FreeBSD/Linux Kernel Cross Reference
sys/sys/select.h
1 /*-
2 * Copyright (c) 1992, 1993
3 * The Regents of the University of California. All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 3. All advertising materials mentioning features or use of this software
14 * must display the following acknowledgement:
15 * This product includes software developed by the University of
16 * California, Berkeley and its contributors.
17 * 4. Neither the name of the University nor the names of its contributors
18 * may be used to endorse or promote products derived from this software
19 * without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
32 *
33 * $FreeBSD: releng/5.1/sys/sys/select.h 108478 2002-12-31 04:13:50Z mike $
34 */
35
36 #ifndef _SYS_SELECT_H_
37 #define _SYS_SELECT_H_
38
39 #include <sys/cdefs.h>
40 #include <sys/_types.h>
41
42 #include <sys/_sigset.h>
43 #include <sys/_timeval.h>
44 #include <sys/timespec.h>
45
46 typedef unsigned long __fd_mask;
47 #if __BSD_VISIBLE
48 typedef __fd_mask fd_mask;
49 #endif
50
51 #ifndef _SIGSET_T_DECLARED
52 #define _SIGSET_T_DECLARED
53 typedef __sigset_t sigset_t;
54 #endif
55
56 /*
57 * Select uses bit masks of file descriptors in longs. These macros
58 * manipulate such bit fields (the filesystem macros use chars).
59 * FD_SETSIZE may be defined by the user, but the default here should
60 * be enough for most uses.
61 */
62 #ifndef FD_SETSIZE
63 #define FD_SETSIZE 1024U
64 #endif
65
66 #define _NFDBITS (sizeof(__fd_mask) * 8) /* bits per mask */
67 #if __BSD_VISIBLE
68 #define NFDBITS _NFDBITS
69 #endif
70
71 #ifndef _howmany
72 #define _howmany(x, y) (((x) + ((y) - 1)) / (y))
73 #endif
74
75 typedef struct fd_set {
76 __fd_mask __fds_bits[_howmany(FD_SETSIZE, _NFDBITS)];
77 } fd_set;
78 #if __BSD_VISIBLE
79 #define fds_bits __fds_bits
80 #endif
81
82 #define __fdset_mask(n) ((__fd_mask)1 << ((n) % _NFDBITS))
83 #define FD_CLR(n, p) ((p)->__fds_bits[(n)/_NFDBITS] &= ~__fdset_mask(n))
84 #if __BSD_VISIBLE
85 #define FD_COPY(f, t) (void)(*(t) = *(f))
86 #endif
87 #define FD_ISSET(n, p) ((p)->__fds_bits[(n)/_NFDBITS] & __fdset_mask(n))
88 #define FD_SET(n, p) ((p)->__fds_bits[(n)/_NFDBITS] |= __fdset_mask(n))
89 #define FD_ZERO(p) do { \
90 fd_set *_p; \
91 __size_t _n; \
92 \
93 _p = (p); \
94 _n = _howmany(FD_SETSIZE, _NFDBITS); \
95 while (_n > 0) \
96 _p->__fds_bits[--_n] = 0; \
97 } while (0)
98
99 #ifndef _KERNEL
100
101 __BEGIN_DECLS
102 int pselect(int, fd_set *__restrict, fd_set *__restrict, fd_set *__restrict,
103 const struct timespec *__restrict, const sigset_t *__restrict);
104 #ifndef _SELECT_DECLARED
105 #define _SELECT_DECLARED
106 /* XXX missing restrict type-qualifier */
107 int select(int, fd_set *, fd_set *, fd_set *, struct timeval *);
108 #endif
109 __END_DECLS
110 #endif /* !_KERNEL */
111
112 #endif /* _SYS_SELECT_H_ */
Cache object: ab081f01a5a8498dd22a82bdad619690
|