bsd/sys/event.h

   1 /*
   2  * Copyright (c) 2003-2005 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
   5  *
   6  * This file contains Original Code and/or Modifications of Original Code
   7  * as defined in and that are subject to the Apple Public Source License
   8  * Version 2.0 (the 'License'). You may not use this file except in
   9  * compliance with the License. The rights granted to you under the License
  10  * may not be used to create, or enable the creation or redistribution of,
  11  * unlawful or unlicensed copies of an Apple operating system, or to
  12  * circumvent, violate, or enable the circumvention or violation of, any
  13  * terms of an Apple operating system software license agreement.
  14  *
  15  * Please obtain a copy of the License at
  16  * http://www.opensource.apple.com/apsl/ and read it before using this file.
  17  *
  18  * The Original Code and all software distributed under the License are
  19  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  20  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  21  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  22  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  23  * Please see the License for the specific language governing rights and
  24  * limitations under the License.
  25  *
  26  * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
  27  */
  28 /*-
  29  * Copyright (c) 1999,2000,2001 Jonathan Lemon <jlemon@FreeBSD.org>
  30  * All rights reserved.
  31  *
  32  * Redistribution and use in source and binary forms, with or without
  33  * modification, are permitted provided that the following conditions
  34  * are met:
  35  * 1. Redistributions of source code must retain the above copyright
  36  *    notice, this list of conditions and the following disclaimer.
  37  * 2. Redistributions in binary form must reproduce the above copyright
  38  *    notice, this list of conditions and the following disclaimer in the
  39  *    documentation and/or other materials provided with the distribution.
  40  *
  41  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  42  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  43  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  44  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  45  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  46  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  47  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  48  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  49  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  50  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  51  * SUCH DAMAGE.
  52  *
  53  *      $FreeBSD: src/sys/sys/event.h,v 1.5.2.5 2001/12/14 19:21:22 jlemon Exp $
  54  */
  55
  56 #ifndef _SYS_EVENT_H_
  57 #define _SYS_EVENT_H_
  58
  59 #include <machine/types.h>
  60 #include <sys/cdefs.h>
  61 #include <stdint.h>
  62
  63 #define EVFILT_READ             (-1)
  64 #define EVFILT_WRITE            (-2)
  65 #define EVFILT_AIO              (-3)    /* attached to aio requests */
  66 #define EVFILT_VNODE            (-4)    /* attached to vnodes */
  67 #define EVFILT_PROC             (-5)    /* attached to struct proc */
  68 #define EVFILT_SIGNAL           (-6)    /* attached to struct proc */
  69 #define EVFILT_TIMER            (-7)    /* timers */
  70 #define EVFILT_MACHPORT         (-8)    /* Mach ports */
  71 #define EVFILT_FS               (-9)    /* Filesystem events */
  72
  73 #define EVFILT_SYSCOUNT         9
  74 #define EVFILT_THREADMARKER     EVFILT_SYSCOUNT /* Internal use only */
  75
  76 #pragma pack(4)
  77
  78 struct kevent {
  79         uintptr_t       ident;          /* identifier for this event */
  80         short           filter;         /* filter for event */
  81         unsigned short  flags;          /* general flags */
  82         unsigned int    fflags;         /* filter-specific flags */
  83         intptr_t        data;           /* filter-specific data */
  84 #ifdef KERNEL_PRIVATE
  85         user_addr_t     udata;          /* opaque user data identifier */
  86 #else
  87         void            *udata;         /* opaque user data identifier */
  88 #endif
  89 };
  90
  91 #ifdef KERNEL_PRIVATE
  92
  93 struct user_kevent {
  94         uint64_t        ident;          /* identifier for this event */
  95         short           filter;         /* filter for event */
  96         unsigned short  flags;          /* general flags */
  97         unsigned int    fflags;         /* filter-specific flags */
  98         int64_t         data;           /* filter-specific data */
  99         user_addr_t     udata;          /* opaque user data identifier */
 100 };
 101
 102 #endif
 103
 104 #pragma pack()
 105
 106 #define EV_SET(kevp, a, b, c, d, e, f) do {     \
 107         struct kevent *__kevp__ = (kevp);       \
 108         __kevp__->ident = (a);                  \
 109         __kevp__->filter = (b);                 \
 110         __kevp__->flags = (c);                  \
 111         __kevp__->fflags = (d);                 \
 112         __kevp__->data = (e);                   \
 113         __kevp__->udata = (f);                  \
 114 } while(0)
 115
 116 /* actions */
 117 #define EV_ADD          0x0001          /* add event to kq (implies enable) */
 118 #define EV_DELETE       0x0002          /* delete event from kq */
 119 #define EV_ENABLE       0x0004          /* enable event */
 120 #define EV_DISABLE      0x0008          /* disable event (not reported) */
 121
 122 /* flags */
 123 #define EV_ONESHOT      0x0010          /* only report one occurrence */
 124 #define EV_CLEAR        0x0020          /* clear event state after reporting */
 125
 126 #define EV_SYSFLAGS     0xF000          /* reserved by system */
 127 #define EV_FLAG0        0x1000          /* filter-specific flag */
 128 #define EV_FLAG1        0x2000          /* filter-specific flag */
 129
 130 /* returned values */
 131 #define EV_EOF          0x8000          /* EOF detected */
 132 #define EV_ERROR        0x4000          /* error, data contains errno */
 133
 134 /*
 135  * Filter specific flags for EVFILT_READ
 136  *
 137  * The default behavior for EVFILT_READ is to make the "read" determination
 138  * relative to the current file descriptor read pointer. The EV_POLL
 139  * flag indicates the determination should be made via poll(2) semantics
 140  * (which always returns true for regular files - regardless of the amount
 141  * of unread data in the file).
