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/watchdog.h

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    1 /*-
    2  * Copyright (c) 2003 Poul-Henning Kamp
    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  * $FreeBSD$
   27  */
   28 #ifndef _SYS_WATCHDOG_H
   29 #define _SYS_WATCHDOG_H
   30 
   31 #include <sys/ioccom.h>
   32 
   33 #ifdef I_HAVE_TOTALLY_LOST_MY_SENSE_OF_HUMOUR
   34 #define _PATH_WATCHDOG  "watchdog"
   35 #else
   36 #define _PATH_WATCHDOG  "fido"
   37 #endif
   38 
   39 #define WDIOCPATPAT     _IOW('W', 42, u_int)
   40 
   41 #define WD_ACTIVE       0x8000000
   42         /* 
   43          * Watchdog reset, timeout set to value in WD_INTERVAL field.
   44          * The kernel will arm the watchdog and unless the userland
   45          * program calls WDIOCPATPAT again before the timer expires
   46          * the system will reinitialize.
   47          */
   48 
   49 #define WD_PASSIVE      0x0400000
   50         /*
   51          * Set the watchdog in passive mode.
   52          * The kernel will chose an appropriate timeout duration and
   53          * periodically reset the timer provided everything looks all
   54          * right to the kernel.
   55          */
   56 
   57 #define WD_INTERVAL     0x00000ff
   58         /*
   59          * Mask for duration bits.
   60          * The watchdog will have a nominal patience of 2^N * nanoseconds.
   61          * Example:  N == 30 gives a patience of 2^30 nanoseconds ~= 1 second.
   62          * NB: Expect variance in the +/- 10-20% range.
   63          */
   64 
   65 /* Handy macros for humans not used to power of two nanoseconds */
   66 #define WD_TO_NEVER     0
   67 #define WD_TO_1MS       20
   68 #define WD_TO_125MS     27
   69 #define WD_TO_250MS     28
   70 #define WD_TO_500MS     29
   71 #define WD_TO_1SEC      30
   72 #define WD_TO_2SEC      31
   73 #define WD_TO_4SEC      32
   74 #define WD_TO_8SEC      33
   75 #define WD_TO_16SEC     34
   76 #define WD_TO_32SEC     35
   77 
   78 #ifdef _KERNEL
   79 
   80 #include <sys/eventhandler.h>
   81 
   82 typedef void (*watchdog_fn)(void *, u_int, int *);
   83 
   84 EVENTHANDLER_DECLARE(watchdog_list, watchdog_fn);
   85 #endif
   86 
   87 #endif /* _SYS_WATCHDOG_H */

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