d2d3e8751c
structs and prototypes for syscalls. Ifdefed duplicated decentralized declarations of args structs. It's convenient to have this visible but they are hard to maintain. Some are already different from the central declarations. 4.4lite2 puts them in comments in the function headers but I wanted to avoid the large changes for that.
446 lines
12 KiB
C
446 lines
12 KiB
C
/*
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* Copyright (c) 1982, 1986, 1989, 1993
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* The Regents of the University of California. 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 8.1 (Berkeley) 6/10/93
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* $Id: kern_time.c,v 1.10 1995/06/29 07:07:00 davidg Exp $
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*/
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#include <sys/param.h>
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#include <sys/sysproto.h>
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#include <sys/resourcevar.h>
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#include <sys/signalvar.h>
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#include <sys/kernel.h>
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#include <sys/systm.h>
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#include <sys/proc.h>
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#include <sys/vnode.h>
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#include <machine/cpu.h>
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struct timezone tz;
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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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#ifndef _SYS_SYSPROTO_H_
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struct gettimeofday_args {
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struct timeval *tp;
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struct timezone *tzp;
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};
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#endif
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/* ARGSUSED */
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int
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gettimeofday(p, uap, retval)
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struct proc *p;
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register struct gettimeofday_args *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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#ifndef _SYS_SYSPROTO_H_
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struct settimeofday_args {
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struct timeval *tv;
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struct timezone *tzp;
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};
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#endif
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/* ARGSUSED */
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int
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settimeofday(p, uap, retval)
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struct proc *p;
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struct settimeofday_args *uap;
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int *retval;
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{
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struct timeval atv, delta;
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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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/* Verify all parameters before changing time. */
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if (uap->tv &&
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(error = copyin((caddr_t)uap->tv, (caddr_t)&atv, sizeof(atv))))
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return (error);
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if (uap->tzp &&
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(error = copyin((caddr_t)uap->tzp, (caddr_t)&atz, sizeof(atz))))
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return (error);
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if (uap->tv) {
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/* WHAT DO WE DO ABOUT PENDING REAL-TIME TIMEOUTS??? */
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s = splclock();
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/* nb. delta.tv_usec may be < 0, but this is OK here */
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delta.tv_sec = atv.tv_sec - time.tv_sec;
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delta.tv_usec = atv.tv_usec - time.tv_usec;
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time = atv;
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(void) splsoftclock();
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timevaladd(&boottime, &delta);
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timevalfix(&boottime);
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timevaladd(&runtime, &delta);
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timevalfix(&runtime);
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LEASE_UPDATETIME(delta.tv_sec);
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splx(s);
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resettodr();
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}
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if (uap->tzp)
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tz = atz;
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return (0);
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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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#ifndef _SYS_SYSPROTO_H_
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struct adjtime_args {
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struct timeval *delta;
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struct timeval *olddelta;
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};
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#endif
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/* ARGSUSED */
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int
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adjtime(p, uap, retval)
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struct proc *p;
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register struct adjtime_args *uap;
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int *retval;
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{
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struct timeval atv;
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register long ndelta, ntickdelta, odelta;
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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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/*
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* Compute the total correction and the rate at which to apply it.
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* Round the adjustment down to a whole multiple of the per-tick
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* delta, so that after some number of incremental changes in
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* hardclock(), tickdelta will become zero, lest the correction
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* overshoot and start taking us away from the desired final time.
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*/
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ndelta = atv.tv_sec * 1000000 + atv.tv_usec;
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if (ndelta > bigadj)
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ntickdelta = 10 * tickadj;
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else
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ntickdelta = tickadj;
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if (ndelta % ntickdelta)
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ndelta = ndelta / ntickdelta * ntickdelta;
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/*
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* To make hardclock()'s job easier, make the per-tick delta negative
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* if we want time to run slower; then hardclock can simply compute
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* tick + tickdelta, and subtract tickdelta from timedelta.
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*/
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if (ndelta < 0)
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ntickdelta = -ntickdelta;
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s = splclock();
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odelta = timedelta;
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timedelta = ndelta;
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tickdelta = ntickdelta;
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splx(s);
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if (uap->olddelta) {
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atv.tv_sec = odelta / 1000000;
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atv.tv_usec = odelta % 1000000;
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(void) copyout((caddr_t)&atv, (caddr_t)uap->olddelta,
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sizeof(struct timeval));
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}
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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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#ifndef _SYS_SYSPROTO_H_
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struct getitimer_args {
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u_int which;
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struct itimerval *itv;
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};
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#endif
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/* ARGSUSED */
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int
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getitimer(p, uap, retval)
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struct proc *p;
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register struct getitimer_args *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,
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(struct timeval *)&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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#ifndef _SYS_SYSPROTO_H_
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struct setitimer_args {
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u_int which;
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struct itimerval *itv, *oitv;
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};
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#endif
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/* ARGSUSED */
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int
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setitimer(p, uap, retval)
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struct proc *p;
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register struct setitimer_args *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, (struct timeval *)&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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* hzto() always adds 1 to allow for the time until the next clock
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* interrupt being strictly less than 1 clock tick, but we don't want
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* that here since we want to appear to be in sync with the clock
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* interrupt even when we're delayed.
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*/
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void
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realitexpire(arg)
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void *arg;
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{
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register struct proc *p;
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int s;
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p = (struct proc *)arg;
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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) - 1);
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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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int
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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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* reduce 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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int
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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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void
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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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void
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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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void
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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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