linker/dlfcn.cpp - android_bionic - Gitiles

 /*
  * Copyright (C) 2007 The Android Open Source Project
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
  * You may obtain a copy of the License at
  *
  *      http://www.apache.org/licenses/LICENSE-2.0
  *
  * Unless required by applicable law or agreed to in writing, software
  * distributed under the License is distributed on an "AS IS" BASIS,
  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */

 #include "linker.h"

 #include <pthread.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
 #include <android/api-level.h>

 #include <bionic/pthread_internal.h>
 #include "private/bionic_tls.h"
 #include "private/ScopedPthreadMutexLocker.h"
 #include "private/ThreadLocalBuffer.h"

 /* This file hijacks the symbols stubbed out in libdl.so. */

 static pthread_mutex_t g_dl_mutex = PTHREAD_RECURSIVE_MUTEX_INITIALIZER_NP;

 static const char* __bionic_set_dlerror(char* new_value) {
   char** dlerror_slot = &reinterpret_cast<char**>(__get_tls())[TLS_SLOT_DLERROR];

   const char* old_value = *dlerror_slot;
   *dlerror_slot = new_value;
   return old_value;
 }

 static void __bionic_format_dlerror(const char* msg, const char* detail) {
   char* buffer = __get_thread()->dlerror_buffer;
   strlcpy(buffer, msg, __BIONIC_DLERROR_BUFFER_SIZE);
   if (detail != nullptr) {
     strlcat(buffer, ": ", __BIONIC_DLERROR_BUFFER_SIZE);
     strlcat(buffer, detail, __BIONIC_DLERROR_BUFFER_SIZE);
   }

   __bionic_set_dlerror(buffer);
 }

 const char* dlerror() {
   const char* old_value = __bionic_set_dlerror(nullptr);
   return old_value;
 }

 void android_get_LD_LIBRARY_PATH(char* buffer, size_t buffer_size) {
   ScopedPthreadMutexLocker locker(&g_dl_mutex);
   do_android_get_LD_LIBRARY_PATH(buffer, buffer_size);
 }

 void android_update_LD_LIBRARY_PATH(const char* ld_library_path) {
   ScopedPthreadMutexLocker locker(&g_dl_mutex);
   do_android_update_LD_LIBRARY_PATH(ld_library_path);
 }

 static void* dlopen_ext(const char* filename, int flags,
                         const android_dlextinfo* extinfo, void* caller_addr) {
   ScopedPthreadMutexLocker locker(&g_dl_mutex);
   void* result = do_dlopen(filename, flags, extinfo, caller_addr);
   if (result == nullptr) {
     __bionic_format_dlerror("dlopen failed", linker_get_error_buffer());
     return nullptr;
   }
   return result;
 }

 void* android_dlopen_ext(const char* filename, int flags, const android_dlextinfo* extinfo) {
   void* caller_addr = __builtin_return_address(0);
   return dlopen_ext(filename, flags, extinfo, caller_addr);
 }

 void* dlopen(const char* filename, int flags) {
   void* caller_addr = __builtin_return_address(0);
   return dlopen_ext(filename, flags, nullptr, caller_addr);
 }

 void* dlsym_impl(void* handle, const char* symbol, const char* version, void* caller_addr) {
   ScopedPthreadMutexLocker locker(&g_dl_mutex);
   void* result;
   if (!do_dlsym(handle, symbol, version, caller_addr, &result)) {
     __bionic_format_dlerror(linker_get_error_buffer(), nullptr);
     return nullptr;
   }

   return result;
 }

 void* dlsym(void* handle, const char* symbol) {
   void* caller_addr = __builtin_return_address(0);
   return dlsym_impl(handle, symbol, nullptr, caller_addr);
 }

 void* dlvsym(void* handle, const char* symbol, const char* version) {
   void* caller_addr = __builtin_return_address(0);
   return dlsym_impl(handle, symbol, version, caller_addr);
 }

 int dladdr(const void* addr, Dl_info* info) {
   ScopedPthreadMutexLocker locker(&g_dl_mutex);
   return do_dladdr(addr, info);
 }

