bsd/sys/event.h

   1 /*
   2  * Copyright (c) 2003-2015 Apple 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                                         /* (-11) unused */
  74 #define EVFILT_VM               (-12)   /* Virtual memory events */
  75
  76 #ifdef PRIVATE
  77 #define EVFILT_SOCK             (-13)   /* Socket events */
  78 #define EVFILT_MEMORYSTATUS     (-14)   /* Memorystatus events */
  79 #endif /* PRIVATE */
  80
  81 #define EVFILT_SYSCOUNT         14
  82 #define EVFILT_THREADMARKER     EVFILT_SYSCOUNT /* Internal use only */
  83
  84 #pragma pack(4)
  85
  86 struct kevent {
  87         uintptr_t       ident;          /* identifier for this event */
  88         int16_t         filter;         /* filter for event */
  89         uint16_t        flags;          /* general flags */
  90         uint32_t        fflags;         /* filter-specific flags */
  91         intptr_t        data;           /* filter-specific data */
  92         void            *udata;         /* opaque user data identifier */
  93 };
  94
  95 #ifdef KERNEL_PRIVATE
  96
  97 struct user64_kevent {
  98         uint64_t        ident;          /* identifier for this event */
  99         int16_t         filter;         /* filter for event */
 100         uint16_t        flags;          /* general flags */
 101         uint32_t        fflags;         /* filter-specific flags */
 102         int64_t         data;           /* filter-specific data */
 103         user_addr_t     udata;          /* opaque user data identifier */
 104 };
 105
 106 struct user32_kevent {
 107         uint32_t        ident;          /* identifier for this event */
 108         int16_t         filter;         /* filter for event */
 109         uint16_t        flags;          /* general flags */
 110         uint32_t        fflags;         /* filter-specific flags */
 111         int32_t         data;           /* filter-specific data */
 112         user32_addr_t   udata;          /* opaque user data identifier */
 113 };
 114
 115 #endif
 116
 117 #pragma pack()
 118
 119 struct kevent64_s {
 120         uint64_t        ident;          /* identifier for this event */
 121         int16_t         filter;         /* filter for event */
 122         uint16_t        flags;          /* general flags */
 123         uint32_t        fflags;         /* filter-specific flags */
 124         int64_t         data;           /* filter-specific data */
 125         uint64_t        udata;          /* opaque user data identifier */
 126         uint64_t        ext[2];         /* filter-specific extensions */
 127 };
 128
 129 #define EV_SET(kevp, a, b, c, d, e, f) do {     \
 130         struct kevent *__kevp__ = (kevp);       \
 131         __kevp__->ident = (a);                  \
 132         __kevp__->filter = (b);                 \
 133         __kevp__->flags = (c);                  \
 134         __kevp__->fflags = (d);                 \
 135         __kevp__->data = (e);                   \
 136         __kevp__->udata = (f);                  \
 137 } while(0)
 138
 139 #define EV_SET64(kevp, a, b, c, d, e, f, g, h) do {     \
 140         struct kevent64_s *__kevp__ = (kevp);           \
 141         __kevp__->ident = (a);                          \
 142         __kevp__->filter = (b);                         \
 143         __kevp__->flags = (c);                          \
 144         __kevp__->fflags = (d);                         \
 145         __kevp__->data = (e);                           \
 146         __kevp__->udata = (f);                          \
 147         __kevp__->ext[0] = (g);                         \
 148         __kevp__->ext[1] = (h);                         \
 149 } while(0)
 150
 151 /* actions */
 152 #define EV_ADD          0x0001          /* add event to kq (implies enable) */
 153 #define EV_DELETE       0x0002          /* delete event from kq */
 154 #define EV_ENABLE       0x0004          /* enable event */
 155 #define EV_DISABLE      0x0008          /* disable event (not reported) */
 156 #define EV_RECEIPT      0x0040          /* force EV_ERROR on success, data == 0 */
 157
 158 /* flags */
 159 #define EV_ONESHOT      0x0010          /* only report one occurrence */
 160 #define EV_CLEAR        0x0020          /* clear event state after reporting */
 161 #define EV_DISPATCH     0x0080          /* disable event after reporting */
 162
 163 #define EV_SYSFLAGS     0xF000          /* reserved by system */
 164 #define EV_FLAG0        0x1000          /* filter-specific flag */
 165 #define EV_FLAG1        0x2000          /* filter-specific flag */
 166
 167 /* returned values */
 168 #define EV_EOF          0x8000          /* EOF detected */
 169 #define EV_ERROR        0x4000          /* error, data contains errno */
 170
 171 /*
 172  * Filter specific flags for EVFILT_READ
 173  *
 174  * The default behavior for EVFILT_READ is to make the "read" determination
 175  * relative to the current file descriptor read pointer. The EV_POLL
 176  * flag indicates the determination should be made via poll(2) semantics
 177  * (which always returns true for regular files - regardless of the amount
 178  * of unread data in the file).
