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