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Darwin 0.2 Driver Kit

change kernel's log() to these two:

int log(int level, const char *format, ...)
{
	register s = splhigh();
	va_list ap;
	extern int log_open;

	va_start(ap, format);
	vlog(level, format, ap);
	va_end(ap);
	return 0;
}

int vlog(int level, const char *format, va_list ap)
{
	register s = splhigh();
	extern int log_open;

	logpri(level);
	prf(format, ap, TOLOG, (struct tty *)0);
	splx(s);
	if (!log_open)
		prf(format, ap, TOCONS, (struct tty *)0);
	logwakeup();
	return 0;
}

...and make kernel IOLog like log(), with implied level.

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