58 lines
2.2 KiB
C++
58 lines
2.2 KiB
C++
/*
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* Copyright (C) 2014 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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#ifdef LIBC_STATIC
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#error NetdClient.cpp should NOT be included in static libc builds.
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#endif
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#include "private/libc_logging.h"
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#include "private/NetdClientDispatch.h"
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#include <dlfcn.h>
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#include <pthread.h>
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template <typename FunctionType>
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static void netdClientInitFunction(void* handle, const char* symbol, FunctionType* function) {
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typedef void (*InitFunctionType)(FunctionType*);
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InitFunctionType initFunction = reinterpret_cast<InitFunctionType>(dlsym(handle, symbol));
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if (initFunction != NULL) {
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initFunction(function);
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}
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}
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static void netdClientInitImpl() {
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void* netdClientHandle = dlopen("libnetd_client.so", RTLD_NOW);
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if (netdClientHandle == NULL) {
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// If the library is not available, it's not an error. We'll just use
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// default implementations of functions that it would've overridden.
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return;
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}
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netdClientInitFunction(netdClientHandle, "netdClientInitAccept4",
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&__netdClientDispatch.accept4);
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netdClientInitFunction(netdClientHandle, "netdClientInitConnect",
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&__netdClientDispatch.connect);
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netdClientInitFunction(netdClientHandle, "netdClientInitNetIdForResolv",
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&__netdClientDispatch.netIdForResolv);
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netdClientInitFunction(netdClientHandle, "netdClientInitSocket", &__netdClientDispatch.socket);
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}
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static pthread_once_t netdClientInitOnce = PTHREAD_ONCE_INIT;
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extern "C" __LIBC_HIDDEN__ void netdClientInit() {
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if (pthread_once(&netdClientInitOnce, netdClientInitImpl)) {
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__libc_format_log(ANDROID_LOG_ERROR, "netdClient", "Failed to initialize netd_client");
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}
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}
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