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82 lines
2.3 KiB
82 lines
2.3 KiB
/* |
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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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