1 /*
2  * Copyright 2019 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 <unistd.h>
18 
19 #include <iostream>
20 
21 #include <wakelock/wakelock.h>
22 
23 static constexpr const char *gWakeLockName = "block_suspend";
24 
usage()25 static void usage() {
26     std::cout << "Usage: block_suspend\n"
27               << "Prevent device from suspending indefinitely. "
28               << "Process must be killed to unblock suspend.\n";
29 }
30 
main(int argc,char **)31 int main(int argc, char ** /* argv */) {
32     if (argc > 1) {
33         usage();
34         return 0;
35     }
36 
37     auto wl = android::wakelock::WakeLock::tryGet(gWakeLockName);  // RAII object
38     if (!wl.has_value()) {
39         return EXIT_FAILURE;
40     }
41 
42     while (true) { sleep(1000000); };
43     std::abort();  // should never reach here
44     return 0;
45 }
46