1 /* $NetBSD: event.h,v 1.24 2015/01/14 22:21:00 christos 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 1.12 2001/02/24 01:44:03 jlemon Exp $ 29 */ 30 31 #ifndef _SYS_EVENT_H_ 32 #define _SYS_EVENT_H_ 33 34 #include <sys/featuretest.h> 35 #include <sys/types.h> /* for size_t */ 36 #include <sys/inttypes.h> /* for uintptr_t */ 37 #include <sys/null.h> /* for NULL */ 38 39 #define EVFILT_READ 0U 40 #define EVFILT_WRITE 1U 41 #define EVFILT_AIO 2U /* attached to aio requests */ 42 #define EVFILT_VNODE 3U /* attached to vnodes */ 43 #define EVFILT_PROC 4U /* attached to struct proc */ 44 #define EVFILT_SIGNAL 5U /* attached to struct proc */ 45 #define EVFILT_TIMER 6U /* arbitrary timer (in ms) */ 46 #define EVFILT_SYSCOUNT 7U /* number of filters */ 47 48 #define EV_SET(kevp, a, b, c, d, e, f) \ 49 do { \ 50 (kevp)->ident = (a); \ 51 (kevp)->filter = (b); \ 52 (kevp)->flags = (c); \ 53 (kevp)->fflags = (d); \ 54 (kevp)->data = (e); \ 55 (kevp)->udata = (f); \ 56 } while (/* CONSTCOND */ 0) 57 58 59 struct kevent { 60 uintptr_t ident; /* identifier for this event */ 61 uint32_t filter; /* filter for event */ 62 uint32_t flags; /* action flags for kqueue */ 63 uint32_t fflags; /* filter flag value */ 64 int64_t data; /* filter data value */ 65 intptr_t udata; /* opaque user data identifier */ 66 }; 67 68 /* actions */ 69 #define EV_ADD 0x0001U /* add event to kq (implies ENABLE) */ 70 #define EV_DELETE 0x0002U /* delete event from kq */ 71 #define EV_ENABLE 0x0004U /* enable event */ 72 #define EV_DISABLE 0x0008U /* disable event (not reported) */ 73 74 /* flags */ 75 #define EV_ONESHOT 0x0010U /* only report one occurrence */ 76 #define EV_CLEAR 0x0020U /* clear event state after reporting */ 77 78 #define EV_SYSFLAGS 0xF000U /* reserved by system */ 79 #define EV_FLAG1 0x2000U /* filter-specific flag */ 80 81 /* returned values */ 82 #define EV_EOF 0x8000U /* EOF detected */ 83 #define EV_ERROR 0x4000U /* error, data contains errno */ 84 85 /* 86 * hint flag for in-kernel use - must not equal any existing note 87 */ 88 #ifdef _KERNEL 89 #define NOTE_SUBMIT 0x01000000U /* initial knote submission */ 90 #endif 91 /* 92 * data/hint flags for EVFILT_{READ|WRITE}, shared with userspace 93 */ 94 #define NOTE_LOWAT 0x0001U /* low water mark */ 95 96 /* 97 * data/hint flags for EVFILT_VNODE, shared with userspace 98 */ 99 #define NOTE_DELETE 0x0001U /* vnode was removed */ 100 #define NOTE_WRITE 0x0002U /* data contents changed */ 101 #define NOTE_EXTEND 0x0004U /* size increased */ 102 #define NOTE_ATTRIB 0x0008U /* attributes changed */ 103 #define NOTE_LINK 0x0010U /* link count changed */ 104 #define NOTE_RENAME 0x0020U /* vnode was renamed */ 105 #define NOTE_REVOKE 0x0040U /* vnode access was revoked */ 106 107 /* 108 * data/hint flags for EVFILT_PROC, shared with userspace 109 */ 110 #define NOTE_EXIT 0x80000000U /* process exited */ 111 #define NOTE_FORK 0x40000000U /* process forked */ 112 #define NOTE_EXEC 0x20000000U /* process exec'd */ 113 #define NOTE_PCTRLMASK 0xf0000000U /* mask for hint bits */ 114 #define NOTE_PDATAMASK 0x000fffffU /* mask for pid */ 115 116 /* additional flags for EVFILT_PROC */ 117 #define NOTE_TRACK 0x00000001U /* follow across forks */ 118 #define NOTE_TRACKERR 0x00000002U /* could not track child */ 119 #define NOTE_CHILD 0x00000004U /* am a child process */ 120 121 /* 122 * This is currently visible to userland to work around broken 123 * programs which pull in <sys/proc.h> or <sys/select.h>. 124 */ 125 #include <sys/queue.h> 126 struct knote; 127 SLIST_HEAD(klist, knote); 128 129 130 /* 131 * ioctl(2)s supported on kqueue descriptors. 