_UNLOCK(p2);
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}
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}
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KASSERT(LIST_EMPTY(&p->p_reaplist), ("p_reaplist not empty"));
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p->p_treeflag &= ~P_TREE_REAPER;
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}
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static void
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clear_orphan(struct proc *p)
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{
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struct proc *p1;
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sx_assert(&proctree_lock, SA_XLOCKED);
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if ((p->p_treeflag & P_TREE_ORPHANED) == 0)
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return;
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if ((p->p_treeflag & P_TREE_FIRST_ORPHAN) != 0) {
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p1 = LIST_NEXT(p, p_orphan);
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if (p1 != NULL)
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p1->p_treeflag |= P_TREE_FIRST_ORPHAN;
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p->p_treeflag &= ~P_TREE_FIRST_ORPHAN;
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}
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LIST_REMOVE(p, p_orphan);
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p->p_treeflag &= ~P_TREE_ORPHANED;
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}
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/*
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* exit -- death of process.
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*/
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void
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sys_sys_exit(struct thread *td, struct sys_exit_args *uap)
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{
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exit1(td, 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 to
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* zombie, and unlink proc from allproc and parent's lists. Save exit status
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* 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 rval, int signo)
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{
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struct proc *p, *nq, *q, *t;
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struct thread *tdt;
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ksiginfo_t *ksi, *ksi1;
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int signal_parent;
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mtx_assert(&Giant, MA_NOTOWNED);
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KASSERT(rval == 0 || signo == 0, ("exit1 rv %d sig %d", rval, signo));
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p = td->td_proc;
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/*
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* XXX in case we're rebooting we just let init die in order to
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* work around an unsolved stack overflow seen very late during
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* shutdown on sparc64 when the gmirror worker process exists.
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*/
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if (p == initproc && rebooting == 0) {
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printf("init died (signal %d, exit %d)\n", signo, rval);
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panic("Going nowhere without my init!");
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}
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/*
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* Deref SU mp, since the thread does not return to userspace.
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*/
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td_softdep_cleanup(td);
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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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/*
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* First check if some other thread or external request got
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* here before us. If so, act appropriately: exit or suspend.
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* We must ensure that stop requests are handled before we set
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* P_WEXIT.
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*/
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thread_suspend_check(0);
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while (p->p_flag & P_HADTHREADS) {
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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(p, SINGLE_EXIT))
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/*
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* All other activity in this process is now
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* stopped. Threading support has been turned
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* off.
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*/
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break;
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/*
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* Recheck for new stop or suspend requests which
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* might appear while process lock was dropped in
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* thread_single().
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*/
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thread_suspend_check(0);
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}
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KASSERT(p->p_numthreads == 1,
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("exit1: proc %p exiting with %d threads", p, p->p_numthreads));
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racct_sub(p, RACCT_NTHR, 1);
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/* Let event handler change exit status */
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p->p_xexit = rval;
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p->p_xsig = signo;
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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, 0);
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/*
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* Ignore any pending request to stop due to a stop signal.
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* Once P_WEXIT is set, future requests will be ignored as
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* well.
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*/
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p->p_flag &= ~P_STOPPED_SIG;
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KASSERT(!P_SHOULDSTOP(p), ("exiting process is stopped"));
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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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/* Drain the limit callout while we don't have the proc locked */
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callout_drain(&p->p_limco);
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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(rval, 0);
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AUDIT_SYSCALL_EXIT(0, td);
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#endif
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/* Are we a task leader with peers? */
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if (p->p_peers != NULL && 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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kern_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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* Event handler could change exit status.
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* XXX what if one of these generates an error?
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*/
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EVENTHANDLER_DIRECT_INVOKE(process_exit, p);
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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 | P_PPTRACE);
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p->p_ptevents = 0;
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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_safe(&p->p_itcallout, CS_EXECUTING, NULL) == 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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umtx_thread_exit(td);
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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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/*
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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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/*
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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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fdescfree(td);
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|
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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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/*
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* Remove ourself from our leader's peer list and wake our leader.
|
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*/
|
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if (p->p_leader->p_peers != NULL) {
|
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mtx_lock(&ppeers_lock);
|
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if (p->p_leader->p_peers != NULL) {
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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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}
|
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|
|
vmspace_exit(td);
|
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killjobc();
|
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(void)acct_process(td);
|
|
|
|
#ifdef KTRACE
|
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ktrprocexit(td);
|
|
#endif
|
|
/*
|
|
* Release reference to text vnode
|
|
*/
|
|
if (p->p_textvp != NULL) {
|
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vrele(p->p_textvp);
|
|
p->p_textvp = NULL;
|
|
}
|
|
|
|
/*
|
|
* Release our limits structure.
