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 * $DragonFly: src/sys/sys/event.h,v 1.7 2007/01/15 01:26:56 dillon Exp $ 28 */ 29 30 #ifndef _SYS_EVENT_H_ 31 #define _SYS_EVENT_H_ 32 33 #ifndef _SYS_TYPES_H_ 34 #include <sys/types.h> 35 #endif 36 #ifndef _NET_NETISR_H_ 37 #include <net/netisr.h> /* struct notifymsglist */ 38 #endif 39 #if defined(_KERNEL) || defined(_KERNEL_STRUCTURES) 40 #include <sys/queue.h> 41 #endif 42 43 #define EVFILT_READ (-1) 44 #define EVFILT_WRITE (-2) 45 #define EVFILT_AIO (-3) /* attached to aio requests */ 46 #define EVFILT_VNODE (-4) /* attached to vnodes */ 47 #define EVFILT_PROC (-5) /* attached to struct proc */ 48 #define EVFILT_SIGNAL (-6) /* attached to struct proc */ 49 #define EVFILT_TIMER (-7) /* timers */ 50 #define EVFILT_EXCEPT (-8) /* exceptional conditions */ 51 #define EVFILT_USER (-9) /* user events */ 52 53 #define EVFILT_MARKER 0xF /* placemarker for tailq */ 54 55 #define EVFILT_SYSCOUNT 9 56 57 #define EV_SET(kevp_, a, b, c, d, e, f) do { \ 58 struct kevent *kevp = (kevp_); \ 59 (kevp)->ident = (a); \ 60 (kevp)->filter = (b); \ 61 (kevp)->flags = (c); \ 62 (kevp)->fflags = (d); \ 63 (kevp)->data = (e); \ 64 (kevp)->udata = (f); \ 65 } while(0) 66 67 struct kevent { 68 uintptr_t ident; /* identifier for this event */ 69 short filter; /* filter for event */ 70 u_short flags; 71 u_int fflags; 72 intptr_t data; 73 void *udata; /* opaque user data identifier */ 74 }; 75 76 /* actions */ 77 #define EV_ADD 0x0001 /* add event to kq (implies enable) */ 78 #define EV_DELETE 0x0002 /* delete event from kq */ 79 #define EV_ENABLE 0x0004 /* enable event */ 80 #define EV_DISABLE 0x0008 /* disable event (not reported) */ 81 82 /* flags */ 83 #define EV_ONESHOT 0x0010 /* only report one occurrence */ 84 #define EV_CLEAR 0x0020 /* clear event state after reporting */ 85 86 #define EV_SYSFLAGS 0xF000 /* reserved by system */ 87 #define EV_FLAG1 0x2000 /* filter-specific flag */ 88 89 /* returned values */ 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 struct notifymsglist ki_mlist; /* list of pending predicate messages */ 163 }; 164 165 #endif 166 167 #ifdef _KERNEL 168 169 /* 170 * Global token for kqueue subsystem 171 */ 172 extern struct lwkt_token kq_token; 173 174 #ifdef MALLOC_DECLARE 175 MALLOC_DECLARE(M_KQUEUE); 176 #endif 177 178 #define KNOTE(list, hint) if ((list) != NULL) knote(list, hint) 179 180 /* 181 * Flag indicating hint is a signal. Used by EVFILT_SIGNAL, and also 182 * shared by EVFILT_PROC (all knotes attached to p->p_klist) 183 * 184 * NOTE_OLDAPI is used to signal that standard filters are being called 185 * from the select/poll wrapper. 186 */ 187 #define NOTE_SIGNAL 0x08000000 188 #define NOTE_OLDAPI 0x04000000 /* select/poll note */ 189 190 #define FILTEROP_ISFD 0x0001 /* if ident == filedescriptor */ 191 #define FILTEROP_MPSAFE 0x0002 192 193 struct filterops { 194 u_short f_flags; 195 196 /* f_attach returns 0 on success or valid error code on failure */ 197 int (*f_attach) (struct knote *kn); 198 void (*f_detach) (struct knote *kn); 199 200 /* f_event returns boolean truth */ 201 int (*f_event) (struct knote *kn, long hint); 202 }; 203 204 struct knote { 205 SLIST_ENTRY(knote) kn_link; /* for fd */ 206 TAILQ_ENTRY(knote) kn_kqlink; /* for kq_knlist */ 207 SLIST_ENTRY(knote) kn_next; /* for struct kqinfo */ 208 TAILQ_ENTRY(knote) kn_tqe; /* for kq_head */ 209 struct kqueue *kn_kq; /* which queue we are on */ 210 struct kevent kn_kevent; 211 int kn_status; 212 int kn_sfflags; /* saved filter flags */ 213 intptr_t kn_sdata; /* saved data field */ 214 union { 215 struct file *p_fp; /* file data pointer */ 216 struct proc *p_proc; /* proc pointer */ 217 int hookid; 218 } kn_ptr; 219 struct filterops *kn_fop; 220 caddr_t kn_hook; 221 }; 222 223 #define KN_ACTIVE 0x0001 /* event has been triggered */ 224 #define KN_QUEUED 0x0002 /* event is on queue */ 225 #define KN_DISABLED 0x0004 /* event is disabled */ 226 #define KN_DETACHED 0x0008 /* knote is detached */ 227 #define KN_REPROCESS 0x0010 /* force reprocessing race */ 228 #define KN_DELETING 0x0020 /* deletion in progress */ 229 #define KN_PROCESSING 0x0040 /* event processing in prog */ 230 #define KN_WAITING 0x0080 /* waiting on processing */ 231 232 #define kn_id kn_kevent.ident 233 #define kn_filter kn_kevent.filter 234 #define kn_flags kn_kevent.flags 235 #define kn_fflags kn_kevent.fflags 236 #define kn_data kn_kevent.data 237 #define kn_fp kn_ptr.p_fp 238 239 struct proc; 240 struct thread; 241 struct filedesc; 242 struct kevent_args; 243 244 typedef int (*k_copyout_fn)(void *arg, struct kevent *kevp, int count, 245 int *res); 246 typedef int (*k_copyin_fn)(void *arg, struct kevent *kevp, int max, 247 int *events); 248 int kern_kevent(struct kqueue *kq, int nevents, int *res, void *uap, 249 k_copyin_fn kevent_copyin, k_copyout_fn kevent_copyout, 250 struct timespec *tsp); 251 252 extern void knote(struct klist *list, long hint); 253 extern void knote_insert(struct klist *klist, struct knote *kn); 254 extern void knote_remove(struct klist *klist, struct knote *kn); 255 /*extern void knote_empty(struct klist *list);*/ 256 extern void knote_assume_knotes(struct kqinfo *, struct kqinfo *, 257 struct filterops *, void *); 258 extern void knote_fdclose(struct file *fp, struct filedesc *fdp, int fd); 259 extern void kqueue_init(struct kqueue *kq, struct filedesc *fdp); 260 extern void kqueue_terminate(struct kqueue *kq); 261 extern int kqueue_register(struct kqueue *kq, struct kevent *kev); 262 263 #endif /* _KERNEL */ 264 265 #if !defined(_KERNEL) || defined(_KERNEL_VIRTUAL) 266 267 #include <sys/cdefs.h> 268 struct timespec; 269 270 __BEGIN_DECLS 271 int kqueue (void); 272 int kevent (int, const struct kevent *, int, struct kevent *, 273 int, const struct timespec *); 274 __END_DECLS 275 #endif /* !_KERNEL */ 276 277 #endif /* !_SYS_EVENT_H_ */ 278