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: releng/5.1/sys/sys/event.h 110241 2003-02-02 19:39:51Z 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 #define EVFILT_NETDEV           (-8)    /* network devices */
   40 
   41 #define EVFILT_SYSCOUNT         8
   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  * data/hint flags for EVFILT_NETDEV, shared with userspace
  111  */
  112 #define NOTE_LINKUP     0x0001                  /* link is up */
  113 #define NOTE_LINKDOWN   0x0002                  /* link is down */
  114 #define NOTE_LINKINV    0x0004                  /* link state is invalid */
  115 
  116 /*
  117  * This is currently visible to userland to work around broken
  118  * programs which pull in <sys/proc.h>.
  119  */
  120 #include <sys/queue.h> 
  121 struct knote;
  122 SLIST_HEAD(klist, knote);
  123 
  124 #ifdef _KERNEL
  125 
  126 #ifdef MALLOC_DECLARE
  127 MALLOC_DECLARE(M_KQUEUE);
  128 #endif
  129 
  130 #define KNOTE(list, hint)       if ((list) != NULL) knote(list, hint)
  131 
  132 /*
  133  * Flag indicating hint is a signal.  Used by EVFILT_SIGNAL, and also
  134  * shared by EVFILT_PROC  (all knotes attached to p->p_klist)
  135  */
  136 #define NOTE_SIGNAL     0x08000000
  137 
  138 struct filterops {
  139         int     f_isfd;         /* true if ident == filedescriptor */
  140         int     (*f_attach)(struct knote *kn);
  141         void    (*f_detach)(struct knote *kn);
  142         int     (*f_event)(struct knote *kn, long hint);
  143 };
  144 
  145 struct knote {
  146         SLIST_ENTRY(knote)      kn_link;        /* for fd */
  147         SLIST_ENTRY(knote)      kn_selnext;     /* for struct selinfo */
  148         TAILQ_ENTRY(knote)      kn_tqe;
  149         struct                  kqueue *kn_kq;  /* which queue we are on */
  150         struct                  kevent kn_kevent;
  151         int                     kn_status;
  152         int                     kn_sfflags;     /* saved filter flags */
  153         intptr_t                kn_sdata;       /* saved data field */
  154         union {
  155                 struct          file *p_fp;     /* file data pointer */
  156                 struct          proc *p_proc;   /* proc pointer */
  157         } kn_ptr;
  158         struct                  filterops *kn_fop;
  159         void                    *kn_hook;
  160 #define KN_ACTIVE       0x01                    /* event has been triggered */
  161 #define KN_QUEUED       0x02                    /* event is on queue */
  162 #define KN_DISABLED     0x04                    /* event is disabled */
  163 #define KN_DETACHED     0x08                    /* knote is detached */
  164 
  165 #define kn_id           kn_kevent.ident
  166 #define kn_filter       kn_kevent.filter
  167 #define kn_flags        kn_kevent.flags
  168 #define kn_fflags       kn_kevent.fflags
  169 #define kn_data         kn_kevent.data
  170 #define kn_fp           kn_ptr.p_fp
  171 };
  172 
  173 struct thread;
  174 struct proc;
  175 
  176 extern void     knote(struct klist *list, long hint);
  177 extern void     knote_remove(struct thread *p, struct klist *list);
  178 extern void     knote_fdclose(struct thread *p, int fd);
  179 extern int      kqueue_register(struct kqueue *kq,
  180                     struct kevent *kev, struct thread *p);
  181 extern int      kqueue_add_filteropts(int filt, struct filterops *filtops);
  182 extern int      kqueue_del_filteropts(int filt);
  183 
  184 #else   /* !_KERNEL */
  185 
  186 #include <sys/cdefs.h>
  187 struct timespec;
  188 
  189 __BEGIN_DECLS
  190 int     kqueue(void);
  191 int     kevent(int kq, const struct kevent *changelist, int nchanges,
  192             struct kevent *eventlist, int nevents,
  193             const struct timespec *timeout);
  194 __END_DECLS
  195 
  196 #endif /* !_KERNEL */
  197 
  198 #endif /* !_SYS_EVENT_H_ */

Cache object: 8d98331fe4bd1f81d007ab27fce61f53


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