Golang C.tcgetattr函数代码示例

func (t *tScreen) termioInit() error {
	var e error
	var rv C.int
	var newtios C.struct_termios
	var fd C.int

	if t.in, e = os.OpenFile("/dev/tty", os.O_RDONLY, 0); e != nil {
		goto failed
	}
	if t.out, e = os.OpenFile("/dev/tty", os.O_WRONLY, 0); e != nil {
		goto failed
	}

	t.tiosp = &termiosPrivate{}

	fd = C.int(t.out.Fd())
	if rv, e = C.tcgetattr(fd, &t.tiosp.tios); rv != 0 {
		goto failed
	}
	t.baud = int(C.getbaud(&t.tiosp.tios))
	newtios = t.tiosp.tios
	newtios.c_iflag &^= C.IGNBRK | C.BRKINT | C.PARMRK |
		C.ISTRIP | C.INLCR | C.IGNCR |
		C.ICRNL | C.IXON
	newtios.c_oflag &^= C.OPOST
	newtios.c_lflag &^= C.ECHO | C.ECHONL | C.ICANON |
		C.ISIG | C.IEXTEN
	newtios.c_cflag &^= C.CSIZE | C.PARENB
	newtios.c_cflag |= C.CS8

	// We wake up at the earliest of 100 msec or when data is received.
	// We need to wake up frequently to permit us to exit cleanly and
	// close file descriptors on systems like Darwin, where close does
	// cause a wakeup.  (Probably we could reasonably increase this to
	// something like 1 sec or 500 msec.)
	newtios.c_cc[C.VMIN] = 0
	newtios.c_cc[C.VTIME] = 1

	if rv, e = C.tcsetattr(fd, C.TCSANOW|C.TCSAFLUSH, &newtios); rv != 0 {
		goto failed
	}

	signal.Notify(t.sigwinch, syscall.SIGWINCH)

	if w, h, e := t.getWinSize(); e == nil && w != 0 && h != 0 {
		t.w = w
		t.h = h
	}

	return nil

failed:
	if t.in != nil {
		t.in.Close()
	}
	if t.out != nil {
		t.out.Close()
	}
	return e
}

/**
 * Open the serial port setting the baud etc.
 */
func openSerial() (io.ReadWriteCloser, error) {
	file, err :=
		os.OpenFile(
			"/dev/ttyUSB0",
			syscall.O_RDWR|syscall.O_NOCTTY,
			0600)
	if err != nil {
		return nil, err
	}

	fd := C.int(file.Fd())
	if C.isatty(fd) == 0 {
		err := errors.New("File is not a serial port")
		return nil, err
	}

	var termios C.struct_termios
	_, err = C.tcgetattr(fd, &termios)
	if err != nil {
		return nil, err
	}

	var baud C.speed_t
	baud = C.B115200
	_, err = C.cfsetispeed(&termios, baud)
	if err != nil {
		return nil, err
	}
	_, err = C.cfsetospeed(&termios, baud)
	if err != nil {
		return nil, err
	}
	return file, nil
}

func (c *Connection) setBaudRate(baud Baud) error {
	fd, err := c.getFileDescriptor()
	if err != nil {
		return err
	}

	var st C.struct_termios
	_, err = C.tcgetattr(fd, &st)
	if err != nil {
		return err
	}

	speed, err := convertBaud(c.Baud)
	if err != nil {
		return err
	}

	_, err = C.cfsetispeed(&st, speed)
	if err != nil {
		return err
	}

	_, err = C.cfsetospeed(&st, speed)
	if err != nil {
		return err
	}

	return nil
}

func tcget(fd uintptr, p *Termios) syscall.Errno {
	ret, err := C.tcgetattr(C.int(fd), (*C.struct_termios)(unsafe.Pointer(p)))
	if ret != 0 {
		return err.(syscall.Errno)
	}
	return 0
}

// Thin wrapper around tcgetattr.
func getTermSettings() (settings C.struct_termios) {
	res, err := C.tcgetattr(C.int(os.Stderr.Fd()), &settings)
	if res != 0 {
		panic(fmt.Sprintf("tcgetattr returned %d: %v", res, err))
	}

	return
}

// Gets terminal state.
//
// int tcgetattr(int fd, struct termios *termios_p);
func (tc *termios) tcgetattr() error {
	exitCode, errno := C.tcgetattr(C.int(tc.fd), tc.wrap)

	if exitCode == 0 {
		return nil
	}
	return errno
}

// Gets a terminal's attributes.  Akin to tcgetattr().
func (t *Terminal) GetAttributes() (*Attributes, os.Error) {
	var cattr C.struct_termios
	result := int(C.tcgetattr(C.int(t.Fd()), &cattr))
	if result < 0 {
		return nil, os.NewError("Unable to get terminal attributes.")
	}
	return makeGoAttributes(&cattr), nil
}

// Wrapper of tcgetattr(3).
// The GetAttr() function copies the parameters associated with the terminal.
func (t *Termios) GetAttr(fd int) error {
	var cTerm C.struct_termios

	if C.tcgetattr(C.int(fd), &cTerm) == -1 {
		return errors.New("tcgetattr failure")
	}
	*t = *goTermios(&cTerm)
	return nil
}

func (bp *baseport) getattr() (*C.struct_termios, error) {
	var tio C.struct_termios
	res, err := C.tcgetattr(C.int(bp.f.Fd()), (*C.struct_termios)(unsafe.Pointer(&tio)))
	if res != 0 || err != nil {
		return nil, err
	}

	return &tio, nil
}

func (c *Connection) open() (err error) {
	c.file, err = os.OpenFile(c.Name, syscall.O_RDWR|syscall.O_NOCTTY|syscall.O_NONBLOCK, 0666)
	if err != nil {
		return err
	}

	fd, err := c.getFileDescriptor()
	if err != nil {
		c.file.Close()
		return err
	}

	var st C.struct_termios
	_, err = C.tcgetattr(fd, &st)
	if err != nil {
		c.file.Close()
		return err
	}

