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/kernel.h

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    1 /*      $NetBSD: kernel.h,v 1.22 2003/10/02 12:14:00 christos Exp $     */
    2 
    3 /*-
    4  * Copyright (c) 1990, 1993
    5  *      The Regents of the University of California.  All rights reserved.
    6  * (c) UNIX System Laboratories, Inc.
    7  * All or some portions of this file are derived from material licensed
    8  * to the University of California by American Telephone and Telegraph
    9  * Co. or Unix System Laboratories, Inc. and are reproduced herein with
   10  * the permission of UNIX System Laboratories, Inc.
   11  *
   12  * Redistribution and use in source and binary forms, with or without
   13  * modification, are permitted provided that the following conditions
   14  * are met:
   15  * 1. Redistributions of source code must retain the above copyright
   16  *    notice, this list of conditions and the following disclaimer.
   17  * 2. Redistributions in binary form must reproduce the above copyright
   18  *    notice, this list of conditions and the following disclaimer in the
   19  *    documentation and/or other materials provided with the distribution.
   20  * 3. Neither the name of the University nor the names of its contributors
   21  *    may be used to endorse or promote products derived from this software
   22  *    without specific prior written permission.
   23  *
   24  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   25  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   26  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   27  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   28  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   29  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   30  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   31  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   32  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   33  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   34  * SUCH DAMAGE.
   35  *
   36  *      @(#)kernel.h    8.3 (Berkeley) 1/21/94
   37  */
   38 
   39 #ifndef _SYS_KERNEL_H_
   40 #define _SYS_KERNEL_H_
   41 
   42 #if defined(_KERNEL) || defined(_STANDALONE)
   43 /* Global variables for the kernel. */
   44 
   45 extern long hostid;
   46 extern char hostname[MAXHOSTNAMELEN];
   47 extern int hostnamelen;
   48 extern char domainname[MAXHOSTNAMELEN];
   49 extern int domainnamelen;
   50 
   51 extern volatile struct timeval mono_time;
   52 extern struct timeval boottime;
   53 extern volatile struct timeval time;
   54 
   55 extern int rtc_offset;          /* offset of rtc from UTC in minutes */
   56 
   57 extern int cold;                /* still working on startup */
   58 extern int tick;                /* usec per tick (1000000 / hz) */
   59 extern int hardclock_ticks;     /* # of hardclock ticks */
   60 extern int tickfix;             /* periodic tick adj. tick not integral */
   61 extern int tickfixinterval;     /* interval at which to apply adjustment */
   62 extern int tickadj;             /* "standard" clock skew, us./tick */
   63 extern int hz;                  /* system clock's frequency */
   64 extern int stathz;              /* statistics clock's frequency */
   65 extern int profhz;              /* profiling clock's frequency */
   66 extern int lbolt;               /* once a second sleep address */
   67 
   68 extern int profsrc;             /* profiling source */
   69 
   70 #define PROFSRC_CLOCK   0
   71 
   72 #endif
   73 
   74 #endif /* _SYS_KERNEL_H_ */

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