| 1 | /* Copyright (C) 1997-2016 Free Software Foundation, Inc. |
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| 2 | This file is part of the GNU C Library. |
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| 3 | |
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| 4 | The GNU C Library is free software; you can redistribute it and/or |
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| 5 | modify it under the terms of the GNU Lesser General Public |
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| 6 | License as published by the Free Software Foundation; either |
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| 7 | version 2.1 of the License, or (at your option) any later version. |
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| 8 | |
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| 9 | The GNU C Library is distributed in the hope that it will be useful, |
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| 10 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 11 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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| 12 | Lesser General Public License for more details. |
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| 13 | |
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| 14 | You should have received a copy of the GNU Lesser General Public |
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| 15 | License along with the GNU C Library; if not, see |
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| 16 | <http://www.gnu.org/licenses/>. */ |
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| 17 | |
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| 18 | #ifndef _SYS_SELECT_H |
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| 19 | # error "Never use <bits/select.h> directly; include <sys/select.h> instead." |
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| 20 | #endif |
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| 21 | |
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| 22 | #include <bits/wordsize.h> |
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| 23 | |
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| 24 | |
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| 25 | #if defined __GNUC__ && __GNUC__ >= 2 |
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| 26 | |
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| 27 | # if __WORDSIZE == 64 |
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| 28 | # define __FD_ZERO_STOS "stosq" |
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| 29 | # else |
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| 30 | # define __FD_ZERO_STOS "stosl" |
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| 31 | # endif |
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| 32 | |
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| 33 | # define __FD_ZERO(fdsp) \ |
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| 34 | do { \ |
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| 35 | int __d0, __d1; \ |
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| 36 | __asm__ __volatile__ ("cld; rep; " __FD_ZERO_STOS \ |
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| 37 | : "=c" (__d0), "=D" (__d1) \ |
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| 38 | : "a" (0), "0" (sizeof (fd_set) \ |
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| 39 | / sizeof (__fd_mask)), \ |
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| 40 | "1" (&__FDS_BITS (fdsp)[0]) \ |
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| 41 | : "memory"); \ |
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| 42 | } while (0) |
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| 43 | |
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| 44 | #else /* ! GNU CC */ |
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| 45 | |
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| 46 | /* We don't use `memset' because this would require a prototype and |
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| 47 | the array isn't too big. */ |
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| 48 | # define __FD_ZERO(set) \ |
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| 49 | do { \ |
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| 50 | unsigned int __i; \ |
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| 51 | fd_set *__arr = (set); \ |
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| 52 | for (__i = 0; __i < sizeof (fd_set) / sizeof (__fd_mask); ++__i) \ |
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| 53 | __FDS_BITS (__arr)[__i] = 0; \ |
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| 54 | } while (0) |
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| 55 | |
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| 56 | #endif /* GNU CC */ |
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| 57 | |
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| 58 | #define __FD_SET(d, set) \ |
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| 59 | ((void) (__FDS_BITS (set)[__FD_ELT (d)] |= __FD_MASK (d))) |
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| 60 | #define __FD_CLR(d, set) \ |
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| 61 | ((void) (__FDS_BITS (set)[__FD_ELT (d)] &= ~__FD_MASK (d))) |
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| 62 | #define __FD_ISSET(d, set) \ |
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| 63 | ((__FDS_BITS (set)[__FD_ELT (d)] & __FD_MASK (d)) != 0) |
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| 64 | |
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