The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/sys/event.h

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    1 /*      $NetBSD: event.h,v 1.15 2005/02/26 22:25:34 perry Exp $ */
    2 /*-
    3  * Copyright (c) 1999,2000,2001 Jonathan Lemon <jlemon@FreeBSD.org>
    4  * All rights reserved.
    5  *
    6  * Redistribution and use in source and binary forms, with or without
    7  * modification, are permitted provided that the following conditions
    8  * are met:
    9  * 1. Redistributions of source code must retain the above copyright
   10  *    notice, this list of conditions and the following disclaimer.
   11  * 2. Redistributions in binary form must reproduce the above copyright
   12  *    notice, this list of conditions and the following disclaimer in the
   13  *    documentation and/or other materials provided with the distribution.
   14  *
   15  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   16  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   17  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   18  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   19  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   20  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   21  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   22  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   23  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   24  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   25  * SUCH DAMAGE.
   26  *
   27  *      $FreeBSD: src/sys/sys/event.h,v 1.12 2001/02/24 01:44:03 jlemon Exp $
   28  */
   29 
   30 #ifndef _SYS_EVENT_H_
   31 #define _SYS_EVENT_H_
   32 
   33 #include <sys/featuretest.h>
   34 #include <sys/types.h>                  /* for size_t */
   35 #include <sys/inttypes.h>               /* for uintptr_t */
   36 #include <sys/null.h>                   /* for NULL */
   37 
   38 #define EVFILT_READ             0
   39 #define EVFILT_WRITE            1
   40 #define EVFILT_AIO              2       /* attached to aio requests */
   41 #define EVFILT_VNODE            3       /* attached to vnodes */
   42 #define EVFILT_PROC             4       /* attached to struct proc */
   43 #define EVFILT_SIGNAL           5       /* attached to struct proc */
   44 #define EVFILT_TIMER            6       /* arbitrary timer (in ms) */
   45 #define EVFILT_SYSCOUNT         7       /* number of filters */
   46 
   47 #define EV_SET(kevp, a, b, c, d, e, f)                                  \
   48 do {                                                                    \
   49         (kevp)->ident = (a);                                            \
   50         (kevp)->filter = (b);                                           \
   51         (kevp)->flags = (c);                                            \
   52         (kevp)->fflags = (d);                                           \
   53         (kevp)->data = (e);                                             \
   54         (kevp)->udata = (f);                                            \
   55 } while (/* CONSTCOND */ 0)
   56 
   57 
   58 struct kevent {
   59         uintptr_t       ident;          /* identifier for this event */
   60         uint32_t        filter;         /* filter for event */
   61         uint32_t        flags;          /* action flags for kqueue */
   62         uint32_t        fflags;         /* filter flag value */
   63         int64_t         data;           /* filter data value */
   64         intptr_t        udata;          /* opaque user data identifier */
   65 };
   66 
   67 /* actions */
   68 #define EV_ADD          0x0001          /* add event to kq (implies ENABLE) */
   69 #define EV_DELETE       0x0002          /* delete event from kq */
   70 #define EV_ENABLE       0x0004          /* enable event */
   71 #define EV_DISABLE      0x0008          /* disable event (not reported) */
   72 
   73 /* flags */
   74 #define EV_ONESHOT      0x0010          /* only report one occurrence */
   75 #define EV_CLEAR        0x0020          /* clear event state after reporting */
   76 
   77 #define EV_SYSFLAGS     0xF000          /* reserved by system */
   78 #define EV_FLAG1        0x2000          /* filter-specific flag */
   79 
   80 /* returned values */
   81 #define EV_EOF          0x8000          /* EOF detected */
   82 #define EV_ERROR        0x4000          /* error, data contains errno */
   83 
   84 /*
   85  * hint flag for in-kernel use - must not equal any existing note
   86  */
   87 #ifdef _KERNEL
   88 #define NOTE_SUBMIT     0x01000000              /* initial knote submission */
   89 #endif
   90 /*
   91  * data/hint flags for EVFILT_{READ|WRITE}, shared with userspace
   92  */
   93 #define NOTE_LOWAT      0x0001                  /* low water mark */
   94 
   95 /*
   96  * data/hint flags for EVFILT_VNODE, shared with userspace
   97  */
   98 #define NOTE_DELETE     0x0001                  /* vnode was removed */
   99 #define NOTE_WRITE      0x0002                  /* data contents changed */
  100 #define NOTE_EXTEND     0x0004                  /* size increased */
  101 #define NOTE_ATTRIB     0x0008                  /* attributes changed */
  102 #define NOTE_LINK       0x0010                  /* link count changed */
  103 #define NOTE_RENAME     0x0020                  /* vnode was renamed */
  104 #define NOTE_REVOKE     0x0040                  /* vnode access was revoked */
  105 
  106 /*
  107  * data/hint flags for EVFILT_PROC, shared with userspace
  108  */
  109 #define NOTE_EXIT       0x80000000              /* process exited */
  110 #define NOTE_FORK       0x40000000              /* process forked */
  111 #define NOTE_EXEC       0x20000000              /* process exec'd */
  112 #define NOTE_PCTRLMASK  0xf0000000              /* mask for hint bits */
  113 #define NOTE_PDATAMASK  0x000fffff              /* mask for pid */
  114 
  115 /* additional flags for EVFILT_PROC */
  116 #define NOTE_TRACK      0x00000001              /* follow across forks */
  117 #define NOTE_TRACKERR   0x00000002              /* could not track child */
  118 #define NOTE_CHILD      0x00000004              /* am a child process */
  119 
  120 /*
  121  * This is currently visible to userland to work around broken
  122  * programs which pull in <sys/proc.h> or <sys/select.h>.
