4.4BSD/usr/src/sys/tahoe/tahoe/sys_machdep.c

/*
 * Copyright (c) 1988 Regents of the University of California.
 * All rights reserved.  The Berkeley software License Agreement
 * specifies the terms and conditions for redistribution.
 *
 *	@(#)sys_machdep.c	7.7 (Berkeley) 7/12/92
 */

#include "sys/param.h"
#include "sys/systm.h"
#include "sys/user.h"
#include "sys/ioctl.h"
#include "sys/file.h"
#include "sys/proc.h"
#include "sys/kernel.h"
#include "sys/mtio.h"
#include "sys/buf.h"

#include "../include/pte.h"

#ifdef TRACE
int	nvualarm;

struct vtrace_args {
	int	request;
	int	value;
};
/* ARGSUSED */
vtrace(p, uap, retval)
	register struct proc *p;
	register struct vtrace_args *uap;
	int *retval;
{
	int vdoualarm();

	switch (uap->request) {

	case VTR_DISABLE:		/* disable a trace point */
	case VTR_ENABLE:		/* enable a trace point */
		if (uap->value < 0 || uap->value >= TR_NFLAGS)
			return (EINVAL);
		*retval = traceflags[uap->value];
		traceflags[uap->value] = uap->request;
		break;

	case VTR_VALUE:		/* return a trace point setting */
		if (uap->value < 0 || uap->value >= TR_NFLAGS)
			return (EINVAL);
		*retval = traceflags[uap->value];
		break;

	case VTR_UALARM:	/* set a real-time ualarm, less than 1 min */
		if (uap->value <= 0 || uap->value > 60 * hz || nvualarm > 5)
			return (EINVAL);
		nvualarm++;
		timeout(vdoualarm, (caddr_t)p->p_pid, uap->value);
		break;

	case VTR_STAMP:
		trace(TR_STAMP, uap->value, p->p_pid);
		break;
	}
	return (0);
}

vdoualarm(arg)
	int arg;
{
	register struct proc *p;

	p = pfind(arg);
	if (p)
		psignal(p, 16);
	nvualarm--;
}
#endif