RTEMS 6.1-rc4
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event.h
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: head/sys/sys/event.h 336457 2018-07-18 13:04:03Z dab $
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/* The definition of the local variable kevp could possibly conflict
66 * with a user-defined value passed in parameters a-f.
67 */
68#define EV_SET(kevp_, a, b, c, d, e, f) do { \
69 struct kevent *kevp = (kevp_); \
70 (kevp)->ident = (a); \
71 (kevp)->filter = (b); \
72 (kevp)->flags = (c); \
73 (kevp)->fflags = (d); \
74 (kevp)->data = (e); \
75 (kevp)->udata = (f); \
76 (kevp)->ext[0] = 0; \
77 (kevp)->ext[1] = 0; \
78 (kevp)->ext[2] = 0; \
79 (kevp)->ext[3] = 0; \
80} while(0)
81#endif
82
83struct kevent {
84 __uintptr_t ident; /* identifier for this event */
85 short filter; /* filter for event */
86 unsigned short flags; /* action flags for kqueue */
87 unsigned int fflags; /* filter flag value */
88 __int64_t data; /* filter data value */
89 void *udata; /* opaque user data identifier */
90 __uint64_t ext[4]; /* extensions */
91};
92
93#if defined(_WANT_FREEBSD11_KEVENT)
94/* Older structure used in FreeBSD 11.x and older. */
95struct kevent_freebsd11 {
96 __uintptr_t ident; /* identifier for this event */
97 short filter; /* filter for event */
98 unsigned short flags;
99 unsigned int fflags;
100 __intptr_t data;
101 void *udata; /* opaque user data identifier */
102};
103#endif
104
105#if defined(_WANT_KEVENT32) || (defined(_KERNEL) && defined(__LP64__))
106struct kevent32 {
107 uint32_t ident; /* identifier for this event */
108 short filter; /* filter for event */
109 u_short flags;
110 u_int fflags;
111#ifndef __amd64__
112 uint32_t pad0;
113#endif
114 int32_t data1, data2;
115 uint32_t udata; /* opaque user data identifier */
116#ifndef __amd64__
117 uint32_t pad1;
118#endif
119 uint32_t ext64[8];
120};
121
122#ifdef _WANT_FREEBSD11_KEVENT
123struct kevent32_freebsd11 {
124 u_int32_t ident; /* identifier for this event */
125 short filter; /* filter for event */
126 u_short flags;
127 u_int fflags;
128 int32_t data;
129 u_int32_t udata; /* opaque user data identifier */
130};
131#endif
132#endif
133
134/* actions */
135#define EV_ADD 0x0001 /* add event to kq (implies enable) */
136#define EV_DELETE 0x0002 /* delete event from kq */
137#define EV_ENABLE 0x0004 /* enable event */
138#define EV_DISABLE 0x0008 /* disable event (not reported) */
139#define EV_FORCEONESHOT 0x0100 /* enable _ONESHOT and force trigger */
140
141/* flags */
142#define EV_ONESHOT 0x0010 /* only report one occurrence */
143#define EV_CLEAR 0x0020 /* clear event state after reporting */
144#define EV_RECEIPT 0x0040 /* force EV_ERROR on success, data=0 */
145#define EV_DISPATCH 0x0080 /* disable event after reporting */
146
147#define EV_SYSFLAGS 0xF000 /* reserved by system */
148#define EV_DROP 0x1000 /* note should be dropped */
149#define EV_FLAG1 0x2000 /* filter-specific flag */
150#define EV_FLAG2 0x4000 /* filter-specific flag */
151
152/* returned values */
153#define EV_EOF 0x8000 /* EOF detected */
154#define EV_ERROR 0x4000 /* error, data contains errno */
155
156 /*
157 * data/hint flags/masks for EVFILT_USER, shared with userspace
158 *
159 * On input, the top two bits of fflags specifies how the lower twenty four
160 * bits should be applied to the stored value of fflags.
161 *
162 * On output, the top two bits will always be set to NOTE_FFNOP and the
163 * remaining twenty four bits will contain the stored fflags value.
