Date: Thu, 27 Feb 2003 22:21:53 +0100 From: phk@phk.freebsd.dk To: current@freebsd.org Cc: soekris-tech@lists.soekris.com Subject: Re: cvs commit: src/sys/i386/i386 elan-mmcr.c Message-ID: <10830.1046380913@critter.freebsd.dk> In-Reply-To: Your message of "Thu, 27 Feb 2003 13:13:08 PST." <200302272113.h1RLD8CV051071@repoman.freebsd.org>
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In message <200302272113.h1RLD8CV051071@repoman.freebsd.org>, Poul-Henning Kamp
writes:
>phk 2003/02/27 13:13:08 PST
>
> Modified files:
> sys/i386/i386 elan-mmcr.c
> Log:
> Add support for the Elan CPU hardware watchdog used in "active" mode.
Now we can get the watchdog to kill the machine if it goes unresponsive.
(And no, I don't have an MFC plan, I don't have any Soekris' runing
-stable)
This is a small program which shows how to use the api. See also
the comments in <sys/watchdog.h> (also new file).
------------------------------------------------------------------------
#include <stdio.h>
#include <fcntl.h>
#include <errno.h>
#include <sys/types.h>
#include <sys/watchdog.h>
int
main(int argc, char **argv)
{
int fd;
int i, j;
unsigned u;
fd = open("/dev/elan-mmcr", O_RDWR);
if (fd < 0)
err(1, "/dev/elan-mmcr");
/*
* Set a two second timeout, but reset it after one second.
* Do this five times to see that it works as advertised.
*/
for (j = 0; j < 5; j++) {
u = WD_ACTIVE | WD_TO_2SEC;
i = ioctl(fd, WDIOCPATPAT, &u);
printf("2SEC %d %d\n", i, errno);
sleep (1);
}
/*
* Turn the watchdog off.
* Wait twice the previous timeout, we should survive.
*/
u = 0;
i = ioctl(fd, WDIOCPATPAT, &u);
printf("OFF %d %d\n", i, errno);
sleep (5);
/*
* Set a two second timeout, and let it, and us, expire.
*/
u = WD_ACTIVE | WD_TO_2SEC;
i = ioctl(fd, WDIOCPATPAT, &u);
printf("2SEC %d %d\n", i, errno);
sleep (5);
/*
* We shouldn't get here alive.
*/
printf("Where's the kaboom ?\n");
exit (0);
}
------------------------------------------------------------------------
--
Poul-Henning Kamp | UNIX since Zilog Zeus 3.20
phk@FreeBSD.ORG | TCP/IP since RFC 956
FreeBSD committer | BSD since 4.3-tahoe
Never attribute to malice what can adequately be explained by incompetence.
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