 int dlclose(void* handle) {
   ScopedPthreadMutexLocker locker(&g_dl_mutex);
   int result = do_dlclose(handle);
   if (result != 0) {
     __bionic_format_dlerror("dlclose failed", linker_get_error_buffer());
   }
   return result;
 }

 int dl_iterate_phdr(int (*cb)(dl_phdr_info* info, size_t size, void* data), void* data) {
   ScopedPthreadMutexLocker locker(&g_dl_mutex);
   return do_dl_iterate_phdr(cb, data);
 }

 void android_set_application_target_sdk_version(uint32_t target) {
   // lock to avoid modification in the middle of dlopen.
   ScopedPthreadMutexLocker locker(&g_dl_mutex);
   set_application_target_sdk_version(target);
 }

 uint32_t android_get_application_target_sdk_version() {
   return get_application_target_sdk_version();
 }

 bool android_init_namespaces(const char* public_ns_sonames,
                              const char* anon_ns_library_path) {
   ScopedPthreadMutexLocker locker(&g_dl_mutex);
   bool success = init_namespaces(public_ns_sonames, anon_ns_library_path);
   if (!success) {
     __bionic_format_dlerror("android_init_namespaces failed", linker_get_error_buffer());
   }

   return success;
 }

 android_namespace_t* android_create_namespace(const char* name,
                                               const char* ld_library_path,
                                               const char* default_library_path,
                                               uint64_t type,
                                               const char* permitted_when_isolated_path,
                                               android_namespace_t* parent_namespace) {
   void* caller_addr = __builtin_return_address(0);
   ScopedPthreadMutexLocker locker(&g_dl_mutex);

   android_namespace_t* result = create_namespace(caller_addr,
                                                  name,
                                                  ld_library_path,
                                                  default_library_path,
                                                  type,
                                                  permitted_when_isolated_path,
                                                  parent_namespace);

   if (result == nullptr) {
     __bionic_format_dlerror("android_create_namespace failed", linker_get_error_buffer());
   }

   return result;
 }

 // name_offset: starting index of the name in libdl_info.strtab
 #define ELF32_SYM_INITIALIZER(name_offset, value, shndx) \
     { name_offset, \
       reinterpret_cast<Elf32_Addr>(value), \
       /* st_size */ 0, \
       ((shndx) == 0) ? 0 : (STB_GLOBAL << 4), \
       /* st_other */ 0, \
       shndx, \
     }

 #define ELF64_SYM_INITIALIZER(name_offset, value, shndx) \
     { name_offset, \
       ((shndx) == 0) ? 0 : (STB_GLOBAL << 4), \
       /* st_other */ 0, \
       shndx, \
       reinterpret_cast<Elf64_Addr>(value), \
       /* st_size */ 0, \
     }

 static const char ANDROID_LIBDL_STRTAB[] =
   // 0000000 00011111 111112 22222222 2333333 3333444444444455555555556666666 6667777777777888888888899999 99999
   // 0123456 78901234 567890 12345678 9012345 6789012345678901234567890123456 7890123456789012345678901234 56789
     "dlopen\0dlclose\0dlsym\0dlerror\0dladdr\0android_update_LD_LIBRARY_PATH\0android_get_LD_LIBRARY_PATH\0dl_it"
   // 00000000001 1111111112222222222 3333333333444444444455555555556666666666777 777777788888888889999999999
   // 01234567890 1234567890123456789 0123456789012345678901234567890123456789012 345678901234567890123456789
     "erate_phdr\0android_dlopen_ext\0android_set_application_target_sdk_version\0android_get_application_tar"
   // 0000000000111111 111122222222223333333333 4444444444555555555566666 6666677
   // 0123456789012345 678901234567890123456789 0123456789012345678901234 5678901
     "get_sdk_version\0android_init_namespaces\0android_create_namespace\0dlvsym\0"
 #if defined(__arm__)
   // 272
     "dl_unwind_find_exidx\0"
 #endif
     ;

