xref: /illumos-gate/usr/src/uts/common/sys/select.h (revision 2209d3c850d80c0681948f966816f28f767575cb)
1 /*
2  * CDDL HEADER START
3  *
4  * The contents of this file are subject to the terms of the
5  * Common Development and Distribution License (the "License").
6  * You may not use this file except in compliance with the License.
7  *
8  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9  * or http://www.opensolaris.org/os/licensing.
10  * See the License for the specific language governing permissions
11  * and limitations under the License.
12  *
13  * When distributing Covered Code, include this CDDL HEADER in each
14  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15  * If applicable, add the following below this CDDL HEADER, with the
16  * fields enclosed by brackets "[]" replaced with your own identifying
17  * information: Portions Copyright [yyyy] [name of copyright owner]
18  *
19  * CDDL HEADER END
20  */
21 
22 /*
23  * Copyright 2014 Garrett D'Amore <garrett@damore.org>
24  *
25  * Copyright 2013 Nexenta Systems, Inc.  All rights reserved.
26  *
27  * Copyright 2010 Sun Microsystems, Inc.  All rights reserved.
28  * Use is subject to license terms.
29  */
30 
31 /*	Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T	*/
32 /*	  All Rights Reserved	*/
33 
34 /*
35  * University Copyright- Copyright (c) 1982, 1986, 1988
36  * The Regents of the University of California
37  * All Rights Reserved
38  *
39  * University Acknowledgment- Portions of this document are derived from
40  * software developed by the University of California, Berkeley, and its
41  * contributors.
42  */
43 
44 #ifndef _SYS_SELECT_H
45 #define	_SYS_SELECT_H
46 
47 #include <sys/feature_tests.h>
48 
49 #if !defined(_KERNEL) && !defined(_FAKE_KERNEL)
50 #if !defined(__XOPEN_OR_POSIX) || defined(_XPG6) || defined(__EXTENSIONS__)
51 #include <sys/time_impl.h>
52 #endif
53 #include <sys/time.h>
54 #endif /* !_KERNEL */
55 
56 #ifdef	__cplusplus
57 extern "C" {
58 #endif
59 
60 
61 #if !defined(__XOPEN_OR_POSIX) || defined(_XPG6) || defined(__EXTENSIONS__)
62 /*
63  * The sigset_t type is defined in <sys/signal.h> and duplicated
64  * in <sys/ucontext.h> as a result of XPG4v2 requirements. XPG6
65  * now allows the visibility of signal.h in this header, however
66  * an order of inclusion problem occurs as a result of inclusion
67  * of <sys/select.h> in <signal.h> under certain conditions.
68  * Rather than include <sys/signal.h> here, we've duplicated
69  * the sigset_t type instead. This type is required for the XPG6
70  * introduced pselect() function also declared in this header.
71  */
72 #ifndef	_SIGSET_T
73 #define	_SIGSET_T
74 typedef struct {		/* signal set type */
75 	unsigned int	__sigbits[4];
76 } sigset_t;
77 #endif  /* _SIGSET_T */
78 
79 #endif /* #if !defined(__XOPEN_OR_POSIX) || defined(_XPG6) ... */
80 
81 /*
82  * Select uses bit masks of file descriptors in longs.
83  * These macros manipulate such bit fields.
84  * FD_SETSIZE may be defined by the user, but the default here
85  * should be >= RLIM_FD_MAX.
86  */
87 #ifndef	FD_SETSIZE
88 #define	FD_SETSIZE	65536
89 #endif	/* FD_SETSIZE */
90 
91 #if !defined(_XPG4_2) || defined(__EXTENSIONS__)
92 typedef	long	fd_mask;
93 #endif
94 typedef	long	fds_mask;
95 
96 /*
97  *  The value of _NBBY needs to be consistant with the value
98  *  of NBBY in <sys/param.h>.
99  */
100 #define	_NBBY 8
101 #if !defined(_XPG4_2) || defined(__EXTENSIONS__)
102 #ifndef NBBY		/* number of bits per byte */
103 #define	NBBY _NBBY
104 #endif
105 #endif /* !defined(_XPG4_2) || defined(__EXTENSIONS__) */
106 
107 #if !defined(_XPG4_2) || defined(__EXTENSIONS__)
108 #define	NFDBITS		(sizeof (fd_mask) * NBBY)	/* bits per mask */
109 #endif
110 #define	FD_NFDBITS	(sizeof (fds_mask) * _NBBY)	/* bits per mask */
111 
112 #define	__howmany(__x, __y)	(((__x)+((__y)-1))/(__y))
113 #if !defined(_XPG4_2) || defined(__EXTENSIONS__)
114 #ifndef	howmany
115 #define	howmany(x, y)	(((x)+((y)-1))/(y))
116 #endif
117 #endif /* !defined(_XPG4_2) || defined(__EXTENSIONS__) */
118 
119 #if !defined(_XPG4_2) || defined(__EXTENSIONS__)
120 typedef	struct fd_set {
121 #else
122 typedef	struct __fd_set {
123 #endif
124 	long	fds_bits[__howmany(FD_SETSIZE, FD_NFDBITS)];
125 } fd_set;
126 
127 #define	FD_SET(__n, __p)	((__p)->fds_bits[(__n)/FD_NFDBITS] |= \
128 				    (1ul << ((__n) % FD_NFDBITS)))
129 
130 #define	FD_CLR(__n, __p)	((__p)->fds_bits[(__n)/FD_NFDBITS] &= \
131 				    ~(1ul << ((__n) % FD_NFDBITS)))
132 
133 #define	FD_ISSET(__n, __p)	(((__p)->fds_bits[(__n)/FD_NFDBITS] & \
134 				    (1ul << ((__n) % FD_NFDBITS))) != 0l)
135 
136 #if defined(_KERNEL) || defined(_FAKE_KERNEL)
137 #define	FD_ZERO(p)	bzero((p), sizeof (*(p)))
138 #else
139 #define	FD_ZERO(__p)    (void) memset((__p), 0, sizeof (*(__p)))
140 #endif /* _KERNEL */
141 
142 #if !defined(_KERNEL) && !defined(_FAKE_KERNEL)
143 extern int select(int, fd_set *_RESTRICT_KYWD, fd_set *_RESTRICT_KYWD,
144 	fd_set *_RESTRICT_KYWD, struct timeval *_RESTRICT_KYWD);
145 
146 #if !defined(__XOPEN_OR_POSIX) || defined(_XPG6) || defined(__EXTENSIONS__)
147 extern int pselect(int, fd_set *_RESTRICT_KYWD, fd_set *_RESTRICT_KYWD,
148 	fd_set *_RESTRICT_KYWD, const struct timespec *_RESTRICT_KYWD,
149 	const sigset_t *_RESTRICT_KYWD);
150 #endif
151 
152 #endif	/* _KERNEL */
153 
154 #ifdef	__cplusplus
155 }
156 #endif
157 
158 #endif	/* _SYS_SELECT_H */
159