cri-o/vendor/github.com/containerd/console/tc_linux.go
Mrunal Patel 970b8d61a7 test: Bump up runc to 9f9c96235cc97674e935002fc3d78361b696a69e
This brings in a fix for a cgroups setup race condition
that we hit sometimes in the tests.

Signed-off-by: Mrunal Patel <mrunalp@gmail.com>
2018-01-23 11:06:21 -08:00

37 lines
845 B
Go

package console
import (
"fmt"
"os"
"unsafe"
"golang.org/x/sys/unix"
)
const (
cmdTcGet = unix.TCGETS
cmdTcSet = unix.TCSETS
)
func ioctl(fd, flag, data uintptr) error {
if _, _, err := unix.Syscall(unix.SYS_IOCTL, fd, flag, data); err != 0 {
return err
}
return nil
}
// unlockpt unlocks the slave pseudoterminal device corresponding to the master pseudoterminal referred to by f.
// unlockpt should be called before opening the slave side of a pty.
func unlockpt(f *os.File) error {
var u int32
return ioctl(f.Fd(), unix.TIOCSPTLCK, uintptr(unsafe.Pointer(&u)))
}
// ptsname retrieves the name of the first available pts for the given master.
func ptsname(f *os.File) (string, error) {
n, err := unix.IoctlGetInt(int(f.Fd()), unix.TIOCGPTN)
if err != nil {
return "", err
}
return fmt.Sprintf("/dev/pts/%d", n), nil
}