Function openpty

Lib/pty.py:26–46

openpty() -> (master_fd, slave_fd) Open a pty master/slave pair, using os.openpty() if possible.

()

CHILD = 0

def openpty():
    """openpty() -> (master_fd, slave_fd)
    Open a pty master/slave pair, using os.openpty() if possible."""

    try:
        return os.openpty()
    except (AttributeError, OSError):
        pass
    master_fd, slave_name = _open_terminal()

    slave_fd = os.open(slave_name, os.O_RDWR)
    try:
        from fcntl import ioctl, I_PUSH
    except ImportError:
         return master_fd, slave_fd
    try:
        ioctl(slave_fd, I_PUSH, "ptem")
        ioctl(slave_fd, I_PUSH, "ldterm")
    except OSError:
        pass
    return master_fd, slave_fd

def _open_terminal():
    """Open pty master and return (master_fd, tty_name)."""