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4711bccd05
This fixes a race condition in runc/systemd at container creation time opencontainers/runc#1683 Signed-off-by: vikaschoudhary16 <vichoudh@redhat.com>
38 lines
854 B
Go
38 lines
854 B
Go
package console
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import (
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"fmt"
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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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const (
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cmdTcGet = unix.TIOCGETA
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cmdTcSet = unix.TIOCSETA
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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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// unlockpt unlocks the slave pseudoterminal device corresponding to the master pseudoterminal referred to by f.
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// unlockpt should be called before opening the slave side of a pty.
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func unlockpt(f *os.File) error {
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var u int32
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return ioctl(f.Fd(), unix.TIOCPTYUNLK, uintptr(unsafe.Pointer(&u)))
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}
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// ptsname retrieves the name of the first available pts for the given master.
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func ptsname(f *os.File) (string, error) {
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n, err := unix.IoctlGetInt(int(f.Fd()), unix.TIOCPTYGNAME)
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if err != nil {
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return "", err
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}
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return fmt.Sprintf("/dev/pts/%d", n), nil
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}
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