diff options
Diffstat (limited to 'libc/sysdeps/linux/i386/bits/select.h')
| -rw-r--r-- | libc/sysdeps/linux/i386/bits/select.h | 72 |
1 files changed, 72 insertions, 0 deletions
diff --git a/libc/sysdeps/linux/i386/bits/select.h b/libc/sysdeps/linux/i386/bits/select.h new file mode 100644 index 000000000..6acfc5b9a --- /dev/null +++ b/libc/sysdeps/linux/i386/bits/select.h @@ -0,0 +1,72 @@ +/* Copyright (C) 1997, 1998, 1999 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 _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 */ |