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/* $OpenBSD: w_fork.c,v 1.3 2016/05/07 19:05:22 guenther Exp $ */
/*
* Copyright (c) 2008 Kurt Miller <kurt@openbsd.org>
* Copyright (c) 2008 Philip Guenther <guenther@openbsd.org>
* Copyright (c) 2003 Daniel Eischen <deischen@freebsd.org>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Neither the name of the author nor the names of any co-contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* $FreeBSD: /repoman/r/ncvs/src/lib/libc_r/uthread/uthread_atfork.c,v 1.1 2004/12/10 03:36:45 grog Exp $
*/
#include <tib.h>
#include <unistd.h>
#include "thread_private.h"
#include "atfork.h"
pid_t
WRAP(fork)(void)
{
struct atfork_fn *p;
pid_t newid;
/*
* In the common case the list is empty; remain async-signal-safe
* then by skipping the locking and just forking
*/
if (TAILQ_FIRST(&_atfork_list) == NULL) {
if (_thread_cb.tc_fork != NULL)
return _thread_cb.tc_fork();
newid = fork();
if (newid == 0)
TIB_GET()->tib_tid = getthrid();
return newid;
}
_ATFORK_LOCK();
TAILQ_FOREACH_REVERSE(p, &_atfork_list, atfork_listhead, fn_next)
if (p->fn_prepare)
p->fn_prepare();
if (_thread_cb.tc_fork != NULL)
newid = _thread_cb.tc_fork();
else {
newid = fork();
if (newid == 0)
TIB_GET()->tib_tid = getthrid();
}
if (newid == 0) {
TAILQ_FOREACH(p, &_atfork_list, fn_next)
if (p->fn_child)
p->fn_child();
} else {
TAILQ_FOREACH(p, &_atfork_list, fn_next)
if (p->fn_parent)
p->fn_parent();
}
_ATFORK_UNLOCK();
return (newid);
}
DEF_WRAP(fork);
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