|
|
*/
|
|
lim_free(p->p_limit);
|
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p->p_limit = NULL;
|
|
|
|
tidhash_remove(td);
|
|
|
|
/*
|
|
* Call machine-dependent code to release any
|
|
* machine-dependent resources other than the address space.
|
|
* The address space is released by "vmspace_exitfree(p)" in
|
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* vm_waitproc().
|
|
*/
|
|
cpu_exit(td);
|
|
|
|
WITNESS_WARN(WARN_PANIC, NULL, "process (pid %d) exiting", p->p_pid);
|
|
|
|
sx_xlock(&proctree_lock);
|
|
/*
|
|
* Move proc from allproc queue to zombproc.
|
|
*/
|
|
sx_xlock(&allproc_lock);
|
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LIST_REMOVE(p, p_list);
|
|
LIST_INSERT_HEAD(&zombproc, p, p_list);
|
|
sx_xunlock(&allproc_lock);
|
|
|
|
/*
|
|
* Reparent all children processes:
|
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* - traced ones to the original parent (or init if we are that parent)
|
|
* - the rest to init
|
|
*/
|
|
q = LIST_FIRST(&p->p_children);
|
|
if (q != NULL) /* only need this if any child is S_ZOMB */
|
|
wakeup(q->p_reaper);
|
|
for (; q != NULL; q = nq) {
|
|
nq = LIST_NEXT(q, p_sibling);
|
|
ksi = ksiginfo_alloc(TRUE);
|
|
PROC_LOCK(q);
|
|
q->p_sigparent = SIGCHLD;
|
|
|
|
if (!(q->p_flag & P_TRACED)) {
|
|
proc_reparent(q, q->p_reaper, true);
|
|
if (q->p_state == PRS_ZOMBIE) {
|
|
/*
|
|
* Inform reaper about the reparented
|
|
* zombie, since wait(2) has something
|
|
* new to report. Guarantee queueing
|
|
* of the SIGCHLD signal, similar to
|
|
* the _exit() behaviour, by providing
|
|
* our ksiginfo. Ksi is freed by the
|
|
* signal delivery.
|
|
*/
|
|
if (q->p_ksi == NULL) {
|
|
ksi1 = NULL;
|
|
} else {
|
|
ksiginfo_copy(q->p_ksi, ksi);
|
|
ksi->ksi_flags |= KSI_INS;
|
|
ksi1 = ksi;
|
|
ksi = NULL;
|
|
}
|
|
PROC_LOCK(q->p_reaper);
|
|
pksignal(q->p_reaper, SIGCHLD, ksi1);
|
|
PROC_UNLOCK(q->p_reaper);
|
|
} else if (q->p_pdeathsig > 0) {
|
|
/*
|
|
* The child asked to received a signal
|
|
* when we exit.
|
|
*/
|
|
kern_psignal(q, q->p_pdeathsig);
|
|
}
|
|
} else {
|
|
/*
|
|
* Traced processes are killed since their existence
|
|
* means someone is screwing up.
|
|
*/
|
|
t = proc_realparent(q);
|
|
if (t == p) {
|
|
proc_reparent(q, q->p_reaper, true);
|
|
} else {
|
|
PROC_LOCK(t);
|
|
proc_reparent(q, t, true);
|
|
PROC_UNLOCK(t);
|
|
}
|
|
/*
|
|
* Since q was found on our children list, the
|
|
* proc_reparent() call moved q to the orphan
|
|
* list due to present P_TRACED flag. Clear
|
|
* orphan link for q now while q is locked.
|
|
*/
|
|
clear_orphan(q);
|
|
q->p_flag &= ~(P_TRACED | P_STOPPED_TRACE);
|
|
q->p_flag2 &= ~P2_PTRACE_FSTP;
|
|
q->p_ptevents = 0;
|
|
FOREACH_THREAD_IN_PROC(q, tdt) {
|
|
tdt->td_dbgflags &= ~(TDB_SUSPEND | TDB_XSIG |
|
|
TDB_FSTP);
|
|
}
|
|
kern_psignal(q, SIGKILL);
|
|
}
|
|
PROC_UNLOCK(q);
|
|
if (ksi != NULL)
|
|
ksiginfo_free(ksi);
|
|
}
|
|
|
|
/*
|
|
* Also get rid of our orphans.
