1/*-
2 * SPDX-License-Identifier: BSD-2-Clause
3 *
4 * Copyright (c) 1999,2000,2001 Jonathan Lemon <jlemon@FreeBSD.org>
5 * 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 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 *
28 * $FreeBSD$
29 */
30#ifndef _BSD_SYS_EVENT_H_
31#define _BSD_SYS_EVENT_H_
32
33#include <features.h>
34
35#ifdef _DEFAULT_SOURCE
36
37#include <stdint.h>
38
39
40#define EVFILT_READ			(-1)
41#define EVFILT_WRITE		(-2)
42#define EVFILT_PROC			(-5)
43
44#if defined(__STDC_VERSION__) && __STDC_VERSION__ >= 199901L
45#define	EV_SET(kevp_, a, b, c, d, e, f) do {	\
46	*(kevp_) = (struct kevent){		\
47		.ident = (a),			\
48		.filter = (b),			\
49		.flags = (c),			\
50		.fflags = (d),			\
51		.data = (e),			\
52		.udata = (f),			\
53		.ext = {0},				\
54	};					\
55} while (0)
56#else /* Pre-C99 or not STDC (e.g., C++) */
57/*
58 * The definition of the local variable kevp could possibly conflict
59 * with a user-defined value passed in parameters a-f.
60 */
61#define EV_SET(kevp_, a, b, c, d, e, f) do {	\
62	struct kevent *kevp = (kevp_);		\
63	(kevp)->ident = (a);			\
64	(kevp)->filter = (b);			\
65	(kevp)->flags = (c);			\
66	(kevp)->fflags = (d);			\
67	(kevp)->data = (e);			\
68	(kevp)->udata = (f);			\
69	(kevp)->ext[0] = 0;			\
70	(kevp)->ext[1] = 0;			\
71	(kevp)->ext[2] = 0;			\
72	(kevp)->ext[3] = 0;			\
73} while (0)
74#endif
75
76struct kevent {
77	uintptr_t	ident;		/* identifier for this event */
78	short		filter;		/* filter for event */
79	unsigned short	flags;		/* action flags for kqueue */
80	unsigned int	fflags;		/* filter flag value */
81	int64_t	data;		/* filter data value */
82	void		*udata;		/* opaque user data identifier */
83	uint64_t	ext[4];		/* extensions */
84};
85
86/* actions */
87#define EV_ADD		0x0001		/* add event to kq (implies enable) */
88#define EV_DELETE	0x0002		/* delete event from kq */
89
90/* flags */
91#define EV_ONESHOT	0x0010		/* only report one occurrence */
92#define EV_CLEAR	0x0020		/* clear event state after reporting */
93
94/* returned values */
95#define EV_EOF		0x8000		/* EOF detected */
96#define EV_ERROR	0x4000		/* error, data contains errno */
97
98/* data/hint flags for EVFILT_PROC */
99#define	NOTE_EXIT	0x80000000		/* process exited */
100
101
102#ifdef __cplusplus
103extern "C" {
104#endif
105
106int     kqueue(void);
107int     kevent(int kq, const struct kevent *changelist, int nchanges,
108			struct kevent *eventlist, int nevents,
109			const struct timespec *timeout);
110
111#ifdef __cplusplus
112}
113#endif
114
115
116#endif	/* _DEFAULT_SOURCE */
117
118#endif	/* _BSD_SYS_EVENT_H_ */
119