| /* Copyright (C) 1997, 1998, 1999, 2001, 2011 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 Lesser General Public |
| License as published by the Free Software Foundation; either |
| version 2.1 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 |
| Lesser General Public License for more details. |
| |
| You should have received a copy of the GNU Lesser General Public |
| License along with the GNU C Library; 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) |
| |
| #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) |
| |
| #endif /* GNU CC */ |
| |
| #define __FD_SET(d, set) \ |
| ((void) (__FDS_BITS (set)[__FD_ELT (d)] |= __FD_MASK (d))) |
| #define __FD_CLR(d, set) \ |
| ((void) (__FDS_BITS (set)[__FD_ELT (d)] &= ~__FD_MASK (d))) |
| #define __FD_ISSET(d, set) \ |
| ((__FDS_BITS (set)[__FD_ELT (d)] & __FD_MASK (d)) != 0) |
