1ccdb7d92a
... if they are not available. Use weak symbols and do not call the following functions when they are not defined: * android_dlopen_ext * android_get_exported_namespace Test: links Test: boots Change-Id: I653548bac61a0eba001f72bab969b5b858bd1553
70 lines
2.4 KiB
C
70 lines
2.4 KiB
C
/*
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* Copyright (C) 2017 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 "linker.h"
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#include <android/dlext.h>
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#include <dlfcn.h>
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#define LOG_TAG "vndksupport"
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#include <log/log.h>
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__attribute__((weak)) extern struct android_namespace_t* android_get_exported_namespace(const char*);
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__attribute__((weak)) extern void* android_dlopen_ext(const char*, int, const android_dlextinfo*);
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static const char* namespace_name = NULL;
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static struct android_namespace_t* get_vendor_namespace() {
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const char* namespace_names[] = {"sphal", "default", NULL};
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static struct android_namespace_t* vendor_namespace = NULL;
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if (vendor_namespace == NULL) {
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int name_idx = 0;
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while (namespace_names[name_idx] != NULL) {
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if (android_get_exported_namespace != NULL) {
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vendor_namespace = android_get_exported_namespace(namespace_names[name_idx]);
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}
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if (vendor_namespace != NULL) {
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namespace_name = namespace_names[name_idx];
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break;
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}
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name_idx++;
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}
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}
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return vendor_namespace;
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}
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void* android_load_sphal_library(const char* name, int flag) {
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struct android_namespace_t* vendor_namespace = get_vendor_namespace();
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if (vendor_namespace != NULL) {
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const android_dlextinfo dlextinfo = {
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.flags = ANDROID_DLEXT_USE_NAMESPACE, .library_namespace = vendor_namespace,
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};
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void* handle = NULL;
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if (android_dlopen_ext != NULL) {
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handle = android_dlopen_ext(name, flag, &dlextinfo);
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}
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if (!handle) {
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ALOGE("Could not load %s from %s namespace: %s.", name, namespace_name, dlerror());
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}
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return handle;
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} else {
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ALOGD("Loading %s from current namespace instead of sphal namespace.", name);
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return dlopen(name, flag);
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}
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}
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int android_unload_sphal_library(void* handle) {
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return dlclose(handle);
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}
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