sys/sys/event.h

   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 1.5 2004/02/25 17:38:51 joerg Exp $
  28  */
  29
  30 #ifndef _SYS_EVENT_H_
  31 #define _SYS_EVENT_H_
  32
  33 #define EVFILT_READ             (-1)
  34 #define EVFILT_WRITE            (-2)
  35 #define EVFILT_AIO              (-3)    /* attached to aio requests */
  36 #define EVFILT_VNODE            (-4)    /* attached to vnodes */
  37 #define EVFILT_PROC             (-5)    /* attached to struct proc */
  38 #define EVFILT_SIGNAL           (-6)    /* attached to struct proc */
  39 #define EVFILT_TIMER            (-7)    /* timers */
  40
  41 #define EVFILT_SYSCOUNT         7
  42
  43 #define EV_SET(kevp_, a, b, c, d, e, f) do {    \
  44         struct kevent *kevp = (kevp_);          \
  45         (kevp)->ident = (a);                    \
  46         (kevp)->filter = (b);                   \
  47         (kevp)->flags = (c);                    \
  48         (kevp)->fflags = (d);                   \
  49         (kevp)->data = (e);                     \
  50         (kevp)->udata = (f);                    \
  51 } while(0)
  52
  53 struct kevent {
  54         uintptr_t       ident;          /* identifier for this event */
  55         short           filter;         /* filter for event */
  56         u_short         flags;
  57         u_int           fflags;
  58         intptr_t        data;
  59         void            *udata;         /* opaque user data identifier */
  60 };
  61
  62 /* actions */
  63 #define EV_ADD          0x0001          /* add event to kq (implies enable) */
  64 #define EV_DELETE       0x0002          /* delete event from kq */
  65 #define EV_ENABLE       0x0004          /* enable event */
  66 #define EV_DISABLE      0x0008          /* disable event (not reported) */
  67
  68 /* flags */
  69 #define EV_ONESHOT      0x0010          /* only report one occurrence */
  70 #define EV_CLEAR        0x0020          /* clear event state after reporting */
  71
  72 #define EV_SYSFLAGS     0xF000          /* reserved by system */
  73 #define EV_FLAG1        0x2000          /* filter-specific flag */
  74
  75 /* returned values */
  76 #define EV_EOF          0x8000          /* EOF detected */
  77 #define EV_ERROR        0x4000          /* error, data contains errno */
  78
  79 /*
  80  * data/hint flags for EVFILT_{READ|WRITE}, shared with userspace
  81  */
  82 #define NOTE_LOWAT      0x0001                  /* low water mark */
  83
  84 /*
  85  * data/hint flags for EVFILT_VNODE, shared with userspace
  86  */
  87 #define NOTE_DELETE     0x0001                  /* vnode was removed */
  88 #define NOTE_WRITE      0x0002                  /* data contents changed */
  89 #define NOTE_EXTEND     0x0004                  /* size increased */
  90 #define NOTE_ATTRIB     0x0008                  /* attributes changed */
  91 #define NOTE_LINK       0x0010                  /* link count changed */
  92 #define NOTE_RENAME     0x0020                  /* vnode was renamed */
  93 #define NOTE_REVOKE     0x0040                  /* vnode access was revoked */
  94
  95 /*
  96  * data/hint flags for EVFILT_PROC, shared with userspace
  97  */
  98 #define NOTE_EXIT       0x80000000              /* process exited */
  99 #define NOTE_FORK       0x40000000              /* process forked */
 100 #define NOTE_EXEC       0x20000000              /* process exec'd */
 101 #define NOTE_PCTRLMASK  0xf0000000              /* mask for hint bits */
 102 #define NOTE_PDATAMASK  0x000fffff              /* mask for pid */
 103
 104 /* additional flags for EVFILT_PROC */
 105 #define NOTE_TRACK      0x00000001              /* follow across forks */
 106 #define NOTE_TRACKERR   0x00000002              /* could not track child */
 107 #define NOTE_CHILD      0x00000004              /* am a child process */
 108
 109 /*
 110  * This is currently visible to userland to work around broken
 111  * programs which pull in <sys/proc.h> or <sys/select.h>.
 112  */
 113 #include <sys/queue.h>
 114 struct knote;
 115 SLIST_HEAD(klist, knote);
 116
 117 #ifdef _KERNEL
 118
 119 #ifdef MALLOC_DECLARE
 120 MALLOC_DECLARE(M_KQUEUE);
 121 #endif
 122
 123 #define KNOTE(list, hint)       if ((list) != NULL) knote(list, hint)
 124
 125 /*
 126  * Flag indicating hint is a signal.  Used by EVFILT_SIGNAL, and also
 127  * shared by EVFILT_PROC  (all knotes attached to p->p_klist)
 128  */
 129 #define NOTE_SIGNAL     0x08000000
 130
 131 struct filterops {
 132         int     f_isfd;         /* true if ident == filedescriptor */
 133         int     (*f_attach)     (struct knote *kn);
 134         void    (*f_detach)     (struct knote *kn);
 135         int     (*f_event)      (struct knote *kn, long hint);
 136 };
 137
 138 struct knote {
 139         SLIST_ENTRY(knote)      kn_link;        /* for fd */
 140         SLIST_ENTRY(knote)      kn_selnext;     /* for struct selinfo */
 141         TAILQ_ENTRY(knote)      kn_tqe;
 142         struct                  kqueue *kn_kq;  /* which queue we are on */
 143         struct                  kevent kn_kevent;
 144         int                     kn_status;
 145         int                     kn_sfflags;     /* saved filter flags */
 146         intptr_t                kn_sdata;       /* saved data field */
 147         union {
 148                 struct          file *p_fp;     /* file data pointer */
 149                 struct          proc *p_proc;   /* proc pointer */
 150         } kn_ptr;
 151         struct                  filterops *kn_fop;
 152         caddr_t                 kn_hook;
 153 #define KN_ACTIVE       0x01                    /* event has been triggered */
 154 #define KN_QUEUED       0x02                    /* event is on queue */
 155 #define KN_DISABLED     0x04                    /* event is disabled */
 156 #define KN_DETACHED     0x08                    /* knote is detached */
 157
 158 #define kn_id           kn_kevent.ident
 159 #define kn_filter       kn_kevent.filter
 160 #define kn_flags        kn_kevent.flags
 161 #define kn_fflags       kn_kevent.fflags
 162 #define kn_data         kn_kevent.data
 163 #define kn_fp           kn_ptr.p_fp
 164 };
 165
 166 struct proc;
 167 struct thread;
 168
 169 extern void     knote(struct klist *list, long hint);
 170 extern void     knote_remove(struct thread *td, struct klist *list);
 171 extern void     knote_fdclose(struct proc *p, int fd);
 172 extern int      kqueue_register(struct kqueue *kq,
 173                     struct kevent *kev, struct thread *td);
 174
 175 #else   /* !_KERNEL */
 176
 177 #include <sys/cdefs.h>
 178 struct timespec;
 179
 180 __BEGIN_DECLS
 181 int     kqueue (void);
 182 int     kevent (int, const struct kevent *, int, struct kevent *,
 183                 int, const struct timespec *);
 184 __END_DECLS
 185
 186 #endif /* !_KERNEL */
 187
 188 #endif /* !_SYS_EVENT_H_ */