 179  *
 180  * On input, EV_OOBAND specifies that filter should actively return in the
 181  * presence of OOB on the descriptor. It implies that filter will return
 182  * if there is OOB data available to read OR when any other condition
 183  * for the read are met (for example number of bytes regular data becomes >=
 184  * low-watermark).
 185  * If EV_OOBAND is not set on input, it implies that the filter should not actively
 186  * return for out of band data on the descriptor. The filter will then only return
 187  * when some other condition for read is met (ex: when number of regular data bytes
 188  * >=low-watermark OR when socket can't receive more data (SS_CANTRCVMORE)).
 189  *
 190  * On output, EV_OOBAND indicates the presence of OOB data on the descriptor.
 191  * If it was not specified as an input parameter, then the data count is the
 192  * number of bytes before the current OOB marker, else data count is the number
 193  * of bytes beyond OOB marker.
 194  */
 195 #define EV_POLL EV_FLAG0
 196 #define EV_OOBAND       EV_FLAG1
 197
 198 /*
 199  * data/hint fflags for EVFILT_USER, shared with userspace
 200  */
 201
 202 /*
 203  * On input, NOTE_TRIGGER causes the event to be triggered for output.
 204  */
 205 #define NOTE_TRIGGER    0x01000000
 206
 207 /*
 208  * On input, the top two bits of fflags specifies how the lower twenty four
 209  * bits should be applied to the stored value of fflags.
 210  *
 211  * On output, the top two bits will always be set to NOTE_FFNOP and the
 212  * remaining twenty four bits will contain the stored fflags value.
 213  */
 214 #define NOTE_FFNOP      0x00000000              /* ignore input fflags */
 215 #define NOTE_FFAND      0x40000000              /* and fflags */
 216 #define NOTE_FFOR       0x80000000              /* or fflags */
 217 #define NOTE_FFCOPY     0xc0000000              /* copy fflags */
 218 #define NOTE_FFCTRLMASK 0xc0000000              /* mask for operations */
 219 #define NOTE_FFLAGSMASK 0x00ffffff
 220
 221 /*
 222  * data/hint fflags for EVFILT_{READ|WRITE}, shared with userspace
 223  *
 224  * The default behavior for EVFILT_READ is to make the determination
 225  * realtive to the current file descriptor read pointer.
 226  */
 227 #define NOTE_LOWAT      0x00000001              /* low water mark */
 228 /*
 229  * data/hint fflags for EVFILT_VNODE, shared with userspace
 230  */
 231 #define NOTE_DELETE     0x00000001              /* vnode was removed */
 232 #define NOTE_WRITE      0x00000002              /* data contents changed */
 233 #define NOTE_EXTEND     0x00000004              /* size increased */
 234 #define NOTE_ATTRIB     0x00000008              /* attributes changed */
 235 #define NOTE_LINK       0x00000010              /* link count changed */
 236 #define NOTE_RENAME     0x00000020              /* vnode was renamed */
 237 #define NOTE_REVOKE     0x00000040              /* vnode access was revoked */
 238 #define NOTE_NONE       0x00000080              /* No specific vnode event: to test for EVFILT_READ activation*/
 239
 240 /*
 241  * data/hint fflags for EVFILT_PROC, shared with userspace
 242  *
 243  * Please note that EVFILT_PROC and EVFILT_SIGNAL share the same knote list
 244  * that hangs off the proc structure. They also both play games with the hint
 245  * passed to KNOTE(). If NOTE_SIGNAL is passed as a hint, then the lower bits
 246  * of the hint contain the signal. IF NOTE_FORK is passed, then the lower bits
 247  * contain the PID of the child (but the pid does not get passed through in
 248  * the actual kevent).
