1/*
2 * Copyright (c) 2010 Apple Computer, Inc. All rights reserved.
3 *
4 * @APPLE_LICENSE_HEADER_START@
5 *
6 * This file contains Original Code and/or Modifications of Original Code
7 * as defined in and that are subject to the Apple Public Source License
8 * Version 2.0 (the 'License'). You may not use this file except in
9 * compliance with the License. Please obtain a copy of the License at
10 * http://www.opensource.apple.com/apsl/ and read it before using this
11 * file.
12 *
13 * The Original Code and all software distributed under the License are
14 * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
15 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
16 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
17 * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
18 * Please see the License for the specific language governing rights and
19 * limitations under the License.
20 *
21 * @APPLE_LICENSE_HEADER_END@
22 */
23#include <sys/types.h>
24#include <sys/stat.h>
25#include <errno.h>
26#include <TargetConditionals.h>
27
28#include "libc_private.h"
29
30extern pid_t __fork(void);
31
32static void (*_libSystem_atfork_prepare)(void) = 0;
33static void (*_libSystem_atfork_parent)(void) = 0;
34static void (*_libSystem_atfork_child)(void) = 0;
35
36__private_extern__
37void _libc_fork_init(const struct _libc_functions *funcs)
38{
39	_libSystem_atfork_prepare = funcs->atfork_prepare;
40	_libSystem_atfork_parent = funcs->atfork_parent;
41	_libSystem_atfork_child = funcs->atfork_child;
42}
43
44/*
45 * fork stub
46 */
47pid_t
48fork(void)
49{
50	int ret;
51
52	_libSystem_atfork_prepare();
53	// Reader beware: this __fork() call is yet another wrapper around the actual syscall
54	// and lives inside libsyscall. The fork syscall needs some cuddling by asm before it's
55	// allowed to see the big wide C world.
56	ret = __fork();
57	if (-1 == ret)
58	{
59		// __fork already set errno for us
60		_libSystem_atfork_parent();
61		return ret;
62	}
63
64	if (0 == ret)
65	{
66		// We're the child in this part.
67		_libSystem_atfork_child();
68		return 0;
69	}
70
71	_libSystem_atfork_parent();
72	return ret;
73}
74
75