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- /* Copyright (C) 1997, 1998, 1999, 2001 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, write to the Free
- Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
- 02111-1307 USA. */
- #ifndef _SYS_SELECT_H
- # error "Never use <bits/select.h> directly; include <sys/select.h> instead."
- #endif
- #if defined __GNUC__ && __GNUC__ >= 2
- # define __FD_ZERO(fdsp) \
- do { \
- int __d0, __d1; \
- __asm__ __volatile__ ("cld; rep; stosl" \
- : "=c" (__d0), "=D" (__d1) \
- : "a" (0), "0" (sizeof (fd_set) \
- / sizeof (__fd_mask)), \
- "1" (&__FDS_BITS (fdsp)[0]) \
- : "memory"); \
- } while (0)
- # define __FD_SET(fd, fdsp) \
- __asm__ __volatile__ ("btsl %1,%0" \
- : "=m" (__FDS_BITS (fdsp)[__FDELT (fd)]) \
- : "r" (((int) (fd)) % __NFDBITS) \
- : "cc","memory")
- # define __FD_CLR(fd, fdsp) \
- __asm__ __volatile__ ("btrl %1,%0" \
- : "=m" (__FDS_BITS (fdsp)[__FDELT (fd)]) \
- : "r" (((int) (fd)) % __NFDBITS) \
- : "cc","memory")
- # define __FD_ISSET(fd, fdsp) \
- (__extension__ \
- ({register char __result; \
- __asm__ __volatile__ ("btl %1,%2 ; setcb %b0" \
- : "=q" (__result) \
- : "r" (((int) (fd)) % __NFDBITS), \
- "m" (__FDS_BITS (fdsp)[__FDELT (fd)]) \
- : "cc"); \
- __result; }))
- #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)
- # define __FD_SET(d, set) (__FDS_BITS (set)[__FDELT (d)] |= __FDMASK (d))
- # define __FD_CLR(d, set) (__FDS_BITS (set)[__FDELT (d)] &= ~__FDMASK (d))
- # define __FD_ISSET(d, set) (__FDS_BITS (set)[__FDELT (d)] & __FDMASK (d))
- #endif /* GNU CC */
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