 static ElfW(Sym) g_libdl_symtab[] = {
   // Total length of libdl_info.strtab, including trailing 0.
   // This is actually the STH_UNDEF entry. Technically, it's
   // supposed to have st_name == 0, but instead, it points to an index
   // in the strtab with a \0 to make iterating through the symtab easier.
   ELFW(SYM_INITIALIZER)(sizeof(ANDROID_LIBDL_STRTAB) - 1, nullptr, 0),
   ELFW(SYM_INITIALIZER)(  0, &dlopen, 1),
   ELFW(SYM_INITIALIZER)(  7, &dlclose, 1),
   ELFW(SYM_INITIALIZER)( 15, &dlsym, 1),
   ELFW(SYM_INITIALIZER)( 21, &dlerror, 1),
   ELFW(SYM_INITIALIZER)( 29, &dladdr, 1),
   ELFW(SYM_INITIALIZER)( 36, &android_update_LD_LIBRARY_PATH, 1),
   ELFW(SYM_INITIALIZER)( 67, &android_get_LD_LIBRARY_PATH, 1),
   ELFW(SYM_INITIALIZER)( 95, &dl_iterate_phdr, 1),
   ELFW(SYM_INITIALIZER)(111, &android_dlopen_ext, 1),
   ELFW(SYM_INITIALIZER)(130, &android_set_application_target_sdk_version, 1),
   ELFW(SYM_INITIALIZER)(173, &android_get_application_target_sdk_version, 1),
   ELFW(SYM_INITIALIZER)(216, &android_init_namespaces, 1),
   ELFW(SYM_INITIALIZER)(240, &android_create_namespace, 1),
   ELFW(SYM_INITIALIZER)(265, &dlvsym, 1),
 #if defined(__arm__)
   ELFW(SYM_INITIALIZER)(272, &dl_unwind_find_exidx, 1),
 #endif
 };

 // Fake out a hash table with a single bucket.
 //
 // A search of the hash table will look through g_libdl_symtab starting with index 1, then
 // use g_libdl_chains to find the next index to look at. g_libdl_chains should be set up to
 // walk through every element in g_libdl_symtab, and then end with 0 (sentinel value).
 //
 // That is, g_libdl_chains should look like { 0, 2, 3, ... N, 0 } where N is the number
 // of actual symbols, or nelems(g_libdl_symtab)-1 (since the first element of g_libdl_symtab is not
 // a real symbol). (See soinfo_elf_lookup().)
 //
 // Note that adding any new symbols here requires stubbing them out in libdl.
 static unsigned g_libdl_buckets[1] = { 1 };
 #if defined(__arm__)
 static unsigned g_libdl_chains[] = { 0, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 0 };
 #else
 static unsigned g_libdl_chains[] = { 0, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 0 };
 #endif

 static uint8_t __libdl_info_buf[sizeof(soinfo)] __attribute__((aligned(8)));
 static soinfo* __libdl_info = nullptr;

 extern android_namespace_t g_default_namespace;

 // This is used by the dynamic linker. Every process gets these symbols for free.
 soinfo* get_libdl_info() {
   if (__libdl_info == nullptr) {
     __libdl_info = new (__libdl_info_buf) soinfo(&g_default_namespace, "libdl.so", nullptr, 0, RTLD_GLOBAL);
     __libdl_info->flags_ |= FLAG_LINKED;
     __libdl_info->strtab_ = ANDROID_LIBDL_STRTAB;
     __libdl_info->symtab_ = g_libdl_symtab;
     __libdl_info->nbucket_ = sizeof(g_libdl_buckets)/sizeof(unsigned);
     __libdl_info->nchain_ = sizeof(g_libdl_chains)/sizeof(unsigned);
     __libdl_info->bucket_ = g_libdl_buckets;
     __libdl_info->chain_ = g_libdl_chains;
     __libdl_info->ref_count_ = 1;
     __libdl_info->strtab_size_ = sizeof(ANDROID_LIBDL_STRTAB);
     __libdl_info->local_group_root_ = __libdl_info;
     __libdl_info->soname_ = "libdl.so";
     __libdl_info->target_sdk_version_ = __ANDROID_API__;
     __libdl_info->generate_handle();
 #if defined(__work_around_b_24465209__)
     strlcpy(__libdl_info->old_name_, __libdl_info->soname_, sizeof(__libdl_info->old_name_));
 #endif
   }

   return __libdl_info;
 }
	/*
	* Copyright (C) 2007 The Android Open Source Project
	*
	* Licensed under the Apache License, Version 2.0 (the "License");
	* you may not use this file except in compliance with the License.
	* You may obtain a copy of the License at
	*
	* http://www.apache.org/licenses/LICENSE-2.0
	*
	* Unless required by applicable law or agreed to in writing, software
	* distributed under the License is distributed on an "AS IS" BASIS,
	* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
	* See the License for the specific language governing permissions and
	* limitations under the License.
	*/

