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58 lines
2.1 KiB
C
58 lines
2.1 KiB
C
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/* Copyright (C) 1997 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Library General Public License as
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published by the Free Software Foundation; either version 2 of the
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License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with the GNU C Library; see the file COPYING.LIB. If not,
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write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA. */
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#ifndef _SELECTBITS_H
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#define _SELECTBITS_H 1
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#if defined __GNUC__ && __GNUC__ >= 2
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#define __FD_ZERO(fdsetp) \
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__asm__ __volatile__ ("cld ; rep ; stosl" \
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: "=m" (*(__fd_set *) (fdsetp)) \
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: "a" (0), "c" (sizeof (__fd_set) \
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/ sizeof (__fd_mask)), \
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"D" ((__fd_set *) (fdsetp)) \
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:"cx","di")
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#define __FD_SET(fd, fdsetp) \
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__asm__ __volatile__ ("btsl %1,%0" \
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: "=m" (*(__fd_set *) (fdsetp)) \
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: "r" ((int) (fd)))
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#define __FD_CLR(fd, fdsetp) \
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__asm__ __volatile__ ("btrl %1,%0" \
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: "=m" (*(__fd_set *) (fdsetp)) \
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: "r" ((int) (fd)))
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#define __FD_ISSET(fd, fdsetp) \
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(__extension__ \
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({unsigned char __result; \
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__asm__ __volatile__ ("btl %1,%2 ; setb %0" \
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: "=q" (__result) \
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: "r" ((int) (fd)), "m" (*(__fd_set *) (fdsetp))); \
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__result; }))
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#else /* ! GNU CC */
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#define __FD_ZERO(set) \
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((void) memset ((__ptr_t) (set), 0, sizeof (fd_set)))
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#define __FD_SET(d, set) ((set)->fds_bits[__FDELT(d)] |= __FDMASK(d))
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#define __FD_CLR(d, set) ((set)->fds_bits[__FDELT(d)] &= ~__FDMASK(d))
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#define __FD_ISSET(d, set) ((set)->fds_bits[__FDELT(d)] & __FDMASK(d))
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#endif /* GNU CC */
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#endif /* selectbits.h */
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