PORT_NONBLOCK
OK(fcntl(this->fd, F_SETFL, mode & ~PORT_NONBLOCK));
if ((mode & PORT_NONBLOCK) == 0) {
OKFREE(fcntl(fd, F_SETFL, mode | PORT_NONBLOCK), new);
(void) fcntl(del->fd, F_SETFL, mode & ~PORT_NONBLOCK);
if (mode & PORT_NONBLOCK)
OK(fcntl(fd, F_SETFL, mode | PORT_NONBLOCK));