| /* |
| * Copyright (C) 2015 The Android Open Source Project |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| #include <brillo/binder_watcher.h> |
| |
| #include <base/bind.h> |
| #include <base/logging.h> |
| #include <binder/IPCThreadState.h> |
| #include <binder/ProcessState.h> |
| |
| using android::IPCThreadState; |
| using android::ProcessState; |
| |
| namespace { |
| // Called from the message loop whenever the binder file descriptor is ready. |
| void OnBinderReadReady() { |
| IPCThreadState::self()->handlePolledCommands(); |
| } |
| } // namespace |
| |
| namespace brillo { |
| |
| BinderWatcher::BinderWatcher(MessageLoop* message_loop) |
| : message_loop_(message_loop) {} |
| |
| BinderWatcher::BinderWatcher() : message_loop_(nullptr) {} |
| |
| BinderWatcher::~BinderWatcher() { |
| if (task_id_ != MessageLoop::kTaskIdNull) |
| message_loop_->CancelTask(task_id_); |
| } |
| |
| bool BinderWatcher::Init() { |
| if (!message_loop_) |
| message_loop_ = MessageLoop::current(); |
| if (!message_loop_) { |
| LOG(ERROR) << "Must initialize a brillo::MessageLoop to use BinderWatcher"; |
| return false; |
| } |
| |
| int binder_fd = -1; |
| ProcessState::self()->setThreadPoolMaxThreadCount(0); |
| IPCThreadState::self()->disableBackgroundScheduling(true); |
| int err = IPCThreadState::self()->setupPolling(&binder_fd); |
| if (err != 0) { |
| LOG(ERROR) << "Error setting up binder polling: " |
| << logging::SystemErrorCodeToString(err); |
| return false; |
| } |
| if (binder_fd < 0) { |
| LOG(ERROR) << "Invalid binder FD " << binder_fd; |
| return false; |
| } |
| VLOG(1) << "Got binder FD " << binder_fd; |
| |
| task_id_ = message_loop_->WatchFileDescriptor( |
| FROM_HERE, |
| binder_fd, |
| MessageLoop::kWatchRead, |
| true /* persistent */, |
| base::Bind(&OnBinderReadReady)); |
| if (task_id_ == MessageLoop::kTaskIdNull) { |
| LOG(ERROR) << "Failed to watch binder FD"; |
| return false; |
| } |
| return true; |
| } |
| |
| } // namespace brillo |