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#include <u.h>
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#include <libc.h>
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static int wdog;
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int
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procctl(int pid)
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{
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	int ctlfd;
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	char *ctl;
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	ctl = smprint("/proc/%d/ctl", pid);
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	ctlfd = open(ctl, OWRITE);
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	if (ctlfd < 0)
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		sysfatal("open %s: %r", ctl);
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	free(ctl);
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	return ctlfd;
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}
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void
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main(int, char **)
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{
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	int ctl;
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	wdog = open("#w/wdctl", ORDWR);
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	if (wdog < 0)
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		sysfatal("open #w/wdctl: %r");
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	switch(rfork(RFPROC|RFNOWAIT|RFFDG)){
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	case 0:
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		break;
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	default:
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		exits(0);
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	}
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	ctl = procctl(getpid());
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	fprint(ctl, "pri 18");
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	close(ctl);
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	if (fprint(wdog, "enable") < 0)
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		sysfatal("write #w/wdctl enable: %r");
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	for(;;){
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		sleep(300);		/* allows 4.2GHz CPU, with some slop */
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		seek(wdog, 0, 0);
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		if (fprint(wdog, "restart") < 0)
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			sysfatal("write #w/wdctl restart: %r");
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	}
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}