.
[glibc/history.git] / bits / select.h
blob47e7dedc30e6f410587e3d51c53ed90593725aa9
1 /* Copyright (C) 1997, 1998, 2001 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
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.
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.
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. */
19 #ifndef _SYS_SELECT_H
20 # error "Never use <bits/select.h> directly; include <sys/select.h> instead."
21 #endif
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)