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 /*-
    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: stable/4/sys/sys/event.h 110591 2003-02-09 15:28:13Z nectar $
   27  */
   28 
   29 #ifndef _SYS_EVENT_H_
   30 #define _SYS_EVENT_H_
   31 
   32 #define EVFILT_READ             (-1)
   33 #define EVFILT_WRITE            (-2)
   34 #define EVFILT_AIO              (-3)    /* attached to aio requests */
   35 #define EVFILT_VNODE            (-4)    /* attached to vnodes */
   36 #define EVFILT_PROC             (-5)    /* attached to struct proc */
   37 #define EVFILT_SIGNAL           (-6)    /* attached to struct proc */
   38 #define EVFILT_TIMER            (-7)    /* timers */
   39 
   40 #define EVFILT_SYSCOUNT         7
   41 
   42 #define EV_SET(kevp_, a, b, c, d, e, f) do {    \
   43         struct kevent *kevp = (kevp_);          \
   44         (kevp)->ident = (a);                    \
   45         (kevp)->filter = (b);                   \
   46         (kevp)->flags = (c);                    \
   47         (kevp)->fflags = (d);                   \
   48         (kevp)->data = (e);                     \
   49         (kevp)->udata = (f);                    \
   50 } while(0)
   51 
   52 struct kevent {
   53         uintptr_t       ident;          /* identifier for this event */
   54         short           filter;         /* filter for event */
   55         u_short         flags;
   56         u_int           fflags;
   57         intptr_t        data;
   58         void            *udata;         /* opaque user data identifier */
   59 };
   60 
   61 /* actions */
   62 #define EV_ADD          0x0001          /* add event to kq (implies enable) */
   63 #define EV_DELETE       0x0002          /* delete event from kq */
   64 #define EV_ENABLE       0x0004          /* enable event */
   65 #define EV_DISABLE      0x0008          /* disable event (not reported) */
   66 
   67 /* flags */
   68 #define EV_ONESHOT      0x0010          /* only report one occurrence */
   69 #define EV_CLEAR        0x0020          /* clear event state after reporting */
   70 
   71 #define EV_SYSFLAGS     0xF000          /* reserved by system */
   72 #define EV_FLAG1        0x2000          /* filter-specific flag */
   73 
   74 /* returned values */
   75 #define EV_EOF          0x8000          /* EOF detected */
   76 #define EV_ERROR        0x4000          /* error, data contains errno */
   77 
   78 /*
   79  * data/hint flags for EVFILT_{READ|WRITE}, shared with userspace
   80  */
   81 #define NOTE_LOWAT      0x0001                  /* low water mark */
   82 
   83 /*
   84  * data/hint flags for EVFILT_VNODE, shared with userspace
   85  */
   86 #define NOTE_DELETE     0x0001                  /* vnode was removed */
   87 #define NOTE_WRITE      0x0002                  /* data contents changed */
   88 #define NOTE_EXTEND     0x0004                  /* size increased */
   89 #define NOTE_ATTRIB     0x0008                  /* attributes changed */
   90 #define NOTE_LINK       0x0010                  /* link count changed */
   91 #define NOTE_RENAME     0x0020                  /* vnode was renamed */
   92 #define NOTE_REVOKE     0x0040                  /* vnode access was revoked */
   93 
   94 /*
   95  * data/hint flags for EVFILT_PROC, shared with userspace
   96  */
   97 #define NOTE_EXIT       0x80000000              /* process exited */
   98 #define NOTE_FORK       0x40000000              /* process forked */
   99 #define NOTE_EXEC       0x20000000              /* process exec'd */
  100 #define NOTE_PCTRLMASK  0xf0000000              /* mask for hint bits */
  101 #define NOTE_PDATAMASK  0x000fffff              /* mask for pid */
  102 
  103 /* additional flags for EVFILT_PROC */
  104 #define NOTE_TRACK      0x00000001              /* follow across forks */
  105 #define NOTE_TRACKERR   0x00000002              /* could not track child */
  106 #define NOTE_CHILD      0x00000004              /* am a child process */
  107 
  108 /*
  109  * This is currently visible to userland to work around broken
  110  * programs which pull in <sys/proc.h> or <sys/select.h>.
  111  */
  112 #include <sys/queue.h> 
  113 struct knote;
  114 SLIST_HEAD(klist, knote);
  115 
  116 #ifdef _KERNEL
  117 
  118 #ifdef MALLOC_DECLARE
  119 MALLOC_DECLARE(M_KQUEUE);
  120 #endif
  121 
  122 #define KNOTE(list, hint)       if ((list) != NULL) knote(list, hint)
  123 
  124 /*
  125  * Flag indicating hint is a signal.  Used by EVFILT_SIGNAL, and also
  126  * shared by EVFILT_PROC  (all knotes attached to p->p_klist)
  127  */
  128 #define NOTE_SIGNAL     0x08000000
  129 
  130 struct filterops {
  131         int     f_isfd;         /* true if ident == filedescriptor */
  132         int     (*f_attach)     __P((struct knote *kn));
  133         void    (*f_detach)     __P((struct knote *kn));
  134         int     (*f_event)      __P((struct knote *kn, long hint));
  135 };
  136 
  137 struct knote {
  138         SLIST_ENTRY(knote)      kn_link;        /* for fd */
  139         SLIST_ENTRY(knote)      kn_selnext;     /* for struct selinfo */
  140         TAILQ_ENTRY(knote)      kn_tqe;
  141         struct                  kqueue *kn_kq;  /* which queue we are on */
  142         struct                  kevent kn_kevent;
  143         int                     kn_status;
  144         int                     kn_sfflags;     /* saved filter flags */
  145         intptr_t                kn_sdata;       /* saved data field */
  146         union {
  147                 struct          file *p_fp;     /* file data pointer */
  148                 struct          proc *p_proc;   /* proc pointer */
  149         } kn_ptr;
  150         struct                  filterops *kn_fop;
  151         caddr_t                 kn_hook;
  152 #define KN_ACTIVE       0x01                    /* event has been triggered */
  153 #define KN_QUEUED       0x02                    /* event is on queue */
  154 #define KN_DISABLED     0x04                    /* event is disabled */
  155 #define KN_DETACHED     0x08                    /* knote is detached */
  156 
  157 #define kn_id           kn_kevent.ident
  158 #define kn_filter       kn_kevent.filter
  159 #define kn_flags        kn_kevent.flags
  160 #define kn_fflags       kn_kevent.fflags
  161 #define kn_data         kn_kevent.data
  162 #define kn_fp           kn_ptr.p_fp
  163 };
  164 
  165 struct proc;
  166 
  167 extern void     knote(struct klist *list, long hint);
  168 extern void     knote_remove(struct proc *p, struct klist *list);
  169 extern void     knote_fdclose(struct proc *p, int fd);
  170 extern int      kqueue_register(struct kqueue *kq,
  171                     struct kevent *kev, struct proc *p);
  172 
  173 #else   /* !_KERNEL */
  174 
  175 #include <sys/cdefs.h>
  176 struct timespec;
  177 
  178 __BEGIN_DECLS
  179 int     kqueue __P((void));
  180 int     kevent __P((int kq, const struct kevent *changelist, int nchanges,
  181                     struct kevent *eventlist, int nevents,
  182                     const struct timespec *timeout));
  183 __END_DECLS
  184 
  185 #endif /* !_KERNEL */
  186 
  187 #endif /* !_SYS_EVENT_H_ */

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