xref: /freebsd/sys/sys/event.h (revision 81b22a98)
1 /*-
2  * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
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 
31 #ifndef _SYS_EVENT_H_
32 #define _SYS_EVENT_H_
33 
34 #include <sys/_types.h>
35 #include <sys/queue.h>
36 
37 #define EVFILT_READ		(-1)
38 #define EVFILT_WRITE		(-2)
39 #define EVFILT_AIO		(-3)	/* attached to aio requests */
40 #define EVFILT_VNODE		(-4)	/* attached to vnodes */
41 #define EVFILT_PROC		(-5)	/* attached to struct proc */
42 #define EVFILT_SIGNAL		(-6)	/* attached to struct proc */
43 #define EVFILT_TIMER		(-7)	/* timers */
44 #define EVFILT_PROCDESC		(-8)	/* attached to process descriptors */
45 #define EVFILT_FS		(-9)	/* filesystem events */
46 #define EVFILT_LIO		(-10)	/* attached to lio requests */
47 #define EVFILT_USER		(-11)	/* User events */
48 #define EVFILT_SENDFILE		(-12)	/* attached to sendfile requests */
49 #define EVFILT_EMPTY		(-13)	/* empty send socket buf */
50 #define EVFILT_SYSCOUNT		13
51 
52 #if defined(__STDC_VERSION__) && __STDC_VERSION__ >= 199901L
53 #define	EV_SET(kevp_, a, b, c, d, e, f) do {	\
54 	*(kevp_) = (struct kevent){		\
55 	    .ident = (a),			\
56 	    .filter = (b),			\
57 	    .flags = (c),			\
58 	    .fflags = (d),			\
59 	    .data = (e),			\
60 	    .udata = (f),			\
61 	    .ext = {0},				\
62 	};					\
63 } while (0)
64 #else /* Pre-C99 or not STDC (e.g., C++) */
65 /*
66  * The definition of the local variable kevp could possibly conflict
67  * with a user-defined value passed in parameters a-f.
68  */
69 #define EV_SET(kevp_, a, b, c, d, e, f) do {	\
70 	struct kevent *kevp = (kevp_);		\
71 	(kevp)->ident = (a);			\
72 	(kevp)->filter = (b);			\
73 	(kevp)->flags = (c);			\
74 	(kevp)->fflags = (d);			\
75 	(kevp)->data = (e);			\
76 	(kevp)->udata = (f);			\
77 	(kevp)->ext[0] = 0;			\
78 	(kevp)->ext[1] = 0;			\
79 	(kevp)->ext[2] = 0;			\
80 	(kevp)->ext[3] = 0;			\
81 } while (0)
82 #endif
83 
84 struct kevent {
85 	__uintptr_t	ident;		/* identifier for this event */
86 	short		filter;		/* filter for event */
87 	unsigned short	flags;		/* action flags for kqueue */
88 	unsigned int	fflags;		/* filter flag value */
89 	__int64_t	data;		/* filter data value */
90 	void		*udata;		/* opaque user data identifier */
91 	__uint64_t	ext[4];		/* extensions */
92 };
93 
94 #if defined(_WANT_FREEBSD11_KEVENT)
95 /* Older structure used in FreeBSD 11.x and older. */
96 struct kevent_freebsd11 {
97 	__uintptr_t	ident;		/* identifier for this event */
98 	short		filter;		/* filter for event */
99 	unsigned short	flags;
100 	unsigned int	fflags;
101 	__intptr_t	data;
102 	void		*udata;		/* opaque user data identifier */
103 };
104 #endif
105 
106 #if defined(_WANT_KEVENT32) || (defined(_KERNEL) && defined(__LP64__))
107 struct kevent32 {
108 	uint32_t	ident;		/* identifier for this event */
109 	short		filter;		/* filter for event */
110 	u_short		flags;
111 	u_int		fflags;
112 #ifndef __amd64__
113 	uint32_t	pad0;
114 #endif
115 	uint32_t	data1, data2;
116 	uint32_t	udata;		/* opaque user data identifier */
117 #ifndef __amd64__
118 	uint32_t	pad1;
119 #endif
120 	uint32_t	ext64[8];
121 };
122 
