1/* 2 * Copyright (c) 2007, 2008, 2011-2013 Apple Inc. All rights reserved. 3 * 4 * @APPLE_OSREFERENCE_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. The rights granted to you under the License 10 * may not be used to create, or enable the creation or redistribution of, 11 * unlawful or unlicensed copies of an Apple operating system, or to 12 * circumvent, violate, or enable the circumvention or violation of, any 13 * terms of an Apple operating system software license agreement. 14 * 15 * Please obtain a copy of the License at 16 * http://www.opensource.apple.com/apsl/ and read it before using this file. 17 * 18 * The Original Code and all software distributed under the License are 19 * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER 20 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, 21 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, 22 * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. 23 * Please see the License for the specific language governing rights and 24 * limitations under the License. 25 * 26 * @APPLE_OSREFERENCE_LICENSE_HEADER_END@ 27 */ 28 29#include <TargetConditionals.h> // for TARGET_OS_EMBEDDED 30 31#include <stddef.h> 32#include <stdlib.h> 33#include <libc_private.h> 34#include <pthread.h> 35#include <pthread/private.h> 36#include <dlfcn.h> 37#include <errno.h> 38#include <_libkernel_init.h> // Must be after voucher_private.h 39 40// system library initialisers 41extern void mach_init(void); // from libsystem_kernel.dylib 42extern void __libplatform_init(void *future_use, const char *envp[], const char *apple[], const struct ProgramVars *vars); 43extern void __pthread_init(const struct _libpthread_functions *libpthread_funcs, const char *envp[], const char *apple[], const struct ProgramVars *vars); // from libsystem_pthread.dylib 44extern void __malloc_init(const char *apple[]); // from libsystem_malloc.dylib 45extern void __keymgr_initializer(void); // from libkeymgr.dylib 46extern void _dyld_initializer(void); // from libdyld.dylib 47extern void libdispatch_init(void); // from libdispatch.dylib 48extern void _libxpc_initializer(void); // from libxpc.dylib 49extern void _libsecinit_initializer(void); // from libsecinit.dylib 50 51 52// signal malloc stack logging that initialisation has finished 53extern void __stack_logging_early_finished(void); // form libsystem_c.dylib 54 55// clear qos tsd (from pthread) 56extern void _pthread_clear_qos_tsd(mach_port_t) __attribute__((weak_import)); 57 58// system library atfork handlers 59extern void _pthread_fork_prepare(void); 60extern void _pthread_fork_parent(void); 61extern void _pthread_fork_child(void); 62extern void _pthread_fork_child_postinit(void); 63extern void _pthread_exit_if_canceled(int); 64 65extern void dispatch_atfork_prepare(void); 66extern void dispatch_atfork_parent(void); 67extern void dispatch_atfork_child(void); 68 69extern void _malloc_fork_prepare(void); 70extern void _malloc_fork_parent(void); 71extern void _malloc_fork_child(void); 72 73extern void _mach_fork_child(void); 74extern void _notify_fork_child(void); 75extern void _dyld_fork_child(void); 76extern void xpc_atfork_prepare(void); 77extern void xpc_atfork_parent(void); 78extern void xpc_atfork_child(void); 79extern void _libSC_info_fork_prepare(void); 80extern void _libSC_info_fork_parent(void); 81extern void _libSC_info_fork_child(void); 82extern void _asl_fork_child(void); 83 84#if defined(HAVE_SYSTEM_CORESERVICES) 85// libsystem_coreservices.dylib 86extern void _libcoreservices_fork_child(void); 87extern char *_dirhelper(int, char *, size_t); 88#endif 89 90#if TARGET_IPHONE_SIMULATOR 91// no-op _pthread_clear_qos_tsd in the simulator, as its an upcall from libsyscall 92#define _pthread_clear_qos_tsd