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/*
* 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
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