libdl/libdl.c

/*
 * 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 <dlfcn.h>
#include <link.h>
#include <stdlib.h>
#include <stdbool.h>
#include <android/dlext.h>

// These are stubs for functions that are actually defined
// in the dynamic linker and hijacked at runtime.

void* dlopen(const char* filename __unused, int flag __unused) { return 0; }

char* dlerror(void) { return 0; }

void* dlsym(void* handle __unused, const char* symbol __unused) { return 0; }

void* dlvsym(void* handle __unused, const char* symbol __unused, const char* version __unused) {
  return 0;
}

int dladdr(const void* addr __unused, Dl_info* info __unused) { return 0; }

int dlclose(void* handle __unused) { return 0; }

#if defined(__arm__)
_Unwind_Ptr dl_unwind_find_exidx(_Unwind_Ptr pc __unused, int* pcount __unused) { return 0; }
#endif

int dl_iterate_phdr(int (*cb)(struct dl_phdr_info* info, size_t size, void* data) __unused,
                    void* data __unused) {
  return 0;
}

void android_get_LD_LIBRARY_PATH(char* buffer __unused, size_t buffer_size __unused) { }
void android_update_LD_LIBRARY_PATH(const char* ld_library_path __unused) { }

void* android_dlopen_ext(const char* filename __unused, int flag __unused,
                         const android_dlextinfo* extinfo __unused) {
  return 0;
}

void android_set_application_target_sdk_version(uint32_t target __unused) { }
uint32_t android_get_application_target_sdk_version() { return 0; }

bool android_init_namespaces(const char* public_ns_sonames __unused,
                             const char* anon_ns_library_path __unused) {
  return false;
}

struct android_namespace_t* android_create_namespace(const char* name __unused,
                                                     const char* ld_library_path __unused,
                                                     const char* default_library_path __unused,
                                                     uint64_t type __unused,
                                                     const char* permitted_when_isolated_path __unused) {
  return 0;
}

void android_dlwarning(void* obj, void (*f)(void*, const char*)) { f(obj, 0); }