123 #ifdef _WANT_FREEBSD11_KEVENT
124 struct kevent32_freebsd11 {
125 	u_int32_t	ident;		/* identifier for this event */
126 	short		filter;		/* filter for event */
127 	u_short		flags;
128 	u_int		fflags;
129 	int32_t		data;
130 	u_int32_t	udata;		/* opaque user data identifier */
131 };
132 #endif
133 #endif
134 
135 /* actions */
136 #define EV_ADD		0x0001		/* add event to kq (implies enable) */
137 #define EV_DELETE	0x0002		/* delete event from kq */
138 #define EV_ENABLE	0x0004		/* enable event */
139 #define EV_DISABLE	0x0008		/* disable event (not reported) */
140 #define EV_FORCEONESHOT	0x0100		/* enable _ONESHOT and force trigger */
141 #define EV_KEEPUDATA	0x0200		/* do not update the udata field */
142 
143 /* flags */
144 #define EV_ONESHOT	0x0010		/* only report one occurrence */
145 #define EV_CLEAR	0x0020		/* clear event state after reporting */
146 #define EV_RECEIPT	0x0040		/* force EV_ERROR on success, data=0 */
147 #define EV_DISPATCH	0x0080		/* disable event after reporting */
148 
149 #define EV_SYSFLAGS	0xF000		/* reserved by system */
150 #define	EV_DROP		0x1000		/* note should be dropped */
151 #define EV_FLAG1	0x2000		/* filter-specific flag */
152 #define EV_FLAG2	0x4000		/* filter-specific flag */
153 
154 /* returned values */
155 #define EV_EOF		0x8000		/* EOF detected */
156 #define EV_ERROR	0x4000		/* error, data contains errno */
157 
158  /*
159   * data/hint flags/masks for EVFILT_USER, shared with userspace
160   *
161   * On input, the top two bits of fflags specifies how the lower twenty four
162   * bits should be applied to the stored value of fflags.
163   *
164   * On output, the top two bits will always be set to NOTE_FFNOP and the
165   * remaining twenty four bits will contain the stored fflags value.
166   */
167 #define NOTE_FFNOP	0x00000000		/* ignore input fflags */
168 #define NOTE_FFAND	0x40000000		/* AND fflags */
169 #define NOTE_FFOR	0x80000000		/* OR fflags */
170 #define NOTE_FFCOPY	0xc0000000		/* copy fflags */
171 #define NOTE_FFCTRLMASK	0xc0000000		/* masks for operations */
172 #define NOTE_FFLAGSMASK	0x00ffffff
173 
174 #define NOTE_TRIGGER	0x01000000		/* Cause the event to be
175 						   triggered for output. */
176 
177 /*
178  * data/hint flags for EVFILT_{READ|WRITE}, shared with userspace
179  */
180 #define NOTE_LOWAT	0x0001			/* low water mark */
181 #define NOTE_FILE_POLL	0x0002			/* behave like poll() */
182 
183 /*
184  * data/hint flags for EVFILT_VNODE, shared with userspace
185  */
186 #define	NOTE_DELETE	0x0001			/* vnode was removed */
187 #define	NOTE_WRITE	0x0002			/* data contents changed */
188 #define	NOTE_EXTEND	0x0004			/* size increased */
189 #define	NOTE_ATTRIB	0x0008			/* attributes changed */
190 #define	NOTE_LINK	0x0010			/* link count changed */
191 #define	NOTE_RENAME	0x0020			/* vnode was renamed */
192 #define	NOTE_REVOKE	0x0040			/* vnode access was revoked */
193 #define	NOTE_OPEN	0x0080			/* vnode was opened */
194 #define	NOTE_CLOSE	0x0100			/* file closed, fd did not
195 						   allowed write */
196 #define	NOTE_CLOSE_WRITE 0x0200			/* file closed, fd did allowed
197 						   write */
198 #define	NOTE_READ	0x0400			/* file was read */
199 
