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// Copyright 2017 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 "src/main/tools/process-wrapper-legacy.h"
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <sys/resource.h>
#include <sys/stat.h>
#include <sys/time.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <unistd.h>
#include <vector>
#include "src/main/tools/logging.h"
#include "src/main/tools/process-tools.h"
#include "src/main/tools/process-wrapper-options.h"
#include "src/main/tools/process-wrapper.h"
pid_t LegacyProcessWrapper::child_pid = 0;
volatile sig_atomic_t LegacyProcessWrapper::last_signal = 0;
void LegacyProcessWrapper::RunCommand() {
SpawnChild();
WaitForChild();
}
void LegacyProcessWrapper::SpawnChild() {
child_pid = fork();
if (child_pid < 0) {
DIE("fork");
} else if (child_pid == 0) {
// In child.
if (setsid() < 0) {
DIE("setsid");
}
ClearSignalMask();
// Force umask to include read and execute for everyone, to make output
// permissions predictable.
umask(022);
// Does not return unless something went wrong.
if (execvp(opt.args[0], opt.args.data()) < 0) {
DIE("execvp(%s, ...)", opt.args[0]);
}
}
}
void LegacyProcessWrapper::WaitForChild() {
// Set up a signal handler which kills all subprocesses when the given signal
// is triggered.
InstallSignalHandler(SIGALRM, OnSignal);
InstallSignalHandler(SIGTERM, OnSignal);
InstallSignalHandler(SIGINT, OnSignal);
if (opt.timeout_secs > 0) {
SetTimeout(opt.timeout_secs);
}
int status;
if (!opt.stats_path.empty()) {
struct rusage child_rusage;
status = WaitChildWithRusage(child_pid, &child_rusage);
WriteStatsToFile(&child_rusage, opt.stats_path);
} else {
status = WaitChild(child_pid);
}
// The child is done for, but may have grandchildren that we still have to
// kill.
kill(-child_pid, SIGKILL);
if (last_signal > 0) {
// Don't trust the exit code if we got a timeout or signal.
InstallDefaultSignalHandler(last_signal);
raise(last_signal);
} else if (WIFEXITED(status)) {
exit(WEXITSTATUS(status));
} else {
int sig = WTERMSIG(status);
InstallDefaultSignalHandler(sig);
raise(sig);
}
}
// Called when timeout or signal occurs.
void LegacyProcessWrapper::OnSignal(int sig) {
last_signal = sig;
if (sig == SIGALRM) {
// SIGALRM represents a timeout, so we should give the process a bit of time
// to die gracefully if it needs it.
KillEverything(child_pid, true, opt.kill_delay_secs);
} else {
// Signals should kill the process quickly, as it's typically blocking the
// return of the prompt after a user hits "Ctrl-C".
KillEverything(child_pid, false, opt.kill_delay_secs);
}
}
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