 142  *
 143  * On input, EV_OOBAND specifies that only OOB data should be looked for.
 144  * The returned data count is the number of bytes beyond the current OOB marker.
 145  *
 146  * On output, EV_OOBAND indicates that OOB data is present
 147  * If it was not specified as an input parameter, then the data count is the
 148  * number of bytes before the current OOB marker. If at the marker, the
 149  * data count indicates the number of bytes available after it.  In either
 150  * case, it's the amount of data one could expect to receive next.
 151  */
 152 #define EV_POLL EV_FLAG0
 153 #define EV_OOBAND       EV_FLAG1
 154
 155 /*
 156  * data/hint fflags for EVFILT_{READ|WRITE}, shared with userspace
 157  *
 158  * The default behavior for EVFILT_READ is to make the determination
 159  * realtive to the current file descriptor read pointer.
 160  */
 161 #define NOTE_LOWAT      0x00000001              /* low water mark */
 162 /*
 163  * data/hint fflags for EVFILT_VNODE, shared with userspace
 164  */
 165 #define NOTE_DELETE     0x00000001              /* vnode was removed */
 166 #define NOTE_WRITE      0x00000002              /* data contents changed */
 167 #define NOTE_EXTEND     0x00000004              /* size increased */
 168 #define NOTE_ATTRIB     0x00000008              /* attributes changed */
 169 #define NOTE_LINK       0x00000010              /* link count changed */
 170 #define NOTE_RENAME     0x00000020              /* vnode was renamed */
 171 #define NOTE_REVOKE     0x00000040              /* vnode access was revoked */
 172
 173 /*
 174  * data/hint fflags for EVFILT_PROC, shared with userspace
 175  */
 176 #define NOTE_EXIT       0x80000000              /* process exited */
 177 #define NOTE_FORK       0x40000000              /* process forked */
 178 #define NOTE_EXEC       0x20000000              /* process exec'd */
 179 #define NOTE_PCTRLMASK  0xf0000000              /* mask for hint bits */
 180 #define NOTE_PDATAMASK  0x000fffff              /* mask for pid */
 181
 182 /*
 183  * data/hint fflags for EVFILT_TIMER, shared with userspace.
 184  * The default is a (repeating) interval timer with the data
 185  * specifying the timeout interval in milliseconds.
 186  *
 187  * All timeouts are implicitly EV_CLEAR events.
