BSD 4_3_Net_2 release

[unix-history] / usr / src / sys / i386 / i386 / sys_machdep.c

/*-
* Copyright (c) 1990 The Regents of the University of California.
* All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* William Jolitz.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
*    notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
*    notice, this list of conditions and the following disclaimer in the
*    documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
*    must display the following acknowledgement:
*      This product includes software developed by the University of
*      California, Berkeley and its contributors.
* 4. Neither the name of the University nor the names of its contributors
*    may be used to endorse or promote products derived from this software
*    without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
*      @(#)sys_machdep.c       5.5 (Berkeley) 1/19/91
*/

#include "param.h"
#include "systm.h"
#include "ioctl.h"
#include "file.h"
#include "time.h"
#include "proc.h"
#include "uio.h"
#include "kernel.h"
#include "mtio.h"
#include "buf.h"
#include "trace.h"

#ifdef TRACE
int     nvualarm;

vtrace(p, uap, retval)
       struct proc *p;
       register struct args {
               int     request;
               int     value;
       } *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