 249  */
 250 enum {
 251         eNoteReapDeprecated __deprecated_enum_msg("This kqueue(2) EVFILT_PROC flag is deprecated") = 0x10000000
 252 };
 253
 254 #define NOTE_EXIT               0x80000000      /* process exited */
 255 #define NOTE_FORK               0x40000000      /* process forked */
 256 #define NOTE_EXEC               0x20000000      /* process exec'd */
 257 #define NOTE_REAP               ((unsigned int)eNoteReapDeprecated /* 0x10000000 */)    /* process reaped */
 258 #define NOTE_SIGNAL             0x08000000      /* shared with EVFILT_SIGNAL */
 259 #define NOTE_EXITSTATUS         0x04000000      /* exit status to be returned, valid for child process only */
 260 #define NOTE_EXIT_DETAIL        0x02000000      /* provide details on reasons for exit */
 261
 262 #define NOTE_PDATAMASK  0x000fffff              /* mask for signal & exit status */
 263 #define NOTE_PCTRLMASK  (~NOTE_PDATAMASK)
 264
 265 /*
 266  * If NOTE_EXITSTATUS is present, provide additional info about exiting process.
 267  */
 268 enum {
 269         eNoteExitReparentedDeprecated __deprecated_enum_msg("This kqueue(2) EVFILT_PROC flag is no longer sent") = 0x00080000
 270 };
 271 #define NOTE_EXIT_REPARENTED    ((unsigned int)eNoteExitReparentedDeprecated)   /* exited while reparented */
 272
 273 /*
 274  * If NOTE_EXIT_DETAIL is present, these bits indicate specific reasons for exiting.
 275  */
 276 #define NOTE_EXIT_DETAIL_MASK           0x00070000
 277 #define NOTE_EXIT_DECRYPTFAIL           0x00010000
 278 #define NOTE_EXIT_MEMORY                0x00020000
 279 #define NOTE_EXIT_CSERROR               0x00040000
 280
 281 #ifdef PRIVATE
 282
 283 /*
 284  * If NOTE_EXIT_MEMORY is present, these bits indicate specific jetsam condition.
 285  */
 286 #define NOTE_EXIT_MEMORY_DETAIL_MASK    0xfe000000
 287 #define NOTE_EXIT_MEMORY_VMPAGESHORTAGE 0x80000000      /* jetsam condition: lowest jetsam priority proc killed due to vm page shortage */
 288 #define NOTE_EXIT_MEMORY_VMTHRASHING    0x40000000      /* jetsam condition: lowest jetsam priority proc killed due to vm thrashing */
 289 #define NOTE_EXIT_MEMORY_HIWAT          0x20000000      /* jetsam condition: process reached its high water mark */
 290 #define NOTE_EXIT_MEMORY_PID            0x10000000      /* jetsam condition: special pid kill requested */
 291 #define NOTE_EXIT_MEMORY_IDLE           0x08000000      /* jetsam condition: idle process cleaned up */
 292 #define NOTE_EXIT_MEMORY_VNODE          0X04000000      /* jetsam condition: virtual node kill */
 293 #define NOTE_EXIT_MEMORY_FCTHRASHING    0x02000000      /* jetsam condition: lowest jetsam priority proc killed due to filecache thrashing */
 294
 295 #endif
 296
 297 /*
 298  * data/hint fflags for EVFILT_VM, shared with userspace.
 299  */
 300 #define NOTE_VM_PRESSURE                        0x80000000              /* will react on memory pressure */
 301 #define NOTE_VM_PRESSURE_TERMINATE              0x40000000              /* will quit on memory pressure, possibly after cleaning up dirty state */
 302 #define NOTE_VM_PRESSURE_SUDDEN_TERMINATE       0x20000000              /* will quit immediately on memory pressure */
 303 #define NOTE_VM_ERROR                           0x10000000              /* there was an error */
 304
 305 #ifdef PRIVATE
 306
 307 /*
 308  * data/hint fflags for EVFILT_MEMORYSTATUS, shared with userspace.
 309  */
 310 #define NOTE_MEMORYSTATUS_PRESSURE_NORMAL       0x00000001      /* system memory pressure has returned to normal */
 311 #define NOTE_MEMORYSTATUS_PRESSURE_WARN         0x00000002      /* system memory pressure has changed to the warning state */
 312 #define NOTE_MEMORYSTATUS_PRESSURE_CRITICAL     0x00000004      /* system memory pressure has changed to the critical state */
 313 #define NOTE_MEMORYSTATUS_LOW_SWAP              0x00000008      /* system is in a low-swap state */
 314
 315 typedef enum vm_pressure_level {
 316         kVMPressureNormal   = 0,
 317         kVMPressureWarning  = 1,
 318         kVMPressureUrgent   = 2,
 319         kVMPressureCritical = 3,
 320 } vm_pressure_level_t;
 321
 322 #endif
 323
 324 /*
 325  * data/hint fflags for EVFILT_TIMER, shared with userspace.
 326  * The default is a (repeating) interval timer with the data
 327  * specifying the timeout interval in milliseconds.
 328  *
 329  * All timeouts are implicitly EV_CLEAR events.
