2 * Copyright 2013 Facebook, Inc.
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
8 * http://www.apache.org/licenses/LICENSE-2.0
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.
17 // This is a helper for the parentDeathSignal test in SubprocessTest.cpp.
19 // Basically, we create two processes, a parent and a child, and set the
20 // child to receive SIGUSR1 when the parent exits. We set the child to
21 // create a file when that happens. The child then kills the parent; the test
22 // will verify that the file actually gets created, which means that everything
23 // worked as intended.
25 #include <sys/types.h>
31 #include <gflags/gflags.h>
32 #include <glog/logging.h>
34 #include "folly/Conv.h"
35 #include "folly/Subprocess.h"
37 using folly::Subprocess;
39 DEFINE_bool(child, false, "");
42 constexpr int kSignal = SIGUSR1;
43 volatile bool caught = false;
45 void signalHandler(int sig) {
54 void runChild(const char* file) {
56 sa.sa_handler = signalHandler;
57 sigemptyset(&sa.sa_mask);
59 CHECK_ERR(sigaction(kSignal, &sa, nullptr));
61 // Kill the parent, wait for our signal.
62 CHECK_ERR(kill(getppid(), SIGKILL));
68 // Signal completion by creating the file
69 CHECK_ERR(creat(file, 0600));
72 void runParent(const char* file) {
73 std::vector<std::string> args {"/proc/self/exe", "--child", file};
76 Subprocess::Options().parentDeathSignal(kSignal));
77 CHECK(proc.poll().running());
79 // The child will kill us.
85 int main(int argc, char *argv[]) {
86 google::ParseCommandLineFlags(&argc, &argv, true);