	#include "linker.h"

	#include <pthread.h>
	#include <stdio.h>
	#include <stdlib.h>
	#include <string.h>
	#include <android/api-level.h>

	#include <bionic/pthread_internal.h>
	#include "private/bionic_tls.h"
	#include "private/ScopedPthreadMutexLocker.h"
	#include "private/ThreadLocalBuffer.h"

	/* This file hijacks the symbols stubbed out in libdl.so. */

	static pthread_mutex_t g_dl_mutex = PTHREAD_RECURSIVE_MUTEX_INITIALIZER_NP;

	static const char* __bionic_set_dlerror(char* new_value) {
	char dlerror_slot = &reinterpret_cast<char>(__get_tls())[TLS_SLOT_DLERROR];

	const char* old_value = *dlerror_slot;
	*dlerror_slot = new_value;
	return old_value;
	}

	static void __bionic_format_dlerror(const char* msg, const char* detail) {
	char* buffer = __get_thread()->dlerror_buffer;
	strlcpy(buffer, msg, __BIONIC_DLERROR_BUFFER_SIZE);
	if (detail != nullptr) {
	strlcat(buffer, ": ", __BIONIC_DLERROR_BUFFER_SIZE);
	strlcat(buffer, detail, __BIONIC_DLERROR_BUFFER_SIZE);
	}

	__bionic_set_dlerror(buffer);
	}

	const char* dlerror() {
	const char* old_value = __bionic_set_dlerror(nullptr);
	return old_value;
	}

	void android_get_LD_LIBRARY_PATH(char* buffer, size_t buffer_size) {
	ScopedPthreadMutexLocker locker(&g_dl_mutex);
	do_android_get_LD_LIBRARY_PATH(buffer, buffer_size);
	}

	void android_update_LD_LIBRARY_PATH(const char* ld_library_path) {
	ScopedPthreadMutexLocker locker(&g_dl_mutex);
	do_android_update_LD_LIBRARY_PATH(ld_library_path);
	}

	static void* dlopen_ext(const char* filename, int flags,
	const android_dlextinfo* extinfo, void* caller_addr) {
	ScopedPthreadMutexLocker locker(&g_dl_mutex);
	void* result = do_dlopen(filename, flags, extinfo, caller_addr);
	if (result == nullptr) {
	__bionic_format_dlerror("dlopen failed", linker_get_error_buffer());
	return nullptr;
	}
	return result;
	}

	void* android_dlopen_ext(const char* filename, int flags, const android_dlextinfo* extinfo) {
	void* caller_addr = __builtin_return_address(0);
	return dlopen_ext(filename, flags, extinfo, caller_addr);
	}

	void* dlopen(const char* filename, int flags) {
	void* caller_addr = __builtin_return_address(0);
	return dlopen_ext(filename, flags, nullptr, caller_addr);
	}

	void* dlsym_impl(void* handle, const char* symbol, const char* version, void* caller_addr) {
	ScopedPthreadMutexLocker locker(&g_dl_mutex);
	void* result;
	if (!do_dlsym(handle, symbol, version, caller_addr, &result)) {
	__bionic_format_dlerror(linker_get_error_buffer(), nullptr);
	return nullptr;
	}

	return result;
	}

	void* dlsym(void* handle, const char* symbol) {
	void* caller_addr = __builtin_return_address(0);
	return dlsym_impl(handle, symbol, nullptr, caller_addr);
	}

	void* dlvsym(void* handle, const char* symbol, const char* version) {
	void* caller_addr = __builtin_return_address(0);
	return dlsym_impl(handle, symbol, version, caller_addr);
	}

	int dladdr(const void* addr, Dl_info* info) {
	ScopedPthreadMutexLocker locker(&g_dl_mutex);
	return do_dladdr(addr, info);
	}

