mirror of https://github.com/docker/docs.git
104 lines
2.2 KiB
Go
104 lines
2.2 KiB
Go
package term
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import (
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"errors"
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"os"
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"os/signal"
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"syscall"
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"unsafe"
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)
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var (
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ErrInvalidState = errors.New("Invalid terminal state")
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)
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type State struct {
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termios Termios
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}
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type Winsize struct {
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Height uint16
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Width uint16
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x uint16
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y uint16
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}
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func GetWinsize(fd uintptr) (*Winsize, error) {
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ws := &Winsize{}
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_, _, err := syscall.Syscall(syscall.SYS_IOCTL, fd, uintptr(syscall.TIOCGWINSZ), uintptr(unsafe.Pointer(ws)))
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// Skipp errno = 0
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if err == 0 {
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return ws, nil
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}
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return ws, err
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}
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func SetWinsize(fd uintptr, ws *Winsize) error {
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_, _, err := syscall.Syscall(syscall.SYS_IOCTL, fd, uintptr(syscall.TIOCSWINSZ), uintptr(unsafe.Pointer(ws)))
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// Skipp errno = 0
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if err == 0 {
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return nil
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}
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return err
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}
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// IsTerminal returns true if the given file descriptor is a terminal.
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func IsTerminal(fd uintptr) bool {
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var termios Termios
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_, _, err := syscall.Syscall(syscall.SYS_IOCTL, fd, uintptr(getTermios), uintptr(unsafe.Pointer(&termios)))
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return err == 0
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}
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// Restore restores the terminal connected to the given file descriptor to a
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// previous state.
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func RestoreTerminal(fd uintptr, state *State) error {
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if state == nil {
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return ErrInvalidState
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}
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_, _, err := syscall.Syscall(syscall.SYS_IOCTL, fd, uintptr(setTermios), uintptr(unsafe.Pointer(&state.termios)))
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if err != 0 {
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return err
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}
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return nil
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}
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func SaveState(fd uintptr) (*State, error) {
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var oldState State
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if _, _, err := syscall.Syscall(syscall.SYS_IOCTL, fd, getTermios, uintptr(unsafe.Pointer(&oldState.termios))); err != 0 {
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return nil, err
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}
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return &oldState, nil
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}
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func DisableEcho(fd uintptr, state *State) error {
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newState := state.termios
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newState.Lflag &^= syscall.ECHO
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if _, _, err := syscall.Syscall(syscall.SYS_IOCTL, fd, setTermios, uintptr(unsafe.Pointer(&newState))); err != 0 {
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return err
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}
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handleInterrupt(fd, state)
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return nil
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}
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func SetRawTerminal(fd uintptr) (*State, error) {
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oldState, err := MakeRaw(fd)
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if err != nil {
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return nil, err
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}
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handleInterrupt(fd, oldState)
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return oldState, err
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}
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func handleInterrupt(fd uintptr, state *State) {
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sigchan := make(chan os.Signal, 1)
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signal.Notify(sigchan, os.Interrupt)
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go func() {
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_ = <-sigchan
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RestoreTerminal(fd, state)
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os.Exit(0)
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}()
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}
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