| xf.li | bfc6e71 | 2025-02-07 01:54:34 -0800 | [diff] [blame^] | 1 | /* Copyright (C) 1997-2016 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, see |
| 16 | <http://www.gnu.org/licenses/>. */ |
| 17 | |
| 18 | #ifndef _SYS_SELECT_H |
| 19 | # error "Never use <bits/select.h> directly; include <sys/select.h> instead." |
| 20 | #endif |
| 21 | |
| 22 | #include <bits/wordsize.h> |
| 23 | |
| 24 | |
| 25 | #if defined __GNUC__ && __GNUC__ >= 2 |
| 26 | |
| 27 | # if __WORDSIZE == 64 |
| 28 | # define __FD_ZERO_STOS "stosq" |
| 29 | # else |
| 30 | # define __FD_ZERO_STOS "stosl" |
| 31 | # endif |
| 32 | |
| 33 | # define __FD_ZERO(fdsp) \ |
| 34 | do { \ |
| 35 | int __d0, __d1; \ |
| 36 | __asm__ __volatile__ ("cld; rep; " __FD_ZERO_STOS \ |
| 37 | : "=c" (__d0), "=D" (__d1) \ |
| 38 | : "a" (0), "0" (sizeof (fd_set) \ |
| 39 | / sizeof (__fd_mask)), \ |
| 40 | "1" (&__FDS_BITS (fdsp)[0]) \ |
| 41 | : "memory"); \ |
| 42 | } while (0) |
| 43 | |
| 44 | #else /* ! GNU CC */ |
| 45 | |
| 46 | /* We don't use `memset' because this would require a prototype and |
| 47 | the array isn't too big. */ |
| 48 | # define __FD_ZERO(set) \ |
| 49 | do { \ |
| 50 | unsigned int __i; \ |
| 51 | fd_set *__arr = (set); \ |
| 52 | for (__i = 0; __i < sizeof (fd_set) / sizeof (__fd_mask); ++__i) \ |
| 53 | __FDS_BITS (__arr)[__i] = 0; \ |
| 54 | } while (0) |
| 55 | |
| 56 | #endif /* GNU CC */ |
| 57 | |
| 58 | #define __FD_SET(d, set) \ |
| 59 | ((void) (__FDS_BITS (set)[__FD_ELT (d)] |= __FD_MASK (d))) |
| 60 | #define __FD_CLR(d, set) \ |
| 61 | ((void) (__FDS_BITS (set)[__FD_ELT (d)] &= ~__FD_MASK (d))) |
| 62 | #define __FD_ISSET(d, set) \ |
| 63 | ((__FDS_BITS (set)[__FD_ELT (d)] & __FD_MASK (d)) != 0) |