modernc.org/cc@v1.0.1/v2/headers/linux_arm/usr/include/arm-linux-gnueabihf/bits/select.h (about)

     1  /* Copyright (C) 1997-2016 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     <http://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  /* We don't use `memset' because this would require a prototype and
    23     the array isn't too big.  */
    24  #define __FD_ZERO(s) \
    25    do {									      \
    26      unsigned int __i;							      \
    27      fd_set *__arr = (s);						      \
    28      for (__i = 0; __i < sizeof (fd_set) / sizeof (__fd_mask); ++__i)	      \
    29        __FDS_BITS (__arr)[__i] = 0;					      \
    30    } while (0)
    31  #define __FD_SET(d, s) \
    32    ((void) (__FDS_BITS (s)[__FD_ELT(d)] |= __FD_MASK(d)))
    33  #define __FD_CLR(d, s) \
    34    ((void) (__FDS_BITS (s)[__FD_ELT(d)] &= ~__FD_MASK(d)))
    35  #define __FD_ISSET(d, s) \
    36    ((__FDS_BITS (s)[__FD_ELT (d)] & __FD_MASK (d)) != 0)