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 1.5.2.6 2003/02/09 15:28:13 nectar Exp $ 27 */ 28 29 #ifndef _SYS_EVENT_H_ 30 #define _SYS_EVENT_H_ 31 32 #ifndef _SYS_TYPES_H_ 33 #include <sys/types.h> 34 #endif 35 #if defined(_KERNEL) || defined(_KERNEL_STRUCTURES) 36 #include <sys/queue.h> 37 #endif 38 39 #define EVFILT_READ (-1) 40 #define EVFILT_WRITE (-2) 41 #define EVFILT_AIO (-3) /* attached to aio requests */ 42 #define EVFILT_VNODE (-4) /* attached to vnodes */ 43 #define EVFILT_PROC (-5) /* attached to struct proc */ 44 #define EVFILT_SIGNAL (-6) /* attached to struct proc */ 45 #define EVFILT_TIMER (-7) /* timers */ 46 #define EVFILT_EXCEPT (-8) /* exceptional conditions */ 47 #define EVFILT_USER (-9) /* user events */ 48 #define EVFILT_FS (-10) /* filesystem events */ 49 50 #define EVFILT_MARKER 0xF /* placemarker for tailq */ 51 52 #define EVFILT_SYSCOUNT 10 53 54 #define EV_SET(kevp_, a, b, c, d, e, f) do { \ 55 struct kevent *kevp = (kevp_); \ 56 (kevp)->ident = (a); \ 57 (kevp)->filter = (b); \ 58 (kevp)->flags = (c); \ 59 (kevp)->fflags = (d); \ 60 (kevp)->data = (e); \ 61 (kevp)->udata = (f); \ 62 } while(0) 63 64 struct kevent { 65 uintptr_t ident; /* identifier for this event */ 66 short filter; /* filter for event */ 67 u_short flags; 68 u_int fflags; 69 intptr_t data; 70 void *udata; /* opaque user data identifier */ 71 }; 72 73 /* actions */ 74 #define EV_ADD 0x0001 /* add event to kq (implies enable) */ 75 #define EV_DELETE 0x0002 /* delete event from kq */ 76 #define EV_ENABLE 0x0004 /* enable event */ 77 #define EV_DISABLE 0x0008 /* disable event (not reported) */ 78 79 /* flags */ 80 #define EV_ONESHOT 0x0010 /* only report one occurrence */ 81 #define EV_CLEAR 0x0020 /* clear event state after reporting */ 82 #define EV_RECEIPT 0x0040 /* force EV_ERROR on success, data=0 */ 83 #define EV_DISPATCH 0x0080 /* disable event after reporting */ 84 85 #define EV_SYSFLAGS 0xF800 /* reserved by system */ 86 #define EV_FLAG1 0x2000 /* filter-specific flag */ 87 88 /* returned values */ 89 #define EV_HUP 0x0800 /* complete peer disconnect */ 90 #define EV_EOF 0x8000 /* EOF detected */ 91 #define EV_ERROR 0x4000 /* error, data contains errno */ 92 #define EV_NODATA 0x1000 /* EOF and no more data */ 93 94 /* 95 * EVFILT_USER 96 */ 97 /* 98 * data/hint flags/masks for EVFILT_USER, shared with userspace 99 * 100 * On input, the top two bits of fflags specifies how the lower twenty four 101 * bits should be applied to the stored value of fflags. 102 * 103 * On output, the top two bits will always be set to NOTE_FFNOP and the 104 * remaining twenty four bits will contain the stored fflags value. 105 */ 106 #define NOTE_FFNOP 0x00000000 /* ignore input fflags */ 107 #define NOTE_FFAND 0x40000000 /* AND fflags */ 108 #define NOTE_FFOR 0x80000000 /* OR fflags */ 109 #define NOTE_FFCOPY 0xc0000000 /* copy fflags */ 110 #define NOTE_FFCTRLMASK 0xc0000000 /* masks for operations */ 111 #define NOTE_FFLAGSMASK 0x00ffffff 112 113 #define NOTE_TRIGGER 0x01000000 /* trigger for output */ 114 115 /* 116 * data/hint flags for EVFILT_{READ|WRITE}, shared with userspace 117 */ 118 #define NOTE_LOWAT 0x0001 /* low water mark */ 119 120 /* 121 * data/hint flags for EVFILT_EXCEPT, shared with userspace and with 122 * EVFILT_{READ|WRITE} 123 */ 124 #define NOTE_OOB 0x0002 /* OOB data on a socket */ 125 126 /* 127 * data/hint flags for EVFILT_VNODE, shared with userspace 128 */ 129 #define NOTE_DELETE 0x0001 /* vnode was removed */ 130 #define NOTE_WRITE 0x0002 /* data contents changed */ 131 #define NOTE_EXTEND 0x0004 /* size increased */ 132 #define NOTE_ATTRIB 0x0008 /* attributes changed */ 133 #define NOTE_LINK 0x0010 /* link count changed */ 134 #define NOTE_RENAME 0x0020 /* vnode was renamed */ 135 #define NOTE_REVOKE 0x0040 /* vnode access was revoked */ 136 137 /* 138 * data/hint flags for EVFILT_PROC, shared with userspace 139 */ 140 #define NOTE_EXIT 0x80000000 /* process exited */ 141 #define NOTE_FORK 0x40000000 /* process forked */ 142 #define NOTE_EXEC 0x20000000 /* process exec'd */ 143 #define NOTE_PCTRLMASK 0xf0000000 /* mask for hint bits */ 144 #define NOTE_PDATAMASK 0x000fffff /* mask for pid */ 145 146 /* additional flags for EVFILT_PROC */ 147 #define NOTE_TRACK 0x00000001 /* follow across forks */ 148 #define NOTE_TRACKERR 0x00000002 /* could not track child */ 149 #define NOTE_CHILD 0x00000004 /* am a child process */ 150 151 #if defined(_KERNEL) || defined(_KERNEL_STRUCTURES) 152 153 struct knote; 154 SLIST_HEAD(klist, knote); 155 156 /* 157 * Used to maintain information about processes that wish to be 158 * notified when I/O becomes possible. 