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- /* Copyright (C) 1997-2016 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)
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