Line data Source code
1 : /* $OpenBSD: select.h,v 1.17 2016/09/12 19:41:20 guenther Exp $ */
2 :
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 : * @(#)select.h 8.2 (Berkeley) 1/4/94
32 : */
33 :
34 : #ifndef _SYS_SELECT_H_
35 : #define _SYS_SELECT_H_
36 :
37 : #include <sys/types.h>
38 :
39 : #ifndef _TIMEVAL_DECLARED
40 : #define _TIMEVAL_DECLARED
41 : struct timeval {
42 : time_t tv_sec; /* seconds */
43 : suseconds_t tv_usec; /* and microseconds */
44 : };
45 : #endif
46 :
47 : #ifndef _TIMESPEC_DECLARED
48 : #define _TIMESPEC_DECLARED
49 : struct timespec {
50 : time_t tv_sec; /* seconds */
51 : long tv_nsec; /* and nanoseconds */
52 : };
53 : #endif
54 :
55 : /*
56 : * Select uses bit masks of file descriptors in longs. These macros
57 : * manipulate such bit fields (the filesystem macros use chars).
58 : * FD_SETSIZE may be defined by the user, but the default here should
59 : * be enough for most uses.
60 : */
61 : #ifndef FD_SETSIZE
62 : #define FD_SETSIZE 1024
63 : #endif
64 :
65 : /*
66 : * We don't want to pollute the namespace with select(2) internals.
67 : * Non-underscore versions are exposed later #if __BSD_VISIBLE
68 : */
69 : #define __NBBY 8 /* number of bits in a byte */
70 : typedef uint32_t __fd_mask;
71 : #define __NFDBITS ((unsigned)(sizeof(__fd_mask) * __NBBY)) /* bits per mask */
72 : #define __howmany(x, y) (((x) + ((y) - 1)) / (y))
73 :
74 : typedef struct fd_set {
75 : __fd_mask fds_bits[__howmany(FD_SETSIZE, __NFDBITS)];
76 : } fd_set;
77 :
78 : static __inline void
79 0 : __fd_set(int fd, fd_set *p)
80 : {
81 0 : p->fds_bits[fd / __NFDBITS] |= (1U << (fd % __NFDBITS));
82 0 : }
83 : #define FD_SET(n, p) __fd_set((n), (p))
84 :
85 : static __inline void
86 : __fd_clr(int fd, fd_set *p)
87 : {
88 : p->fds_bits[fd / __NFDBITS] &= ~(1U << (fd % __NFDBITS));
89 : }
90 : #define FD_CLR(n, p) __fd_clr((n), (p))
91 :
92 : static __inline int
93 : __fd_isset(int fd, const fd_set *p)
94 : {
95 : return (p->fds_bits[fd / __NFDBITS] & (1U << (fd % __NFDBITS)));
96 : }
97 : #define FD_ISSET(n, p) __fd_isset((n), (p))
98 :
99 : #if __BSD_VISIBLE
100 : #define FD_COPY(f, t) (void)(*(t) = *(f))
101 : #endif
102 : #define FD_ZERO(p) do { \
103 : fd_set *_p = (p); \
104 : __size_t _n = __howmany(FD_SETSIZE, __NFDBITS); \
105 : \
106 : while (_n > 0) \
107 : _p->fds_bits[--_n] = 0; \
108 : } while (0)
109 :
110 : #if __BSD_VISIBLE
111 : #define NBBY __NBBY
112 : #define fd_mask __fd_mask
113 : #define NFDBITS __NFDBITS
114 : #ifndef howmany
115 : #define howmany(x, y) __howmany(x, y)
116 : #endif
117 : #endif /* __BSD_VISIBLE */
118 :
119 : #ifndef _KERNEL
120 : #ifndef _SIGSET_T_DEFINED_
121 : #define _SIGSET_T_DEFINED_
122 : typedef unsigned int sigset_t;
123 : #endif
124 :
125 : #ifndef _SELECT_DEFINED_
126 : #define _SELECT_DEFINED_
127 : __BEGIN_DECLS
128 : int select(int, fd_set * __restrict, fd_set * __restrict,
129 : fd_set * __restrict, struct timeval * __restrict);
130 : int pselect(int, fd_set * __restrict, fd_set * __restrict,
131 : fd_set * __restrict, const struct timespec * __restrict,
132 : const sigset_t * __restrict);
133 : __END_DECLS
134 : #endif
135 : #endif /* !_KERNEL */
136 :
137 : #endif /* !_SYS_SELECT_H_ */
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