1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
|
/* Copyright (C) 1997 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public License as
published by the Free Software Foundation; either version 2 of the
License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Library General Public License for more details.
You should have received a copy of the GNU Library General Public
License along with the GNU C Library; see the file COPYING.LIB. If not,
write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA. */
#ifndef _SYS_SELECT_H
#error "Never use <bits/select.h> directly; include <sys/select.h> instead."
#endif
#if defined __GNUC__ && __GNUC__ >= 2
# define __FD_ZERO(fdsetp) \
__asm__ __volatile__ ("cld ; rep ; stosl" \
: "=m" (*(__fd_set *) (fdsetp)) \
: "a" (0), "c" (sizeof (__fd_set) \
/ sizeof (__fd_mask)), \
"D" ((__fd_set *) (fdsetp)) \
:"cx","di")
# define __FD_SET(fd, fdsetp) \
__asm__ __volatile__ ("btsl %1,%0" \
: "=m" (((__fd_set *) (fdsetp))[__FDELT (fd)]) \
: "r" (((int) (fd)) % __NFDBITS) \
: "cc")
# define __FD_CLR(fd, fdsetp) \
__asm__ __volatile__ ("btrl %1,%0" \
: "=m" (((__fd_set *) (fdsetp))[__FDELT (fd)]) \
: "r" (((int) (fd)) % __NFDBITS) \
: "cc")
# define __FD_ISSET(fd, fdsetp) \
(__extension__ \
({unsigned int __result; \
__asm__ __volatile__ ("btl %1,%2 ; setcb %b0; andl $1,%0" \
: "=q" (__result) \
: "r" (((int) (fd)) % __NFDBITS), \
"m" (((__fd_set *) (fdsetp))[__FDELT (fd)]) \
: "cc"); \
__result; }))
#else /* ! GNU CC */
/* We don't use `memset' because this would require a prototype and
the array isn't too big. */
# define __FD_ZERO(set) \
do { \
unsigned int __i; \
for (__i = 0; __i < sizeof (__fd_set) / sizeof (__fd_mask); ++__i) \
((__fd_mask *) set)[__i] = 0; \
} while (0)
# define __FD_SET(d, set) ((set)->fds_bits[__FDELT (d)] |= __FDMASK (d))
# define __FD_CLR(d, set) ((set)->fds_bits[__FDELT (d)] &= ~__FDMASK (d))
# define __FD_ISSET(d, set) ((set)->fds_bits[__FDELT (d)] & __FDMASK (d))
#endif /* GNU CC */
|