 330  */
 331 #define NOTE_SECONDS    0x00000001              /* data is seconds         */
 332 #define NOTE_USECONDS   0x00000002              /* data is microseconds    */
 333 #define NOTE_NSECONDS   0x00000004              /* data is nanoseconds     */
 334 #define NOTE_ABSOLUTE   0x00000008              /* absolute timeout        */
 335                                                 /* ... implicit EV_ONESHOT */
 336 #define NOTE_LEEWAY     0x00000010              /* ext[1] holds leeway for power aware timers */
 337 #define NOTE_CRITICAL   0x00000020              /* system does minimal timer coalescing */
 338 #define NOTE_BACKGROUND 0x00000040              /* system does maximum timer coalescing */
 339 #ifdef PRIVATE
 340 /*
 341  * data/hint fflags for EVFILT_SOCK, shared with userspace.
 342  *
 343  */
 344 #define NOTE_CONNRESET          0x00000001 /* Received RST */
 345 #define NOTE_READCLOSED         0x00000002 /* Read side is shutdown */
 346 #define NOTE_WRITECLOSED        0x00000004 /* Write side is shutdown */
 347 #define NOTE_TIMEOUT            0x00000008 /* timeout: rexmt, keep-alive or persist */
 348 #define NOTE_NOSRCADDR          0x00000010 /* source address not available */
 349 #define NOTE_IFDENIED           0x00000020 /* interface denied connection */
 350 #define NOTE_SUSPEND            0x00000040 /* output queue suspended */
 351 #define NOTE_RESUME             0x00000080 /* output queue resumed */
 352 #define NOTE_KEEPALIVE          0x00000100 /* TCP Keepalive received */
 353 #define NOTE_ADAPTIVE_WTIMO     0x00000200 /* TCP adaptive write timeout */
 354 #define NOTE_ADAPTIVE_RTIMO     0x00000400 /* TCP adaptive read timeout */
 355 #define NOTE_CONNECTED          0x00000800 /* socket is connected */
 356 #define NOTE_DISCONNECTED       0x00001000 /* socket is disconnected */
 357 #define NOTE_CONNINFO_UPDATED   0x00002000 /* connection info was updated */
 358
 359 #endif /* PRIVATE */
 360
 361 /*
 362  * data/hint fflags for EVFILT_MACHPORT, shared with userspace.
 363  *
 364  * Only portsets are supported at this time.
 365  *
 366  * The fflags field can optionally contain the MACH_RCV_MSG, MACH_RCV_LARGE,
 367  * and related trailer receive options as defined in <mach/message.h>.
 368  * The presence of these flags directs the kevent64() call to attempt to receive
 369  * the message during kevent delivery, rather than just indicate that a message exists.
 370  * On setup, The ext[0] field contains the receive buffer pointer and ext[1] contains
 371  * the receive buffer length.  Upon event delivery, the actual received message size
 372  * is returned in ext[1].  As with mach_msg(), the buffer must be large enough to
 373  * receive the message and the requested (or default) message trailers.  In addition,
 374  * the fflags field contains the return code normally returned by mach_msg().
 375  *
 376  * If no message receipt options were provided in the fflags field on setup, no
 377  * message is received by this call. Instead, on output, the data field simply
 378  * contains the name of the actual port detected with a message waiting.
 379  */
 380
 381 /*
 382  * DEPRECATED!!!!!!!!!
