1/*
2 * Copyright (c) 2007, 2008, 2011, 2012 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 <pthread.h>
32#include <pthread/private.h>
33#include <_libkernel_init.h>
34#include <stdlib.h>
35#include <dlfcn.h>
36#include <errno.h>
37#include <TargetConditionals.h>
38
39struct ProgramVars; /* forward reference */
40
41// system library initialisers
42extern void bootstrap_init(void);		// from liblaunch.dylib
43extern void mach_init(void);			// from libsystem_kernel.dylib
44extern void __libplatform_init(void *future_use, const char *envp[], const char *apple[], const struct ProgramVars *vars);
45extern void __pthread_init(const struct _libpthread_functions *libpthread_funcs, const char *envp[], const char *apple[], const struct ProgramVars *vars);	// from libsystem_pthread.dylib
46extern void __libc_init(const struct ProgramVars *vars, void (*atfork_prepare)(void), void (*atfork_parent)(void), void (*atfork_child)(void), const char *apple[]);	// from libsystem_c.dylib
47extern void __malloc_init(const char *apple[]); // from libsystem_malloc.dylib
48extern void __keymgr_initializer(void);		// from libkeymgr.dylib
49extern void _dyld_initializer(void);		// from libdyld.dylib
50extern void libdispatch_init(void);		// from libdispatch.dylib
51extern void _libxpc_initializer(void);		// from libxpc.dylib
52
53// signal malloc stack logging that initialisation has finished
54extern void __stack_logging_early_finished(void); // form libsystem_c.dylib
55
56// system library atfork handlers
57extern void _pthread_fork_prepare(void);
58extern void _pthread_fork_parent(void);
59extern void _pthread_fork_child(void);
60extern void _pthread_fork_child_postinit(void);
61
62extern void dispatch_atfork_prepare(void);
63extern void dispatch_atfork_parent(void);
64extern void dispatch_atfork_child(void);
65
66extern void _malloc_fork_prepare(void);
67extern void _malloc_fork_parent(void);
68extern void _malloc_fork_child(void);
69
70extern void _mach_fork_child(void);
71extern void _libc_fork_child(void);
72extern void _notify_fork_child(void);
73extern void _dyld_fork_child(void);
74extern void xpc_atfork_prepare(void);
75extern void xpc_atfork_parent(void);
76extern void xpc_atfork_child(void);
77extern void _libSC_info_fork_prepare(void);
78extern void _libSC_info_fork_parent(void);
79extern void _libSC_info_fork_child(void);
80extern void _asl_fork_child(void);
81
82// advance decls for below;
83void libSystem_atfork_prepare(void);
84void libSystem_atfork_parent(void);
85void libSystem_atfork_child(void);
86
87void _pthread_exit_if_canceled(int);
88
89/*
90 * libsyscall_initializer() initializes all of libSystem.dylib <rdar://problem/4892197>
91 */
92static __attribute__((constructor))
93void libSystem_initializer(int argc, const char* argv[], const char* envp[], const char* apple[], const struct ProgramVars* vars)
94{
95	static const struct _libkernel_functions libkernel_funcs = {
96		.version = 1,
97		.dlsym = dlsym,
98		.malloc = malloc,
99		.free = free,
100		.realloc = realloc,
101		._pthread_exit_if_canceled = _pthread_exit_if_canceled,
102	};
103
104	static const struct _libpthread_functions libpthread_funcs = {
105		.version = 1,
106		.exit = exit,
107	};
108
109	__libkernel_init(&libkernel_funcs, envp, apple, vars);
110
111	bootstrap_init();
112	__libplatform_init(NULL, envp, apple, vars);
113
114	__pthread_init(&libpthread_funcs, envp, apple, vars);
115	__libc_init(vars, libSystem_atfork_prepare, libSystem_atfork_parent, libSystem_atfork_child, apple);
116
117	// TODO: Move __malloc_init before __libc_init after breaking malloc's upward link to Libc
118	__malloc_init(apple);
119
120	_dyld_initializer();
121	libdispatch_init();
122	_libxpc_initializer();
123
124	__stack_logging_early_finished();
125
126	/* <rdar://problem/11588042>
127	 * C99 standard has the following in section 7.5(3):
128	 * "The value of errno is zero at program startup, but is never set
129	 * to zero by any library function."
130	 */
131	errno = 0;
132}
133
134/*
135 * libSystem_atfork_{prepare,parent,child}() are called by libc when we fork, then we deal with running fork handlers
136 * for everyone else.
137 */
138void libSystem_atfork_prepare(void)
139{
140	_libSC_info_fork_prepare();
141	xpc_atfork_prepare();
142	dispatch_atfork_prepare();
143	_pthread_fork_prepare();
144	_malloc_fork_prepare();
145}
146
147void libSystem_atfork_parent(void)
148{
149	_malloc_fork_parent();
150	_pthread_fork_parent();
151	dispatch_atfork_parent();
152	xpc_atfork_parent();
153	_libSC_info_fork_parent();
154}
155
156void libSystem_atfork_child(void)
157{
158	_dyld_fork_child();
159	_pthread_fork_child();
160	_malloc_fork_child();
161	dispatch_atfork_child();
162
163	bootstrap_init();
164	_mach_fork_child();
165	_libc_fork_child();
166	_asl_fork_child();
167	_notify_fork_child();
168	xpc_atfork_child();
169	_libSC_info_fork_child();
170
171	_pthread_fork_child_postinit();
172}
173
174/*
175 *  Old crt1.o glue used to call through mach_init_routine which was used to initialize libSystem.
176 *  LibSystem now auto-initializes but mach_init_routine is left for binary compatibility.
177 */
178static void mach_init_old(void) {}
179void (*mach_init_routine)(void) = &mach_init_old;
180
181/*
182 *	This __crashreporter_info__ symbol is for all non-dylib parts of libSystem.
183 */
184const char *__crashreporter_info__;
185asm (".desc __crashreporter_info__, 0x10");
186