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 /*      $OpenBSD: event.h,v 1.13 2008/11/05 09:20:17 dlg Exp $  */
    2 
    3 /*-
    4  * Copyright (c) 1999,2000,2001 Jonathan Lemon <jlemon@FreeBSD.org>
    5  * All rights reserved.
    6  *
    7  * Redistribution and use in source and binary forms, with or without
    8  * modification, are permitted provided that the following conditions
    9  * are met:
   10  * 1. Redistributions of source code must retain the above copyright
   11  *    notice, this list of conditions and the following disclaimer.
   12  * 2. Redistributions in binary form must reproduce the above copyright
   13  *    notice, this list of conditions and the following disclaimer in the
   14  *    documentation and/or other materials provided with the distribution.
   15  *
   16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   17  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   18  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   19  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   20  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   21  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   22  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   23  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   24  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   25  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   26  * SUCH DAMAGE.
   27  *
   28  *      $FreeBSD: src/sys/sys/event.h,v 1.11 2001/02/24 01:41:31 jlemon Exp $
   29  */
   30 
   31 #ifndef _SYS_EVENT_H_
   32 #define _SYS_EVENT_H_
   33 
   34 #define EVFILT_READ             (-1)
   35 #define EVFILT_WRITE            (-2)
   36 #define EVFILT_AIO              (-3)    /* attached to aio requests */
   37 #define EVFILT_VNODE            (-4)    /* attached to vnodes */
   38 #define EVFILT_PROC             (-5)    /* attached to struct proc */
   39 #define EVFILT_SIGNAL           (-6)    /* attached to struct proc */
   40 #define EVFILT_TIMER            (-7)    /* timers */
   41 
   42 #define EVFILT_SYSCOUNT         7
   43 
   44 #define EV_SET(kevp, a, b, c, d, e, f) do {     \
   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         u_int           ident;          /* identifier for this event */
   55         short           filter;         /* filter for event */
   56         u_short         flags;
   57         u_int           fflags;
   58         int             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 #define NOTE_EOF        0x0002                  /* return on EOF */
   84 
   85 /*
   86  * data/hint flags for EVFILT_VNODE, shared with userspace
   87  */
   88 #define NOTE_DELETE     0x0001                  /* vnode was removed */
   89 #define NOTE_WRITE      0x0002                  /* data contents changed */
   90 #define NOTE_EXTEND     0x0004                  /* size increased */
   91 #define NOTE_ATTRIB     0x0008                  /* attributes changed */
   92 #define NOTE_LINK       0x0010                  /* link count changed */
   93 #define NOTE_RENAME     0x0020                  /* vnode was renamed */
   94 #define NOTE_REVOKE     0x0040                  /* vnode access was revoked */
   95 #define NOTE_TRUNCATE   0x0080                  /* vnode was truncated */
   96 
   97 /*
   98  * data/hint flags for EVFILT_PROC, shared with userspace
   99  */
  100 #define NOTE_EXIT       0x80000000              /* process exited */
  101 #define NOTE_FORK       0x40000000              /* process forked */
  102 #define NOTE_EXEC       0x20000000              /* process exec'd */
  103 #define NOTE_PCTRLMASK  0xf0000000              /* mask for hint bits */
  104 #define NOTE_PDATAMASK  0x000fffff              /* mask for pid */
  105 
  106 /* additional flags for EVFILT_PROC */
  107 #define NOTE_TRACK      0x00000001              /* follow across forks */
  108 #define NOTE_TRACKERR   0x00000002              /* could not track child */
  109 #define NOTE_CHILD      0x00000004              /* am a child process */
  110 
  111 /*
  112  * This is currently visible to userland to work around broken
  113  * programs which pull in <sys/proc.h> or <sys/selinfo.h>.
  114  */
  115 #include <sys/queue.h>
  116 struct knote;
  117 SLIST_HEAD(klist, knote);
  118 
  119 #ifdef _KERNEL
  120 
  121 #define KNOTE(list, hint)       do { \
  122                                         if ((list) != NULL) \
  123                                                 knote((list), (hint)); \
  124                                 } while (0)
  125 
  126 /*
  127  * Flag indicating hint is a signal.  Used by EVFILT_SIGNAL, and also
  128  * shared by EVFILT_PROC  (all knotes attached to p->p_klist)
  129  */
  130 #define NOTE_SIGNAL     0x08000000
  131 
  132 struct filterops {
  133         int     f_isfd;         /* true if ident == filedescriptor */
  134         int     (*f_attach)(struct knote *kn);
  135         void    (*f_detach)(struct knote *kn);
  136         int     (*f_event)(struct knote *kn, long hint);
  137 };
  138 
  139 struct knote {
  140         SLIST_ENTRY(knote)      kn_link;        /* for fd */
  141         SLIST_ENTRY(knote)      kn_selnext;     /* for struct selinfo */
  142         TAILQ_ENTRY(knote)      kn_tqe;
  143         struct                  kqueue *kn_kq;  /* which queue we are on */
  144         struct                  kevent kn_kevent;
  145         int                     kn_status;
  146         int                     kn_sfflags;     /* saved filter flags */
  147         int                     kn_sdata;       /* saved data field */
  148         union {
  149                 struct          file *p_fp;     /* file data pointer */
  150                 struct          proc *p_proc;   /* proc pointer */
  151         } kn_ptr;
  152         const struct            filterops *kn_fop;
  153         void                    *kn_hook;
  154 #define KN_ACTIVE       0x01                    /* event has been triggered */
  155 #define KN_QUEUED       0x02                    /* event is on queue */
  156 #define KN_DISABLED     0x04                    /* event is disabled */
  157 #define KN_DETACHED     0x08                    /* knote is detached */
  158 
  159 #define kn_id           kn_kevent.ident
  160 #define kn_filter       kn_kevent.filter
  161 #define kn_flags        kn_kevent.flags
  162 #define kn_fflags       kn_kevent.fflags
  163 #define kn_data         kn_kevent.data
  164 #define kn_fp           kn_ptr.p_fp
  165 };
  166 
  167 struct proc;
  168 
  169 extern void     knote(struct klist *list, long hint);
  170 extern void     knote_remove(struct proc *p, 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 proc *p);
  174 extern int      filt_seltrue(struct knote *kn, long hint);
  175 extern void     klist_invalidate(struct klist *);
  176 
  177 #else   /* !_KERNEL */
  178 
  179 #include <sys/cdefs.h>
  180 struct timespec;
  181 
  182 __BEGIN_DECLS
  183 int     kqueue(void);
  184 int     kevent(int kq, const struct kevent *changelist, int nchanges,
  185                     struct kevent *eventlist, int nevents,
  186                     const struct timespec *timeout);
  187 __END_DECLS
  188 
  189 #endif /* !_KERNEL */
  190 
  191 #endif /* !_SYS_EVENT_H_ */

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