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// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef CHROMEOS_PROCESS_PROXY_PROCESS_PROXY_H_
#define CHROMEOS_PROCESS_PROXY_PROCESS_PROXY_H_
#include <fcntl.h>
#include <signal.h>
#include <cstdio>
#include <string>
#include "base/macros.h"
#include "base/memory/ref_counted.h"
#include "chromeos/process_proxy/process_output_watcher.h"
namespace base {
class Process;
class SingleThreadTaskRunner;
class TaskRunner;
} // namespace base
namespace chromeos {
class ProcessOutputWatcher;
} // namespace chromeos
namespace chromeos {
// Proxy to a single ChromeOS process.
// This is refcounted. Note that output watcher, when it gets triggered owns a
// a callback with ref to this, so in order for this to be freed, the watcher
// must be destroyed. This is done in Close.
class ProcessProxy : public base::RefCountedThreadSafe<ProcessProxy> {
public:
using OutputCallback = base::Callback<void(ProcessOutputType output_type,
const std::string& output_data)>;
ProcessProxy();
// Opens a process using command |command|. Returns process ID on success, -1
// on failure.
int Open(const std::string& command);
bool StartWatchingOutput(
const scoped_refptr<base::SingleThreadTaskRunner>& watcher_runner,
const OutputCallback& callback);
// Sends some data to the process.
bool Write(const std::string& text);
// Closes the process.
void Close();
// Notifies underlaying process of terminal size change.
bool OnTerminalResize(int width, int height);
// Should be called when process output that was reported via |callback_| gets
// handled. It runs, and then resets |output_ack_callback_|.
void AckOutput();
private:
friend class base::RefCountedThreadSafe<ProcessProxy>;
// We want this be used as ref counted object only.
~ProcessProxy();
// Create master and slave end of pseudo terminal that will be used to
// communicate with process.
// pt_pair[0] -> master, pt_pair[1] -> slave.
// pt_pair must be allocated (to size at least 2).
bool CreatePseudoTerminalPair(int *pt_pair);
// Launches command in a new terminal process, mapping its stdout and stdin to
// |slave_fd|.
// Returns launched process id, or -1 on failure.
int LaunchProcess(const std::string& command, int slave_fd);
// Gets called by output watcher when the process writes something to its
// output streams. If set, |callback| should be called when the output is
// handled.
void OnProcessOutput(ProcessOutputType type,
const std::string& output,
const base::Closure& callback);
void CallOnProcessOutputCallback(ProcessOutputType type,
const std::string& output,
const base::Closure& callback);
void StopWatching();
// Expects array of 2 file descripters.
void CloseFdPair(int* pipe);
// Expects pointer to single file descriptor.
void CloseFd(int* fd);
// Expects array of 2 file descripters.
void ClearFdPair(int* pipe);
bool process_launched_;
bool callback_set_;
// Callback used to report process output detected by proces output watcher.
OutputCallback callback_;
// Callback received by process output watcher in |OnProcessOutput|.
// Process output watcher will be paused until this is run.
base::Closure output_ack_callback_;
scoped_refptr<base::TaskRunner> callback_runner_;
scoped_refptr<base::SingleThreadTaskRunner> watcher_runner_;
scoped_ptr<ProcessOutputWatcher> output_watcher_;
scoped_ptr<base::Process> process_;
int pt_pair_[2];
DISALLOW_COPY_AND_ASSIGN(ProcessProxy);
};
} // namespace chromeos
#endif // CHROMEOS_PROCESS_PROXY_PROCESS_PROXY_H_
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