xref: /illumos-gate/usr/src/boot/sys/sys/select.h (revision 199767f8)
1*199767f8SToomas Soome /*-
2*199767f8SToomas Soome  * Copyright (c) 1992, 1993
3*199767f8SToomas Soome  *	The Regents of the University of California.  All rights reserved.
4*199767f8SToomas Soome  *
5*199767f8SToomas Soome  * Redistribution and use in source and binary forms, with or without
6*199767f8SToomas Soome  * modification, are permitted provided that the following conditions
7*199767f8SToomas Soome  * are met:
8*199767f8SToomas Soome  * 1. Redistributions of source code must retain the above copyright
9*199767f8SToomas Soome  *    notice, this list of conditions and the following disclaimer.
10*199767f8SToomas Soome  * 2. Redistributions in binary form must reproduce the above copyright
11*199767f8SToomas Soome  *    notice, this list of conditions and the following disclaimer in the
12*199767f8SToomas Soome  *    documentation and/or other materials provided with the distribution.
13*199767f8SToomas Soome  * 4. Neither the name of the University nor the names of its contributors
14*199767f8SToomas Soome  *    may be used to endorse or promote products derived from this software
15*199767f8SToomas Soome  *    without specific prior written permission.
16*199767f8SToomas Soome  *
17*199767f8SToomas Soome  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
18*199767f8SToomas Soome  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19*199767f8SToomas Soome  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20*199767f8SToomas Soome  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
21*199767f8SToomas Soome  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22*199767f8SToomas Soome  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23*199767f8SToomas Soome  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24*199767f8SToomas Soome  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25*199767f8SToomas Soome  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26*199767f8SToomas Soome  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27*199767f8SToomas Soome  * SUCH DAMAGE.
28*199767f8SToomas Soome  *
29*199767f8SToomas Soome  * $FreeBSD$
30*199767f8SToomas Soome  */
31*199767f8SToomas Soome 
32*199767f8SToomas Soome #ifndef _SYS_SELECT_H_
33*199767f8SToomas Soome #define	_SYS_SELECT_H_
34*199767f8SToomas Soome 
35*199767f8SToomas Soome #include <sys/cdefs.h>
36*199767f8SToomas Soome #include <sys/_types.h>
37*199767f8SToomas Soome 
38*199767f8SToomas Soome #include <sys/_sigset.h>
39*199767f8SToomas Soome #include <sys/_timeval.h>
40*199767f8SToomas Soome #include <sys/timespec.h>
41*199767f8SToomas Soome 
42*199767f8SToomas Soome typedef	unsigned long	__fd_mask;
43*199767f8SToomas Soome #if __BSD_VISIBLE
44*199767f8SToomas Soome typedef	__fd_mask	fd_mask;
45*199767f8SToomas Soome #endif
46*199767f8SToomas Soome 
47*199767f8SToomas Soome #ifndef _SIGSET_T_DECLARED
48*199767f8SToomas Soome #define	_SIGSET_T_DECLARED
49*199767f8SToomas Soome typedef	__sigset_t	sigset_t;
50*199767f8SToomas Soome #endif
51*199767f8SToomas Soome 
52*199767f8SToomas Soome /*
53*199767f8SToomas Soome  * Select uses bit masks of file descriptors in longs.  These macros
54*199767f8SToomas Soome  * manipulate such bit fields (the filesystem macros use chars).
55*199767f8SToomas Soome  * FD_SETSIZE may be defined by the user, but the default here should
56*199767f8SToomas Soome  * be enough for most uses.
57*199767f8SToomas Soome  */
58*199767f8SToomas Soome #ifndef	FD_SETSIZE
59*199767f8SToomas Soome #define	FD_SETSIZE	1024
60*199767f8SToomas Soome #endif
61*199767f8SToomas Soome 
62*199767f8SToomas Soome #define	_NFDBITS	(sizeof(__fd_mask) * 8)	/* bits per mask */
63*199767f8SToomas Soome #if __BSD_VISIBLE
64*199767f8SToomas Soome #define	NFDBITS		_NFDBITS
65*199767f8SToomas Soome #endif
66*199767f8SToomas Soome 
67*199767f8SToomas Soome #ifndef _howmany
68*199767f8SToomas Soome #define	_howmany(x, y)	(((x) + ((y) - 1)) / (y))
69*199767f8SToomas Soome #endif
70*199767f8SToomas Soome 
71*199767f8SToomas Soome typedef	struct fd_set {
72*199767f8SToomas Soome 	__fd_mask	__fds_bits[_howmany(FD_SETSIZE, _NFDBITS)];
73*199767f8SToomas Soome } fd_set;
74*199767f8SToomas Soome #if __BSD_VISIBLE
75*199767f8SToomas Soome #define	fds_bits	__fds_bits
76*199767f8SToomas Soome #endif
77*199767f8SToomas Soome 
78*199767f8SToomas Soome #define	__fdset_mask(n)	((__fd_mask)1 << ((n) % _NFDBITS))
79*199767f8SToomas Soome #define	FD_CLR(n, p)	((p)->__fds_bits[(n)/_NFDBITS] &= ~__fdset_mask(n))
80*199767f8SToomas Soome #if __BSD_VISIBLE
81*199767f8SToomas Soome #define	FD_COPY(f, t)	(void)(*(t) = *(f))
82*199767f8SToomas Soome #endif
83*199767f8SToomas Soome #define	FD_ISSET(n, p)	(((p)->__fds_bits[(n)/_NFDBITS] & __fdset_mask(n)) != 0)
84*199767f8SToomas Soome #define	FD_SET(n, p)	((p)->__fds_bits[(n)/_NFDBITS] |= __fdset_mask(n))
85*199767f8SToomas Soome #define	FD_ZERO(p) do {					\
86*199767f8SToomas Soome 	fd_set *_p;					\
87*199767f8SToomas Soome 	__size_t _n;					\
88*199767f8SToomas Soome 							\
89*199767f8SToomas Soome 	_p = (p);					\
90*199767f8SToomas Soome 	_n = _howmany(FD_SETSIZE, _NFDBITS);		\
91*199767f8SToomas Soome 	while (_n > 0)					\
92*199767f8SToomas Soome 		_p->__fds_bits[--_n] = 0;		\
93*199767f8SToomas Soome } while (0)
94*199767f8SToomas Soome 
95*199767f8SToomas Soome #ifndef _KERNEL
96*199767f8SToomas Soome 
97*199767f8SToomas Soome __BEGIN_DECLS
98*199767f8SToomas Soome int pselect(int, fd_set *__restrict, fd_set *__restrict, fd_set *__restrict,
99*199767f8SToomas Soome 	const struct timespec *__restrict, const sigset_t *__restrict);
100*199767f8SToomas Soome #ifndef _SELECT_DECLARED
101*199767f8SToomas Soome #define	_SELECT_DECLARED
102*199767f8SToomas Soome /* XXX missing restrict type-qualifier */
103*199767f8SToomas Soome int	select(int, fd_set *, fd_set *, fd_set *, struct timeval *);
104*199767f8SToomas Soome #endif
105*199767f8SToomas Soome __END_DECLS
106*199767f8SToomas Soome #endif /* !_KERNEL */
107*199767f8SToomas Soome 
108*199767f8SToomas Soome #endif /* _SYS_SELECT_H_ */
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