8c733615aa
Also: remove an obsolete comment from linker_test.cpp. The test program is at /data/nativetest[64]/libvndksupport-tests/libvndksupport-tests, which may will be in the system or legacy configuration, and either the "sphal" or "default" namespace will be visible. Bug: none Test: run libvndksupport-tests, device boots Change-Id: I5e33e5bf1402a0368e046b03827c216789b02c96
96 lines
3.1 KiB
C++
96 lines
3.1 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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#define LOG_TAG "vndksupport"
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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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#include <log/log.h>
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#include <sys/types.h>
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#include <unistd.h>
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#include <initializer_list>
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__attribute__((weak)) extern "C" android_namespace_t* android_get_exported_namespace(const char*);
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__attribute__((weak)) extern "C" void* android_dlopen_ext(const char*, int,
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const android_dlextinfo*);
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namespace {
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struct VendorNamespace {
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android_namespace_t* ptr = nullptr;
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const char* name = nullptr;
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};
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} // anonymous namespace
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static VendorNamespace get_vendor_namespace() {
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static VendorNamespace result = ([] {
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for (const char* name : {"sphal", "default"}) {
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if (android_get_exported_namespace != nullptr) {
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if (android_namespace_t* ns = android_get_exported_namespace(name)) {
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return VendorNamespace{ns, name};
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}
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}
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}
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return VendorNamespace{};
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})();
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return result;
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}
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int android_is_in_vendor_process() {
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// Special case init, since when init runs, ld.config.<ver>.txt hasn't been
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// loaded (sysprop service isn't up for init to know <ver>).
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if (getpid() == 1) {
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return 0;
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}
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if (android_get_exported_namespace == nullptr) {
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ALOGD("android_get_exported_namespace() not available. Assuming system process.");
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return 0;
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}
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// In vendor process, 'vndk' namespace is not visible, whereas in system
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// process, it is.
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return android_get_exported_namespace("vndk") == nullptr;
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}
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void* android_load_sphal_library(const char* name, int flag) {
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VendorNamespace vendor_namespace = get_vendor_namespace();
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if (vendor_namespace.ptr != nullptr) {
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const android_dlextinfo dlextinfo = {
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.flags = ANDROID_DLEXT_USE_NAMESPACE,
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.library_namespace = vendor_namespace.ptr,
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};
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void* handle = nullptr;
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if (android_dlopen_ext != nullptr) {
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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, vendor_namespace.name,
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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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