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
__fd_set(int fd,fd_set * p)79 __fd_set(int fd, fd_set *p)
80 {
81 p->fds_bits[fd / __NFDBITS] |= (1U << (fd % __NFDBITS));
82 }
83 #define FD_SET(n, p) __fd_set((n), (p))
84
85 static __inline void
__fd_clr(int fd,fd_set * p)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
__fd_isset(int fd,const fd_set * p)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_ */
138