static int sock_fd = -1; /* socket for doing interface ioctls */
static int slave_fd = -1; /* pty for old-style demand mode, slave */
static int master_fd = -1; /* pty for old-style demand mode, master */
static int sock_fd = -1; /* socket for doing interface ioctls */
static int slave_fd = -1; /* pty for old-style demand mode, slave */
static int master_fd = -1; /* pty for old-style demand mode, master */