|
|
*/
|
|
while ((q = LIST_FIRST(&p->p_orphans)) != NULL) {
|
|
PROC_LOCK(q);
|
|
/*
|
|
* If we are the real parent of this process
|
|
* but it has been reparented to a debugger, then
|
|
* check if it asked for a signal when we exit.
|
|
*/
|
|
if (q->p_pdeathsig > 0)
|
|
kern_psignal(q, q->p_pdeathsig);
|
|
CTR2(KTR_PTRACE, "exit: pid %d, clearing orphan %d", p->p_pid,
|
|
q->p_pid);
|
|
clear_orphan(q);
|
|
PROC_UNLOCK(q);
|
|
}
|
|
|
|
/* Save exit status. */
|
|
PROC_LOCK(p);
|
|
p->p_xthread = td;
|
|
|
|
#ifdef KDTRACE_HOOKS
|
|
/*
|
|
* Tell the DTrace fasttrap provider about the exit if it
|
|
* has declared an interest.
|
|
*/
|
|
if (dtrace_fasttrap_exit)
|
|
dtrace_fasttrap_exit(p);
|
|
#endif
|
|
|
|
/*
|
|
* Notify interested parties of our demise.
|
|
*/
|
|
KNOTE_LOCKED(p->p_klist, NOTE_EXIT);
|
|
|
|
#ifdef KDTRACE_HOOKS
|
|
int reason = CLD_EXITED;
|
|
if (WCOREDUMP(signo))
|
|
reason = CLD_DUMPED;
|
|
else if (WIFSIGNALED(signo))
|
|
reason = CLD_KILLED;
|
|
SDT_PROBE1(proc, , , exit, reason);
|
|
#endif
|
|
|
|
/*
|
|
* If this is a process with a descriptor, we may not need to deliver
|
|
* a signal to the parent. proctree_lock is held over
|
|
* procdesc_exit() to serialize concurrent calls to close() and
|
|
* exit().
|
|
*/
|
|
signal_parent = 0;
|
|
if (p->p_procdesc == NULL || procdesc_exit(p)) {
|
|
/*
|
|
* Notify parent that we're gone. If parent has the
|
|
* PS_NOCLDWAIT flag set, or if the handler is set to SIG_IGN,
|
|
* notify process 1 instead (and hope it will handle this
|
|
* situation).
|
|
*/
|
|
PROC_LOCK(p->p_pptr);
|
|
mtx_lock(&p->p_pptr->p_sigacts->ps_mtx);
|
|
if (p->p_pptr->p_sigacts->ps_flag &
|
|
(PS_NOCLDWAIT | PS_CLDSIGIGN)) {
|
|
struct proc *pp;
|
|
|
|
mtx_unlock(&p->p_pptr->p_sigacts->ps_mtx);
|
|
pp = p->p_pptr;
|
|
PROC_UNLOCK(pp);
|
|
proc_reparent(p, p->p_reaper, true);
|
|
p->p_sigparent = SIGCHLD;
|
|
PROC_LOCK(p->p_pptr);
|
|
|
|
/*
|
|
* Notify parent, so in case he was wait(2)ing or
|
|
* executing waitpid(2) with our pid, he will
|
|
* continue.
|
|
*/
|
|
wakeup(pp);
|
|
} else
|
|
mtx_unlock(&p->p_pptr->p_sigacts->ps_mtx);
|
|
|
|
if (p->p_pptr == p->p_reaper || p->p_pptr == initproc) {
|
|
signal_parent = 1;
|
|
} else if (p->p_sigparent != 0) {
|
|
if (p->p_sigparent == SIGCHLD) {
|
|
signal_parent = 1;
|
|
} else { /* LINUX thread */
|
|
signal_parent = 2;
|
|
}
|
|
}
|
|
} else
|
|
PROC_LOCK(p->p_pptr);
|
|
sx_xunlock(&proctree_lock);
|
|
|
|
if (signal_parent == 1) {
|
|
childproc_exited(p);
|
|
} else if (signal_parent == 2) {
|
|
kern_psignal(p->p_pptr, p->p_sigparent);
|
|
}
|
|
|
|
/* Tell the prison that we are gone. */
|
|
prison_proc_free(p->p_ucred->cr_prison);
|
|
|
|
/*
|
|
* 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);
|
|
cv_broadcast(&p->p_pwait);
|
|
sched_exit(p->p_pptr, td);
|
|
PROC_SLOCK(p);
|
|
p->p_state = PRS_ZOMBIE;
|
|
PROC_UNLOCK(p->p_pptr);
|
|
|
|
/*
|
|
* Save our children's rusage information in our exit rusage.
