xref: /titanic_51/usr/src/uts/common/sys/select.h (revision dcf050af29bc1c6bd38ba7f173dc18bb7c5629e1)
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 2010 Sun Microsystems, Inc.  All rights reserved.
26  * Use is subject to license terms.
27  */
28 
29 /*	Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T	*/
30 /*	  All Rights Reserved	*/
31 
32 /*
33  * University Copyright- Copyright (c) 1982, 1986, 1988
34  * The Regents of the University of California
35  * All Rights Reserved
36  *
37  * University Acknowledgment- Portions of this document are derived from
38  * software developed by the University of California, Berkeley, and its
39  * contributors.
40  */
41 
42 #ifndef _SYS_SELECT_H
43 #define	_SYS_SELECT_H
44 
45 #include <sys/feature_tests.h>
46 
47 #ifndef _KERNEL
48 #if !defined(__XOPEN_OR_POSIX) || defined(_XPG6) || defined(__EXTENSIONS__)
49 #include <sys/time_impl.h>
50 #endif
51 #include <sys/time.h>
52 #endif /* _KERNEL */
53 
54 #ifdef	__cplusplus
55 extern "C" {
56 #endif
57 
58 
59 #if !defined(__XOPEN_OR_POSIX) || defined(_XPG6) || defined(__EXTENSIONS__)
60 /*
61  * The sigset_t type is defined in <sys/signal.h> and duplicated
62  * in <sys/ucontext.h> as a result of XPG4v2 requirements. XPG6
63  * now allows the visibility of signal.h in this header, however
64  * an order of inclusion problem occurs as a result of inclusion
65  * of <sys/select.h> in <signal.h> under certain conditions.
66  * Rather than include <sys/signal.h> here, we've duplicated
67  * the sigset_t type instead. This type is required for the XPG6
68  * introduced pselect() function also declared in this header.
69  */
70 #ifndef	_SIGSET_T
71 #define	_SIGSET_T
72 typedef struct {		/* signal set type */
73 	unsigned int	__sigbits[4];
74 } sigset_t;
75 #endif  /* _SIGSET_T */
76 
77 #endif /* #if !defined(__XOPEN_OR_POSIX) || defined(_XPG6) ... */
78 
79 /*
80  * Select uses bit masks of file descriptors in longs.
81  * These macros manipulate such bit fields.
82  * FD_SETSIZE may be defined by the user, but the default here
83  * should be >= NOFILE (param.h).
84  */
85 #ifndef	FD_SETSIZE
86 #ifdef _LP64
87 #define	FD_SETSIZE	65536
88 #else
89 #define	FD_SETSIZE	1024
90 #endif	/* _LP64 */
91 #elif FD_SETSIZE > 1024 && !defined(_LP64)
92 #ifdef __PRAGMA_REDEFINE_EXTNAME
93 #pragma	redefine_extname	select	select_large_fdset
94 #if !defined(__XOPEN_OR_POSIX) || defined(_XPG6) || defined(__EXTENSIONS__)
95 #pragma	redefine_extname	pselect	pselect_large_fdset
96 #endif
97 #else	/* __PRAGMA_REDEFINE_EXTNAME */
98 #define	select	select_large_fdset
99 #if !defined(__XOPEN_OR_POSIX) || defined(_XPG6) || defined(__EXTENSIONS__)
100 #define	pselect	pselect_large_fdset
101 #endif
102 #endif	/* __PRAGMA_REDEFINE_EXTNAME */
103 #endif	/* FD_SETSIZE */
104 
105 #if !defined(_XPG4_2) || defined(__EXTENSIONS__)
106 typedef	long	fd_mask;
107 #endif
108 typedef	long	fds_mask;
109 
110 /*
111  *  The value of _NBBY needs to be consistant with the value
112  *  of NBBY in <sys/param.h>.
113  */
114 #define	_NBBY 8
115 #if !defined(_XPG4_2) || defined(__EXTENSIONS__)
116 #ifndef NBBY		/* number of bits per byte */
117 #define	NBBY _NBBY
118 #endif
119 #endif /* !defined(_XPG4_2) || defined(__EXTENSIONS__) */
120 
121 #if !defined(_XPG4_2) || defined(__EXTENSIONS__)
122 #define	NFDBITS		(sizeof (fd_mask) * NBBY)	/* bits per mask */
123 #endif
124 #define	FD_NFDBITS	(sizeof (fds_mask) * _NBBY)	/* bits per mask */
125 
126 #define	__howmany(__x, __y)	(((__x)+((__y)-1))/(__y))
127 #if !defined(_XPG4_2) || defined(__EXTENSIONS__)
128 #ifndef	howmany
129 #define	howmany(x, y)	(((x)+((y)-1))/(y))
130 #endif
131 #endif /* !defined(_XPG4_2) || defined(__EXTENSIONS__) */
132 
133 #if !defined(_XPG4_2) || defined(__EXTENSIONS__)
134 typedef	struct fd_set {
135 #else
136 typedef	struct __fd_set {
137 #endif
138 	long	fds_bits[__howmany(FD_SETSIZE, FD_NFDBITS)];
139 } fd_set;
140 
141 #define	FD_SET(__n, __p)	((__p)->fds_bits[(__n)/FD_NFDBITS] |= \
142 				    (1ul << ((__n) % FD_NFDBITS)))
143 
144 #define	FD_CLR(__n, __p)	((__p)->fds_bits[(__n)/FD_NFDBITS] &= \
145 				    ~(1ul << ((__n) % FD_NFDBITS)))
146 
147 #define	FD_ISSET(__n, __p)	(((__p)->fds_bits[(__n)/FD_NFDBITS] & \
148 				    (1ul << ((__n) % FD_NFDBITS))) != 0l)
149 
150 #ifdef _KERNEL
151 #define	FD_ZERO(p)	bzero((p), sizeof (*(p)))
152 #else
153 #define	FD_ZERO(__p)    (void) memset((__p), 0, sizeof (*(__p)))
154 #endif /* _KERNEL */
155 
156 #ifndef	_KERNEL
157 extern int select(int, fd_set *_RESTRICT_KYWD, fd_set *_RESTRICT_KYWD,
158 	fd_set *_RESTRICT_KYWD, struct timeval *_RESTRICT_KYWD);
159 
160 #if !defined(__XOPEN_OR_POSIX) || defined(_XPG6) || defined(__EXTENSIONS__)
161 extern int pselect(int, fd_set *_RESTRICT_KYWD, fd_set *_RESTRICT_KYWD,
162 	fd_set *_RESTRICT_KYWD, const struct timespec *_RESTRICT_KYWD,
163 	const sigset_t *_RESTRICT_KYWD);
164 #endif
165 
166 #endif	/* _KERNEL */
167 
168 #ifdef	__cplusplus
169 }
170 #endif
171 
172 #endif	/* _SYS_SELECT_H */
173