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/wdog.h

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    1 /*      $NetBSD: wdog.h,v 1.1 2000/11/04 18:33:33 thorpej Exp $ */
    2 
    3 /*-
    4  * Copyright (c) 2000 Zembu Labs, Inc.
    5  * All rights reserved.
    6  *
    7  * Author: Jason R. Thorpe <thorpej@zembu.com>
    8  *
    9  * Redistribution and use in source and binary forms, with or without
   10  * modification, are permitted provided that the following conditions
   11  * are met:
   12  * 1. Redistributions of source code must retain the above copyright
   13  *    notice, this list of conditions and the following disclaimer.
   14  * 2. Redistributions in binary form must reproduce the above copyright
   15  *    notice, this list of conditions and the following disclaimer in the
   16  *    documentation and/or other materials provided with the distribution.
   17  * 3. All advertising materials mentioning features or use of this software
   18  *    must display the following acknowledgement:
   19  *      This product includes software developed by Zembu Labs, Inc.
   20  * 4. Neither the name of Zembu Labs nor the names of its employees may
   21  *    be used to endorse or promote products derived from this software
   22  *    without specific prior written permission.
   23  *
   24  * THIS SOFTWARE IS PROVIDED BY ZEMBU LABS, INC. ``AS IS'' AND ANY EXPRESS
   25  * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WAR-
   26  * RANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DIS-
   27  * CLAIMED.  IN NO EVENT SHALL ZEMBU LABS BE LIABLE FOR ANY DIRECT, INDIRECT,
   28  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
   29  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
   30  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
   31  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   32  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
   33  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   34  */
   35 
   36 #ifndef _SYS_WDOG_H_
   37 #define _SYS_WDOG_H_
   38 
   39 #include <sys/ioccom.h>
   40 
   41 /*
   42  * Definitions for manipulating watchdog timers.
   43  */
   44 
   45 /* This must match struct device's "dv_xname" size. */
   46 #define WDOG_NAMESIZE   16
   47 
   48 struct wdog_mode {
   49         char wm_name[WDOG_NAMESIZE];
   50         int wm_mode;            /* timer mode */
   51         u_int wm_period;        /* timer period (seconds) */
   52 };
   53 
   54 /*
   55  * GMODE -- get mode of watchdog specified by wm_name.
   56  *
   57  * SMODE -- set mode of watchdog specified by wm_mame.  If
   58  *          wm_mode is not DISARMED, the watchdog is armed,
   59  *          if another watchdog is not already running.
   60  */
   61 #define WDOGIOC_GMODE           _IOWR('w', 0, struct wdog_mode)
   62 #define WDOGIOC_SMODE            _IOW('w', 1, struct wdog_mode)
   63 
   64 /*
   65  * WHICH -- returns the mode information of the currently armed
   66  *          watchdog timer.
   67  */
   68 #define WDOGIOC_WHICH            _IOR('w', 2, struct wdog_mode)
   69 
   70 /*
   71  * TICKLE -- tickle the currently armed watchdog timer if the
   72  *           mode of that timer is UTICKLE.
   73  */
   74 #define WDOGIOC_TICKLE            _IO('w', 3)
   75 
   76 /*
   77  * GTICKLER -- get the PID of the last process to tickle the timer.
   78  */
   79 #define WDOGIOC_GTICKLER         _IOR('w', 4, pid_t)
   80 
   81 /*
   82  * GWDOGS -- fill in the character array with the names of all of
   83  *           the watchdog timers present on the system.  The names
   84  *           will be padded out to WDOG_NAMESIZE.  Thus, the argument
   85  *           should be (count * WDOG_NAMESIZE) bytes long.
   86  */
   87 struct wdog_conf {
   88         char *wc_names;
   89         int wc_count;
   90 };
   91 #define WDOGIOC_GWDOGS          _IOWR('w', 5, struct wdog_conf)
   92 
   93 #define WDOG_MODE_DISARMED      0       /* watchdog is disarmed */
   94 #define WDOG_MODE_KTICKLE       1       /* kernel tickles watchdog */
   95 #define WDOG_MODE_UTICKLE       2       /* user tickles watchdog */
   96 
   97 #define WDOG_MODE_MASK          0x03
   98 
   99 #define WDOG_FEATURE_ALARM      0x10    /* enable audible alarm on expire */
  100 
  101 #define WDOG_FEATURE_MASK       0x10
  102 
  103 #define WDOG_PERIOD_DEFAULT     ((u_int)-1)
  104 
  105 /* Period is expressed in seconds. */
  106 #define WDOG_PERIOD_TO_TICKS(period)    ((period) * hz)
  107 
  108 #endif /* _SYS_WDOG_H_ */

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