subprocess_posix.cc | Explore in Territory

/*
 * Copyright (C) 2020 The Android Open Source Project
 *
 * 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 "perfetto/ext/base/subprocess.h"

#include "perfetto/base/build_config.h"

#if PERFETTO_BUILDFLAG(PERFETTO_OS_LINUX) ||   \
    PERFETTO_BUILDFLAG(PERFETTO_OS_ANDROID) || \
    PERFETTO_BUILDFLAG(PERFETTO_OS_APPLE)

#include <fcntl.h>
#include <poll.h>
#include <signal.h>
#include <stdio.h>
#include <sys/resource.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <unistd.h>

#include <algorithm>
#include <thread>
#include <tuple>

#if PERFETTO_BUILDFLAG(PERFETTO_OS_LINUX) || \
    PERFETTO_BUILDFLAG(PERFETTO_OS_ANDROID)
#include <sys/prctl.h>
#endif

#include "perfetto/base/logging.h"
#include "perfetto/base/time.h"
#include "perfetto/ext/base/utils.h"

// In MacOS this is not defined in any header.
extern "C" char** environ;

namespace perfetto {
namespace base {

namespace {

struct ChildProcessArgs { … };

// Don't add any dynamic allocation in this function. This will be invoked
// under a fork(), potentially in a state where the allocator lock is held.
void __attribute__((noreturn)) ChildProcess(ChildProcessArgs* args) { … }

}  // namespace

// static
const int Subprocess::kTimeoutSignal = …;

void Subprocess::Start() { … }

Subprocess::Status Subprocess::Poll() { … }

// |timeout_ms| semantic:
//   -1: Block indefinitely.
//    0: Don't block, return immediately.
//   >0: Block for at most X ms.
// Returns:
//  True: Read at least one fd (so there might be more queued).
//  False: if all fds reached quiescent (no data to read/write).
bool Subprocess::PollInternal(int poll_timeout_ms) { … }

bool Subprocess::Wait(int timeout_ms) { … }

void Subprocess::TryReadExitStatus() { … }

// If the stidn pipe is still open, push input data and close it at the end.
void Subprocess::TryPushStdin() { … }

void Subprocess::TryReadStdoutAndErr() { … }

void Subprocess::KillAndWaitForTermination(int sig_num) { … }

}  // namespace base
}  // namespace perfetto

#endif  // PERFETTO_OS_LINUX || PERFETTO_OS_ANDROID || PERFETTO_OS_APPLE
chromium/third_party/perfetto/src/base/subprocess_posix.cc