 383  * NOTE_TRACK, NOTE_TRACKERR, and NOTE_CHILD are no longer supported as of 10.5
 384  */
 385 /* additional flags for EVFILT_PROC */
 386 #define NOTE_TRACK      0x00000001              /* follow across forks */
 387 #define NOTE_TRACKERR   0x00000002              /* could not track child */
 388 #define NOTE_CHILD      0x00000004              /* am a child process */
 389
 390
 391
 392 #ifndef KERNEL
 393 /* Temporay solution for BootX to use inode.h till kqueue moves to vfs layer */
 394 #include <sys/queue.h>
 395 struct knote;
 396 SLIST_HEAD(klist, knote);
 397 #endif
 398
 399 #ifdef KERNEL
 400
 401 #ifdef KERNEL_PRIVATE
 402 #include <sys/queue.h>
 403 #include <kern/kern_types.h>
 404
 405 #ifdef MALLOC_DECLARE
 406 MALLOC_DECLARE(M_KQUEUE);
 407 #endif
 408
 409 TAILQ_HEAD(kqtailq, knote);     /* a list of "queued" events */
 410
 411 struct knote {
 412         int             kn_inuse;       /* inuse count */
 413         struct kqtailq  *kn_tq;         /* pointer to tail queue */
 414         TAILQ_ENTRY(knote)      kn_tqe;         /* linkage for tail queue */
 415         struct kqueue   *kn_kq; /* which kqueue we are on */
 416         SLIST_ENTRY(knote)      kn_link;        /* linkage for search list */
 417         SLIST_ENTRY(knote)      kn_selnext;     /* klist element chain */
 418         union {
 419                 struct          fileproc *p_fp; /* file data pointer */
 420                 struct          proc *p_proc;   /* proc pointer */
 421                 struct          ipc_pset *p_pset;       /* pset pointer */
 422         } kn_ptr;
 423         struct                  filterops *kn_fop;
 424         int                     kn_status;      /* status bits */
 425         int                     kn_sfflags;     /* saved filter flags */
 426         struct                  kevent64_s kn_kevent;
 427         void                    *kn_hook;
 428         int                     kn_hookid;
 429         int64_t                 kn_sdata;       /* saved data field */
 430
 431 #define KN_ACTIVE       0x01                    /* event has been triggered */
 432 #define KN_QUEUED       0x02                    /* event is on queue */
 433 #define KN_DISABLED     0x04                    /* event is disabled */
 434 #define KN_DROPPING     0x08                    /* knote is being dropped */
 435 #define KN_USEWAIT      0x10                    /* wait for knote use */
 436 #define KN_ATTACHING    0x20                    /* event is pending attach */
 437 #define KN_STAYQUEUED   0x40                    /* force event to stay on queue */
 438
 439 #define kn_id           kn_kevent.ident
 440 #define kn_filter       kn_kevent.filter
 441 #define kn_flags        kn_kevent.flags
 442 #define kn_fflags       kn_kevent.fflags
 443 #define kn_data         kn_kevent.data
 444 #define kn_udata        kn_kevent.udata
 445 #define kn_ext          kn_kevent.ext
 446 #define kn_fp           kn_ptr.p_fp
 447 };
 448
 449 /* Hint values for f_touch filter operation */
 450 #define EVENT_REGISTER  1
 451 #define EVENT_PROCESS   2
 452
 453 struct filterops {
 454         int     f_isfd;         /* true if ident == filedescriptor */
 455         int     (*f_attach)(struct knote *kn);
 456         void    (*f_detach)(struct knote *kn);
 457         int     (*f_event)(struct knote *kn, long hint);
 458         /* Optional f_touch operation, called only if !f_isfd && non-NULL */
 459         void    (*f_touch)(struct knote *kn, struct kevent64_s *kev, long type);
 460         /* Optional f_peek operation, called only if KN_STAYQUEUED is set */
 461         unsigned (*f_peek)(struct knote *kn);
 462 };
 463
 464 struct proc;
 465 struct wait_queue;
 466
 467 SLIST_HEAD(klist, knote);
 468 extern void     knote_init(void);
 469 extern void     klist_init(struct klist *list);
 470
 471 #define KNOTE(list, hint)       knote(list, hint)
 472 #define KNOTE_ATTACH(list, kn)  knote_attach(list, kn)
 473 #define KNOTE_DETACH(list, kn)  knote_detach(list, kn)
 474
 475
 476 extern void     knote(struct klist *list, long hint);
 477 extern int      knote_attach(struct klist *list, struct knote *kn);
 478 extern int      knote_detach(struct klist *list, struct knote *kn);
 479 extern int      knote_link_wait_queue(struct knote *kn, struct wait_queue *wq, wait_queue_link_t wql);
 480 extern int      knote_unlink_wait_queue(struct knote *kn, struct wait_queue *wq, wait_queue_link_t *wqlp);
 481 extern void     knote_fdclose(struct proc *p, int fd);
 482 extern void     knote_markstayqueued(struct knote *kn);
 483 extern void     knote_clearstayqueued(struct knote *kn);
 484 #endif /* !KERNEL_PRIVATE */
 485
 486 #else   /* KERNEL */
 487
 488
 489 struct timespec;
 490
 491 __BEGIN_DECLS
 492 int     kqueue(void);
 493 int     kevent(int kq, const struct kevent *changelist, int nchanges,
 494                     struct kevent *eventlist, int nevents,
 495                     const struct timespec *timeout);
 496 int     kevent64(int kq, const struct kevent64_s *changelist,
 497                     int nchanges, struct kevent64_s *eventlist,
 498                     int nevents, unsigned int flags,
 499                     const struct timespec *timeout);
 500 __END_DECLS
 501
 502
 503 #endif /* KERNEL */
 504
 505
 506 #endif /* !_SYS_EVENT_H_ */