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// Copyright 2014 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 DEVICE_SERIAL_SERIAL_IO_HANDLER_POSIX_H_
#define DEVICE_SERIAL_SERIAL_IO_HANDLER_POSIX_H_
#include "base/macros.h"
#include "base/message_loop/message_loop.h"
#include "base/single_thread_task_runner.h"
#include "base/thread_task_runner_handle.h"
#include "device/serial/serial_io_handler.h"
namespace device {
// Linux reports breaks and parity errors by inserting the sequence '\377\0x'
// into the byte stream where 'x' is '\0' for a break and the corrupted byte for
// a parity error.
enum class ErrorDetectState { NO_ERROR, MARK_377_SEEN, MARK_0_SEEN };
class SerialIoHandlerPosix : public SerialIoHandler,
public base::MessageLoopForIO::Watcher {
protected:
// SerialIoHandler impl.
void ReadImpl() override;
void WriteImpl() override;
void CancelReadImpl() override;
void CancelWriteImpl() override;
bool ConfigurePortImpl() override;
bool Flush() const override;
serial::DeviceControlSignalsPtr GetControlSignals() const override;
bool SetControlSignals(
const serial::HostControlSignals& control_signals) override;
serial::ConnectionInfoPtr GetPortInfo() const override;
bool SetBreak() override;
bool ClearBreak() override;
int CheckReceiveError(char* buffer,
int buffer_len,
int bytes_read,
bool& break_detected,
bool& parity_error_detected);
private:
friend class SerialIoHandler;
friend class SerialIoHandlerPosixTest;
SerialIoHandlerPosix(
scoped_refptr<base::SingleThreadTaskRunner> file_thread_task_runner,
scoped_refptr<base::SingleThreadTaskRunner> ui_thread_task_runner);
~SerialIoHandlerPosix() override;
// base::MessageLoopForIO::Watcher implementation.
void OnFileCanWriteWithoutBlocking(int fd) override;
void OnFileCanReadWithoutBlocking(int fd) override;
void EnsureWatchingReads();
void EnsureWatchingWrites();
base::MessageLoopForIO::FileDescriptorWatcher file_read_watcher_;
base::MessageLoopForIO::FileDescriptorWatcher file_write_watcher_;
// Flags indicating if the message loop is watching the device for IO events.
bool is_watching_reads_;
bool is_watching_writes_;
ErrorDetectState error_detect_state_;
bool parity_check_enabled_;
char chars_stashed_[2];
int num_chars_stashed_;
DISALLOW_COPY_AND_ASSIGN(SerialIoHandlerPosix);
};
} // namespace device
#endif // DEVICE_SERIAL_SERIAL_IO_HANDLER_POSIX_H_
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