sysdeps/generic/bits/select.h

   1 /* Copyright (C) 1997, 1998 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 Library General Public License as
   6    published by the Free Software Foundation; either version 2 of the
   7    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    Library General Public License for more details.
  13
  14    You should have received a copy of the GNU Library General Public
  15    License along with the GNU C Library; see the file COPYING.LIB.  If not,
  16    write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  17    Boston, MA 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 #ifdef __USE_XOPEN
  27 # define __FD_ZERO(s) \
  28   do {                                                                        \
  29     unsigned int __i;                                                         \
  30     __fd_set *__arr = (s);                                                    \
  31     for (__i = 0; __i < sizeof (__fd_set) / sizeof (__fd_mask); ++__i)        \
  32       __arr->fds_bits[__i] = '\0';                                            \
  33   } while (0)
  34 # define __FD_SET(d, s)     ((s)->fds_bits[__FDELT(d)] |= __FDMASK(d))
  35 # define __FD_CLR(d, s)     ((s)->fds_bits[__FDELT(d)] &= ~__FDMASK(d))
  36 # define __FD_ISSET(d, s)   (((s)->fds_bits[__FDELT(d)] & __FDMASK(d)) != 0)
  37 #else
  38 # define __FD_ZERO(s) \
  39   do {                                                                        \
  40     unsigned int __i;                                                         \
  41     __fd_set *__arr = (s);                                                    \
  42     for (__i = 0; __i < sizeof (__fd_set) / sizeof (__fd_mask); ++__i)        \
  43       __arr->__fds_bits[__i] = '\0';                                          \
  44   } while (0)
  45 # define __FD_SET(d, s)     ((s)->__fds_bits[__FDELT(d)] |= __FDMASK(d))
  46 # define __FD_CLR(d, s)     ((s)->__fds_bits[__FDELT(d)] &= ~__FDMASK(d))
  47 # define __FD_ISSET(d, s)   (((s)->__fds_bits[__FDELT(d)] & __FDMASK(d)) != 0)
  48 #endif