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-rw-r--r--sysdeps/i386/selectbits.h57
1 files changed, 57 insertions, 0 deletions
diff --git a/sysdeps/i386/selectbits.h b/sysdeps/i386/selectbits.h
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+++ b/sysdeps/i386/selectbits.h
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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_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 */