132 */ 133 #include <sys/ioctl.h> 134 135 struct kfilter_mapping { 136 char *name; /* name to lookup or return */ 137 size_t len; /* length of name */ 138 uint32_t filter; /* filter to lookup or return */ 139 }; 140 141 /* map filter to name (max size len) */ 142 #define KFILTER_BYFILTER _IOWR('k', 0, struct kfilter_mapping) 143 /* map name to filter (len ignored) */ 144 #define KFILTER_BYNAME _IOWR('k', 1, struct kfilter_mapping) 145 146 #ifdef _KERNEL 147 148 #define KNOTE(list, hint) if (!SLIST_EMPTY(list)) knote(list, hint) 149 150 /* 151 * Flag indicating hint is a signal. Used by EVFILT_SIGNAL, and also 152 * shared by EVFILT_PROC (all knotes attached to p->p_klist) 153 */ 154 #define NOTE_SIGNAL 0x08000000U 155 156 /* 157 * Callback methods for each filter type. 158 */ 159 struct filterops { 160 int f_isfd; /* true if ident == filedescriptor */ 161 int (*f_attach) (struct knote *); 162 /* called when knote is ADDed */ 163 void (*f_detach) (struct knote *); 164 /* called when knote is DELETEd */ 165 int (*f_event) (struct knote *, long); 166 /* called when event is triggered */ 167 }; 168 169 /* 170 * Field locking: 171 * 172 * f kn_kq->kq_fdp->fd_lock 173 * q kn_kq->kq_lock 174 * o object mutex (e.g. device driver or vnode interlock) 175 */ 176 struct kfilter; 177 178 struct knote { 179 SLIST_ENTRY(knote) kn_link; /* f: for fd */ 180 SLIST_ENTRY(knote) kn_selnext; /* o: for struct selinfo */ 181 TAILQ_ENTRY(knote) kn_tqe; /* q: for struct kqueue */ 182 struct kqueue *kn_kq; /* q: which queue we are on */ 183 struct kevent kn_kevent; 184 uint32_t kn_status; 185 uint32_t kn_sfflags; /* saved filter flags */ 186 uintptr_t kn_sdata; /* saved data field */ 187 void *kn_obj; /* pointer to monitored obj */ 188 const struct filterops *kn_fop; 189 struct kfilter *kn_kfilter; 190 void *kn_hook; 191 192 #define KN_ACTIVE 0x01U /* event has been triggered */ 193 #define KN_QUEUED 0x02U /* event is on queue */ 194 #define KN_DISABLED 0x04U /* event is disabled */ 195 #define KN_DETACHED 0x08U /* knote is detached */ 196 #define KN_MARKER 0x10U /* is a marker */ 197 198 #define kn_id kn_kevent.ident 199 #define kn_filter kn_kevent.filter 200 #define kn_flags kn_kevent.flags 201 #define kn_fflags kn_kevent.fflags 202 #define kn_data kn_kevent.data 203 }; 204 205 #include <sys/systm.h> /* for copyin_t */ 206 207 struct lwp; 208 struct timespec; 209 210 void kqueue_init(void); 211 void knote(struct klist *, long); 212 void knote_fdclose(int); 213 214 typedef int (*kevent_fetch_changes_t)(void *, const struct kevent *, 215 struct kevent *, size_t, int); 216 typedef int (*kevent_put_events_t)(void *, struct kevent *, struct kevent *, 217 size_t, int); 218 219 struct kevent_ops { 220 void *keo_private; 221 copyin_t keo_fetch_timeout; 222 kevent_fetch_changes_t keo_fetch_changes; 223 kevent_put_events_t keo_put_events; 224 }; 225 226 227 int kevent_fetch_changes(void *, const struct kevent *, struct kevent *, 228 size_t, int); 229 int kevent_put_events(void *, struct kevent *, struct kevent *, size_t, 230 int); 231 int kevent1(register_t *, int, const struct kevent *, 232 size_t, struct kevent *, size_t, const struct timespec *, 233 const struct kevent_ops *); 234 235 int kfilter_register(const char *, const struct filterops *, int *); 236 int kfilter_unregister(const char *); 237 238 int filt_seltrue(struct knote *, long); 239 extern const struct filterops seltrue_filtops; 240 241 #else /* !_KERNEL */ 242 243 #include <sys/cdefs.h> 244 struct timespec; 245 246 __BEGIN_DECLS 247 #if defined(_NETBSD_SOURCE) 248 int kqueue(void); 249 int kqueue1(int); 250 #ifndef __LIBC12_SOURCE__ 251 int kevent(int, const struct kevent *, size_t, struct kevent *, size_t, 252 const struct timespec *) __RENAME(__kevent50); 253 #endif 254 #endif /* !_POSIX_C_SOURCE */ 255 __END_DECLS 256 257 #endif /* !_KERNEL */ 258 259 #endif /* !_SYS_EVENT_H_ */ 260