164 */
165#define NOTE_FFNOP 0x00000000 /* ignore input fflags */
166#define NOTE_FFAND 0x40000000 /* AND fflags */
167#define NOTE_FFOR 0x80000000 /* OR fflags */
168#define NOTE_FFCOPY 0xc0000000 /* copy fflags */
169#define NOTE_FFCTRLMASK 0xc0000000 /* masks for operations */
170#define NOTE_FFLAGSMASK 0x00ffffff
171
172#define NOTE_TRIGGER 0x01000000 /* Cause the event to be
173 triggered for output. */
174
175/*
176 * data/hint flags for EVFILT_{READ|WRITE}, shared with userspace
177 */
178#define NOTE_LOWAT 0x0001 /* low water mark */
179#define NOTE_FILE_POLL 0x0002 /* behave like poll() */
180
181/*
182 * data/hint flags for EVFILT_VNODE, shared with userspace
183 */
184#define NOTE_DELETE 0x0001 /* vnode was removed */
185#define NOTE_WRITE 0x0002 /* data contents changed */
186#define NOTE_EXTEND 0x0004 /* size increased */
187#define NOTE_ATTRIB 0x0008 /* attributes changed */
188#define NOTE_LINK 0x0010 /* link count changed */
189#define NOTE_RENAME 0x0020 /* vnode was renamed */
190#define NOTE_REVOKE 0x0040 /* vnode access was revoked */
191#define NOTE_OPEN 0x0080 /* vnode was opened */
192#define NOTE_CLOSE 0x0100 /* file closed, fd did not
193 allowed write */
194#define NOTE_CLOSE_WRITE 0x0200 /* file closed, fd did allowed
195 write */
196#define NOTE_READ 0x0400 /* file was read */
197
198/*
199 * data/hint flags for EVFILT_PROC and EVFILT_PROCDESC, shared with userspace
200 */
201#define NOTE_EXIT 0x80000000 /* process exited */
202#define NOTE_FORK 0x40000000 /* process forked */
203#define NOTE_EXEC 0x20000000 /* process exec'd */
204#define NOTE_PCTRLMASK 0xf0000000 /* mask for hint bits */
205#define NOTE_PDATAMASK 0x000fffff /* mask for pid */
206
207/* additional flags for EVFILT_PROC */
208#define NOTE_TRACK 0x00000001 /* follow across forks */
209#define NOTE_TRACKERR 0x00000002 /* could not track child */
210#define NOTE_CHILD 0x00000004 /* am a child process */
211
212/* additional flags for EVFILT_TIMER */
213#define NOTE_SECONDS 0x00000001 /* data is seconds */
214#define NOTE_MSECONDS 0x00000002 /* data is milliseconds */
215#define NOTE_USECONDS 0x00000004 /* data is microseconds */
216#define NOTE_NSECONDS 0x00000008 /* data is nanoseconds */
217#define NOTE_ABSTIME 0x00000010 /* timeout is absolute */
218
219struct knote;
220SLIST_HEAD(klist, knote);
221struct kqueue;
222TAILQ_HEAD(kqlist, kqueue);
223struct knlist {
224 struct klist kl_list;
225 void (*kl_lock)(void *); /* lock function */
226 void (*kl_unlock)(void *);
227 void (*kl_assert_locked)(void *);
228 void (*kl_assert_unlocked)(void *);
229 void *kl_lockarg; /* argument passed to lock functions */
230 int kl_autodestroy;
231};
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
264struct 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 */
281struct 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_HASKQLOCK 0x80 /* for _inevent */
298#define KN_SCAN 0x100 /* flux set in kqueue_scan() */
299 int kn_influx;
300 int kn_sfflags; /* saved filter flags */
301 int64_t kn_sdata; /* saved data field */
302 union {
303 struct file *p_fp; /* file data pointer */
304 struct proc *p_proc; /* proc pointer */
305 struct kaiocb *p_aio; /* AIO job pointer */
306 struct aioliojob *p_lio; /* LIO job pointer */
307 void *p_v; /* generic other pointer */
308 } kn_ptr;
309 struct filterops *kn_fop;
310
311#define kn_id kn_kevent.ident
312#define kn_filter kn_kevent.filter
313#define kn_flags kn_kevent.flags
314#define kn_fflags kn_kevent.fflags
315#define kn_data kn_kevent.data
316#define kn_fp kn_ptr.p_fp
317};
318struct kevent_copyops {
319 void *arg;
320 int (*k_copyout)(void *arg, struct kevent *kevp, int count);
321 int (*k_copyin)(void *arg, struct kevent *kevp, int count);
322 size_t kevent_size;
323};
324
325struct thread;
326struct proc;
327struct knlist;
328struct mtx;
329struct rwlock;
330
331void knote(struct knlist *list, long hint, int lockflags);
332void knote_fork(struct knlist *list, int pid);
333struct knlist *knlist_alloc(struct mtx *lock);
334void knlist_detach(struct knlist *knl);
335void knlist_add(struct knlist *knl, struct knote *kn, int islocked);
336void knlist_remove(struct knlist *knl, struct knote *kn, int islocked);
337int knlist_empty(struct knlist *knl);
338void knlist_init(struct knlist *knl, void *lock, void (*kl_lock)(void *),
339 void (*kl_unlock)(void *), void (*kl_assert_locked)(void *),
340 void (*kl_assert_unlocked)(void *));
341void knlist_init_mtx(struct knlist *knl, struct mtx *lock);
342void knlist_init_rw_reader(struct knlist *knl, struct rwlock *lock);
343void knlist_destroy(struct knlist *knl);
344void knlist_cleardel(struct knlist *knl, struct thread *td,
345 int islocked, int killkn);
346#define knlist_clear(knl, islocked) \
347 knlist_cleardel((knl), NULL, (islocked), 0)
348#define knlist_delete(knl, td, islocked) \
349 knlist_cleardel((knl), (td), (islocked), 1)
350void knote_fdclose(struct thread *p, int fd);
351int kqfd_register(int fd, struct kevent *kev, struct thread *p,
352 int waitok);
353int kqueue_add_filteropts(int filt, struct filterops *filtops);
354int kqueue_del_filteropts(int filt);
355
356#else /* !_KERNEL */
357
358#include <sys/cdefs.h>
359struct timespec;
360
361__BEGIN_DECLS
362int kqueue(void);
363int kevent(int kq, const struct kevent *changelist, int nchanges,
364 struct kevent *eventlist, int nevents,
365 const struct timespec *timeout);
366__END_DECLS
367
368#endif /* !_KERNEL */
369
370#endif /* !_SYS_EVENT_H_ */
file
Definition: mongoose.c:448
kevent
Definition: event.h:83
knlist
Definition: event.h:220
p
unsigned p
Definition: tte.h:17
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