Annotation of sys/sys/event.h, Revision 1.1.1.1
1.1 nbrk 1: /* $OpenBSD: event.h,v 1.11 2007/05/30 00:23:48 tedu Exp $ */
2:
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: src/sys/sys/event.h,v 1.11 2001/02/24 01:41:31 jlemon Exp $
29: */
30:
31: #ifndef _SYS_EVENT_H_
32: #define _SYS_EVENT_H_
33:
34: #define EVFILT_READ (-1)
35: #define EVFILT_WRITE (-2)
36: #define EVFILT_AIO (-3) /* attached to aio requests */
37: #define EVFILT_VNODE (-4) /* attached to vnodes */
38: #define EVFILT_PROC (-5) /* attached to struct proc */
39: #define EVFILT_SIGNAL (-6) /* attached to struct proc */
40: #define EVFILT_TIMER (-7) /* timers */
41:
42: #define EVFILT_SYSCOUNT 7
43:
44: #define EV_SET(kevp, a, b, c, d, e, f) do { \
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: struct kevent {
54: u_int ident; /* identifier for this event */
55: short filter; /* filter for event */
56: u_short flags;
57: u_int fflags;
58: int data;
59: void *udata; /* opaque user data identifier */
60: };
61:
62: /* actions */
63: #define EV_ADD 0x0001 /* add event to kq (implies enable) */
64: #define EV_DELETE 0x0002 /* delete event from kq */
65: #define EV_ENABLE 0x0004 /* enable event */
66: #define EV_DISABLE 0x0008 /* disable event (not reported) */
67:
68: /* flags */
69: #define EV_ONESHOT 0x0010 /* only report one occurrence */
70: #define EV_CLEAR 0x0020 /* clear event state after reporting */
71:
72: #define EV_SYSFLAGS 0xF000 /* reserved by system */
73: #define EV_FLAG1 0x2000 /* filter-specific flag */
74:
75: /* returned values */
76: #define EV_EOF 0x8000 /* EOF detected */
77: #define EV_ERROR 0x4000 /* error, data contains errno */
78:
79: /*
80: * data/hint flags for EVFILT_{READ|WRITE}, shared with userspace
81: */
82: #define NOTE_LOWAT 0x0001 /* low water mark */
83: #define NOTE_EOF 0x0002 /* return on EOF */
84:
85: /*
86: * data/hint flags for EVFILT_VNODE, shared with userspace
87: */
88: #define NOTE_DELETE 0x0001 /* vnode was removed */
89: #define NOTE_WRITE 0x0002 /* data contents changed */
90: #define NOTE_EXTEND 0x0004 /* size increased */
91: #define NOTE_ATTRIB 0x0008 /* attributes changed */
92: #define NOTE_LINK 0x0010 /* link count changed */
93: #define NOTE_RENAME 0x0020 /* vnode was renamed */
94: #define NOTE_REVOKE 0x0040 /* vnode access was revoked */
95: #define NOTE_TRUNCATE 0x0080 /* vnode was truncated */
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: * This is currently visible to userland to work around broken
113: * programs which pull in <sys/proc.h> or <sys/selinfo.h>.
114: */
115: #include <sys/queue.h>
116: struct knote;
117: SLIST_HEAD(klist, knote);
118:
119: #ifdef _KERNEL
120:
121: #define KNOTE(list, hint) if ((list) != NULL) knote(list, hint)
122:
123: /*
124: * Flag indicating hint is a signal. Used by EVFILT_SIGNAL, and also
125: * shared by EVFILT_PROC (all knotes attached to p->p_klist)
126: */
127: #define NOTE_SIGNAL 0x08000000
128:
129: struct filterops {
130: int f_isfd; /* true if ident == filedescriptor */
131: int (*f_attach)(struct knote *kn);
132: void (*f_detach)(struct knote *kn);
133: int (*f_event)(struct knote *kn, long hint);
134: };
135:
136: struct knote {
137: SLIST_ENTRY(knote) kn_link; /* for fd */
138: SLIST_ENTRY(knote) kn_selnext; /* for struct selinfo */
139: TAILQ_ENTRY(knote) kn_tqe;
140: struct kqueue *kn_kq; /* which queue we are on */
141: struct kevent kn_kevent;
142: int kn_status;
143: int kn_sfflags; /* saved filter flags */
144: int kn_sdata; /* saved data field */
145: union {
146: struct file *p_fp; /* file data pointer */
147: struct proc *p_proc; /* proc pointer */
148: } kn_ptr;
149: const struct filterops *kn_fop;
150: void *kn_hook;
151: #define KN_ACTIVE 0x01 /* event has been triggered */
152: #define KN_QUEUED 0x02 /* event is on queue */
153: #define KN_DISABLED 0x04 /* event is disabled */
154: #define KN_DETACHED 0x08 /* knote is detached */
155:
156: #define kn_id kn_kevent.ident
157: #define kn_filter kn_kevent.filter
158: #define kn_flags kn_kevent.flags
159: #define kn_fflags kn_kevent.fflags
160: #define kn_data kn_kevent.data
161: #define kn_fp kn_ptr.p_fp
162: };
163:
164: struct proc;
165:
166: extern void knote(struct klist *list, long hint);
167: extern void knote_remove(struct proc *p, struct klist *list);
168: extern void knote_fdclose(struct proc *p, int fd);
169: extern int kqueue_register(struct kqueue *kq,
170: struct kevent *kev, struct proc *p);
171: extern int filt_seltrue(struct knote *kn, long hint);
172: extern void klist_invalidate(struct klist *);
173:
174: #else /* !_KERNEL */
175:
176: #include <sys/cdefs.h>
177: struct timespec;
178:
179: __BEGIN_DECLS
180: int kqueue(void);
181: int kevent(int kq, const struct kevent *changelist, int nchanges,
182: struct kevent *eventlist, int nevents,
183: const struct timespec *timeout);
184: __END_DECLS
185:
186: #endif /* !_KERNEL */
187:
188: #endif /* !_SYS_EVENT_H_ */
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