sys/sys/eventvar.h

   1 /*-
   2  * Copyright (c) 1999,2000 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/eventvar.h,v 1.1.2.2 2000/07/18 21:49:12 jlemon Exp $
  27  *      $DragonFly: src/sys/sys/eventvar.h,v 1.7 2007/01/15 01:26:56 dillon Exp $
  28  */
  29
  30 #ifndef _SYS_EVENTVAR_H_
  31 #define _SYS_EVENTVAR_H_
  32
  33 #if !defined(_KERNEL) && !defined(_KERNEL_STRUCTURES)
  34
  35 #error "This file should not be included by userland programs."
  36
  37 #else
  38
  39 #ifndef _SYS_QUEUE_H_
  40 #include <sys/queue.h>
  41 #endif
  42 #ifndef _SYS_EVENT_H_
  43 #include <sys/event.h>
  44 #endif
  45 #ifndef _SYS_SELINFO_H_
  46 #include <sys/selinfo.h>
  47 #endif
  48 #ifndef _SYS_FILEDESC_H_
  49 #include <sys/filedesc.h>
  50 #endif
  51
  52
  53 #define KQ_NEVENTS      8               /* minimize copy{in,out} calls */
  54 #define KQEXTENT        256             /* linear growth by this amount */
  55
  56 struct kqueue {
  57         TAILQ_HEAD(kqlist, knote) kq_head;      /* list of pending event */
  58         int             kq_count;               /* number of pending events */
  59         struct          sigio *kq_sigio;
  60         struct          selinfo kq_sel;
  61         struct          filedesc *kq_fdp;
  62         int             kq_state;
  63 #define KQ_SEL          0x01
  64 #define KQ_SLEEP        0x02
  65 #define KQ_ASYNC        0x04
  66         struct          kevent kq_kev[KQ_NEVENTS];
  67 };
  68
  69 #endif  /* _KERNEL */
  70 #endif  /* !_SYS_EVENTVAR_H_ */