bsd/sys/event.h

   1 /*
   2  * Copyright (c) 2003-2006 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 portsets */
  71 #define EVFILT_FS               (-9)    /* Filesystem events */
  72 #define EVFILT_USER             (-10)   /* User events */
  73 #define EVFILT_SESSION          (-11)   /* Audit session events */
  74
  75 #define EVFILT_SYSCOUNT         11
  76 #define EVFILT_THREADMARKER     EVFILT_SYSCOUNT /* Internal use only */
  77
  78 #pragma pack(4)
  79
  80 struct kevent {
  81         uintptr_t       ident;          /* identifier for this event */
  82         int16_t         filter;         /* filter for event */
  83         uint16_t        flags;          /* general flags */
  84         uint32_t        fflags;         /* filter-specific flags */
  85         intptr_t        data;           /* filter-specific data */
  86         void            *udata;         /* opaque user data identifier */
  87 };
  88
  89 #ifdef KERNEL_PRIVATE
  90
  91 struct user64_kevent {
  92         uint64_t        ident;          /* identifier for this event */
  93         int16_t         filter;         /* filter for event */
  94         uint16_t        flags;          /* general flags */
  95         uint32_t        fflags;         /* filter-specific flags */
  96         int64_t         data;           /* filter-specific data */
  97         user_addr_t     udata;          /* opaque user data identifier */
  98 };
  99
 100 struct user32_kevent {
 101         uint32_t        ident;          /* identifier for this event */
 102         int16_t         filter;         /* filter for event */
 103         uint16_t        flags;          /* general flags */
 104         uint32_t        fflags;         /* filter-specific flags */
 105         int32_t         data;           /* filter-specific data */
 106         user32_addr_t   udata;          /* opaque user data identifier */
 107 };
 108
 109 #endif
 110
 111 #pragma pack()
 112
 113 struct kevent64_s {
 114         uint64_t        ident;          /* identifier for this event */
 115         int16_t         filter;         /* filter for event */
 116         uint16_t        flags;          /* general flags */
 117         uint32_t        fflags;         /* filter-specific flags */
 118         int64_t         data;           /* filter-specific data */
 119         uint64_t        udata;          /* opaque user data identifier */
 120         uint64_t        ext[2];         /* filter-specific extensions */
 121 };
 122
 123 #define EV_SET(kevp, a, b, c, d, e, f) do {     \
 124         struct kevent *__kevp__ = (kevp);       \
 125         __kevp__->ident = (a);                  \
 126         __kevp__->filter = (b);                 \
 127         __kevp__->flags = (c);                  \
 128         __kevp__->fflags = (d);                 \
 129         __kevp__->data = (e);                   \
 130         __kevp__->udata = (f);                  \
 131 } while(0)
 132
 133 #define EV_SET64(kevp, a, b, c, d, e, f, g, h) do {     \
 134         struct kevent64_s *__kevp__ = (kevp);           \
 135         __kevp__->ident = (a);                          \
 136         __kevp__->filter = (b);                         \
 137         __kevp__->flags = (c);                          \
 138         __kevp__->fflags = (d);                         \
 139         __kevp__->data = (e);                           \
 140         __kevp__->udata = (f);                          \
 141         __kevp__->ext[0] = (g);                         \
 142         __kevp__->ext[1] = (h);                         \
 143 } while(0)
 144
 145 /* actions */
 146 #define EV_ADD          0x0001          /* add event to kq (implies enable) */
 147 #define EV_DELETE       0x0002          /* delete event from kq */
 148 #define EV_ENABLE       0x0004          /* enable event */
 149 #define EV_DISABLE      0x0008          /* disable event (not reported) */
 150 #define EV_RECEIPT      0x0040          /* force EV_ERROR on success, data == 0 */
 151
 152 /* flags */
 153 #define EV_ONESHOT      0x0010          /* only report one occurrence */
 154 #define EV_CLEAR        0x0020          /* clear event state after reporting */
 155 #define EV_DISPATCH     0x0080          /* disable event after reporting */
 156
 157 #define EV_SYSFLAGS     0xF000          /* reserved by system */
 158 #define EV_FLAG0        0x1000          /* filter-specific flag */
 159 #define EV_FLAG1        0x2000          /* filter-specific flag */
 160
 161 /* returned values */
 162 #define EV_EOF          0x8000          /* EOF detected */
 163 #define EV_ERROR        0x4000          /* error, data contains errno */
 164
 165 /*
 166  * Filter specific flags for EVFILT_READ
 167  *
 168  * The default behavior for EVFILT_READ is to make the "read" determination
 169  * relative to the current file descriptor read pointer. The EV_POLL
 170  * flag indicates the determination should be made via poll(2) semantics
 171  * (which always returns true for regular files - regardless of the amount
 172  * of unread data in the file).
