diff options
Diffstat (limited to 'sysdeps/i386/selectbits.h')
| -rw-r--r-- | sysdeps/i386/selectbits.h | 57 |
1 files changed, 57 insertions, 0 deletions
diff --git a/sysdeps/i386/selectbits.h b/sysdeps/i386/selectbits.h new file mode 100644 index 0000000000..973ecad58e --- /dev/null +++ b/sysdeps/i386/selectbits.h @@ -0,0 +1,57 @@ +/* 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_set *) (fdsetp)) \ + : "a" (0), "c" (sizeof (__fd_set) \ + / sizeof (__fd_mask)), \ + "D" ((__fd_set *) (fdsetp)) \ + :"cx","di") +#define __FD_SET(fd, fdsetp) \ + __asm__ __volatile__ ("btsl %1,%0" \ + : "=m" (*(__fd_set *) (fdsetp)) \ + : "r" ((int) (fd))) +#define __FD_CLR(fd, fdsetp) \ + __asm__ __volatile__ ("btrl %1,%0" \ + : "=m" (*(__fd_set *) (fdsetp)) \ + : "r" ((int) (fd))) +#define __FD_ISSET(fd, fdsetp) \ + (__extension__ \ + ({unsigned char __result; \ + __asm__ __volatile__ ("btl %1,%2 ; setb %0" \ + : "=q" (__result) \ + : "r" ((int) (fd)), "m" (*(__fd_set *) (fdsetp))); \ + __result; })) + +#else /* ! GNU CC */ + +#define __FD_ZERO(set) \ + ((void) memset ((__ptr_t) (set), 0, sizeof (fd_set))) +#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 */ |