200 /*
201  * data/hint flags for EVFILT_PROC and EVFILT_PROCDESC, shared with userspace
202  */
203 #define	NOTE_EXIT	0x80000000		/* process exited */
204 #define	NOTE_FORK	0x40000000		/* process forked */
205 #define	NOTE_EXEC	0x20000000		/* process exec'd */
206 #define	NOTE_PCTRLMASK	0xf0000000		/* mask for hint bits */
207 #define	NOTE_PDATAMASK	0x000fffff		/* mask for pid */
208 
209 /* additional flags for EVFILT_PROC */
210 #define	NOTE_TRACK	0x00000001		/* follow across forks */
211 #define	NOTE_TRACKERR	0x00000002		/* could not track child */
212 #define	NOTE_CHILD	0x00000004		/* am a child process */
213 
214 /* additional flags for EVFILT_TIMER */
215 #define NOTE_SECONDS		0x00000001	/* data is seconds */
216 #define NOTE_MSECONDS		0x00000002	/* data is milliseconds */
217 #define NOTE_USECONDS		0x00000004	/* data is microseconds */
218 #define NOTE_NSECONDS		0x00000008	/* data is nanoseconds */
219 #define	NOTE_ABSTIME		0x00000010	/* timeout is absolute */
220 
221 struct knote;
222 SLIST_HEAD(klist, knote);
223 struct kqueue;
224 TAILQ_HEAD(kqlist, kqueue);
225 struct knlist {
226 	struct	klist	kl_list;
227 	void    (*kl_lock)(void *);	/* lock function */
228 	void    (*kl_unlock)(void *);
229 	void	(*kl_assert_lock)(void *, int);
230 	void	*kl_lockarg;		/* argument passed to lock functions */
231 	int	kl_autodestroy;
232 };
233 
234 #ifdef _KERNEL
235 
236 /*
237  * Flags for knote call
238  */
239 #define	KNF_LISTLOCKED	0x0001			/* knlist is locked */
240 #define	KNF_NOKQLOCK	0x0002			/* do not keep KQ_LOCK */
241 
242 #define KNOTE(list, hint, flags)	knote(list, hint, flags)
243 #define KNOTE_LOCKED(list, hint)	knote(list, hint, KNF_LISTLOCKED)
244 #define KNOTE_UNLOCKED(list, hint)	knote(list, hint, 0)
245 
246 #define	KNLIST_EMPTY(list)		SLIST_EMPTY(&(list)->kl_list)
247 
248 /*
249  * Flag indicating hint is a signal.  Used by EVFILT_SIGNAL, and also
250  * shared by EVFILT_PROC  (all knotes attached to p->p_klist)
251  */
252 #define NOTE_SIGNAL	0x08000000
253 
254 /*
255  * Hint values for the optional f_touch event filter.  If f_touch is not set
256  * to NULL and f_isfd is zero the f_touch filter will be called with the type
257  * argument set to EVENT_REGISTER during a kevent() system call.  It is also
258  * called under the same conditions with the type argument set to EVENT_PROCESS
259  * when the event has been triggered.
260  */
261 #define EVENT_REGISTER	1
262 #define EVENT_PROCESS	2
263 
264 struct filterops {
265 	int	f_isfd;		/* true if ident == filedescriptor */
266 	int	(*f_attach)(struct knote *kn);
267 	void	(*f_detach)(struct knote *kn);
268 	int	(*f_event)(struct knote *kn, long hint);
269 	void	(*f_touch)(struct knote *kn, struct kevent *kev, u_long type);
270 };
271 
272 /*
273  * An in-flux knote cannot be dropped from its kq while the kq is
274  * unlocked.  If the KN_SCAN flag is not set, a thread can only set
275  * kn_influx when it is exclusive owner of the knote state, and can
276  * modify kn_status as if it had the KQ lock.  KN_SCAN must not be set
277  * on a knote which is already in flux.
278  *
279  * kn_sfflags, kn_sdata, and kn_kevent are protected by the knlist lock.
