109 lines
2.1 KiB
Go
109 lines
2.1 KiB
Go
// +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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"sync"
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"syscall"
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"golang.org/x/sys/unix"
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)
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var ErrPoolWasStarted = errors.New("Bar pool was started")
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var (
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echoLockMutex sync.Mutex
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origTermStatePtr *unix.Termios
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tty *os.File
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)
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func init() {
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echoLockMutex.Lock()
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defer echoLockMutex.Unlock()
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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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echoLockMutex.Lock()
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defer echoLockMutex.Unlock()
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fd := int(tty.Fd())
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ws, err := unix.IoctlGetWinsize(fd, unix.TIOCGWINSZ)
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if err != nil {
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return 0, err
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}
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return int(ws.Col), nil
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}
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func lockEcho() (shutdownCh chan struct{}, err error) {
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echoLockMutex.Lock()
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defer echoLockMutex.Unlock()
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if origTermStatePtr != nil {
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return shutdownCh, ErrPoolWasStarted
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}
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fd := int(tty.Fd())
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origTermStatePtr, err = unix.IoctlGetTermios(fd, ioctlReadTermios)
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if err != nil {
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return nil, fmt.Errorf("Can't get terminal settings: %v", err)
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}
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oldTermios := *origTermStatePtr
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newTermios := oldTermios
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newTermios.Lflag &^= syscall.ECHO
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newTermios.Lflag |= syscall.ICANON | syscall.ISIG
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newTermios.Iflag |= syscall.ICRNL
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if err := unix.IoctlSetTermios(fd, ioctlWriteTermios, &newTermios); err != nil {
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return nil, fmt.Errorf("Can't set terminal settings: %v", err)
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}
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shutdownCh = make(chan struct{})
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go catchTerminate(shutdownCh)
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return
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}
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func unlockEcho() error {
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echoLockMutex.Lock()
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defer echoLockMutex.Unlock()
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if origTermStatePtr == nil {
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return nil
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}
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fd := int(tty.Fd())
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if err := unix.IoctlSetTermios(fd, ioctlWriteTermios, origTermStatePtr); err != nil {
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return fmt.Errorf("Can't set terminal settings: %v", err)
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}
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origTermStatePtr = nil
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return nil
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}
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// listen exit signals and restore terminal state
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func catchTerminate(shutdownCh chan struct{}) {
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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 <-shutdownCh:
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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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