GCC Code Coverage Report
Directory: ./ Exec Total Coverage
File: lib/libc/sys/w_fork.c Lines: 7 26 26.9 %
Date: 2017-11-07 Branches: 4 28 14.3 %

Line Branch Exec Source
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/*	$OpenBSD: w_fork.c,v 1.3 2016/05/07 19:05:22 guenther 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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#include <tib.h>
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#include <unistd.h>
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#include "thread_private.h"
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#include "atfork.h"
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pid_t
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WRAP(fork)(void)
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{
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	struct atfork_fn *p;
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	pid_t newid;
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	/*
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	 * In the common case the list is empty; remain async-signal-safe
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	 * then by skipping the locking and just forking
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	 */
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	if (TAILQ_FIRST(&_atfork_list) == NULL) {
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		if (_thread_cb.tc_fork != NULL)
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			return _thread_cb.tc_fork();
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		newid = fork();
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		if (newid == 0)
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			TIB_GET()->tib_tid = getthrid();
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		return newid;
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	}
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	_ATFORK_LOCK();
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	TAILQ_FOREACH_REVERSE(p, &_atfork_list, atfork_listhead, fn_next)
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		if (p->fn_prepare)
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			p->fn_prepare();
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	if (_thread_cb.tc_fork != NULL)
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		newid = _thread_cb.tc_fork();
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	else {
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		newid = fork();
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		if (newid == 0)
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			TIB_GET()->tib_tid = getthrid();
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	}
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	if (newid == 0) {
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		TAILQ_FOREACH(p, &_atfork_list, fn_next)
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			if (p->fn_child)
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				p->fn_child();
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	} else {
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		TAILQ_FOREACH(p, &_atfork_list, fn_next)
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			if (p->fn_parent)
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				p->fn_parent();
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	}
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	_ATFORK_UNLOCK();
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	return (newid);
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}
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DEF_WRAP(fork);