FreeBSD/Linux Kernel Cross Reference
sys/sys/selinfo.h
1 /*-
2 * Copyright (c) 1992, 1993
3 * The Regents of the University of California. All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 3. All advertising materials mentioning features or use of this software
14 * must display the following acknowledgement:
15 * This product includes software developed by the University of
16 * California, Berkeley and its contributors.
17 * 4. Neither the name of the University nor the names of its contributors
18 * may be used to endorse or promote products derived from this software
19 * without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
32 *
33 * @(#)select.h 8.2 (Berkeley) 1/4/94
34 * $FreeBSD: releng/5.1/sys/sys/selinfo.h 92719 2002-03-19 20:18:42Z alfred $
35 */
36
37 #ifndef _SYS_SELINFO_H_
38 #define _SYS_SELINFO_H_
39
40 #include <sys/event.h> /* for struct klist */
41
42 /*
43 * Used to maintain information about processes that wish to be
44 * notified when I/O becomes possible.
45 */
46 struct selinfo {
47 TAILQ_ENTRY(selinfo) si_thrlist; /* list hung off of thread */
48 struct thread *si_thread; /* thread waiting */
49 struct klist si_note; /* kernel note list */
50 short si_flags; /* see below */
51 };
52 #define SI_COLL 0x0001 /* collision occurred */
53
54 #define SEL_WAITING(si) \
55 ((si)->si_thread != NULL || ((si)->si_flags & SI_COLL) != 0)
56
57 #ifdef _KERNEL
58 void clear_selinfo_list(struct thread *td);
59 void selrecord(struct thread *selector, struct selinfo *sip);
60 void selwakeup(struct selinfo *sip);
61 #endif
62
63 #endif /* !_SYS_SELINFO_H_ */
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