280  */
281 struct knote {
282 	SLIST_ENTRY(knote)	kn_link;	/* for kq */
283 	SLIST_ENTRY(knote)	kn_selnext;	/* for struct selinfo */
284 	struct			knlist *kn_knlist;	/* f_attach populated */
285 	TAILQ_ENTRY(knote)	kn_tqe;
286 	struct			kqueue *kn_kq;	/* which queue we are on */
287 	struct 			kevent kn_kevent;
288 	void			*kn_hook;
289 	int			kn_hookid;
290 	int			kn_status;	/* protected by kq lock */
291 #define KN_ACTIVE	0x01			/* event has been triggered */
292 #define KN_QUEUED	0x02			/* event is on queue */
293 #define KN_DISABLED	0x04			/* event is disabled */
294 #define KN_DETACHED	0x08			/* knote is detached */
295 #define KN_MARKER	0x20			/* ignore this knote */
296 #define KN_KQUEUE	0x40			/* this knote belongs to a kq */
297 #define	KN_SCAN		0x100			/* flux set in kqueue_scan() */
298 	int			kn_influx;
299 	int			kn_sfflags;	/* saved filter flags */
300 	int64_t			kn_sdata;	/* saved data field */
301 	union {
302 		struct		file *p_fp;	/* file data pointer */
303 		struct		proc *p_proc;	/* proc pointer */
304 		struct		kaiocb *p_aio;	/* AIO job pointer */
305 		struct		aioliojob *p_lio;	/* LIO job pointer */
306 		void		*p_v;		/* generic other pointer */
307 	} kn_ptr;
308 	struct			filterops *kn_fop;
309 
310 #define kn_id		kn_kevent.ident
311 #define kn_filter	kn_kevent.filter
312 #define kn_flags	kn_kevent.flags
313 #define kn_fflags	kn_kevent.fflags
314 #define kn_data		kn_kevent.data
315 #define kn_fp		kn_ptr.p_fp
316 };
317 struct kevent_copyops {
318 	void	*arg;
319 	int	(*k_copyout)(void *arg, struct kevent *kevp, int count);
320 	int	(*k_copyin)(void *arg, struct kevent *kevp, int count);
321 	size_t	kevent_size;
322 };
323 
324 struct thread;
325 struct proc;
326 struct knlist;
327 struct mtx;
328 struct rwlock;
329 
330 void	knote(struct knlist *list, long hint, int lockflags);
331 void	knote_fork(struct knlist *list, int pid);
332 struct knlist *knlist_alloc(struct mtx *lock);
333 void	knlist_detach(struct knlist *knl);
334 void	knlist_add(struct knlist *knl, struct knote *kn, int islocked);
335 void	knlist_remove(struct knlist *knl, struct knote *kn, int islocked);
336 int	knlist_empty(struct knlist *knl);
337 void	knlist_init(struct knlist *knl, void *lock, void (*kl_lock)(void *),
338 	    void (*kl_unlock)(void *), void (*kl_assert_lock)(void *, int));
339 void	knlist_init_mtx(struct knlist *knl, struct mtx *lock);
340 void	knlist_init_rw_reader(struct knlist *knl, struct rwlock *lock);
341 void	knlist_destroy(struct knlist *knl);
342 void	knlist_cleardel(struct knlist *knl, struct thread *td,
343 	    int islocked, int killkn);
344 #define knlist_clear(knl, islocked)				\
345 	knlist_cleardel((knl), NULL, (islocked), 0)
346 #define knlist_delete(knl, td, islocked)			\
347 	knlist_cleardel((knl), (td), (islocked), 1)
348 void	knote_fdclose(struct thread *p, int fd);
349 int 	kqfd_register(int fd, struct kevent *kev, struct thread *p,
350 	    int mflag);
351 int	kqueue_add_filteropts(int filt, struct filterops *filtops);
352 int	kqueue_del_filteropts(int filt);
353 void	kqueue_drain_schedtask(void);
354 
355 #else 	/* !_KERNEL */
356 
357 #include <sys/cdefs.h>
358 struct timespec;
359 
360 __BEGIN_DECLS
361 int     kqueue(void);
362 int     kevent(int kq, const struct kevent *changelist, int nchanges,
363 	    struct kevent *eventlist, int nevents,
364 	    const struct timespec *timeout);
365 __END_DECLS
366 
367 #endif /* !_KERNEL */
368 
369 #endif /* !_SYS_EVENT_H_ */
370