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/eventvar.h

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    1 /*      $OpenBSD: eventvar.h,v 1.2 2000/11/16 20:31:30 mickey Exp $     */
    2 
    3 /*-
    4  * Copyright (c) 1999,2000 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/eventvar.h,v 1.3 2000/05/26 02:06:54 jake Exp $
   29  */
   30 
   31 #ifndef _SYS_EVENTVAR_H_
   32 #define _SYS_EVENTVAR_H_
   33 
   34 #define KQ_NEVENTS      8               /* minimize copy{in,out} calls */
   35 #define KQEXTENT        256             /* linear growth by this amount */
   36 
   37 struct kqueue {
   38         TAILQ_HEAD(kqlist, knote) kq_head;      /* list of pending event */
   39         int             kq_count;               /* number of pending events */
   40         struct          selinfo kq_sel;
   41         struct          filedesc *kq_fdp;
   42         int             kq_state;
   43 #define KQ_SEL          0x01
   44 #define KQ_SLEEP        0x02
   45         struct          kevent kq_kev[KQ_NEVENTS];
   46 };
   47 
   48 #endif /* !_SYS_EVENTVAR_H_ */

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