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// Copyright 2012 The Chromium Authors
// 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 <memory>
#include <string>
#include "base/command_line.h"
#include "base/memory/ref_counted.h"
#include "base/process/process.h"
#include "chromeos/process_proxy/process_output_watcher.h"
namespace base {
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::RepeatingCallback<void(ProcessOutputType output_type,
const std::string& output_data)>;
ProcessProxy();
ProcessProxy(const ProcessProxy&) = delete;
ProcessProxy& operator=(const ProcessProxy&) = delete;
// Opens a process using command |command| for the user with hash
// |user_id_hash|. Returns process ID on success, -1 on failure.
bool Open(const base::CommandLine& cmdline,
const std::string& user_id_hash,
std::string* id);
bool StartWatchingOutput(
const scoped_refptr<base::SingleThreadTaskRunner>& watcher_runner,
const scoped_refptr<base::SequencedTaskRunner>& callback_runner,
const OutputCallback& callback);
// Sends some data to the process.
void Write(const std::string& text, base::OnceCallback<void(bool)> callback);
// 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();
// Get the process handle for testing purposes.
const base::Process* GetProcessForTesting();
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.
bool LaunchProcess(const base::CommandLine& cmdline,
const std::string& user_id_hash,
int slave_fd,
std::string* id);
// 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);
void CallOnProcessOutputCallback(ProcessOutputType type,
const std::string& output);
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_;
scoped_refptr<base::TaskRunner> callback_runner_;
scoped_refptr<base::SingleThreadTaskRunner> watcher_runner_;
std::unique_ptr<ProcessOutputWatcher> output_watcher_;
base::Process process_;
int pt_pair_[2];
};
} // namespace chromeos
#endif // CHROMEOS_PROCESS_PROXY_PROCESS_PROXY_H_
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