1/*
2 * Copyright (C) 2016 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *      http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17#include <ctime>
18
19#include <private/binder/Static.h>
20
21#include "binder_dispatcher.h"
22
23using std::chrono::steady_clock;
24
25namespace {
26int convertDurationToMillis(const steady_clock::time_point& start,
27                            const steady_clock::time_point& end) {
28  return static_cast<int>(
29      std::chrono::duration_cast<std::chrono::milliseconds>(end - start)
30          .count());
31}
32}
33namespace android {
34namespace wificond {
35namespace tests {
36namespace integration {
37
38BinderDispatcher::BinderDispatcher()
39    : event_dispatcher_(new LooperBackedEventLoop()),
40      binder_fd_(-1),
41      needs_init_(true),
42      was_interrupted_(false) {}
43
44BinderDispatcher::~BinderDispatcher() {
45  // This is ugly! We want to cleanup the binder driver state at
46  // the end of each test (if binder driver was initialized during test).
47  // Destroying the instance of |ProcessState| should trigger the cleanup
48  // of the binder fd for this process. So, the next test will reinitialize
49  // a new instance of |ProcessState| and a new binder fd.
50  if (!needs_init_) {
51    event_dispatcher_->StopWatchFileDescriptor(binder_fd_);
52    gProcess.clear();
53  }
54}
55
56bool BinderDispatcher::DispatchFor(int timeout_millis) {
57  // Initialize the looper and binder if not already done.
58  if (needs_init_) {
59    Init();
60  }
61
62  was_interrupted_ = false;
63  steady_clock::time_point start_time = steady_clock::now();
64  int millis_left = timeout_millis;
65  do {
66    event_dispatcher_->PollForOne(millis_left);
67    millis_left = timeout_millis -
68                  convertDurationToMillis(start_time, steady_clock::now());
69  } while (millis_left > 0 && !was_interrupted_);
70  return was_interrupted_;
71}
72
73void BinderDispatcher::InterruptDispatch() {
74  was_interrupted_ = true;
75}
76
77void BinderDispatcher::Init() {
78  // Initilize the binder fd for polling.
79  android::ProcessState::self()->setThreadPoolMaxThreadCount(0);
80  android::IPCThreadState::self()->disableBackgroundScheduling(true);
81  int err = android::IPCThreadState::self()->setupPolling(&binder_fd_);
82  CHECK_EQ(err, 0) << "Error setting up binder polling: " << strerror(-err);
83  CHECK_GE(binder_fd_, 0) << "Invalid binder FD: " << binder_fd_;
84
85  auto binder_event_handler =
86      std::bind(&BinderDispatcher::OnBinderEvent, this, std::placeholders::_1);
87  // Add the binder fd to the looper watch list.
88  CHECK(event_dispatcher_->WatchFileDescriptor(
89      binder_fd_,
90      android::wificond::EventLoop::kModeInput,
91      binder_event_handler))
92      << "Failed to watch binder FD";
93  needs_init_ = false;
94}
95
96void BinderDispatcher::OnBinderEvent(int /* fd */) {
97  android::IPCThreadState::self()->handlePolledCommands();
98}
99}  // namespace integration
100}  // namespace tests
101}  // namespace wificond
102}  // namespace android
103