378 lines
10 KiB
C
378 lines
10 KiB
C
/*
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* Copyright (c) 1982, 1986, 1989 Regents of the University of California.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* @(#)kern_time.c 7.15 (Berkeley) 3/17/91
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*/
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#include "param.h"
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#include "resourcevar.h"
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#include "kernel.h"
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#include "proc.h"
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#include "machine/cpu.h"
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/*
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* Time of day and interval timer support.
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*
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* These routines provide the kernel entry points to get and set
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* the time-of-day and per-process interval timers. Subroutines
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* here provide support for adding and subtracting timeval structures
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* and decrementing interval timers, optionally reloading the interval
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* timers when they expire.
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*/
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/* ARGSUSED */
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gettimeofday(p, uap, retval)
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struct proc *p;
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register struct args {
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struct timeval *tp;
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struct timezone *tzp;
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} *uap;
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int *retval;
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{
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struct timeval atv;
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int error = 0;
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if (uap->tp) {
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microtime(&atv);
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if (error = copyout((caddr_t)&atv, (caddr_t)uap->tp,
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sizeof (atv)))
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return (error);
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}
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if (uap->tzp)
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error = copyout((caddr_t)&tz, (caddr_t)uap->tzp,
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sizeof (tz));
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return (error);
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}
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/* ARGSUSED */
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settimeofday(p, uap, retval)
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struct proc *p;
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struct args {
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struct timeval *tv;
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struct timezone *tzp;
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} *uap;
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int *retval;
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{
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struct timeval atv;
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struct timezone atz;
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int error, s;
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if (error = suser(p->p_ucred, &p->p_acflag))
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return (error);
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if (uap->tv) {
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if (error = copyin((caddr_t)uap->tv, (caddr_t)&atv,
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sizeof (struct timeval)))
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return (error);
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/* WHAT DO WE DO ABOUT PENDING REAL-TIME TIMEOUTS??? */
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boottime.tv_sec += atv.tv_sec - time.tv_sec;
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s = splhigh(); time = atv; splx(s);
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resettodr();
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}
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if (uap->tzp && (error = copyin((caddr_t)uap->tzp, (caddr_t)&atz,
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sizeof (atz))) == 0)
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tz = atz;
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return (error);
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}
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extern int tickadj; /* "standard" clock skew, us./tick */
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int tickdelta; /* current clock skew, us. per tick */
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long timedelta; /* unapplied time correction, us. */
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long bigadj = 1000000; /* use 10x skew above bigadj us. */
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/* ARGSUSED */
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adjtime(p, uap, retval)
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struct proc *p;
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register struct args {
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struct timeval *delta;
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struct timeval *olddelta;
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} *uap;
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int *retval;
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{
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struct timeval atv, oatv;
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register long ndelta;
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int s, error;
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if (error = suser(p->p_ucred, &p->p_acflag))
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return (error);
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if (error =
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copyin((caddr_t)uap->delta, (caddr_t)&atv, sizeof (struct timeval)))
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return (error);
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ndelta = atv.tv_sec * 1000000 + atv.tv_usec;
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if (timedelta == 0)
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if (ndelta > bigadj)
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tickdelta = 10 * tickadj;
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else
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tickdelta = tickadj;
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if (ndelta % tickdelta)
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ndelta = ndelta / tickadj * tickadj;
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s = splclock();
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if (uap->olddelta) {
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oatv.tv_sec = timedelta / 1000000;
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oatv.tv_usec = timedelta % 1000000;
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}
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timedelta = ndelta;
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splx(s);
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if (uap->olddelta)
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(void) copyout((caddr_t)&oatv, (caddr_t)uap->olddelta,
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sizeof (struct timeval));
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return (0);
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}
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/*
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* Get value of an interval timer. The process virtual and
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* profiling virtual time timers are kept in the p_stats area, since
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* they can be swapped out. These are kept internally in the
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* way they are specified externally: in time until they expire.
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*
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* The real time interval timer is kept in the process table slot
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* for the process, and its value (it_value) is kept as an
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* absolute time rather than as a delta, so that it is easy to keep
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* periodic real-time signals from drifting.
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*
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* Virtual time timers are processed in the hardclock() routine of
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* kern_clock.c. The real time timer is processed by a timeout
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* routine, called from the softclock() routine. Since a callout
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* may be delayed in real time due to interrupt processing in the system,
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* it is possible for the real time timeout routine (realitexpire, given below),
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* to be delayed in real time past when it is supposed to occur. It
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* does not suffice, therefore, to reload the real timer .it_value from the
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* real time timers .it_interval. Rather, we compute the next time in
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* absolute time the timer should go off.
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*/
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/* ARGSUSED */
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getitimer(p, uap, retval)
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struct proc *p;
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register struct args {
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u_int which;
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struct itimerval *itv;
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} *uap;
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int *retval;
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{
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struct itimerval aitv;
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int s;
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if (uap->which > ITIMER_PROF)
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return (EINVAL);
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s = splclock();
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if (uap->which == ITIMER_REAL) {
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/*
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* Convert from absoulte to relative time in .it_value
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* part of real time timer. If time for real time timer
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* has passed return 0, else return difference between
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* current time and time for the timer to go off.
