119 lines
3.2 KiB
C
119 lines
3.2 KiB
C
/* $OpenBSD: rthread_fork.c,v 1.23 2017/10/29 08:45:53 mpi Exp $ */
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/*
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* Copyright (c) 2008 Kurt Miller <kurt@openbsd.org>
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* Copyright (c) 2008 Philip Guenther <guenther@openbsd.org>
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* Copyright (c) 2003 Daniel Eischen <deischen@freebsd.org>
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* All rights reserved.
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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. Neither the name of the author nor the names of any co-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 AUTHOR 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 AUTHOR 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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* $FreeBSD: /repoman/r/ncvs/src/lib/libc_r/uthread/uthread_atfork.c,v 1.1 2004/12/10 03:36:45 grog Exp $
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*/
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#ifndef NO_PIC
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#include <sys/types.h>
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#include <elf.h>
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#pragma weak _DYNAMIC
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#endif
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#include <errno.h>
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#include <pthread.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <tib.h>
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#include <unistd.h>
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#include "rthread.h"
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#include "rthread_cb.h"
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/* make {fork,vfork,getthrid} call _thread_sys_{fork,vfork,getthrid} */
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REDIRECT_SYSCALL(fork);
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REDIRECT_SYSCALL(vfork);
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REDIRECT_SYSCALL(getthrid);
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static pid_t
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_dofork(pid_t (*sys_fork)(void))
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{
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pthread_t me;
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pid_t newid;
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extern int _post_threaded;
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if (!_threads_ready)
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return sys_fork();
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me = pthread_self();
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/*
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* Protect important libc/ld.so critical areas across the fork call.
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* dlclose() will grab the atexit lock via __cxa_finalize() so lock
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* the dl_lock first. malloc()/free() can use arc4random(), so lock
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* malloc_lock before arc4_lock
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*/
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#ifndef NO_PIC
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if (_DYNAMIC)
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_rthread_dl_lock(0);
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#endif
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newid = _thread_dofork(sys_fork);
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if (newid == 0) {
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struct tib *tib = me->tib;
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#ifndef NO_PIC
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/* reinitialize the lock in the child */
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if (_DYNAMIC)
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_rthread_dl_lock(2);
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#endif
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/* update this thread's structure */
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tib->tib_tid = getthrid();
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me->donesem.lock = _SPINLOCK_UNLOCKED;
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me->flags_lock = _SPINLOCK_UNLOCKED;
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/* reinit the thread list */
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LIST_INIT(&_thread_list);
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LIST_INSERT_HEAD(&_thread_list, me, threads);
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_thread_lock = _SPINLOCK_UNLOCKED;
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/* single threaded now */
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__isthreaded = 0;
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_post_threaded = 0; /* notyet... */
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}
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#ifndef NO_PIC
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else if (_DYNAMIC)
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_rthread_dl_lock(1);
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#endif
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return newid;
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}
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pid_t
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_thread_fork(void)
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{
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return _dofork(&fork);
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}
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pid_t
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_thread_vfork(void)
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{
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return _dofork(&vfork);
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}
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