 173  *
 174  * On input, EV_OOBAND specifies that only OOB data should be looked for.
 175  * The returned data count is the number of bytes beyond the current OOB marker.
 176  *
 177  * On output, EV_OOBAND indicates that OOB data is present
 178  * If it was not specified as an input parameter, then the data count is the
 179  * number of bytes before the current OOB marker. If at the marker, the
 180  * data count indicates the number of bytes available after it.  In either
 181  * case, it's the amount of data one could expect to receive next.
 182  */
 183 #define EV_POLL EV_FLAG0
 184 #define EV_OOBAND       EV_FLAG1
 185
 186 /*
 187  * data/hint fflags for EVFILT_USER, shared with userspace
 188  */
 189
 190 /*
 191  * On input, NOTE_TRIGGER causes the event to be triggered for output.
 192  */
 193 #define NOTE_TRIGGER    0x01000000
 194 #define EV_TRIGGER      0x0100 /*deprecated--for backwards compatibility only*/
 195
 196 /*
 197  * On input, the top two bits of fflags specifies how the lower twenty four
 198  * bits should be applied to the stored value of fflags.
 199  *
 200  * On output, the top two bits will always be set to NOTE_FFNOP and the
 201  * remaining twenty four bits will contain the stored fflags value.
 202  */
 203 #define NOTE_FFNOP      0x00000000              /* ignore input fflags */
 204 #define NOTE_FFAND      0x40000000              /* and fflags */
 205 #define NOTE_FFOR       0x80000000              /* or fflags */
 206 #define NOTE_FFCOPY     0xc0000000              /* copy fflags */
 207 #define NOTE_FFCTRLMASK 0xc0000000              /* mask for operations */
 208 #define NOTE_FFLAGSMASK 0x00ffffff
 209
 210 /*
 211  * data/hint fflags for EVFILT_{READ|WRITE}, shared with userspace
 212  *
 213  * The default behavior for EVFILT_READ is to make the determination
 214  * realtive to the current file descriptor read pointer.
 215  */
 216 #define NOTE_LOWAT      0x00000001              /* low water mark */
 217 /*
 218  * data/hint fflags for EVFILT_VNODE, shared with userspace
 219  */
 220 #define NOTE_DELETE     0x00000001              /* vnode was removed */
 221 #define NOTE_WRITE      0x00000002              /* data contents changed */
 222 #define NOTE_EXTEND     0x00000004              /* size increased */
 223 #define NOTE_ATTRIB     0x00000008              /* attributes changed */
 224 #define NOTE_LINK       0x00000010              /* link count changed */
 225 #define NOTE_RENAME     0x00000020              /* vnode was renamed */
 226 #define NOTE_REVOKE     0x00000040              /* vnode access was revoked */
 227 #define NOTE_NONE       0x00000080              /* No specific vnode event: to test for EVFILT_READ activation*/
 228
 229 /*
 230  * data/hint fflags for EVFILT_PROC, shared with userspace
 231  *
 232  * Please note that EVFILT_PROC and EVFILT_SIGNAL share the same knote list
 233  * that hangs off the proc structure. They also both play games with the hint
 234  * passed to KNOTE(). If NOTE_SIGNAL is passed as a hint, then the lower bits
 235  * of the hint contain the signal. IF NOTE_FORK is passed, then the lower bits
 236  * contain the PID of the child.
 237  */
 238 #define NOTE_EXIT       0x80000000              /* process exited */
 239 #define NOTE_FORK       0x40000000              /* process forked */
 240 #define NOTE_EXEC       0x20000000              /* process exec'd */
 241 #define NOTE_REAP       0x10000000              /* process reaped */
 242 #define NOTE_SIGNAL     0x08000000              /* shared with EVFILT_SIGNAL */
 243 #define NOTE_PDATAMASK  0x000fffff              /* mask for pid/signal */
 244 #define NOTE_PCTRLMASK  (~NOTE_PDATAMASK)
 245
 246 /*
 247  * data/hint fflags for EVFILT_TIMER, shared with userspace.
