Libsystem-159.tar.gz

[apple/libsystem.git] / init.c

diff --git a/init.c b/init.c
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+/*
+ * Copyright (c) 2007, 2008 Apple Inc. All rights reserved.
+ *
+ * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
+ * 
+ * This file contains Original Code and/or Modifications of Original Code
+ * as defined in and that are subject to the Apple Public Source License
+ * Version 2.0 (the 'License'). You may not use this file except in
+ * compliance with the License. The rights granted to you under the License
+ * may not be used to create, or enable the creation or redistribution of,
+ * unlawful or unlicensed copies of an Apple operating system, or to
+ * circumvent, violate, or enable the circumvention or violation of, any
+ * terms of an Apple operating system software license agreement.
+ * 
+ * Please obtain a copy of the License at
+ * http://www.opensource.apple.com/apsl/ and read it before using this file.
+ * 
+ * The Original Code and all software distributed under the License are
+ * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
+ * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
+ * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
+ * Please see the License for the specific language governing rights and
+ * limitations under the License.
+ * 
+ * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
+ */
+#ifdef __DYNAMIC__
+
+#include <TargetConditionals.h>        // for TARGET_OS_EMBEDDED
+
+#include <_libkernel_init.h>
+#include <dlfcn.h>
+
+struct ProgramVars; /* forward reference */
+
+// system library initialisers
+extern void bootstrap_init(void);              // from liblaunch.dylib
+extern void mach_init(void);                   // from libsystem_mach.dylib
+extern void pthread_init(void);                        // from libc.a
+extern void __libc_init(const struct ProgramVars *vars, void (*atfork_prepare)(void), void (*atfork_parent)(void), void (*atfork_child)(void), const char *apple[]);   // from libc.a
+extern void __keymgr_initializer(void);                // from libkeymgr.a
+extern void _dyld_initializer(void);           // from libdyld.a
+extern void libdispatch_init(void);            // from libdispatch.a
+extern void _libxpc_initializer(void);         // from libxpc
+
+// system library atfork handlers
+extern void _cthread_fork_prepare();
+extern void _cthread_fork_parent();
+extern void _cthread_fork_child();
+extern void _cthread_fork_child_postinit();
+
+extern void _mach_fork_child();
+extern void _cproc_fork_child();
+extern void _libc_fork_child();
+extern void _notify_fork_child();
+extern void _dyld_fork_child();
+extern void xpc_atfork_prepare();
+extern void xpc_atfork_parent();
+extern void xpc_atfork_child();
+
+// advance decls for below;
+void libSystem_atfork_prepare();
+void libSystem_atfork_parent();
+void libSystem_atfork_child();
+
+// from mig_support.c in libc
+mach_port_t _mig_get_reply_port();
+void _mig_set_reply_port(mach_port_t);
+
+void cthread_set_errno_self(int);
+int* __error(void);
+
+/*
+ * libsyscall_initializer() initializes all of libSystem.dylib <rdar://problem/4892197>
+ */
+static __attribute__((constructor)) 
+void libSystem_initializer(int argc, const char* argv[], const char* envp[], const char* apple[], const struct ProgramVars* vars)
+{
+       _libkernel_functions_t libkernel_funcs = {
+               .get_reply_port = _mig_get_reply_port,
+               .set_reply_port = _mig_set_reply_port,
+               .get_errno = __error,
+               .set_errno = cthread_set_errno_self,
+               .dlsym = dlsym,
+       };
+
+       _libkernel_init(libkernel_funcs);
+
+       bootstrap_init();
+       mach_init();
+       pthread_init();
+       __libc_init(vars, libSystem_atfork_prepare, libSystem_atfork_parent, libSystem_atfork_child, apple);
+       __keymgr_initializer();
+       _dyld_initializer();
+       libdispatch_init();
+#if !TARGET_OS_EMBEDDED || __IPHONE_OS_VERSION_MAX_ALLOWED >= 50000 // __IPHONE_5_0
+       _libxpc_initializer();
+#endif
+}
+
+/*
+ * libSystem_atfork_{prepare,parent,child}() are called by libc when we fork, then we deal with running fork handlers
+ * for everyone else.
+ */
+void libSystem_atfork_prepare()
+{
+#if !TARGET_OS_EMBEDDED || __IPHONE_OS_VERSION_MAX_ALLOWED >= 50000 // __IPHONE_5_0
+       xpc_atfork_prepare();
+#endif
+       _cthread_fork_prepare();
+}
+
+void libSystem_atfork_parent()
+{
+       _cthread_fork_parent();
+#if !TARGET_OS_EMBEDDED || __IPHONE_OS_VERSION_MAX_ALLOWED >= 50000 // __IPHONE_5_0
+       xpc_atfork_parent();
+#endif
+}
+
+void libSystem_atfork_child()
+{
+       _dyld_fork_child();
+       _cthread_fork_child();
+       
+       bootstrap_init();
+       _mach_fork_child();
+       _cproc_fork_child();
+       _libc_fork_child();
+       _notify_fork_child();
+#if !TARGET_OS_EMBEDDED || __IPHONE_OS_VERSION_MAX_ALLOWED >= 50000 // __IPHONE_5_0
+       xpc_atfork_child();
+#endif
+
+       _cthread_fork_child_postinit();
+}
+
+/*  
+ *  Old crt1.o glue used to call through mach_init_routine which was used to initialize libSystem.
+ *  LibSystem now auto-initializes but mach_init_routine is left for binary compatibility.
+ */
+static void mach_init_old() {}
+void (*mach_init_routine)(void) = &mach_init_old;
+
+/*
+ *     This __crashreporter_info__ symbol is for all non-dylib parts of libSystem.
+ */
+const char *__crashreporter_info__;
+asm (".desc __crashreporter_info__, 0x10");
+
+#endif /* __DYNAMIC__ */