Golang syscall.Termios類代碼示例

func setTermSettingsCtsRts(enable bool, settings *syscall.Termios) {
	if enable {
		settings.Cflag |= termiosMask(tcCRTSCTS)
	} else {
		settings.Cflag &= ^termiosMask(tcCRTSCTS)
	}
}

// Configure configures f as a 8N1 serial port with the specified baudrate.
func Configure(f fder, baudrate uint32) error {
	var termios syscall.Termios
	if _, _, err := syscall.Syscall(syscall.SYS_IOCTL, uintptr(f.Fd()), uintptr(syscall.TCGETS), uintptr(unsafe.Pointer(&termios))); err != 0 {
		return err
	}

	termios.Ispeed = baudrate
	termios.Ospeed = baudrate
	termios.Cflag &^= CBAUD
	termios.Cflag &^= CBAUDEX
	termios.Cflag |= baudrate

	// set 8N1
	termios.Cflag &^= syscall.PARENB
	termios.Cflag &^= syscall.CSTOPB
	termios.Cflag &^= syscall.CSIZE
	termios.Cflag |= syscall.CS8

	// Local connection, no modem control
	termios.Cflag |= (syscall.CLOCAL | syscall.CREAD)
	// Disable hardware flow control
	termios.Cflag &^= CRTSCTS
	// Block on a zero read (instead of returning EOF)
	termios.Cc[syscall.VMIN] = 1

	if _, _, err := syscall.Syscall(syscall.SYS_IOCTL, uintptr(f.Fd()), syscall.TCSETS, uintptr(unsafe.Pointer(&termios))); err != 0 {
		return err
	}
	return nil
}

func (l *lflagSetter) Set(pty *os.File, termios *syscall.Termios, value uint32) error {
	if value == 0 {
		termios.Lflag &^= l.Flag
	} else {
		termios.Lflag |= l.Flag
	}
	return SetAttr(pty, termios)
}

func (i *iflagSetter) Set(pty *os.File, termios *syscall.Termios, value uint32) error {
	if value == 0 {
		termios.Iflag &^= i.Flag
	} else {
		termios.Iflag |= i.Flag
	}
	return TcSetAttr(pty, termios)
}

func setTermSettingsDataBits(bits int, settings *syscall.Termios) error {
	databits, ok := databitsMap[bits]
	if !ok {
		return &SerialPortError{code: ERROR_INVALID_PORT_DATA_BITS}
	}
	settings.Cflag &= ^termiosMask(syscall.CSIZE)
	settings.Cflag |= termiosMask(databits)
	return nil
}

// Cfmakeraw modifies attr for raw mode.
func Cfmakeraw(attr *syscall.Termios) {
	attr.Iflag &^= syscall.BRKINT | syscall.ICRNL | syscall.INPCK | syscall.ISTRIP | syscall.IXON
	attr.Oflag &^= syscall.OPOST
	attr.Cflag &^= syscall.CSIZE | syscall.PARENB
	attr.Cflag |= syscall.CS8
	attr.Lflag &^= syscall.ECHO | syscall.ICANON | syscall.IEXTEN | syscall.ISIG
	attr.Cc[syscall.VMIN] = 1
	attr.Cc[syscall.VTIME] = 0
}

func setTermSettingsDataBits(bits int, settings *syscall.Termios) error {
	databits, ok := databitsMap[bits]
	if !ok {
		return &PortError{code: InvalidDataBits}
	}
	settings.Cflag &= ^termiosMask(syscall.CSIZE)
	settings.Cflag |= termiosMask(databits)
	return nil
}

// returns non-canonical mode term for keybind
func rawModeTerm(term syscall.Termios) syscall.Termios {
	term.Iflag &= syscall.IGNCR  // ignore received CR
	term.Lflag ^= syscall.ICANON // disable canonical mode
	term.Lflag ^= syscall.ECHO   // disable echo of input
	term.Lflag ^= syscall.ISIG   // disable signal
	term.Cc[syscall.VMIN] = 1    // number of bytes to read()
	term.Cc[syscall.VTIME] = 0   // timeout of read()
	return term
}

func setTermSettingsStopBits(bits StopBits, settings *syscall.Termios) error {
	switch bits {
	case OneStopBit:
		settings.Cflag &= ^termiosMask(syscall.CSTOPB)
	case OnePointFiveStopBits, TwoStopBits:
		settings.Cflag |= termiosMask(syscall.CSTOPB)
	}
	return nil
}

func setTermSettingsStopBits(bits StopBits, settings *syscall.Termios) error {
	switch bits {
	case STOPBITS_ONE:
		settings.Cflag &= ^termiosMask(syscall.CSTOPB)
	case STOPBITS_ONEPOINTFIVE, STOPBITS_TWO:
		settings.Cflag |= termiosMask(syscall.CSTOPB)
	}
	return nil
}