 248  * The default is a (repeating) interval timer with the data
 249  * specifying the timeout interval in milliseconds.
 250  *
 251  * All timeouts are implicitly EV_CLEAR events.
 252  */
 253 #define NOTE_SECONDS    0x00000001              /* data is seconds         */
 254 #define NOTE_USECONDS   0x00000002              /* data is microseconds    */
 255 #define NOTE_NSECONDS   0x00000004              /* data is nanoseconds     */
 256 #define NOTE_ABSOLUTE   0x00000008              /* absolute timeout        */
 257                                                 /* ... implicit EV_ONESHOT */
 258 /*
 259  * data/hint fflags for EVFILT_MACHPORT, shared with userspace.
 260  *
 261  * Only portsets are support at this time.
 262  *
 263  * The fflags field can optionally contain the MACH_RCV_MSG, MACH_RCV_LARGE,
 264  * and related trailer receive options as defined in <mach/message.h>.
 265  * The presence of these flags directs the kevent64() call to attempt to receive
 266  * the message during kevent delivery, rather than just indicate that a message exists.
 267  * On setup, The ext[0] field contains the receive buffer pointer and ext[1] contains
 268  * the receive buffer length.  Upon event delivery, the actual received message size
 269  * is returned in ext[1].  As with mach_msg(), the buffer must be large enough to
 270  * receive the message and the requested (or default) message trailers.  In addition,
 271  * the fflags field contains the return code normally returned by mach_msg().
 272  *
 273  * If no message receipt options were provided in the fflags field on setup, no
 274  * message is received by this call. Instead, on output, the data field simply
 275  * contains the name of the actual port detected with a message waiting.
 276  */
 277
 278 /*
 279  * data/hint fflags for EVFILT_SESSION, shared with userspace.
 280  *
 281  * The kevent ident field should be set to AU_SESSION_ANY_ASID if interested
 282  * in events for any session.
 283  *
 284  * NOTE_AS_UPDATE may be going away since struct auditinfo_addr may become
 285  * immutable once initially set.
 286  */
 287 #define NOTE_AS_START   0x00000001              /* start of new session */
 288 #define NOTE_AS_END     0x00000002              /* start of new session */
 289 #define NOTE_AS_ERR     0x00000004              /* error tracking new session */
 290 #define NOTE_AS_CLOSE   0x00000008              /* currently unsupported */
 291 #define NOTE_AS_UPDATE  0x00000010              /* session data updated */
 292
 293 /*
 294  * Kevent ident value for any session.
 295  */
 296 #define AS_ANY_ASID     0xFFFFFFFF
 297
 298 struct au_sentry;       /* Audit session entry */
 299
 300
 301 /*
 302  * DEPRECATED!!!!!!!!!
 303  * NOTE_TRACK, NOTE_TRACKERR, and NOTE_CHILD are no longer supported as of 10.5
 304  */
 305 /* additional flags for EVFILT_PROC */
 306 #define NOTE_TRACK      0x00000001              /* follow across forks */
 307 #define NOTE_TRACKERR   0x00000002              /* could not track child */
 308 #define NOTE_CHILD      0x00000004              /* am a child process */
 309
 310
 311
 312 #ifndef KERNEL
 313 /* Temporay solution for BootX to use inode.h till kqueue moves to vfs layer */
 314 #include <sys/queue.h>
 315 struct knote;
 316 SLIST_HEAD(klist, knote);
 317 #endif
 318
 319 #ifdef KERNEL
 320
 321 #ifdef KERNEL_PRIVATE
 322 #include <sys/queue.h>
 323
 324 #ifdef MALLOC_DECLARE
 325 MALLOC_DECLARE(M_KQUEUE);
 326 #endif
 327
 328 TAILQ_HEAD(kqtailq, knote);     /* a list of "queued" events */
 329
 330 struct knote {
 331         int             kn_inuse;       /* inuse count */
 332         struct kqtailq  *kn_tq;         /* pointer to tail queue */
 333         TAILQ_ENTRY(knote)      kn_tqe;         /* linkage for tail queue */
 334         struct kqueue   *kn_kq; /* which kqueue we are on */
 335         SLIST_ENTRY(knote)      kn_link;        /* linkage for search list */
 336         SLIST_ENTRY(knote)      kn_selnext;     /* klist element chain */
