2 * Copyright (c) 2003 Poul-Henning Kamp
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
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9 * notice, this list of conditions and the following disclaimer.
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14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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28 #ifndef _SYS_WATCHDOG_H
29 #define _SYS_WATCHDOG_H
31 #include <sys/ioccom.h>
33 #define _PATH_WATCHDOG "fido"
35 #define WDIOCPATPAT _IOW('W', 42, u_int)
37 #define WD_ACTIVE 0x8000000
39 * Watchdog reset, timeout set to value in WD_INTERVAL field.
40 * The kernel will arm the watchdog and unless the userland
41 * program calls WDIOCPATPAT again before the timer expires
42 * the system will reinitialize.
45 #define WD_PASSIVE 0x0400000
47 * Set the watchdog in passive mode.
48 * The kernel will chose an appropriate timeout duration and
49 * periodically reset the timer provided everything looks all
50 * right to the kernel.
53 #define WD_LASTVAL 0x0200000
55 * Use the already last used timeout value.
56 * The kernel will use as timeout the last valid timeout provided.
59 #define WD_INTERVAL 0x00000ff
61 * Mask for duration bits.
62 * The watchdog will have a nominal patience of 2^N * nanoseconds.
63 * Example: N == 30 gives a patience of 2^30 nanoseconds ~= 1 second.
64 * NB: Expect variance in the +/- 10-20% range.
67 /* Handy macros for humans not used to power of two nanoseconds */
70 #define WD_TO_125MS 27
71 #define WD_TO_250MS 28
72 #define WD_TO_500MS 29
77 #define WD_TO_16SEC 34
78 #define WD_TO_32SEC 35
82 #include <sys/eventhandler.h>
84 typedef void (*watchdog_fn)(void *, u_int, int *);
86 EVENTHANDLER_DECLARE(watchdog_list, watchdog_fn);
88 u_int wdog_kern_last_timeout(void);
89 int wdog_kern_pat(u_int utim);
92 #endif /* _SYS_WATCHDOG_H */