blob: 6a0a121900f4b2bc5ea8bc5bb4da5ffd9acd3dee [file] [log] [blame]
// Copyright 2019 The Bazel Authors. All rights reserved.
//
// 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 <signal.h>
#include <sys/prctl.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <unistd.h>
#include "src/main/tools/process-tools.h"
#include "googlemock/include/gmock/gmock.h"
#include "googletest/include/gtest/gtest.h"
namespace {
class TerminateAndWaitForAllTest : public testing::Test {
void SetUp(void) override {
// TerminateAndWaitForAll requires the caller to have enabled the child
// subreaper feature before spawning any processes.
ASSERT_NE(prctl(PR_SET_CHILD_SUBREAPER, 1, 0, 0, 0), -1);
}
};
TEST_F(TerminateAndWaitForAllTest, TestOnlyLeader) {
const pid_t pid = fork();
ASSERT_NE(pid, -1);
if (pid == 0) {
setpgid(0, getpid());
sleep(30);
_exit(0);
}
setpgid(pid, pid);
kill(pid, SIGKILL); // Abort sleep to finish test quickly.
ASSERT_NE(TerminateAndWaitForAll(pid), -1);
ASSERT_EQ(waitpid(pid, nullptr, 0), -1);
}
TEST_F(TerminateAndWaitForAllTest, TestOutsideOfGroup) {
int fds[2];
ASSERT_NE(pipe(fds), -1);
const size_t nprocs = 32;
pid_t pid = fork();
ASSERT_NE(pid, -1);
if (pid == 0) {
setpgid(0, getpid());
close(fds[0]);
// Spawn a bunch of subprocesses and report their PIDs to the test before
// exiting.
for (size_t i = 0; i < nprocs; i++) {
const pid_t subpid = fork();
if (subpid == -1) {
abort();
} else if (subpid == 0) {
close(fds[1]);
// Keep some subprocesses in the process group and make others escape.
if (i % 2 == 0) {
setsid();
}
// Sleep for a very long amount of time to ensure we actually wait for
// and terminate processes in the process group.
sleep(10000);
_exit(0);
}
if (write(fds[1], &subpid, sizeof(subpid)) != sizeof(subpid)) {
abort();
}
}
close(fds[1]);
_exit(0);
}
setpgid(pid, pid);
// Collect the PIDs of all subprocesses (except for the leader).
close(fds[1]);
pid_t pids[nprocs];
for (size_t i = 0; i < nprocs; i++) {
ASSERT_EQ(read(fds[0], &pids[i], sizeof(pids[i])), sizeof(pids[i]));
}
close(fds[0]);
ASSERT_NE(waitpid(pid, nullptr, 0), -1);
ASSERT_NE(TerminateAndWaitForAll(pid), -1);
for (size_t i = 0; i < nprocs; i++) {
// This check is racy: some other process might have reclaimed the PID of
// the process we already terminated. But it's very unlikely because the
// kernel tries very hard to not reassign PIDs too quickly.
ASSERT_EQ(kill(pids[i], 0), -1);
}
}
} // namespace