77 lines
1.5 KiB
Go
77 lines
1.5 KiB
Go
// +build linux darwin freebsd netbsd openbsd solaris dragonfly
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// +build !appengine
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package termutil
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import (
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"fmt"
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"os"
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"syscall"
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"unsafe"
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)
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var (
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tty *os.File
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unlockSignals = []os.Signal{
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os.Interrupt, syscall.SIGQUIT, syscall.SIGTERM, syscall.SIGKILL,
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}
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)
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type window struct {
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Row uint16
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Col uint16
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Xpixel uint16
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Ypixel uint16
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}
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func init() {
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var err error
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tty, err = os.Open("/dev/tty")
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if err != nil {
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tty = os.Stdin
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}
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}
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// TerminalWidth returns width of the terminal.
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func TerminalWidth() (int, error) {
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w := new(window)
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res, _, err := syscall.Syscall(sysIoctl,
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tty.Fd(),
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uintptr(syscall.TIOCGWINSZ),
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uintptr(unsafe.Pointer(w)),
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)
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if int(res) == -1 {
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return 0, err
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}
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return int(w.Col), nil
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}
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var oldState syscall.Termios
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func lockEcho() (err error) {
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fd := tty.Fd()
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if _, _, e := syscall.Syscall6(sysIoctl, fd, ioctlReadTermios, uintptr(unsafe.Pointer(&oldState)), 0, 0, 0); e != 0 {
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err = fmt.Errorf("Can't get terminal settings: %v", e)
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return
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}
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newState := oldState
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newState.Lflag &^= syscall.ECHO
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newState.Lflag |= syscall.ICANON | syscall.ISIG
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newState.Iflag |= syscall.ICRNL
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if _, _, e := syscall.Syscall6(sysIoctl, fd, ioctlWriteTermios, uintptr(unsafe.Pointer(&newState)), 0, 0, 0); e != 0 {
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err = fmt.Errorf("Can't set terminal settings: %v", e)
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return
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}
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return
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}
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func unlockEcho() (err error) {
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fd := tty.Fd()
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if _, _, e := syscall.Syscall6(sysIoctl, fd, ioctlWriteTermios, uintptr(unsafe.Pointer(&oldState)), 0, 0, 0); e != 0 {
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err = fmt.Errorf("Can't set terminal settings")
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}
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return
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}
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