1/* Copyright (C) 1997-2022 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, see
16 <https://www.gnu.org/licenses/>. */
17
18#ifndef _SYS_SELECT_H
19# error "Never use <bits/select.h> directly; include <sys/select.h> instead."
20#endif
21
22
23/* We don't use `memset' because this would require a prototype and
24 the array isn't too big. */
25#define __FD_ZERO(s) \
26 do { \
27 unsigned int __i; \
28 fd_set *__arr = (s); \
29 for (__i = 0; __i < sizeof (fd_set) / sizeof (__fd_mask); ++__i) \
30 __FDS_BITS (__arr)[__i] = 0; \
31 } while (0)
32#define __FD_SET(d, s) \
33 ((void) (__FDS_BITS (s)[__FD_ELT(d)] |= __FD_MASK(d)))
34#define __FD_CLR(d, s) \
35 ((void) (__FDS_BITS (s)[__FD_ELT(d)] &= ~__FD_MASK(d)))
36#define __FD_ISSET(d, s) \
37 ((__FDS_BITS (s)[__FD_ELT (d)] & __FD_MASK (d)) != 0)
38