	int dlclose(void* handle) {
	ScopedPthreadMutexLocker locker(&g_dl_mutex);
	int result = do_dlclose(handle);
	if (result != 0) {
	__bionic_format_dlerror("dlclose failed", linker_get_error_buffer());
	}
	return result;
	}

	int dl_iterate_phdr(int (cb)(dl_phdr_info info, size_t size, void* data), void* data) {
	ScopedPthreadMutexLocker locker(&g_dl_mutex);
	return do_dl_iterate_phdr(cb, data);
	}

	void android_set_application_target_sdk_version(uint32_t target) {
	// lock to avoid modification in the middle of dlopen.
	ScopedPthreadMutexLocker locker(&g_dl_mutex);
	set_application_target_sdk_version(target);
	}

	uint32_t android_get_application_target_sdk_version() {
	return get_application_target_sdk_version();
	}

	bool android_init_namespaces(const char* public_ns_sonames,
	const char* anon_ns_library_path) {
	ScopedPthreadMutexLocker locker(&g_dl_mutex);
	bool success = init_namespaces(public_ns_sonames, anon_ns_library_path);
	if (!success) {
	__bionic_format_dlerror("android_init_namespaces failed", linker_get_error_buffer());
	}

	return success;
	}

	android_namespace_t* android_create_namespace(const char* name,
	const char* ld_library_path,
	const char* default_library_path,
	uint64_t type,
	const char* permitted_when_isolated_path,
	android_namespace_t* parent_namespace) {
	void* caller_addr = __builtin_return_address(0);
	ScopedPthreadMutexLocker locker(&g_dl_mutex);

	android_namespace_t* result = create_namespace(caller_addr,
	name,
	ld_library_path,
	default_library_path,
	type,
	permitted_when_isolated_path,
	parent_namespace);

	if (result == nullptr) {
	__bionic_format_dlerror("android_create_namespace failed", linker_get_error_buffer());
	}

	return result;
	}

	// name_offset: starting index of the name in libdl_info.strtab
	#define ELF32_SYM_INITIALIZER(name_offset, value, shndx) \
	{ name_offset, \
	reinterpret_cast<Elf32_Addr>(value), \
	/* st_size */ 0, \
	((shndx) == 0) ? 0 : (STB_GLOBAL << 4), \
	/* st_other */ 0, \
	shndx, \
	}

	#define ELF64_SYM_INITIALIZER(name_offset, value, shndx) \
	{ name_offset, \
	((shndx) == 0) ? 0 : (STB_GLOBAL << 4), \
	/* st_other */ 0, \
	shndx, \
	reinterpret_cast<Elf64_Addr>(value), \
	/* st_size */ 0, \
	}

	static const char ANDROID_LIBDL_STRTAB[] =
	// 0000000 00011111 111112 22222222 2333333 3333444444444455555555556666666 6667777777777888888888899999 99999
	// 0123456 78901234 567890 12345678 9012345 6789012345678901234567890123456 7890123456789012345678901234 56789
	"dlopen\0dlclose\0dlsym\0dlerror\0dladdr\0android_update_LD_LIBRARY_PATH\0android_get_LD_LIBRARY_PATH\0dl_it"
	// 00000000001 1111111112222222222 3333333333444444444455555555556666666666777 777777788888888889999999999
	// 01234567890 1234567890123456789 0123456789012345678901234567890123456789012 345678901234567890123456789
	"erate_phdr\0android_dlopen_ext\0android_set_application_target_sdk_version\0android_get_application_tar"
	// 0000000000111111 111122222222223333333333 4444444444555555555566666 6666677
	// 0123456789012345 678901234567890123456789 0123456789012345678901234 5678901
	"get_sdk_version\0android_init_namespaces\0android_create_namespace\0dlvsym\0"
	#if defined(__arm__)
	// 272
	"dl_unwind_find_exidx\0"
	#endif
	;

