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111 lines
2.2 KiB
111 lines
2.2 KiB
9 years ago
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// +build linux darwin freebsd netbsd openbsd solaris dragonfly
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// +build !appengine
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package pb
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import (
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"errors"
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"fmt"
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"os"
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"os/signal"
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"runtime"
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"sync"
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"syscall"
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"unsafe"
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)
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const (
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TIOCGWINSZ = 0x5413
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TIOCGWINSZ_OSX = 1074295912
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)
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var tty *os.File
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var ErrPoolWasStarted = errors.New("Bar pool was started")
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var echoLocked bool
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var echoLockMutex sync.Mutex
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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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tio := syscall.TIOCGWINSZ
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if runtime.GOOS == "darwin" {
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tio = TIOCGWINSZ_OSX
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}
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res, _, err := syscall.Syscall(sysIoctl,
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tty.Fd(),
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uintptr(tio),
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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() (quit chan int, err error) {
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echoLockMutex.Lock()
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defer echoLockMutex.Unlock()
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if echoLocked {
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err = ErrPoolWasStarted
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return
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}
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echoLocked = true
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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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quit = make(chan int, 1)
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go catchTerminate(quit)
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return
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}
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func unlockEcho() (err error) {
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echoLockMutex.Lock()
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defer echoLockMutex.Unlock()
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if !echoLocked {
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return
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}
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echoLocked = false
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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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// listen exit signals and restore terminal state
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func catchTerminate(quit chan int) {
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sig := make(chan os.Signal, 1)
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signal.Notify(sig, os.Interrupt, syscall.SIGQUIT, syscall.SIGTERM, syscall.SIGKILL)
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defer signal.Stop(sig)
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select {
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case <-quit:
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unlockEcho()
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case <-sig:
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unlockEcho()
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}
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}
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