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8e647fe974
The update allows redirecting the VMs output. Signed-off-by: Rolf Neugebauer <rolf.neugebauer@docker.com>
71 lines
1.8 KiB
Go
71 lines
1.8 KiB
Go
package hyperkit
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/*
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Most of this code was copied and adjusted from:
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https://github.com/containerd/console
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which is under Apache License Version 2.0, January 2004
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*/
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import (
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"os"
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"unsafe"
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"golang.org/x/sys/unix"
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)
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func tcget(fd uintptr, p *unix.Termios) error {
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return ioctl(fd, unix.TIOCGETA, uintptr(unsafe.Pointer(p)))
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}
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func tcset(fd uintptr, p *unix.Termios) error {
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return ioctl(fd, unix.TIOCSETA, uintptr(unsafe.Pointer(p)))
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}
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func ioctl(fd, flag, data uintptr) error {
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if _, _, err := unix.Syscall(unix.SYS_IOCTL, fd, flag, data); 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 saneTerminal(f *os.File) error {
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// Go doesn't have a wrapper for any of the termios ioctls.
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var termios unix.Termios
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if err := tcget(f.Fd(), &termios); err != nil {
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return err
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}
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// Set -onlcr so we don't have to deal with \r.
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termios.Oflag &^= unix.ONLCR
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return tcset(f.Fd(), &termios)
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}
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func setRaw(f *os.File) error {
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var termios unix.Termios
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if err := tcget(f.Fd(), &termios); err != nil {
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return err
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}
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termios = cfmakeraw(termios)
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termios.Oflag = termios.Oflag | unix.OPOST
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return tcset(f.Fd(), &termios)
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}
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// isTerminal checks if the provided file is a terminal
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func isTerminal(f *os.File) bool {
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var termios unix.Termios
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if tcget(f.Fd(), &termios) != nil {
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return false
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}
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return true
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}
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func cfmakeraw(t unix.Termios) unix.Termios {
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t.Iflag = uint64(uint32(t.Iflag) & ^uint32((unix.IGNBRK | unix.BRKINT | unix.PARMRK | unix.ISTRIP | unix.INLCR | unix.IGNCR | unix.ICRNL | unix.IXON)))
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t.Oflag = uint64(uint32(t.Oflag) & ^uint32(unix.OPOST))
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t.Lflag = uint64(uint32(t.Lflag) & ^(uint32(unix.ECHO | unix.ECHONL | unix.ICANON | unix.ISIG | unix.IEXTEN)))
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t.Cflag = uint64(uint32(t.Cflag) & ^(uint32(unix.CSIZE | unix.PARENB)))
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t.Cflag = t.Cflag | unix.CS8
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t.Cc[unix.VMIN] = 1
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t.Cc[unix.VTIME] = 0
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return t
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}
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