1 | /* Copyright (C) 1997-2019 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) |
64 | |