|
|
*/
|
|
PROC_STATLOCK(p);
|
|
ruadd(&p->p_ru, &p->p_rux, &p->p_stats->p_cru, &p->p_crux);
|
|
PROC_STATUNLOCK(p);
|
|
|
|
/*
|
|
* 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
|
|
|
|
int
|
|
sys_abort2(struct thread *td, struct abort2_args *uap)
|
|
{
|
|
struct proc *p = td->td_proc;
|
|
struct sbuf *sb;
|
|
void *uargs[16];
|
|
int error, i, sig;
|
|
|
|
/*
|
|
* 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->nargs > 0) {
|
|
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 > 0) {
|
|
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, 0, sig);
|
|
return (0);
|
|
}
|
|
|
|
|
|
#ifdef COMPAT_43
|
|
/*
|
|
* The dirty work is handled by kern_wait().
|
|
*/
|
|
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().
|
|
*/
|
|
int
|
|
sys_wait4(struct thread *td, struct wait4_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 && td->td_retval[0] != 0)
|
|
error = copyout(&status, uap->status, sizeof(status));
|
|
if (uap->rusage != NULL && error == 0 && td->td_retval[0] != 0)
|
|
error = copyout(&ru, uap->rusage, sizeof(struct rusage));
|
|
return (error);
|
|
}
|
|
|
|
int
|
|
sys_wait6(struct thread *td, struct wait6_args *uap)
|
|
{
|
|
struct __wrusage wru, *wrup;
|
|
siginfo_t si, *sip;
|
|
idtype_t idtype;
|
|
id_t id;
|
|
int error, status;
|
|
|
|
idtype = uap->idtype;
|
|
id = uap->id;
|
|
|
|
if (uap->wrusage != NULL)
|
|
wrup = &wru;
|
|
else
|
|
wrup = NULL;
|
|
|
|
if (uap->info != NULL) {
|
|
sip = &si;
|
|
bzero(sip, sizeof(*sip));
|
|
} else
|
|
sip = NULL;
|
|
|
|
/*
|
|
* We expect all callers of wait6() to know about WEXITED and
|
|
* WTRAPPED.
|
|
*/
|
|
error = kern_wait6(td, idtype, id, &status, uap->options, wrup, sip);
|
|
|
|
if (uap->status != NULL && error == 0 && td->td_retval[0] != 0)
|
|
error = copyout(&status, uap->status, sizeof(status));
|
|
if (uap->wrusage != NULL && error == 0 && td->td_retval[0] != 0)
|
|
error = copyout(&wru, uap->wrusage, sizeof(wru));
|
|
if (uap->info != NULL && error == 0)
|
|
error = copyout(&si, uap->info, sizeof(si));
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* Reap the remains of a zombie process and optionally return status and
|
|
* rusage. Asserts and will release both the proctree_lock and the process
|
|
* lock as part of its work.
|
|
*/
|
|
void
|
|
proc_reap(struct thread *td, struct proc *p, int *status, int options)
|
|
{
|
|
struct proc *q, *t;
|
|
|
|
sx_assert(&proctree_lock, SA_XLOCKED);
|
|
PROC_LOCK_ASSERT(p, MA_OWNED);
|
|
KASSERT(p->p_state == PRS_ZOMBIE, ("proc_reap: !PRS_ZOMBIE"));
|
|
|
|
mtx_spin_wait_unlocked(&p->p_slock);
|
|
|
|
q = td->td_proc;
|
|
|
|
if (status)
|
|
*status = KW_EXITCODE(p->p_xexit, p->p_xsig);
|
|
if (options & WNOWAIT) {
|
|
/*
|
|
* Only poll, returning the status. Caller does not wish to
|
|
* release the proc struct just yet.
|
|
*/
|
|
PROC_UNLOCK(p);
|
|
sx_xunlock(&proctree_lock);
|
|
return;
|
|
}
|
|
|
|
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.