 188  */
 189 #define NOTE_SECONDS    0x00000001              /* data is seconds         */
 190 #define NOTE_USECONDS   0x00000002              /* data is microseconds    */
 191 #define NOTE_NSECONDS   0x00000004              /* data is nanoseconds     */
 192 #define NOTE_ABSOLUTE   0x00000008              /* absolute timeout        */
 193                                                 /* ... implicit EV_ONESHOT */
 194
 195 /* additional flags for EVFILT_PROC */
 196 #define NOTE_TRACK      0x00000001              /* follow across forks */
 197 #define NOTE_TRACKERR   0x00000002              /* could not track child */
 198 #define NOTE_CHILD      0x00000004              /* am a child process */
 199
 200
 201
 202 #ifndef KERNEL
 203 /* Temporay solution for BootX to use inode.h till kqueue moves to vfs layer */
 204 #include <sys/queue.h>
 205 struct knote;
 206 SLIST_HEAD(klist, knote);
 207 #endif
 208
 209 #ifdef KERNEL
 210
 211 #ifdef KERNEL_PRIVATE
 212 #include <sys/queue.h>
 213
 214 #ifdef MALLOC_DECLARE
 215 MALLOC_DECLARE(M_KQUEUE);
 216 #endif
 217
 218 /*
 219  * Flag indicating hint is a signal.  Used by EVFILT_SIGNAL, and also
 220  * shared by EVFILT_PROC  (all knotes attached to p->p_klist)
 221  */
 222 #define NOTE_SIGNAL     0x08000000
 223
 224 TAILQ_HEAD(kqtailq, knote);     /* a list of "queued" events */
 225
 226 struct knote {
 227         int             kn_inuse;       /* inuse count */
 228         struct kqtailq  *kn_tq;         /* pointer to tail queue */
 229         TAILQ_ENTRY(knote)      kn_tqe;         /* linkage for tail queue */
 230         struct kqueue   *kn_kq; /* which kqueue we are on */
 231         SLIST_ENTRY(knote)      kn_link;        /* linkage for search list */
 232         SLIST_ENTRY(knote)      kn_selnext;     /* klist element chain */
 233         union {
 234                 struct          fileproc *p_fp; /* file data pointer */
 235                 struct          proc *p_proc;   /* proc pointer */
 236         } kn_ptr;
 237         struct                  filterops *kn_fop;
 238         int                     kn_status;      /* status bits */
 239         int                     kn_sfflags;     /* saved filter flags */
 240         struct                  kevent kn_kevent;
 241         caddr_t                 kn_hook;
 242         int                     kn_hookid;
 243         int64_t                 kn_sdata;       /* saved data field */
 244
 245 #define KN_ACTIVE       0x01                    /* event has been triggered */
 246 #define KN_QUEUED       0x02                    /* event is on queue */
 247 #define KN_DISABLED     0x04                    /* event is disabled */
 248 #define KN_DROPPING     0x08                    /* knote is being dropped */
 249 #define KN_USEWAIT      0x10                    /* wait for knote use */
 250 #define KN_DROPWAIT     0x20                    /* wait for knote drop */
 251
 252 #define kn_id           kn_kevent.ident
 253 #define kn_filter       kn_kevent.filter
 254 #define kn_flags        kn_kevent.flags
 255 #define kn_fflags       kn_kevent.fflags
 256 #define kn_data         kn_kevent.data
 257 #define kn_fp           kn_ptr.p_fp
 258 };
 259
 260 struct filterops {
 261         int     f_isfd;         /* true if ident == filedescriptor */
 262         int     (*f_attach)(struct knote *kn);
 263         void    (*f_detach)(struct knote *kn);
 264         int     (*f_event)(struct knote *kn, long hint);
 265 };
 266
 267 struct proc;
 268
 269 SLIST_HEAD(klist, knote);
 270 extern void     klist_init(struct klist *list);
 271
 272 #define KNOTE(list, hint)       knote(list, hint)
 273 #define KNOTE_ATTACH(list, kn)  knote_attach(list, kn)
 274 #define KNOTE_DETACH(list, kn)  knote_detach(list, kn)
 275
 276
 277 extern void     knote(struct klist *list, long hint);
 278 extern int      knote_attach(struct klist *list, struct knote *kn);
 279 extern int      knote_detach(struct klist *list, struct knote *kn);
 280 extern void     knote_fdclose(struct proc *p, int fd);
 281
 282 #endif /* !KERNEL_PRIVATE */
 283
 284 #else   /* KERNEL */
 285
 286
 287 struct timespec;
 288
 289 __BEGIN_DECLS
 290 int     kqueue(void);
 291 int     kevent(int kq, const struct kevent *changelist, int nchanges,
 292                     struct kevent *eventlist, int nevents,
 293                     const struct timespec *timeout);
 294 __END_DECLS
 295
 296
 297 #ifdef PRIVATE
 298 #include <mach/port.h>
 299
 300 __BEGIN_DECLS
 301 mach_port_t     kqueue_portset_np(int kq);
 302 int     kqueue_from_portset_np(mach_port_t portset);
 303 __END_DECLS
 304 #endif /* PRIVATE */
 305
 306 #endif /* KERNEL */
 307
 308
 309 #endif /* !_SYS_EVENT_H_ */