	// set the baud rate of the connection
	err = c.setBaudRate(c.Baud)
	if err != nil {
		c.file.Close()
		return err
	}

	// No timeout set directly on termios
	st.c_cc[C.VMIN] = 0
	st.c_cc[C.VTIME] = 0

	// Select local mode
	st.c_cflag |= (C.CLOCAL | C.CREAD)

	// Select raw mode
	st.c_lflag &= ^C.tcflag_t(C.ICANON | C.ECHO | C.ECHOE | C.ISIG)
	st.c_oflag &= ^C.tcflag_t(C.OPOST)

	_, err = C.tcsetattr(fd, C.TCSANOW, &st)
	if err != nil {
		c.file.Close()
		return err
	}

	r1, _, e := syscall.Syscall(syscall.SYS_FCNTL,
		uintptr(c.file.Fd()),
		uintptr(syscall.F_SETFL),
		uintptr(0))
	if e != 0 || r1 != 0 {
		s := fmt.Sprint("Clearing NONBLOCK syscall error:", e, r1)
		c.file.Close()
		return errors.New(s)
	}

	return nil
}

// Getattr copies the parameters associated with the terminal
// referenced by fd in the Termios structure referenced by dst.
func Getattr(fd uintptr, dst *Termios) error {
	_, rv := C.tcgetattr(C.int(fd), &dst.i)
	if rv == nil {
		dst.C_iflag = dst.i.c_iflag
		dst.C_oflag = dst.i.c_oflag
		dst.C_cflag = dst.i.c_cflag
		dst.C_lflag = dst.i.c_lflag
		dst.C_cc = dst.i.c_cc
	}
	return rv
}

func GetState(fd int) (*State, error) {
	termios := syscall.Termios{}

	ret, err := C.tcgetattr(C.int(fd), (*C.struct_termios)(unsafe.Pointer(&termios)))
	if ret != 0 {
		return nil, err.(syscall.Errno)
	}

	state := State{}
	state.Termios = termios

	return &state, nil
}

// GetFd reads the attributes of the terminal corresponding to the
// file-descriptor fd and stores them in the Termios structure t. See
// tcgetattr(3) for more.
func (t *Termios) GetFd(fd int) error {
	for {
		r, err := C.tcgetattr(C.int(fd), &t.t)
		if r < 0 {
			// This is most-likely not possible, but
			// better be safe.
			if err == syscall.EINTR {
				continue
			}
			return err
		}
		return nil
	}
}

func ReadPassphrase() string {
	stdin := C.int(os.Stdin.Fd())
	C.tcgetattr(stdin, &C.AttrOld)
	C.Attr = C.AttrOld
	C.Attr.c_lflag = C.Attr.c_lflag&^C.ECHO | C.ECHONL
	C.tcsetattr(stdin, C.TCSANOW, &C.Attr)
	defer C.tcsetattr(stdin, C.TCSANOW, &C.AttrOld)
	reader := bufio.NewReader(os.Stdin)
	line, err := reader.ReadString('\n')
	if err != nil {
		return ""
	}
	return strings.TrimSpace(line)
}

// SetInputAttr sets VMIN and VTIME for control serial reads.
//
// In non-canonical input processing mode, input is not assembled into
// lines and input processing (erase, kill, delete, etc.) does not
// occur. Two parameters control the behavior of this mode:
// c_cc[VTIME] sets the character timer, and c_cc[VMIN] sets the
// minimum number of characters to receive before satisfying the read.
//
// If MIN > 0 and TIME = 0, MIN sets the number of characters to
//receive before the read is satisfied. As TIME is zero, the timer is
//not used.
//
// If MIN = 0 and TIME > 0, TIME serves as a timeout value. The read
//will be satisfied if a single character is read, or TIME is exceeded
//(t = TIME *0.1 s). If TIME is exceeded, no character will be
//returned.
//
// If MIN > 0 and TIME > 0, TIME serves as an inter-character
//timer. The read will be satisfied if MIN characters are received, or
//the time between two characters exceeds TIME. The timer is restarted
//every time a character is received and only becomes active after the
//first character has been received.
//
// If MIN = 0 and TIME = 0, read will be satisfied immediately. The
//number of characters currently available, or the number of
//characters requested will be returned. According to Antonino (see
//contributions), you could issue a fcntl(fd, F_SETFL, FNDELAY);
//before reading to get the same result.
//
// By modifying newtio.c_cc[VTIME] and newtio.c_cc[VMIN] all modes
//described above can be tested.
//
// -- copied from http://tldp.org/HOWTO/Serial-Programming-HOWTO/x115.html
func (port *SerialPort) SetInputAttr(minBytes int, timeout time.Duration) error {
	fd := port.port.Fd()

	var options C.struct_termios
	if C.tcgetattr(C.int(fd), &options) < 0 {
		return fmt.Errorf("tcgetattr failed")
	}
	options.c_cc[C.VMIN] = _Ctype_cc_t(minBytes)
	options.c_cc[C.VTIME] = _Ctype_cc_t(timeout / (time.Second / 10))

	if C.tcsetattr(C.int(fd), C.TCSANOW, &options) < 0 {
		return fmt.Errorf("tcsetattr failed")
	}
	return nil
}