NULL 93#endif 94 95// advance decls for below; 96void libSystem_atfork_prepare(void); 97void libSystem_atfork_parent(void); 98void libSystem_atfork_child(void); 99 100// libsyscall_initializer() initializes all of libSystem.dylib 101// <rdar://problem/4892197> 102__attribute__((constructor)) 103static void 104libSystem_initializer(int argc, 105 const char* argv[], 106 const char* envp[], 107 const char* apple[], 108 const struct ProgramVars* vars) 109{ 110 static const struct _libkernel_functions libkernel_funcs = { 111 .version = 3, 112 // V1 functions 113 .dlsym = dlsym, 114 .malloc = malloc, 115 .free = free, 116 .realloc = realloc, 117 ._pthread_exit_if_canceled = _pthread_exit_if_canceled, 118 // V2 functions (removed) 119 // V3 functions 120 .pthread_clear_qos_tsd = _pthread_clear_qos_tsd, 121 }; 122 123 static const struct _libpthread_functions libpthread_funcs = { 124 .version = 2, 125 .exit = exit, 126 .malloc = malloc, 127 .free = free, 128 }; 129 130 static const struct _libc_functions libc_funcs = { 131 .version = 1, 132 .atfork_prepare = libSystem_atfork_prepare, 133 .atfork_parent = libSystem_atfork_parent, 134 .atfork_child = libSystem_atfork_child, 135#if defined(HAVE_SYSTEM_CORESERVICES) 136 .dirhelper = _dirhelper, 137#endif 138 }; 139 140 __libkernel_init(&libkernel_funcs, envp, apple, vars); 141 142 __libplatform_init(NULL, envp, apple, vars); 143 __pthread_init(&libpthread_funcs, envp, apple, vars); 144 _libc_initializer(&libc_funcs, envp, apple, vars); 145 146 // TODO: Move __malloc_init before __libc_init after breaking malloc's upward link to Libc 147 __malloc_init(apple); 148 149#if !TARGET_IPHONE_SIMULATOR 150 /* <rdar://problem/9664631> */ 151 __keymgr_initializer(); 152#endif 153 154 _dyld_initializer(); 155 libdispatch_init(); 156 _libxpc_initializer(); 157 158#if !(TARGET_OS_EMBEDDED || TARGET_OS_IPHONE || TARGET_IPHONE_SIMULATOR) 159 _libsecinit_initializer(); 160#endif 161 162 __stack_logging_early_finished(); 163 164 165 /* <rdar://problem/11588042> 166 * C99 standard has the following in section 7.5(3): 167 * "The value of errno is zero at program startup, but is never set 168 * to zero by any library function." 169 */ 170 errno = 0; 171} 172 173/* 174 * libSystem_atfork_{prepare,parent,child}() are called by libc during fork(2). 175 * They call the corresponding atfork handlers for other libsystem components. 176 */ 177void 178libSystem_atfork_prepare(void) 179{ 180 _libSC_info_fork_prepare(); 181 xpc_atfork_prepare(); 182 dispatch_atfork_prepare(); 183 _pthread_fork_prepare(); 184 _malloc_fork_prepare(); 185} 186 187void 188libSystem_atfork_parent(void) 189{ 190 _malloc_fork_parent(); 191 _pthread_fork_parent(); 192 dispatch_atfork_parent(); 193 xpc_atfork_parent(); 194 _libSC_info_fork_parent(); 195} 196 197void 198libSystem_atfork_child(void) 199{ 200 _dyld_fork_child(); 201 _pthread_fork_child(); 202 _malloc_fork_child(); 203 dispatch_atfork_child(); 204 205 _mach_fork_child(); 206 _libc_fork_child(); 207 208#if defined(HAVE_SYSTEM_CORESERVICES) 209 _libcoreservices_fork_child(); 210#endif 211 212 _asl_fork_child(); 213 _notify_fork_child(); 214 xpc_atfork_child(); 215 _libSC_info_fork_child(); 216 217 _pthread_fork_child_postinit(); 218} 219 220/* 221 * Old crt1.o glue used to call through mach_init_routine which was used to initialize libSystem. 222 * LibSystem now auto-initializes but mach_init_routine is left for binary compatibility. 223 */ 224static void mach_init_old(void) {} 225void (*mach_init_routine)(void) = &mach_init_old; 226 227/* 228 * This __crashreporter_info__ symbol is for all non-dylib parts of libSystem. 229 */ 230const char *__crashreporter_info__; 231asm (".desc __crashreporter_info__, 0x10"); 232