|
|
*/
|
|
if (p->p_oppid != p->p_pptr->p_pid) {
|
|
PROC_UNLOCK(p);
|
|
t = proc_realparent(p);
|
|
PROC_LOCK(t);
|
|
PROC_LOCK(p);
|
|
CTR2(KTR_PTRACE,
|
|
"wait: traced child %d moved back to parent %d", p->p_pid,
|
|
t->p_pid);
|
|
proc_reparent(p, t, false);
|
|
PROC_UNLOCK(p);
|
|
pksignal(t, SIGCHLD, p->p_ksi);
|
|
wakeup(t);
|
|
cv_broadcast(&p->p_pwait);
|
|
PROC_UNLOCK(t);
|
|
sx_xunlock(&proctree_lock);
|
|
return;
|
|
}
|
|
PROC_UNLOCK(p);
|
|
|
|
/*
|
|
* 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);
|
|
sx_xlock(PIDHASHLOCK(p->p_pid));
|
|
LIST_REMOVE(p, p_hash);
|
|
sx_xunlock(PIDHASHLOCK(p->p_pid));
|
|
LIST_REMOVE(p, p_sibling);
|
|
reaper_abandon_children(p, true);
|
|
LIST_REMOVE(p, p_reapsibling);
|
|
PROC_LOCK(p);
|
|
clear_orphan(p);
|
|
PROC_UNLOCK(p);
|
|
leavepgrp(p);
|
|
if (p->p_procdesc != NULL)
|
|
procdesc_reap(p);
|
|
sx_xunlock(&proctree_lock);
|
|
|
|
PROC_LOCK(p);
|
|
knlist_detach(p->p_klist);
|
|
p->p_klist = NULL;
|
|
PROC_UNLOCK(p);
|
|
|
|
/*
|
|
* Removal from allproc list and process group list paired with
|
|
* PROC_LOCK which was executed during that time should guarantee
|
|
* nothing can reach this process anymore. As such further locking
|
|
* is unnecessary.
|
|
*/
|
|
p->p_xexit = p->p_xsig = 0; /* XXX: why? */
|
|
|
|
PROC_LOCK(q);
|
|
ruadd(&q->p_stats->p_cru, &q->p_crux, &p->p_ru, &p->p_rux);
|
|
PROC_UNLOCK(q);
|
|
|
|
/*
|
|
* Decrement the count of procs running with this uid.
|
|
*/
|
|
(void)chgproccnt(p->p_ucred->cr_ruidinfo, -1, 0);
|
|
|
|
/*
|
|
* Destroy resource accounting information associated with the process.
|
|
*/
|
|
#ifdef RACCT
|
|
if (racct_enable) {
|
|
PROC_LOCK(p);
|
|
racct_sub(p, RACCT_NPROC, 1);
|
|
PROC_UNLOCK(p);
|
|
}
|
|
#endif
|
|
racct_proc_exit(p);
|
|
|
|
/*
|
|
* Free credentials, arguments, and sigacts.
|
|
*/
|
|
crfree(p->p_ucred);
|
|
proc_set_cred(p, 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_proc_destroy(p);
|
|
#endif
|
|
|
|
KASSERT(FIRST_THREAD_IN_PROC(p),
|
|
("proc_reap: no residual thread!"));
|
|
uma_zfree(proc_zone, p);
|
|
atomic_add_int(&nprocs, -1);
|
|
}
|
|
|
|
static int
|
|
proc_to_reap(struct thread *td, struct proc *p, idtype_t idtype, id_t id,
|
|
int *status, int options, struct __wrusage *wrusage, siginfo_t *siginfo,
|
|
int check_only)
|
|
{
|
|
struct rusage *rup;
|
|
|
|
sx_assert(&proctree_lock, SA_XLOCKED);
|
|
|
|
PROC_LOCK(p);
|
|
|
|
switch (idtype) {
|
|
case P_ALL:
|
|
if (p->p_procdesc != NULL) {
|
|
PROC_UNLOCK(p);
|
|
return (0);
|
|
}
|
|
break;
|
|
case P_PID:
|
|
if (p->p_pid != (pid_t)id) {
|
|
PROC_UNLOCK(p);
|
|
return (0);
|
|
}
|
|
break;
|
|
case P_PGID:
|
|
if (p->p_pgid != (pid_t)id) {
|
|
PROC_UNLOCK(p);
|
|
return (0);
|
|
}
|
|
break;
|
|
case P_SID:
|
|
if (p->p_session->s_sid != (pid_t)id) {
|
|
PROC_UNLOCK(p);
|
|
return (0);
|
|
}
|
|
break;
|
|
case P_UID:
|
|
if (p->p_ucred->cr_uid != (uid_t)id) {
|
|
PROC_UNLOCK(p);
|
|
return (0);
|
|
}
|
|
break;
|
|
case P_GID:
|
|
if (p->p_ucred->cr_gid != (gid_t)id) {
|
|
PROC_UNLOCK(p);
|
|
return (0);
|
|
}
|
|
break;
|
|
case P_JAILID:
|
|
if (p->p_ucred->cr_prison->pr_id != (int)id) {
|
|
PROC_UNLOCK(p);
|
|
return (0);
|
|
}
|
|
break;
|
|
/*
|
|
* It seems that the thread structures get zeroed out
|
|
* at process exit. This makes it impossible to
|
|
* support P_SETID, P_CID or P_CPUID.
