1 /* Copyright (C) 1997, 1998, 1999, 2001, 2011 Free Software Foundation, Inc. 2 This file is part of the GNU C Library. 3 4 The GNU C Library is free software; you can redistribute it and/or 5 modify it under the terms of the GNU Lesser General Public 6 License as published by the Free Software Foundation; either 7 version 2.1 of the License, or (at your option) any later version. 8 9 The GNU C Library is distributed in the hope that it will be useful, 10 but WITHOUT ANY WARRANTY; without even the implied warranty of 11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 12 Lesser General Public License for more details. 13 14 You should have received a copy of the GNU Lesser General Public 15 License along with the GNU C Library; if not, write to the Free 16 Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 17 02111-1307 USA. */ 18 19 #ifndef _SYS_SELECT_H 20 # error "Never use <bits/select.h> directly; include <sys/select.h> instead." 21 #endif 22 23 24 #if defined __GNUC__ && __GNUC__ >= 2 25 # define __FD_ZERO(fdsp) \ 26 do { \ 27 int __d0, __d1; \ 28 __asm__ __volatile__ ("cld; rep; stosl" \ 29 : "=c" (__d0), "=D" (__d1) \ 30 : "a" (0), "0" (sizeof (fd_set) \ 31 / sizeof (__fd_mask)), \ 32 "1" (&__FDS_BITS (fdsp)[0]) \ 33 : "memory"); \ 34 } while (0) 35 36 #else /* ! GNU CC */ 37 38 /* We don't use `memset' because this would require a prototype and 39 the array isn't too big. */ 40 # define __FD_ZERO(set) \ 41 do { \ 42 unsigned int __i; \ 43 fd_set *__arr = (set); \ 44 for (__i = 0; __i < sizeof (fd_set) / sizeof (__fd_mask); ++__i) \ 45 __FDS_BITS (__arr)[__i] = 0; \ 46 } while (0) 47 48 #endif /* GNU CC */ 49 50 #define __FD_SET(d, set) \ 51 ((void) (__FDS_BITS (set)[__FD_ELT (d)] |= __FD_MASK (d))) 52 #define __FD_CLR(d, set) \ 53 ((void) (__FDS_BITS (set)[__FD_ELT (d)] &= ~__FD_MASK (d))) 54 #define __FD_ISSET(d, set) \ 55 ((__FDS_BITS (set)[__FD_ELT (d)] & __FD_MASK (d)) != 0) 56
