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// Copyright 2011 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
//
// 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.
#ifndef NINJA_SUBPROCESS_H_
#define NINJA_SUBPROCESS_H_
#include <string>
#include <vector>
#include <queue>
using namespace std;
#ifdef _WIN32
#include <windows.h>
#endif
/// 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 {
Subprocess();
~Subprocess();
bool Start(struct SubprocessSet* set, const string& command);
void OnPipeReady();
/// Returns true on successful process exit.
bool Finish();
bool Done() const;
const string& GetOutput() const;
private:
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];
#else
int fd_;
pid_t pid_;
#endif
friend struct SubprocessSet;
};
/// SubprocessSet runs a poll() 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 {
SubprocessSet();
~SubprocessSet();
void Add(Subprocess* subprocess);
void DoWork();
Subprocess* NextFinished();
vector<Subprocess*> running_;
queue<Subprocess*> finished_;
#ifdef _WIN32
HANDLE ioport_;
#endif
};
#endif // NINJA_SUBPROCESS_H_
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