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*/
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aitv = p->p_realtimer;
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if (timerisset(&aitv.it_value))
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if (timercmp(&aitv.it_value, &time, <))
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timerclear(&aitv.it_value);
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else
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timevalsub(&aitv.it_value, &time);
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} else
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aitv = p->p_stats->p_timer[uap->which];
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splx(s);
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return (copyout((caddr_t)&aitv, (caddr_t)uap->itv,
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sizeof (struct itimerval)));
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}
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/* ARGSUSED */
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setitimer(p, uap, retval)
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struct proc *p;
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register struct args {
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u_int which;
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struct itimerval *itv, *oitv;
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} *uap;
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int *retval;
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{
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struct itimerval aitv;
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register struct itimerval *itvp;
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int s, error;
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if (uap->which > ITIMER_PROF)
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return (EINVAL);
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itvp = uap->itv;
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if (itvp && (error = copyin((caddr_t)itvp, (caddr_t)&aitv,
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sizeof(struct itimerval))))
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return (error);
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if ((uap->itv = uap->oitv) && (error = getitimer(p, uap, retval)))
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return (error);
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if (itvp == 0)
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return (0);
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if (itimerfix(&aitv.it_value) || itimerfix(&aitv.it_interval))
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return (EINVAL);
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s = splclock();
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if (uap->which == ITIMER_REAL) {
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untimeout(realitexpire, (caddr_t)p);
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if (timerisset(&aitv.it_value)) {
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timevaladd(&aitv.it_value, &time);
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timeout(realitexpire, (caddr_t)p, hzto(&aitv.it_value));
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}
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p->p_realtimer = aitv;
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} else
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p->p_stats->p_timer[uap->which] = aitv;
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splx(s);
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return (0);
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}
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/*
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* Real interval timer expired:
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* send process whose timer expired an alarm signal.
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* If time is not set up to reload, then just return.
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* Else compute next time timer should go off which is > current time.
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* This is where delay in processing this timeout causes multiple
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* SIGALRM calls to be compressed into one.
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*/
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realitexpire(p)
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register struct proc *p;
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{
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int s;
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psignal(p, SIGALRM);
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if (!timerisset(&p->p_realtimer.it_interval)) {
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timerclear(&p->p_realtimer.it_value);
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return;
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}
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for (;;) {
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s = splclock();
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timevaladd(&p->p_realtimer.it_value,
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&p->p_realtimer.it_interval);
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if (timercmp(&p->p_realtimer.it_value, &time, >)) {
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timeout(realitexpire, (caddr_t)p,
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hzto(&p->p_realtimer.it_value));
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splx(s);
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return;
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}
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splx(s);
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}
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}
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/*
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* Check that a proposed value to load into the .it_value or
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* .it_interval part of an interval timer is acceptable, and
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* fix it to have at least minimal value (i.e. if it is less
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* than the resolution of the clock, round it up.)
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*/
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itimerfix(tv)
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struct timeval *tv;
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{
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if (tv->tv_sec < 0 || tv->tv_sec > 100000000 ||
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tv->tv_usec < 0 || tv->tv_usec >= 1000000)
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return (EINVAL);
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if (tv->tv_sec == 0 && tv->tv_usec != 0 && tv->tv_usec < tick)
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tv->tv_usec = tick;
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return (0);
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}
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/*
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* Decrement an interval timer by a specified number
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* of microseconds, which must be less than a second,
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* i.e. < 1000000. If the timer expires, then reload
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* it. In this case, carry over (usec - old value) to
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* reducint the value reloaded into the timer so that
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* the timer does not drift. This routine assumes
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* that it is called in a context where the timers
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* on which it is operating cannot change in value.
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*/
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itimerdecr(itp, usec)
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register struct itimerval *itp;
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int usec;
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{
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if (itp->it_value.tv_usec < usec) {
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if (itp->it_value.tv_sec == 0) {
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/* expired, and already in next interval */
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usec -= itp->it_value.tv_usec;
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goto expire;
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}
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itp->it_value.tv_usec += 1000000;
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itp->it_value.tv_sec--;
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}
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itp->it_value.tv_usec -= usec;
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usec = 0;
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if (timerisset(&itp->it_value))
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return (1);
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/* expired, exactly at end of interval */
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expire:
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if (timerisset(&itp->it_interval)) {
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itp->it_value = itp->it_interval;
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itp->it_value.tv_usec -= usec;
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if (itp->it_value.tv_usec < 0) {
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itp->it_value.tv_usec += 1000000;
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itp->it_value.tv_sec--;
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}
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} else
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itp->it_value.tv_usec = 0; /* sec is already 0 */
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return (0);
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}
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/*
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* Add and subtract routines for timevals.
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* N.B.: subtract routine doesn't deal with
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* results which are before the beginning,
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* it just gets very confused in this case.
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* Caveat emptor.
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*/
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timevaladd(t1, t2)
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struct timeval *t1, *t2;
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{
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t1->tv_sec += t2->tv_sec;
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t1->tv_usec += t2->tv_usec;
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timevalfix(t1);
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}
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timevalsub(t1, t2)
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struct timeval *t1, *t2;
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{
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t1->tv_sec -= t2->tv_sec;
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t1->tv_usec -= t2->tv_usec;
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timevalfix(t1);
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}
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timevalfix(t1)
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struct timeval *t1;
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{
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if (t1->tv_usec < 0) {
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t1->tv_sec--;
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t1->tv_usec += 1000000;
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}
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if (t1->tv_usec >= 1000000) {
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t1->tv_sec++;
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t1->tv_usec -= 1000000;
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}
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}
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