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// Copyright 2012 Google Inc. 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
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// See the License for the specific language governing permissions and
// limitations under the License.
#include <string>
#include <vector>
#include <queue>
using namespace std;
#ifdef _WIN32
#include <windows.h>
#include <signal.h>
// ppoll() exists on FreeBSD, but only on newer versions.
#ifdef __FreeBSD__
# include <sys/param.h>
# if defined USE_PPOLL && __FreeBSD_version < 1002000
# undef USE_PPOLL
# endif
#include "exit_status.h"
/// Subprocess wraps a single async subprocess. It is entirely
/// passive: it expects the caller to notify it when its fds are ready
/// for reading, as well as call Finish() to reap the child once done()
/// is true.
struct Subprocess {
/// Returns ExitSuccess on successful process exit, ExitInterrupted if
/// the process was interrupted, ExitFailure if it otherwise failed.
ExitStatus Finish();
bool Done() const;
const string& GetOutput() const;
Subprocess(bool use_console);
bool Start(struct SubprocessSet* set, const string& command);
void OnPipeReady();
string buf_;
#ifdef _WIN32
/// Set up pipe_ as the parent-side pipe of the subprocess; return the
/// other end of the pipe, usable in the child process.
HANDLE SetupPipe(HANDLE ioport);
HANDLE child_;
HANDLE pipe_;
OVERLAPPED overlapped_;
char overlapped_buf_[4 << 10];
bool is_reading_;
int fd_;
pid_t pid_;
bool use_console_;
friend struct SubprocessSet;
/// SubprocessSet runs a ppoll/pselect() loop around a set of Subprocesses.
/// DoWork() waits for any state change in subprocesses; finished_
/// is a queue of subprocesses as they finish.
struct SubprocessSet {
Subprocess* Add(const string& command, bool use_console = false);
bool DoWork();
Subprocess* NextFinished();
void Clear();
vector<Subprocess*> running_;
queue<Subprocess*> finished_;
#ifdef _WIN32
static BOOL WINAPI NotifyInterrupted(DWORD dwCtrlType);
static HANDLE ioport_;
static void SetInterruptedFlag(int signum);
static void HandlePendingInterruption();
/// Store the signal number that causes the interruption.
/// 0 if not interruption.
static int interrupted_;
static bool IsInterrupted() { return interrupted_ != 0; }
struct sigaction old_int_act_;
struct sigaction old_term_act_;
struct sigaction old_hup_act_;
sigset_t old_mask_;