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/* Copyright (C) 1997-2018 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
<http://www.gnu.org/licenses/>. */
#ifndef _SYS_SELECT_H
# error "Never use <bits/select.h> directly; include <sys/select.h> instead."
#endif
#include <bits/wordsize.h>
#if defined __GNUC__ && __GNUC__ >= 2
# if __WORDSIZE == 64
# define __FD_ZERO_STOS "stosq"
# else
# define __FD_ZERO_STOS "stosl"
# endif
# define __FD_ZERO(fdsp) \
do { \
int __d0, __d1; \
__asm__ __volatile__ ("cld; rep; " __FD_ZERO_STOS \
: "=c" (__d0), "=D" (__d1) \
: "a" (0), "0" (sizeof (fd_set) \
/ sizeof (__fd_mask)), \
"1" (&__FDS_BITS (fdsp)[0]) \
: "memory"); \
} while (0)
#else /* ! GNU CC */
/* We don't use `memset' because this would require a prototype and
the array isn't too big. */
# define __FD_ZERO(set) \
do { \
unsigned int __i; \
fd_set *__arr = (set); \
for (__i = 0; __i < sizeof (fd_set) / sizeof (__fd_mask); ++__i) \
__FDS_BITS (__arr)[__i] = 0; \
} while (0)
#endif /* GNU CC */
#define __FD_SET(d, set) \
((void) (__FDS_BITS (set)[__FD_ELT (d)] |= __FD_MASK (d)))
#define __FD_CLR(d, set) \
((void) (__FDS_BITS (set)[__FD_ELT (d)] &= ~__FD_MASK (d)))
#define __FD_ISSET(d, set) \
((__FDS_BITS (set)[__FD_ELT (d)] & __FD_MASK (d)) != 0)