|
|
*/
|
|
default:
|
|
PROC_UNLOCK(p);
|
|
return (0);
|
|
}
|
|
|
|
if (p_canwait(td, p)) {
|
|
PROC_UNLOCK(p);
|
|
return (0);
|
|
}
|
|
|
|
if (((options & WEXITED) == 0) && (p->p_state == PRS_ZOMBIE)) {
|
|
PROC_UNLOCK(p);
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* 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);
|
|
return (0);
|
|
}
|
|
|
|
if (siginfo != NULL) {
|
|
bzero(siginfo, sizeof(*siginfo));
|
|
siginfo->si_errno = 0;
|
|
|
|
/*
|
|
* SUSv4 requires that the si_signo value is always
|
|
* SIGCHLD. Obey it despite the rfork(2) interface
|
|
* allows to request other signal for child exit
|
|
* notification.
|
|
*/
|
|
siginfo->si_signo = SIGCHLD;
|
|
|
|
/*
|
|
* This is still a rough estimate. We will fix the
|
|
* cases TRAPPED, STOPPED, and CONTINUED later.
|
|
*/
|
|
if (WCOREDUMP(p->p_xsig)) {
|
|
siginfo->si_code = CLD_DUMPED;
|
|
siginfo->si_status = WTERMSIG(p->p_xsig);
|
|
} else if (WIFSIGNALED(p->p_xsig)) {
|
|
siginfo->si_code = CLD_KILLED;
|
|
siginfo->si_status = WTERMSIG(p->p_xsig);
|
|
} else {
|
|
siginfo->si_code = CLD_EXITED;
|
|
siginfo->si_status = p->p_xexit;
|
|
}
|
|
|
|
siginfo->si_pid = p->p_pid;
|
|
siginfo->si_uid = p->p_ucred->cr_uid;
|
|
|
|
/*
|
|
* The si_addr field would be useful additional
|
|
* detail, but apparently the PC value may be lost
|
|
* when we reach this point. bzero() above sets
|
|
* siginfo->si_addr to NULL.
|
|
*/
|
|
}
|
|
|
|
/*
|
|
* There should be no reason to limit resources usage info to
|
|
* exited processes only. A snapshot about any resources used
|
|
* by a stopped process may be exactly what is needed.
|
|
*/
|
|
if (wrusage != NULL) {
|
|
rup = &wrusage->wru_self;
|
|
*rup = p->p_ru;
|
|
PROC_STATLOCK(p);
|
|
calcru(p, &rup->ru_utime, &rup->ru_stime);
|
|
PROC_STATUNLOCK(p);
|
|
|
|
rup = &wrusage->wru_children;
|
|
*rup = p->p_stats->p_cru;
|
|
calccru(p, &rup->ru_utime, &rup->ru_stime);
|
|
}
|
|
|
|
if (p->p_state == PRS_ZOMBIE && !check_only) {
|
|
proc_reap(td, p, status, options);
|
|
return (-1);
|
|
}
|
|
return (1);
|
|
}
|
|
|
|
int
|
|
kern_wait(struct thread *td, pid_t pid, int *status, int options,
|
|
struct rusage *rusage)
|
|
{
|
|
struct __wrusage wru, *wrup;
|
|
idtype_t idtype;
|
|
id_t id;
|
|
int ret;
|
|
|
|
/*
|
|
* Translate the special pid values into the (idtype, pid)
|
|
* pair for kern_wait6. The WAIT_MYPGRP case is handled by
|
|
* kern_wait6() on its own.
