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tty_unix.go
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tty_unix.go
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// +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
}