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/* Copyright (C) 1997 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 Library General Public License as
published by the Free Software Foundation; either version 2 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
Library General Public License for more details.
You should have received a copy of the GNU Library General Public
License along with the GNU C Library; see the file COPYING.LIB. If not,
write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA. */
#ifndef _SELECTBITS_H
#define _SELECTBITS_H 1
#if defined __GNUC__ && __GNUC__ >= 2
# define __FD_ZERO(fdsetp) \
__asm__ __volatile__ ("cld; rep; stosl" \
: "=m" (((__fd_mask *) \
(fdsetp))[__FDELT (__FD_SETSIZE)]) \
: "a" (0), "c" (sizeof (__fd_set) \
/ sizeof (__fd_mask)), \
"D" ((__fd_mask *) (fdsetp)) \
:"cx","di")
# define __FD_SET(fd, fdsetp) \
__asm__ __volatile__ ("btsl %1,%0" \
: "=m" (((__fd_mask *) (fdsetp))[__FDELT (fd)]) \
: "r" (((int) (fd)) % __NFDBITS) \
: "cc")
# define __FD_CLR(fd, fdsetp) \
__asm__ __volatile__ ("btrl %1,%0" \
: "=m" (((__fd_mask *) (fdsetp))[__FDELT (fd)]) \
: "r" (((int) (fd)) % __NFDBITS) \
: "cc")
# define __FD_ISSET(fd, fdsetp) \
(__extension__ \
({register char __result; \
__asm__ __volatile__ ("btl %1,%2 ; setcb %b0" \
: "=q" (__result) \
: "r" (((int) (fd)) % __NFDBITS), \
"m" (((__fd_mask *) (fdsetp))[__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; \
for (__i = 0; __i < sizeof (__fd_set) / sizeof (__fd_mask); ++__i) \
((__fd_mask *) set)[__i] = 0; \
} while (0)
# define __FD_SET(d, set) ((set)->fds_bits[__FDELT(d)] |= __FDMASK(d))
# define __FD_CLR(d, set) ((set)->fds_bits[__FDELT(d)] &= ~__FDMASK(d))
# define __FD_ISSET(d, set) ((set)->fds_bits[__FDELT(d)] & __FDMASK(d))
#endif /* GNU CC */
#endif /* selectbits.h */
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