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
23 using std::chrono::steady_clock;
24
25 namespace {
convertDurationToMillis(const steady_clock::time_point & start,const steady_clock::time_point & end)26 int 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 }
33 namespace android {
34 namespace wificond {
35 namespace tests {
36 namespace integration {
37
BinderDispatcher()38 BinderDispatcher::BinderDispatcher()
39 : event_dispatcher_(new LooperBackedEventLoop()),
40 binder_fd_(-1),
41 needs_init_(true),
42 was_interrupted_(false) {}
43
~BinderDispatcher()44 BinderDispatcher::~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
DispatchFor(int timeout_millis)56 bool 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
InterruptDispatch()73 void BinderDispatcher::InterruptDispatch() {
74 was_interrupted_ = true;
75 }
76
Init()77 void 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
OnBinderEvent(int)96 void BinderDispatcher::OnBinderEvent(int /* fd */) {
97 android::IPCThreadState::self()->handlePolledCommands();
98 }
99 } // namespace integration
100 } // namespace tests
101 } // namespace wificond
102 } // namespace android
103