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