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Edit File: select.h
/* Copyright (C) 1997-2021 Free Software Foundation, Inc. This file is part of the GNU C Library. The GNU C Library is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by the Free Software Foundation; either version 2.1 of the License, or (at your option) any later version. The GNU C Library is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details. You should have received a copy of the GNU Lesser General Public License along with the GNU C Library; if not, see <https://www.gnu.org/licenses/>. */ #ifndef _SYS_SELECT_H # error "Never use <bits/select.h> directly; include <sys/select.h> instead." #endif /* We don't use `memset' because this would require a prototype and the array isn't too big. */ #define __FD_ZERO(s) \ do { \ unsigned int __i; \ fd_set *__arr = (s); \ for (__i = 0; __i < sizeof (fd_set) / sizeof (__fd_mask); ++__i) \ __FDS_BITS (__arr)[__i] = 0; \ } while (0) #define __FD_SET(d, s) \ ((void) (__FDS_BITS (s)[__FD_ELT(d)] |= __FD_MASK(d))) #define __FD_CLR(d, s) \ ((void) (__FDS_BITS (s)[__FD_ELT(d)] &= ~__FD_MASK(d))) #define __FD_ISSET(d, s) \ ((__FDS_BITS (s)[__FD_ELT (d)] & __FD_MASK (d)) != 0)