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