	static ElfW(Sym) g_libdl_symtab[] = {
	// Total length of libdl_info.strtab, including trailing 0.
	// This is actually the STH_UNDEF entry. Technically, it's
	// supposed to have st_name == 0, but instead, it points to an index
	// in the strtab with a \0 to make iterating through the symtab easier.
	ELFW(SYM_INITIALIZER)(sizeof(ANDROID_LIBDL_STRTAB) - 1, nullptr, 0),
	ELFW(SYM_INITIALIZER)( 0, &dlopen, 1),
	ELFW(SYM_INITIALIZER)( 7, &dlclose, 1),
	ELFW(SYM_INITIALIZER)( 15, &dlsym, 1),
	ELFW(SYM_INITIALIZER)( 21, &dlerror, 1),
	ELFW(SYM_INITIALIZER)( 29, &dladdr, 1),
	ELFW(SYM_INITIALIZER)( 36, &android_update_LD_LIBRARY_PATH, 1),
	ELFW(SYM_INITIALIZER)( 67, &android_get_LD_LIBRARY_PATH, 1),
	ELFW(SYM_INITIALIZER)( 95, &dl_iterate_phdr, 1),
	ELFW(SYM_INITIALIZER)(111, &android_dlopen_ext, 1),
	ELFW(SYM_INITIALIZER)(130, &android_set_application_target_sdk_version, 1),
	ELFW(SYM_INITIALIZER)(173, &android_get_application_target_sdk_version, 1),
	ELFW(SYM_INITIALIZER)(216, &android_init_namespaces, 1),
	ELFW(SYM_INITIALIZER)(240, &android_create_namespace, 1),
	ELFW(SYM_INITIALIZER)(265, &dlvsym, 1),
	#if defined(__arm__)
	ELFW(SYM_INITIALIZER)(272, &dl_unwind_find_exidx, 1),
	#endif
	};

	// Fake out a hash table with a single bucket.
	//
	// A search of the hash table will look through g_libdl_symtab starting with index 1, then
	// use g_libdl_chains to find the next index to look at. g_libdl_chains should be set up to
	// walk through every element in g_libdl_symtab, and then end with 0 (sentinel value).
	//
	// That is, g_libdl_chains should look like { 0, 2, 3, ... N, 0 } where N is the number
	// of actual symbols, or nelems(g_libdl_symtab)-1 (since the first element of g_libdl_symtab is not
	// a real symbol). (See soinfo_elf_lookup().)
	//
	// Note that adding any new symbols here requires stubbing them out in libdl.
	static unsigned g_libdl_buckets[1] = { 1 };
	#if defined(__arm__)
	static unsigned g_libdl_chains[] = { 0, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 0 };
	#else
	static unsigned g_libdl_chains[] = { 0, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 0 };
	#endif

	static uint8_t __libdl_info_buf[sizeof(soinfo)] __attribute__((aligned(8)));
	static soinfo* __libdl_info = nullptr;

	extern android_namespace_t g_default_namespace;

	// This is used by the dynamic linker. Every process gets these symbols for free.
	soinfo* get_libdl_info() {
	if (__libdl_info == nullptr) {
	__libdl_info = new (__libdl_info_buf) soinfo(&g_default_namespace, "libdl.so", nullptr, 0, RTLD_GLOBAL);
	__libdl_info->flags_ \|= FLAG_LINKED;
	__libdl_info->strtab_ = ANDROID_LIBDL_STRTAB;
	__libdl_info->symtab_ = g_libdl_symtab;
	__libdl_info->nbucket_ = sizeof(g_libdl_buckets)/sizeof(unsigned);
	__libdl_info->nchain_ = sizeof(g_libdl_chains)/sizeof(unsigned);
	__libdl_info->bucket_ = g_libdl_buckets;
	__libdl_info->chain_ = g_libdl_chains;
	__libdl_info->ref_count_ = 1;
	__libdl_info->strtab_size_ = sizeof(ANDROID_LIBDL_STRTAB);
	__libdl_info->local_group_root_ = __libdl_info;
	__libdl_info->soname_ = "libdl.so";
	__libdl_info->target_sdk_version_ = __ANDROID_API__;
	__libdl_info->generate_handle();
	#if defined(__work_around_b_24465209__)
	strlcpy(__libdl_info->old_name_, __libdl_info->soname_, sizeof(__libdl_info->old_name_));
	#endif
	}

	return __libdl_info;
	}