// disableEcho disables terminal echoing, which simplifies parsing by
// not having our inputs mixed into it.
func (b *Bash) disableEcho() error {
	var termios syscall.Termios
	_, _, errno := syscall.Syscall(syscall.SYS_IOCTL,
		b.pty.Fd(), uintptr(syscall.TCGETS), uintptr(unsafe.Pointer(&termios)))
	if errno != 0 {
		return errno
	}
	termios.Lflag &^= syscall.ECHO
	_, _, errno = syscall.Syscall(syscall.SYS_IOCTL,
		b.pty.Fd(), uintptr(syscall.TCSETS), uintptr(unsafe.Pointer(&termios)))
	if errno != 0 {
		return errno
	}
	return nil
}

func setRawMode(settings *syscall.Termios) {
	// Set local mode
	settings.Cflag |= termiosMask(syscall.CREAD | syscall.CLOCAL)

	// Set raw mode
	settings.Lflag &= ^termiosMask(syscall.ICANON | syscall.ECHO | syscall.ECHOE | syscall.ECHOK |
		syscall.ECHONL | syscall.ECHOCTL | syscall.ECHOPRT | syscall.ECHOKE | syscall.ISIG | syscall.IEXTEN)
	settings.Iflag &= ^termiosMask(syscall.IXON | syscall.IXOFF | syscall.IXANY | syscall.INPCK |
		syscall.IGNPAR | syscall.PARMRK | syscall.ISTRIP | syscall.IGNBRK | syscall.BRKINT | syscall.INLCR |
		syscall.IGNCR | syscall.ICRNL | tcIUCLC)
	settings.Oflag &= ^termiosMask(syscall.OPOST)

	// Block reads until at least one char is available (no timeout)
	settings.Cc[syscall.VMIN] = 1
	settings.Cc[syscall.VTIME] = 0
}

func setTermSettingsBaudrate(speed int, settings *syscall.Termios) error {
	baudrate, ok := baudrateMap[speed]
	if !ok {
		return &PortError{code: InvalidSpeed}
	}
	// revert old baudrate
	var BAUDMASK uint
	for _, rate := range baudrateMap {
		BAUDMASK |= rate
	}
	settings.Cflag &= ^termiosMask(BAUDMASK)
	// set new baudrate
	settings.Cflag |= termiosMask(baudrate)
	settings.Ispeed = termiosMask(baudrate)
	settings.Ospeed = termiosMask(baudrate)
	return nil
}

// saneTerminal sets the necessary tty_ioctl(4)s to ensure that a pty pair
// created by us acts normally. In particular, a not-very-well-known default of
// Linux unix98 ptys is that they have +onlcr by default. While this isn't a
// problem for terminal emulators, because we relay data from the terminal we
// also relay that funky line discipline.
func saneTerminal(terminal *os.File) error {
	// Go doesn't have a wrapper for any of the termios ioctls.
	var termios syscall.Termios

	if err := ioctl(terminal.Fd(), syscall.TCGETS, uintptr(unsafe.Pointer(&termios))); err != nil {
		return fmt.Errorf("ioctl(tty, tcgets): %s", err.Error())
	}

	// Set -onlcr so we don't have to deal with \r.
	termios.Oflag &^= syscall.ONLCR

	if err := ioctl(terminal.Fd(), syscall.TCSETS, uintptr(unsafe.Pointer(&termios))); err != nil {
		return fmt.Errorf("ioctl(tty, tcsets): %s", err.Error())
	}

	return nil
}

func setTermSettingsBaudrate(speed int, settings *syscall.Termios) error {
	baudrate, ok := baudrateMap[speed]
	if !ok {
		return &SerialPortError{code: ERROR_INVALID_PORT_SPEED}
	}
	// revert old baudrate
	BAUDMASK := 0
	for _, rate := range baudrateMap {
		BAUDMASK |= rate
	}
	settings.Cflag &= ^termiosMask(BAUDMASK)
	// set new baudrate
	settings.Cflag |= termiosMask(baudrate)
	settings.Ispeed = termiosMask(baudrate)
	settings.Ospeed = termiosMask(baudrate)
	return nil
}