GCC Code Coverage Report
Directory: ./ Exec Total Coverage
File: lib/librthread/rthread_fork.c Lines: 11 24 45.8 %
Date: 2017-11-13 Branches: 4 12 33.3 %

Line Branch Exec Source
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/*	$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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}