mirror of
https://github.com/moby/moby.git
synced 2022-11-09 12:21:53 -05:00
118 lines
2.2 KiB
Go
118 lines
2.2 KiB
Go
// +build !windows
|
|
|
|
package term
|
|
|
|
import (
|
|
"errors"
|
|
"io"
|
|
"os"
|
|
"os/signal"
|
|
"syscall"
|
|
"unsafe"
|
|
)
|
|
|
|
var (
|
|
ErrInvalidState = errors.New("Invalid terminal state")
|
|
)
|
|
|
|
type State struct {
|
|
termios Termios
|
|
}
|
|
|
|
type Winsize struct {
|
|
Height uint16
|
|
Width uint16
|
|
x uint16
|
|
y uint16
|
|
}
|
|
|
|
func StdStreams() (stdIn io.ReadCloser, stdOut, stdErr io.Writer) {
|
|
return os.Stdin, os.Stdout, os.Stderr
|
|
}
|
|
|
|
func GetFdInfo(in interface{}) (uintptr, bool) {
|
|
var inFd uintptr
|
|
var isTerminalIn bool
|
|
if file, ok := in.(*os.File); ok {
|
|
inFd = file.Fd()
|
|
isTerminalIn = IsTerminal(inFd)
|
|
}
|
|
return inFd, isTerminalIn
|
|
}
|
|
|
|
func GetWinsize(fd uintptr) (*Winsize, error) {
|
|
ws := &Winsize{}
|
|
_, _, err := syscall.Syscall(syscall.SYS_IOCTL, fd, uintptr(syscall.TIOCGWINSZ), uintptr(unsafe.Pointer(ws)))
|
|
// Skipp errno = 0
|
|
if err == 0 {
|
|
return ws, nil
|
|
}
|
|
return ws, err
|
|
}
|
|
|
|
func SetWinsize(fd uintptr, ws *Winsize) error {
|
|
_, _, err := syscall.Syscall(syscall.SYS_IOCTL, fd, uintptr(syscall.TIOCSWINSZ), uintptr(unsafe.Pointer(ws)))
|
|
// Skipp errno = 0
|
|
if err == 0 {
|
|
return nil
|
|
}
|
|
return err
|
|
}
|
|
|
|
// IsTerminal returns true if the given file descriptor is a terminal.
|
|
func IsTerminal(fd uintptr) bool {
|
|
var termios Termios
|
|
return tcget(fd, &termios) == 0
|
|
}
|
|
|
|
// Restore restores the terminal connected to the given file descriptor to a
|
|
// previous state.
|
|
func RestoreTerminal(fd uintptr, state *State) error {
|
|
if state == nil {
|
|
return ErrInvalidState
|
|
}
|
|
if err := tcset(fd, &state.termios); err != 0 {
|
|
return err
|
|
}
|
|
return nil
|
|
}
|
|
|
|
func SaveState(fd uintptr) (*State, error) {
|
|
var oldState State
|
|
if err := tcget(fd, &oldState.termios); err != 0 {
|
|
return nil, err
|
|
}
|
|
|
|
return &oldState, nil
|
|
}
|
|
|
|
func DisableEcho(fd uintptr, state *State) error {
|
|
newState := state.termios
|
|
newState.Lflag &^= syscall.ECHO
|
|
|
|
if err := tcset(fd, &newState); err != 0 {
|
|
return err
|
|
}
|
|
handleInterrupt(fd, state)
|
|
return nil
|
|
}
|
|
|
|
func SetRawTerminal(fd uintptr) (*State, error) {
|
|
oldState, err := MakeRaw(fd)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
handleInterrupt(fd, oldState)
|
|
return oldState, err
|
|
}
|
|
|
|
func handleInterrupt(fd uintptr, state *State) {
|
|
sigchan := make(chan os.Signal, 1)
|
|
signal.Notify(sigchan, os.Interrupt)
|
|
|
|
go func() {
|
|
_ = <-sigchan
|
|
RestoreTerminal(fd, state)
|
|
os.Exit(0)
|
|
}()
|
|
}
|