|
|
*/
|
|
if (pid == WAIT_ANY) {
|
|
idtype = P_ALL;
|
|
id = 0;
|
|
} else if (pid < 0) {
|
|
idtype = P_PGID;
|
|
id = (id_t)-pid;
|
|
} else {
|
|
idtype = P_PID;
|
|
id = (id_t)pid;
|
|
}
|
|
|
|
if (rusage != NULL)
|
|
wrup = &wru;
|
|
else
|
|
wrup = NULL;
|
|
|
|
/*
|
|
* For backward compatibility we implicitly add flags WEXITED
|
|
* and WTRAPPED here.
|
|
*/
|
|
options |= WEXITED | WTRAPPED;
|
|
ret = kern_wait6(td, idtype, id, status, options, wrup, NULL);
|
|
if (rusage != NULL)
|
|
*rusage = wru.wru_self;
|
|
return (ret);
|
|
}
|
|
|
|
static void
|
|
report_alive_proc(struct thread *td, struct proc *p, siginfo_t *siginfo,
|
|
int *status, int options, int si_code)
|
|
{
|
|
bool cont;
|
|
|
|
PROC_LOCK_ASSERT(p, MA_OWNED);
|
|
sx_assert(&proctree_lock, SA_XLOCKED);
|
|
MPASS(si_code == CLD_TRAPPED || si_code == CLD_STOPPED ||
|
|
si_code == CLD_CONTINUED);
|
|
|
|
cont = si_code == CLD_CONTINUED;
|
|
if ((options & WNOWAIT) == 0) {
|
|
if (cont)
|
|
p->p_flag &= ~P_CONTINUED;
|
|
else
|
|
p->p_flag |= P_WAITED;
|
|
PROC_LOCK(td->td_proc);
|
|
sigqueue_take(p->p_ksi);
|
|
PROC_UNLOCK(td->td_proc);
|
|
}
|
|
sx_xunlock(&proctree_lock);
|
|
if (siginfo != NULL) {
|
|
siginfo->si_code = si_code;
|
|
siginfo->si_status = cont ? SIGCONT : p->p_xsig;
|
|
}
|
|
if (status != NULL)
|
|
*status = cont ? SIGCONT : W_STOPCODE(p->p_xsig);
|
|
PROC_UNLOCK(p);
|
|
td->td_retval[0] = p->p_pid;
|
|
}
|
|
|
|
int
|
|
kern_wait6(struct thread *td, idtype_t idtype, id_t id, int *status,
|
|
int options, struct __wrusage *wrusage, siginfo_t *siginfo)
|
|
{
|
|
struct proc *p, *q;
|
|
pid_t pid;
|
|
int error, nfound, ret;
|
|
bool report;
|
|
|
|
AUDIT_ARG_VALUE((int)idtype); /* XXX - This is likely wrong! */
|
|
AUDIT_ARG_PID((pid_t)id); /* XXX - This may be wrong! */
|
|
AUDIT_ARG_VALUE(options);
|
|
|
|
q = td->td_proc;
|
|
|
|
if ((pid_t)id == WAIT_MYPGRP && (idtype == P_PID || idtype == P_PGID)) {
|
|
PROC_LOCK(q);
|
|
id = (id_t)q->p_pgid;
|
|
PROC_UNLOCK(q);
|
|
idtype = P_PGID;
|
|
}
|
|
|
|
/* If we don't know the option, just return. */
|
|
if ((options & ~(WUNTRACED | WNOHANG | WCONTINUED | WNOWAIT |
|
|
WEXITED | WTRAPPED | WLINUXCLONE)) != 0)
|
|
return (EINVAL);
|
|
if ((options & (WEXITED | WUNTRACED | WCONTINUED | WTRAPPED)) == 0) {
|
|
/*
|
|
* We will be unable to find any matching processes,
|
|
* because there are no known events to look for.
|
|
* Prefer to return error instead of blocking
|
|
* indefinitely.
