Annotation of sys/sys/select.h, Revision 1.1.1.1
1.1 nbrk 1: /* $OpenBSD: select.h,v 1.9 2006/03/21 08:17:33 otto 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/cdefs.h>
38: #include <sys/time.h> /* for types and struct timeval */
39:
40: /*
41: * Select uses bit masks of file descriptors in longs. These macros
42: * manipulate such bit fields (the filesystem macros use chars).
43: * FD_SETSIZE may be defined by the user, but the default here should
44: * be enough for most uses.
45: */
46: #ifndef FD_SETSIZE
47: #define FD_SETSIZE 1024
48: #endif
49:
50: /*
51: * We don't want to pollute the namespace with select(2) internals.
52: * Non-underscore versions are exposed later #if __BSD_VISIBLE
53: */
54: #define __NBBY 8 /* number of bits in a byte */
55: typedef int32_t __fd_mask;
56: #define __NFDBITS ((unsigned)(sizeof(__fd_mask) * __NBBY)) /* bits per mask */
57: #define __howmany(x, y) (((x) + ((y) - 1)) / (y))
58:
59: typedef struct fd_set {
60: __fd_mask fds_bits[__howmany(FD_SETSIZE, __NFDBITS)];
61: } fd_set;
62:
63: #define FD_SET(n, p) \
64: ((p)->fds_bits[(n) / __NFDBITS] |= (1 << ((n) % __NFDBITS)))
65: #define FD_CLR(n, p) \
66: ((p)->fds_bits[(n) / __NFDBITS] &= ~(1 << ((n) % __NFDBITS)))
67: #define FD_ISSET(n, p) \
68: ((p)->fds_bits[(n) / __NFDBITS] & (1 << ((n) % __NFDBITS)))
69: #ifdef _KERNEL
70: #define FD_COPY(f, t) bcopy(f, t, sizeof(*(f)))
71: #define FD_ZERO(p) bzero(p, sizeof(*(p)))
72: #else
73: #define FD_COPY(f, t) memcpy(t, f, sizeof(*(f)))
74: #define FD_ZERO(p) memset(p, 0, sizeof(*(p)))
75: #endif
76:
77: #if __BSD_VISIBLE
78: #define NBBY __NBBY
79: #define fd_mask __fd_mask
80: #define NFDBITS __NFDBITS
81: #ifndef howmany
82: #define howmany(x, y) __howmany(x, y)
83: #endif
84: #endif /* __BSD_VISIBLE */
85:
86: #ifndef _KERNEL
87: #ifndef _SELECT_DEFINED_
88: #define _SELECT_DEFINED_
89: __BEGIN_DECLS
90: struct timeval;
91: int select(int, fd_set *, fd_set *, fd_set *, struct timeval *);
92: __END_DECLS
93: #endif
94: #endif /* !_KERNEL */
95:
96: #endif /* !_SYS_SELECT_H_ */
CVSweb