  123  */
  124 #include <sys/queue.h>
  125 struct knote;
  126 SLIST_HEAD(klist, knote);
  127 
  128 
  129 /*
  130  * ioctl(2)s supported on kqueue descriptors.
  131  */
  132 #include <sys/ioctl.h>
  133 
  134 struct kfilter_mapping {
  135         char            *name;          /* name to lookup or return */
  136         size_t          len;            /* length of name */
  137         uint32_t        filter;         /* filter to lookup or return */
  138 };
  139 
  140 /* map filter to name (max size len) */
  141 #define KFILTER_BYFILTER        _IOWR('k', 0, struct kfilter_mapping)
  142 /* map name to filter (len ignored) */
  143 #define KFILTER_BYNAME          _IOWR('k', 1, struct kfilter_mapping)
  144 
  145 #ifdef _KERNEL
  146 #include <sys/mallocvar.h>              /* for malloc types */
  147 
  148 MALLOC_DECLARE(M_KEVENT);
  149 
  150 #define KNOTE(list, hint)       if (!SLIST_EMPTY(list)) knote(list, hint)
  151 
  152 /*
  153  * Flag indicating hint is a signal.  Used by EVFILT_SIGNAL, and also
  154  * shared by EVFILT_PROC  (all knotes attached to p->p_klist)
  155  */
  156 #define NOTE_SIGNAL     0x08000000
  157 
  158 /*
  159  * Callback methods for each filter type.
  160  */
  161 struct filterops {
  162         int     f_isfd;                 /* true if ident == filedescriptor */
  163         int     (*f_attach)     (struct knote *);
  164                                         /* called when knote is ADDed */
  165         void    (*f_detach)     (struct knote *);
  166                                         /* called when knote is DELETEd */
  167         int     (*f_event)      (struct knote *, long);
  168                                         /* called when event is triggered */
  169 };
  170 
  171 struct knote {
  172         SLIST_ENTRY(knote)      kn_link;        /* for fd */
  173         SLIST_ENTRY(knote)      kn_selnext;     /* for struct selinfo */
  174         TAILQ_ENTRY(knote)      kn_tqe;
  175         struct kqueue           *kn_kq;         /* which queue we are on */
  176         struct kevent           kn_kevent;
  177         uint32_t                kn_status;
  178         uint32_t                kn_sfflags;     /* saved filter flags */
  179         uintptr_t               kn_sdata;       /* saved data field */
  180         union {
  181                 struct file     *p_fp;          /* file data pointer */
  182                 struct proc     *p_proc;        /* proc pointer */
  183                 void            *p_opaque;      /* opaque/misc pointer */
  184         } kn_ptr;
  185         const struct filterops  *kn_fop;
  186         void                    *kn_hook;
  187 
  188 #define KN_ACTIVE       0x01                    /* event has been triggered */
  189 #define KN_QUEUED       0x02                    /* event is on queue */
  190 #define KN_DISABLED     0x04                    /* event is disabled */
  191 #define KN_DETACHED     0x08                    /* knote is detached */
  192 
  193 #define kn_id           kn_kevent.ident
  194 #define kn_filter       kn_kevent.filter
  195 #define kn_flags        kn_kevent.flags
  196 #define kn_fflags       kn_kevent.fflags
  197 #define kn_data         kn_kevent.data
  198 #define kn_fp           kn_ptr.p_fp
  199 };
  200 
  201 struct proc;
  202 
  203 void    knote(struct klist *, long);
  204 void    knote_remove(struct proc *, struct klist *);
  205 void    knote_fdclose(struct proc *, int);
  206 int     kqueue_register(struct kqueue *, struct kevent *, struct proc *);
  207 
  208 int     kfilter_register(const char *, const struct filterops *, int *);
  209 int     kfilter_unregister(const char *);
  210 
  211 int     filt_seltrue(struct knote *, long);
  212 int     seltrue_kqfilter(dev_t, struct knote *);
  213 
  214 #else   /* !_KERNEL */
  215 
  216 #include <sys/cdefs.h>
  217 struct timespec;
  218 
  219 __BEGIN_DECLS
  220 #if defined(_NETBSD_SOURCE)
  221 int     kqueue(void);
  222 int     kevent(int, const struct kevent *, size_t, struct kevent *, size_t,
  223                     const struct timespec *);
  224 #endif /* !_POSIX_C_SOURCE */
  225 __END_DECLS
  226 
  227 #endif /* !_KERNEL */
  228 
  229 #endif /* !_SYS_EVENT_H_ */

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