|
|
*/
|
|
return (EINVAL);
|
|
}
|
|
|
|
loop:
|
|
if (q->p_flag & P_STATCHILD) {
|
|
PROC_LOCK(q);
|
|
q->p_flag &= ~P_STATCHILD;
|
|
PROC_UNLOCK(q);
|
|
}
|
|
sx_xlock(&proctree_lock);
|
|
loop_locked:
|
|
nfound = 0;
|
|
LIST_FOREACH(p, &q->p_children, p_sibling) {
|
|
pid = p->p_pid;
|
|
ret = proc_to_reap(td, p, idtype, id, status, options,
|
|
wrusage, siginfo, 0);
|
|
if (ret == 0)
|
|
continue;
|
|
else if (ret != 1) {
|
|
td->td_retval[0] = pid;
|
|
return (0);
|
|
}
|
|
|
|
nfound++;
|
|
PROC_LOCK_ASSERT(p, MA_OWNED);
|
|
|
|
if ((options & WTRAPPED) != 0 &&
|
|
(p->p_flag & P_TRACED) != 0) {
|
|
PROC_SLOCK(p);
|
|
report =
|
|
((p->p_flag & (P_STOPPED_TRACE | P_STOPPED_SIG)) &&
|
|
p->p_suspcount == p->p_numthreads &&
|
|
(p->p_flag & P_WAITED) == 0);
|
|
PROC_SUNLOCK(p);
|
|
if (report) {
|
|
CTR4(KTR_PTRACE,
|
|
"wait: returning trapped pid %d status %#x "
|
|
"(xstat %d) xthread %d",
|
|
p->p_pid, W_STOPCODE(p->p_xsig), p->p_xsig,
|
|
p->p_xthread != NULL ?
|
|
p->p_xthread->td_tid : -1);
|
|
report_alive_proc(td, p, siginfo, status,
|
|
options, CLD_TRAPPED);
|
|
return (0);
|
|
}
|
|
}
|
|
if ((options & WUNTRACED) != 0 &&
|
|
(p->p_flag & P_STOPPED_SIG) != 0) {
|
|
PROC_SLOCK(p);
|
|
report = (p->p_suspcount == p->p_numthreads &&
|
|
((p->p_flag & P_WAITED) == 0));
|
|
PROC_SUNLOCK(p);
|
|
if (report) {
|
|
report_alive_proc(td, p, siginfo, status,
|
|
options, CLD_STOPPED);
|
|
return (0);
|
|
}
|
|
}
|
|
if ((options & WCONTINUED) != 0 &&
|
|
(p->p_flag & P_CONTINUED) != 0) {
|
|
report_alive_proc(td, p, siginfo, status, options,
|
|
CLD_CONTINUED);
|
|
return (0);
|
|
}
|
|
PROC_UNLOCK(p);
|
|
}
|
|
|
|
/*
|
|
* Look in the orphans list too, to allow the parent to
|
|
* collect it's child exit status even if child is being
|
|
* debugged.
|
|
*
|
|
* Debugger detaches from the parent upon successful
|
|
* switch-over from parent to child. At this point due to
|
|
* re-parenting the parent loses the child to debugger and a
|
|
* wait4(2) call would report that it has no children to wait
|
|
* for. By maintaining a list of orphans we allow the parent
|
|
* to successfully wait until the child becomes a zombie.
|
|
*/
|
|
if (nfound == 0) {
|
|
LIST_FOREACH(p, &q->p_orphans, p_orphan) {
|
|
ret = proc_to_reap(td, p, idtype, id, NULL, options,
|
|
NULL, NULL, 1);
|
|
if (ret != 0) {
|
|
KASSERT(ret != -1, ("reaped an orphan (pid %d)",
|
|
(int)td->td_retval[0]));
|
|
PROC_UNLOCK(p);
|
|
nfound++;
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
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);
|
|
if (q->p_flag & P_STATCHILD) {
|
|
q->p_flag &= ~P_STATCHILD;
|
|
PROC_UNLOCK(q);
|
|
goto loop_locked;
|
|
}
|
|
sx_xunlock(&proctree_lock);
|
|
error = msleep(q, &q->p_mtx, PWAIT | PCATCH | PDROP, "wait", 0);
|
|
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, bool set_oppid)
|
|
{
|
|
|
|
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);
|
|
|
|
clear_orphan(child);
|
|
if (child->p_flag & P_TRACED) {
|
|
if (LIST_EMPTY(&child->p_pptr->p_orphans)) {
|
|
child->p_treeflag |= P_TREE_FIRST_ORPHAN;
|
|
LIST_INSERT_HEAD(&child->p_pptr->p_orphans, child,
|
|
p_orphan);
|
|
} else {
|
|
LIST_INSERT_AFTER(LIST_FIRST(&child->p_pptr->p_orphans),
|
|
child, p_orphan);
|
|
}
|
|
child->p_treeflag |= P_TREE_ORPHANED;
|
|
}
|
|
|
|
child->p_pptr = parent;
|
|
if (set_oppid)
|
|
child->p_oppid = parent->p_pid;
|
|
}
|