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/* watchdog - start a watchdog timer with configurable kick frequencies
*
* Copyright 2019 Chris Sarra <chrissarra@google.com>
*
* See kernel.org/doc/Documentation/watchdog/watchdog-api.txt
USE_WATCHDOG(NEWTOY(watchdog, "<1>1Ft#=4<1T#=60<1", TOYFLAG_NEEDROOT|TOYFLAG_BIN))
config WATCHDOG
bool "watchdog"
default y
help
usage: watchdog [-F] [-t UPDATE] [-T DEADLINE] DEV
Start the watchdog timer at DEV with optional timeout parameters.
-F run in the foreground (do not daemonize)
-t poke watchdog every UPDATE seconds (default 4)
-T reboot if not poked for DEADLINE seconds (default 60)
*/
#define FOR_watchdog
#include "toys.h"
#include "linux/watchdog.h"
GLOBALS(
long T, t;
int fd;
)
static void safe_shutdown(int ignored)
{
write(TT.fd, "V", 1);
close(TT.fd);
error_exit("safely exited watchdog.");
}
void watchdog_main(void)
{
if (!FLAG(F)) xvdaemon();
xsignal(SIGTERM, safe_shutdown);
xsignal(SIGINT, safe_shutdown);
xioctl(TT.fd = xopen(*toys.optargs, O_WRONLY), WDIOC_SETTIMEOUT, &TT.T);
// Now that we've got the watchdog device open, kick it periodically.
for (;;) {
write(TT.fd, "", 1);
sleep(TT.t);
}
}
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