1 /* Copyright (C) 1997,1998,1999,2001,2008,2009 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 #include <bits/wordsize.h> 24 25 26 #if defined __GNUC__ && __GNUC__ >= 2 27 28 # if __WORDSIZE == 64 29 # define __FD_ZERO_STOS "stosq" 30 # else 31 # define __FD_ZERO_STOS "stosl" 32 # endif 33 34 # define __FD_ZERO(fdsp) \ 35 do { \ 36 int __d0, __d1; \ 37 __asm__ __volatile__ ("cld; rep; " __FD_ZERO_STOS \ 38 : "=c" (__d0), "=D" (__d1) \ 39 : "a" (0), "0" (sizeof (fd_set) \ 40 / sizeof (__fd_mask)), \ 41 "1" (&__FDS_BITS (fdsp)[0]) \ 42 : "memory"); \ 43 } while (0) 44 45 #else /* ! GNU CC */ 46 47 /* We don't use `memset' because this would require a prototype and 48 the array isn't too big. */ 49 # define __FD_ZERO(set) \ 50 do { \ 51 unsigned int __i; \ 52 fd_set *__arr = (set); \ 53 for (__i = 0; __i < sizeof (fd_set) / sizeof (__fd_mask); ++__i) \ 54 __FDS_BITS (__arr)[__i] = 0; \ 55 } while (0) 56 57 #endif /* GNU CC */ 58 59 #define __FD_SET(d, set) (__FDS_BITS (set)[__FDELT (d)] |= __FDMASK (d)) 60 #define __FD_CLR(d, set) (__FDS_BITS (set)[__FDELT (d)] &= ~__FDMASK (d)) 61 #define __FD_ISSET(d, set) \ 62 ((__FDS_BITS (set)[__FDELT (d)] & __FDMASK (d)) != 0) 63
