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