| // +build !windows |
| // +build !plan9 |
| |
| package tty |
| |
| import ( |
| "bufio" |
| "os" |
| "os/signal" |
| "syscall" |
| "unsafe" |
| |
| "golang.org/x/sys/unix" |
| ) |
| |
| type TTY struct { |
| in *os.File |
| bin *bufio.Reader |
| out *os.File |
| termios syscall.Termios |
| ss chan os.Signal |
| } |
| |
| func open(path string) (*TTY, error) { |
| tty := new(TTY) |
| |
| in, err := os.Open(path) |
| if err != nil { |
| return nil, err |
| } |
| tty.in = in |
| tty.bin = bufio.NewReader(in) |
| |
| out, err := os.OpenFile(path, syscall.O_WRONLY, 0) |
| if err != nil { |
| return nil, err |
| } |
| tty.out = out |
| |
| if _, _, err := syscall.Syscall(syscall.SYS_IOCTL, uintptr(tty.in.Fd()), ioctlReadTermios, uintptr(unsafe.Pointer(&tty.termios))); err != 0 { |
| return nil, err |
| } |
| newios := tty.termios |
| newios.Iflag &^= syscall.ISTRIP | syscall.INLCR | syscall.ICRNL | syscall.IGNCR | syscall.IXOFF |
| newios.Lflag &^= syscall.ECHO | syscall.ICANON /*| syscall.ISIG*/ |
| if _, _, err := syscall.Syscall(syscall.SYS_IOCTL, uintptr(tty.in.Fd()), ioctlWriteTermios, uintptr(unsafe.Pointer(&newios))); err != 0 { |
| return nil, err |
| } |
| |
| tty.ss = make(chan os.Signal, 1) |
| |
| return tty, nil |
| } |
| |
| func (tty *TTY) buffered() bool { |
| return tty.bin.Buffered() > 0 |
| } |
| |
| func (tty *TTY) readRune() (rune, error) { |
| r, _, err := tty.bin.ReadRune() |
| return r, err |
| } |
| |
| func (tty *TTY) close() error { |
| signal.Stop(tty.ss) |
| close(tty.ss) |
| _, _, err := syscall.Syscall(syscall.SYS_IOCTL, uintptr(tty.in.Fd()), ioctlWriteTermios, uintptr(unsafe.Pointer(&tty.termios))) |
| return err |
| } |
| |
| func (tty *TTY) size() (int, int, error) { |
| x, y, _, _, err := tty.sizePixel() |
| return x, y, err |
| } |
| |
| func (tty *TTY) sizePixel() (int, int, int, int, error) { |
| var dim [4]uint16 |
| if _, _, err := syscall.Syscall(syscall.SYS_IOCTL, uintptr(tty.out.Fd()), uintptr(syscall.TIOCGWINSZ), uintptr(unsafe.Pointer(&dim))); err != 0 { |
| return -1, -1, -1, -1, err |
| } |
| return int(dim[1]), int(dim[0]), int(dim[2]), int(dim[3]), nil |
| } |
| |
| func (tty *TTY) input() *os.File { |
| return tty.in |
| } |
| |
| func (tty *TTY) output() *os.File { |
| return tty.out |
| } |
| |
| func (tty *TTY) raw() (func() error, error) { |
| termios, err := unix.IoctlGetTermios(int(tty.in.Fd()), ioctlReadTermios) |
| if err != nil { |
| return nil, err |
| } |
| backup := *termios |
| |
| termios.Iflag &^= unix.IGNBRK | unix.BRKINT | unix.PARMRK | unix.ISTRIP | unix.INLCR | unix.IGNCR | unix.ICRNL | unix.IXON |
| termios.Oflag &^= unix.OPOST |
| termios.Lflag &^= unix.ECHO | unix.ECHONL | unix.ICANON | unix.ISIG | unix.IEXTEN |
| termios.Cflag &^= unix.CSIZE | unix.PARENB |
| termios.Cflag |= unix.CS8 |
| termios.Cc[unix.VMIN] = 1 |
| termios.Cc[unix.VTIME] = 0 |
| if err := unix.IoctlSetTermios(int(tty.in.Fd()), ioctlWriteTermios, termios); err != nil { |
| return nil, err |
| } |
| |
| return func() error { |
| if err := unix.IoctlSetTermios(int(tty.in.Fd()), ioctlWriteTermios, &backup); err != nil { |
| return err |
| } |
| return nil |
| }, nil |
| } |
| |
| func (tty *TTY) sigwinch() <-chan WINSIZE { |
| signal.Notify(tty.ss, syscall.SIGWINCH) |
| |
| ws := make(chan WINSIZE) |
| go func() { |
| defer close(ws) |
| for sig := range tty.ss { |
| if sig != syscall.SIGWINCH { |
| continue |
| } |
| |
| w, h, err := tty.size() |
| if err != nil { |
| continue |
| } |
| // send but do not block for it |
| select { |
| case ws <- WINSIZE{W: w, H: h}: |
| default: |
| } |
| |
| } |
| }() |
| return ws |
| } |