159 */ 160 struct kqinfo { 161 struct klist ki_note; /* kernel note list */ 162 }; 163 164 #endif 165 166 #ifdef _KERNEL 167 168 #define KNOTE(list, hint) if (!SLIST_EMPTY((list))) knote(list, hint) 169 170 /* 171 * Flag indicating hint is a signal. Used by EVFILT_SIGNAL, and also 172 * shared by EVFILT_PROC (all knotes attached to p->p_klist) 173 * 174 * NOTE_OLDAPI - Indicate that standard filters are being called from the 175 * select/poll wrapper. 176 * 177 * NOTE_HUPONLY - Indicate that an EVFILT_READ should not trigger on 178 * read data present, only on a HUP/EOF. Used by kernel 179 * poll() handler. 180 */ 181 #define NOTE_SIGNAL 0x08000000 182 #define NOTE_OLDAPI 0x04000000 /* select/poll note */ 183 #define NOTE_HUPONLY 0x02000000 /* select/poll note */ 184 185 #define FILTEROP_ISFD 0x0001 /* if ident == filedescriptor */ 186 #define FILTEROP_MPSAFE 0x0002 187 188 struct filterops { 189 u_short f_flags; 190 191 /* f_attach returns 0 on success or valid error code on failure */ 192 int (*f_attach) (struct knote *kn); 193 void (*f_detach) (struct knote *kn); 194 195 /* f_event returns boolean truth */ 196 int (*f_event) (struct knote *kn, long hint); 197 }; 198 199 struct knote { 200 SLIST_ENTRY(knote) kn_link; /* for fd */ 201 TAILQ_ENTRY(knote) kn_kqlink; /* for kq_knlist */ 202 SLIST_ENTRY(knote) kn_next; /* for struct kqinfo */ 203 TAILQ_ENTRY(knote) kn_tqe; /* for kq_knpend */ 204 struct kqueue *kn_kq; /* which queue we are on */ 205 struct kevent kn_kevent; 206 int kn_status; 207 int kn_sfflags; /* saved filter flags */ 208 intptr_t kn_sdata; /* saved data field */ 209 union { 210 struct file *p_fp; /* file data pointer */ 211 struct proc *p_proc; /* proc pointer */ 212 int hookid; 213 } kn_ptr; 214 struct filterops *kn_fop; 215 caddr_t kn_hook; 216 }; 217 218 #define KN_ACTIVE 0x0001 /* event has been triggered */ 219 #define KN_QUEUED 0x0002 /* event is on queue */ 220 #define KN_DISABLED 0x0004 /* event is disabled */ 221 #define KN_DETACHED 0x0008 /* knote is detached */ 222 #define KN_REPROCESS 0x0010 /* force reprocessing race */ 223 #define KN_DELETING 0x0020 /* deletion in progress */ 224 #define KN_PROCESSING 0x0040 /* event processing in prog */ 225 #define KN_WAITING 0x0080 /* waiting on processing */ 226 227 #define kn_id kn_kevent.ident 228 #define kn_filter kn_kevent.filter 229 #define kn_flags kn_kevent.flags 230 #define kn_fflags kn_kevent.fflags 231 #define kn_data kn_kevent.data 232 #define kn_fp kn_ptr.p_fp 233 234 struct proc; 235 struct thread; 236 struct filedesc; 237 struct kevent_args; 238 239 #define KEVENT_TIMEOUT_PRECISE 0x01 240 #define KEVENT_AUTO_STALE 0x02 /* used by poll/select */ 241 242 #define KEVENT_SCAN_MASK 0xF0 243 #define KEVENT_SCAN_KEEP_MARKER 0x10 244 #define KEVENT_SCAN_RELOAD_MARKER 0x20 245 #define KEVENT_SCAN_INSERT_MARKER 0x40 246 247 typedef int (*k_copyout_fn)(void *arg, struct kevent *kevp, int count, 248 int *res); 249 typedef int (*k_copyin_fn)(void *arg, struct kevent *kevp, int max, 250 int *events); 251 int kern_kevent(struct kqueue *kq, int nevents, int *res, void *uap, 252 k_copyin_fn kevent_copyin, k_copyout_fn kevent_copyout, 253 struct timespec *tsp, int flags); 254 255 void knote(struct klist *, long); 256 void knote_insert(struct klist *, struct knote *); 257 void knote_remove(struct klist *, struct knote *); 258 void knote_assume_knotes(struct kqinfo *, struct kqinfo *, 259 struct filterops *, void *); 260 void knote_fdclose(struct file *, struct filedesc *, int); 261 void kqueue_init(struct kqueue *, struct filedesc *); 262 void kqueue_terminate(struct kqueue *); 263 int kqueue_register(struct kqueue *, struct kevent *, int *); 264 265 extern struct klist fs_klist; /* EVFILT_FS */ 266 267 #endif /* _KERNEL */ 268 269 #if !defined(_KERNEL) || defined(_KERNEL_VIRTUAL) 270 271 #include <sys/cdefs.h> 272 struct timespec; 273 274 __BEGIN_DECLS 275 int kqueue (void); 276 int kevent (int, const struct kevent *, int, struct kevent *, 277 int, const struct timespec *); 278 __END_DECLS 279 #endif /* !_KERNEL */ 280 281 #endif /* !_SYS_EVENT_H_ */ 282