 337         union {
 338                 struct          fileproc *p_fp; /* file data pointer */
 339                 struct          proc *p_proc;   /* proc pointer */
 340                 struct          ipc_pset *p_pset;       /* pset pointer */
 341                 struct          au_sentry *p_se;        /* Audit session ptr */
 342         } kn_ptr;
 343         struct                  filterops *kn_fop;
 344         int                     kn_status;      /* status bits */
 345         int                     kn_sfflags;     /* saved filter flags */
 346         struct                  kevent64_s kn_kevent;
 347         void                    *kn_hook;
 348         int                     kn_hookid;
 349         int64_t                 kn_sdata;       /* saved data field */
 350
 351 #define KN_ACTIVE       0x01                    /* event has been triggered */
 352 #define KN_QUEUED       0x02                    /* event is on queue */
 353 #define KN_DISABLED     0x04                    /* event is disabled */
 354 #define KN_DROPPING     0x08                    /* knote is being dropped */
 355 #define KN_USEWAIT      0x10                    /* wait for knote use */
 356 #define KN_ATTACHING    0x20                    /* event is pending attach */
 357 #define KN_STAYQUEUED   0x40                    /* force event to stay on queue */
 358
 359 #define kn_id           kn_kevent.ident
 360 #define kn_filter       kn_kevent.filter
 361 #define kn_flags        kn_kevent.flags
 362 #define kn_fflags       kn_kevent.fflags
 363 #define kn_data         kn_kevent.data
 364 #define kn_udata        kn_kevent.udata
 365 #define kn_ext          kn_kevent.ext
 366 #define kn_fp           kn_ptr.p_fp
 367 };
 368
 369 /* Hint values for f_touch filter operation */
 370 #define EVENT_REGISTER  1
 371 #define EVENT_PROCESS   2
 372
 373 struct filterops {
 374         int     f_isfd;         /* true if ident == filedescriptor */
 375         int     (*f_attach)(struct knote *kn);
 376         void    (*f_detach)(struct knote *kn);
 377         int     (*f_event)(struct knote *kn, long hint);
 378         /* Optional f_touch operation, called only if !f_isfd && non-NULL */
 379         void    (*f_touch)(struct knote *kn, struct kevent64_s *kev, long type);
 380         /* Optional f_peek operation, called only if KN_STAYQUEUED is set */
 381         int     (*f_peek)(struct knote *kn);
 382 };
 383
 384 struct proc;
 385 struct wait_queue;
 386
 387 SLIST_HEAD(klist, knote);
 388 extern void     knote_init(void) __attribute__((section("__TEXT, initcode")));
 389 extern void     klist_init(struct klist *list);
 390
 391 #define KNOTE(list, hint)       knote(list, hint)
 392 #define KNOTE_ATTACH(list, kn)  knote_attach(list, kn)
 393 #define KNOTE_DETACH(list, kn)  knote_detach(list, kn)
 394
 395
 396 extern void     knote(struct klist *list, long hint);
 397 extern int      knote_attach(struct klist *list, struct knote *kn);
 398 extern int      knote_detach(struct klist *list, struct knote *kn);
 399 extern int      knote_link_wait_queue(struct knote *kn, struct wait_queue *wq);
 400 extern void     knote_unlink_wait_queue(struct knote *kn, struct wait_queue *wq);
 401 extern void     knote_fdclose(struct proc *p, int fd);
 402
 403 #endif /* !KERNEL_PRIVATE */
 404
 405 #else   /* KERNEL */
 406
 407
 408 struct timespec;
 409
 410 __BEGIN_DECLS
 411 int     kqueue(void);
 412 int     kevent(int kq, const struct kevent *changelist, int nchanges,
 413                     struct kevent *eventlist, int nevents,
 414                     const struct timespec *timeout);
 415 int     kevent64(int kq, const struct kevent64_s *changelist,
 416                     int nchanges, struct kevent64_s *eventlist,
 417                     int nevents, unsigned int flags,
 418                     const struct timespec *timeout);
 419 __END_DECLS
 420
 421
 422 #endif /* KERNEL */
 423
 424
 425 #endif /* !_SYS_EVENT_H_ */