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event.h
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1 /*-
2  * Copyright (c) 1999,2000,2001 Jonathan Lemon <jlemon@FreeBSD.org>
3  * 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  *
14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17  * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24  * SUCH DAMAGE.
25  *
26  * $FreeBSD: src/sys/sys/event.h,v 1.22 2003/02/02 19:39:51 nectar Exp $
27  */
28 
29 #ifndef _TIRPC_EVENT_H_
30 #define _TIRPC_EVENT_H_
31 
32 #define EVFILT_READ (-1)
33 #define EVFILT_WRITE (-2)
34 #define EVFILT_AIO (-3) /* attached to aio requests */
35 #define EVFILT_VNODE (-4) /* attached to vnodes */
36 #define EVFILT_PROC (-5) /* attached to struct proc */
37 #define EVFILT_SIGNAL (-6) /* attached to struct proc */
38 #define EVFILT_TIMER (-7) /* timers */
39 #define EVFILT_NETDEV (-8) /* network devices */
40 
41 #define EVFILT_SYSCOUNT 8
42 
43 #define EV_SET(kevp_, a, b, c, d, e, f) do { \
44  struct kevent *kevp = (kevp_); \
45  (kevp)->ident = (a); \
46  (kevp)->filter = (b); \
47  (kevp)->flags = (c); \
48  (kevp)->fflags = (d); \
49  (kevp)->data = (e); \
50  (kevp)->udata = (f); \
51 } while(0)
52 
53 #include <stdint.h>
54 
55 struct kevent {
56  uintptr_t ident; /* identifier for this event */
57  short filter; /* filter for event */
61  void *udata; /* opaque user data identifier */
62 };
63 
64 /* actions */
65 #define EV_ADD 0x0001 /* add event to kq (implies enable) */
66 #define EV_DELETE 0x0002 /* delete event from kq */
67 #define EV_ENABLE 0x0004 /* enable event */
68 #define EV_DISABLE 0x0008 /* disable event (not reported) */
69 
70 /* flags */
71 #define EV_ONESHOT 0x0010 /* only report one occurrence */
72 #define EV_CLEAR 0x0020 /* clear event state after reporting */
73 
74 #define EV_SYSFLAGS 0xF000 /* reserved by system */
75 #define EV_FLAG1 0x2000 /* filter-specific flag */
76 
77 /* returned values */
78 #define EV_EOF 0x8000 /* EOF detected */
79 #define EV_ERROR 0x4000 /* error, data contains errno */
80 
81 /*
82  * data/hint flags for EVFILT_{READ|WRITE}, shared with userspace
83  */
84 #define NOTE_LOWAT 0x0001 /* low water mark */
85 
86 /*
87  * data/hint flags for EVFILT_VNODE, shared with userspace
88  */
89 #define NOTE_DELETE 0x0001 /* vnode was removed */
90 #define NOTE_WRITE 0x0002 /* data contents changed */
91 #define NOTE_EXTEND 0x0004 /* size increased */
92 #define NOTE_ATTRIB 0x0008 /* attributes changed */
93 #define NOTE_LINK 0x0010 /* link count changed */
94 #define NOTE_RENAME 0x0020 /* vnode was renamed */
95 #define NOTE_REVOKE 0x0040 /* vnode access was revoked */
96 
97 /*
98  * data/hint flags for EVFILT_PROC, shared with userspace
99  */
100 #define NOTE_EXIT 0x80000000 /* process exited */
101 #define NOTE_FORK 0x40000000 /* process forked */
102 #define NOTE_EXEC 0x20000000 /* process exec'd */
103 #define NOTE_PCTRLMASK 0xf0000000 /* mask for hint bits */
104 #define NOTE_PDATAMASK 0x000fffff /* mask for pid */
105 
106 /* additional flags for EVFILT_PROC */
107 #define NOTE_TRACK 0x00000001 /* follow across forks */
108 #define NOTE_TRACKERR 0x00000002 /* could not track child */
109 #define NOTE_CHILD 0x00000004 /* am a child process */
110 
111 /*
112  * data/hint flags for EVFILT_NETDEV, shared with userspace
113  */
114 #define NOTE_LINKUP 0x0001 /* link is up */
115 #define NOTE_LINKDOWN 0x0002 /* link is down */
116 #define NOTE_LINKINV 0x0004 /* link state is invalid */
117 
118 /*
119  * This is currently visible to userland to work around broken
120  * programs which pull in <sys/proc.h>.
121  */
122 #include <sys/queue.h>
123 
124 struct knote;
125 SLIST_HEAD(klist, knote);
126 
127 #ifdef _KERNEL
128 
129 #ifdef MALLOC_DECLARE
130 MALLOC_DECLARE(M_KQUEUE);
131 #endif
132 
133 #define KNOTE(list, hint) if ((list) != NULL) knote(list, hint)
134 
135 /*
136  * Flag indicating hint is a signal. Used by EVFILT_SIGNAL, and also
137  * shared by EVFILT_PROC (all knotes attached to p->p_klist)
138  */
139 #define NOTE_SIGNAL 0x08000000
140 
141 struct filterops {
142  int f_isfd; /* true if ident == filedescriptor */
143  int (*f_attach)(struct knote *kn);
144  void (*f_detach)(struct knote *kn);
145  int (*f_event)(struct knote *kn, long hint);
146 };
147 
148 struct knote {
149  SLIST_ENTRY(knote) kn_link; /* for fd */
150  SLIST_ENTRY(knote) kn_selnext; /* for struct selinfo */
151  TAILQ_ENTRY(knote) kn_tqe;
152  struct kqueue *kn_kq; /* which queue we are on */
153  struct kevent kn_kevent;
154  int kn_status;
155  int kn_sfflags; /* saved filter flags */
156  intptr_t kn_sdata; /* saved data field */
157  union {
158  struct file *p_fp; /* file data pointer */
159  struct proc *p_proc; /* proc pointer */
160  } kn_ptr;
161  struct filterops *kn_fop;
162  void *kn_hook;
163 #define KN_ACTIVE 0x01 /* event has been triggered */
164 #define KN_QUEUED 0x02 /* event is on queue */
165 #define KN_DISABLED 0x04 /* event is disabled */
166 #define KN_DETACHED 0x08 /* knote is detached */
167 
168 #define kn_id kn_kevent.ident
169 #define kn_filter kn_kevent.filter
170 #define kn_flags kn_kevent.flags
171 #define kn_fflags kn_kevent.fflags
172 #define kn_data kn_kevent.data
173 #define kn_fp kn_ptr.p_fp
174 };
175 
176 struct thread;
177 struct proc;
178 
179 extern void knote(struct klist *list, long hint);
180 extern void knote_remove(struct thread *p, struct klist *list);
181 extern void knote_fdclose(struct thread *p, int fd);
182 extern int kqueue_register(struct kqueue *kq,
183  struct kevent *kev, struct thread *p);
184 extern int kqueue_add_filteropts(int filt, struct filterops *filtops);
185 extern int kqueue_del_filteropts(int filt);
186 
187 #else /* !_KERNEL */
188 
189 //#include <sys/cdefs.h>
190 struct timespec;
191 
193 int kqueue(void);
194 int kevent(int kq, const struct kevent *changelist, int nchanges,
195  struct kevent *eventlist, int nevents,
196  const struct timespec *timeout);
198 
199 #endif /* !_KERNEL */
200 
201 #endif /* !_TIRPC_EVENT_H_ */
int kevent(int kq, const struct kevent *changelist, int nchanges, struct kevent *eventlist, int nevents, const struct timespec *timeout)
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