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