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04277e02 | 1 | /* Copyright (C) 1997-2019 Free Software Foundation, Inc. |
217d45cd UD |
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 | |
59ba27a6 PE |
15 | License along with the GNU C Library; if not, see |
16 | <http://www.gnu.org/licenses/>. */ | |
217d45cd UD |
17 | |
18 | #ifndef _SYS_SELECT_H | |
19 | # error "Never use <bits/select.h> directly; include <sys/select.h> instead." | |
20 | #endif | |
21 | ||
50e481ce UD |
22 | #include <bits/wordsize.h> |
23 | ||
217d45cd UD |
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 | ||
217d45cd UD |
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) | |
217d45cd UD |
55 | |
56 | #endif /* GNU CC */ | |
eb0b6cb6 | 57 | |
f257bbd7 | 58 | #define __FD_SET(d, set) \ |
e529793b | 59 | ((void) (__FDS_BITS (set)[__FD_ELT (d)] |= __FD_MASK (d))) |
f257bbd7 | 60 | #define __FD_CLR(d, set) \ |
e529793b | 61 | ((void) (__FDS_BITS (set)[__FD_ELT (d)] &= ~__FD_MASK (d))) |
eb0b6cb6 | 62 | #define __FD_ISSET(d, set) \ |
e529793b | 63 | ((__FDS_BITS (set)[__FD_ELT (d)] & __FD_MASK (d)) != 0) |