blob: 598fd5fa1e3c72a0f96b2cbe4cdbbc2b32c66041 [file] [log] [blame]
// 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.
#include <string>
#include "base/callback.h"
#include "chromeos/chromeos_export.h"
namespace chromeos {
enum ProcessOutputType {
typedef base::Callback<void(ProcessOutputType, const std::string&)>
// Observes output on |out_fd| and invokes |callback| when some output is
// detected. It assumes UTF8 output.
// If output is detected in |stop_fd|, the watcher is stopped.
// This class should live on its own thread because running class makes
// underlying thread block. It deletes itself when watching is stopped.
class CHROMEOS_EXPORT ProcessOutputWatcher {
ProcessOutputWatcher(int out_fd, int stop_fd,
const ProcessOutputCallback& callback);
// This will block current thread!!!!
void Start();
// The object will destroy itself when it stops watching process output.
// Listens to output from supplied fds. It guarantees data written to one fd
// will be reported in order that it has been written (this is not true across
// fds, it would be nicer if it was).
void WatchProcessOutput();
// Verifies that fds that we got are properly set.
void VerifyFileDescriptor(int fd);
// Reads data from fd, and when it's done, invokes callback function.
void ReadFromFd(ProcessOutputType type, int* fd);
// Checks if the read buffer has any trailing incomplete UTF8 characters and
// returns the read buffer size without them.
size_t OutputSizeWithoutIncompleteUTF8();
// Processes new |read_buffer_| state and notifies observer about new process
// output.
void ReportOutput(ProcessOutputType type, size_t new_bytes_count);
// It will just delete this.
void OnStop();
char read_buffer_[256];
// Maximum read buffer content size.
size_t read_buffer_capacity_;
// Current read bufferi content size.
size_t read_buffer_size_;
int out_fd_;
int stop_fd_;
int max_fd_;
// Callback that will be invoked when some output is detected.
ProcessOutputCallback on_read_callback_;
} // namespace chromeos