/*
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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 <brillo/binder_watcher.h>
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#include <base/bind.h>
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#include <base/logging.h>
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#include <binder/IPCThreadState.h>
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#include <binder/ProcessState.h>
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using android::IPCThreadState;
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using android::ProcessState;
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namespace {
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// Called from the message loop whenever the binder file descriptor is ready.
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void OnBinderReadReady() {
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IPCThreadState::self()->handlePolledCommands();
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}
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} // namespace
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namespace brillo {
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BinderWatcher::BinderWatcher(MessageLoop* message_loop)
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: message_loop_(message_loop) {}
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BinderWatcher::BinderWatcher() : message_loop_(nullptr) {}
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BinderWatcher::~BinderWatcher() {
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if (task_id_ != MessageLoop::kTaskIdNull)
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message_loop_->CancelTask(task_id_);
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}
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bool BinderWatcher::Init() {
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if (!message_loop_)
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message_loop_ = MessageLoop::current();
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if (!message_loop_) {
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LOG(ERROR) << "Must initialize a brillo::MessageLoop to use BinderWatcher";
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return false;
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}
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int binder_fd = -1;
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ProcessState::self()->setThreadPoolMaxThreadCount(0);
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IPCThreadState::self()->disableBackgroundScheduling(true);
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int err = IPCThreadState::self()->setupPolling(&binder_fd);
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if (err != 0) {
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LOG(ERROR) << "Error setting up binder polling: "
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<< logging::SystemErrorCodeToString(err);
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return false;
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}
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if (binder_fd < 0) {
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LOG(ERROR) << "Invalid binder FD " << binder_fd;
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return false;
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}
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VLOG(1) << "Got binder FD " << binder_fd;
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task_id_ = message_loop_->WatchFileDescriptor(
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FROM_HERE,
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binder_fd,
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MessageLoop::kWatchRead,
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true /* persistent */,
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base::Bind(&OnBinderReadReady));
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if (task_id_ == MessageLoop::kTaskIdNull) {
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LOG(ERROR) << "Failed to watch binder FD";
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return false;
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}
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return true;
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}
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} // namespace brillo
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