/*
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* Copyright (C) 2015 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include <dlfcn.h>
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static const char* g_local_string = "This string is local to root library";
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extern "C" const char* g_private_extern_string;
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extern "C" const char* g_public_extern_string;
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// This is resolved only if public library is in the same namespace as
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// the root one. It should remain unresolved if looking up for public library
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// crosses namespace boundary.
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//
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// Defined in libnstest_public_internal.so on which libnstest_public.so
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// depends on
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extern "C" const char* __attribute__((weak)) internal_extern_string();
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bool g_dlopened = false;
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extern "C" const char* ns_get_local_string() {
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return g_local_string;
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}
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extern "C" const char* ns_get_private_extern_string() {
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return g_private_extern_string;
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}
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extern "C" const char* ns_get_public_extern_string() {
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return g_public_extern_string;
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}
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extern "C" const char* ns_get_internal_extern_string() {
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if (internal_extern_string != nullptr) {
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return internal_extern_string();
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} else {
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return nullptr;
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}
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}
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extern "C" const char* ns_get_dlopened_string() {
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void* handle = dlopen("libnstest_dlopened.so", RTLD_NOW | RTLD_GLOBAL);
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if (handle == nullptr) {
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return nullptr;
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}
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const char** result = static_cast<const char**>(dlsym(handle, "g_private_dlopened_string"));
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if (result == nullptr) {
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return nullptr;
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} else {
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g_dlopened = true;
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}
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return *result;
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}
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