usr/src/usr.bin/telnet/fdset.h

/*
 * Copyright (c) 1988 Regents of the University of California.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms are permitted
 * provided that this notice is preserved and that due credit is given
 * to the University of California at Berkeley. The name of the University
 * may not be used to endorse or promote products derived from this
 * software without specific prior written permission. This software
 * is provided ``as is'' without express or implied warranty.
 *
 *      @(#)fdset.h     1.3 (Berkeley) %G%
 */

/*
 * The following is defined just in case someone should want to run
 * this telnet on a 4.2 system.
 *
 */

#ifndef FD_SETSIZE

#define FD_SET(n, p)    ((p)->fds_bits[0] |= (1<<(n)))
#define FD_CLR(n, p)    ((p)->fds_bits[0] &= ~(1<<(n)))
#define FD_ISSET(n, p)  ((p)->fds_bits[0] & (1<<(n)))
#define FD_ZERO(p)      ((p)->fds_bits[0] = 0)

#endif