1: /* Copyright (C) 1997, 1998, 2001 Free Software Foundation, Inc.
    2:    This file is part of the GNU C Library.
    3: 
    4:    The GNU C Library is free software; you can redistribute it and/or
    5:    modify it under the terms of the GNU Lesser General Public
    6:    License as published by the Free Software Foundation; either
    7:    version 2.1 of the License, or (at your option) any later version.
    8: 
    9:    The GNU C Library is distributed in the hope that it will be useful,
   10:    but WITHOUT ANY WARRANTY; without even the implied warranty of
   11:    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   12:    Lesser General Public License for more details.
   13: 
   14:    You should have received a copy of the GNU Lesser General Public
   15:    License along with the GNU C Library; if not, write to the Free
   16:    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
   17:    02111-1307 USA.  */
   18: 
   19: #ifndef _SYS_SELECT_H
   20: # error "Never use <bits/select.h> directly; include <sys/select.h> instead."
   21: #endif
   22: 
   23: 
   24: /* We don't use `memset' because this would require a prototype and
   25:    the array isn't too big.  */
   26: #define __FD_ZERO(s) \
   27:   do {                                                                        \
   28:     unsigned int __i;                                                         \
   29:     fd_set *__arr = (s);                                                      \
   30:     for (__i = 0; __i < sizeof (fd_set) / sizeof (__fd_mask); ++__i)          \
   31:       __FDS_BITS (__arr)[__i] = 0;                                            \
   32:   } while (0)
   33: #define __FD_SET(d, s)     (__FDS_BITS (s)[__FDELT(d)] |= __FDMASK(d))
   34: #define __FD_CLR(d, s)     (__FDS_BITS (s)[__FDELT(d)] &= ~__FDMASK(d))
   35: #define __FD_ISSET(d, s)   ((__FDS_BITS (s)[__FDELT(d)] & __FDMASK(d)) != 0)