648 lines
16 KiB
C
648 lines
16 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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* $FreeBSD$
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*/
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/lock.h>
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#include <sys/mutex.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/sysent.h>
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#include <sys/proc.h>
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#include <sys/time.h>
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#include <sys/timetc.h>
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#include <sys/vnode.h>
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#include <vm/vm.h>
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#include <vm/vm_extern.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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static int nanosleep1(struct thread *td, struct timespec *rqt,
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struct timespec *rmt);
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static int settime(struct thread *, struct timeval *);
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static void timevalfix(struct timeval *);
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static void no_lease_updatetime(int);
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static void
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no_lease_updatetime(deltat)
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int deltat;
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{
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}
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void (*lease_updatetime)(int) = no_lease_updatetime;
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static int
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settime(struct thread *td, struct timeval *tv)
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{
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struct timeval delta, tv1, tv2;
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static struct timeval maxtime, laststep;
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struct timespec ts;
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int s;
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s = splclock();
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microtime(&tv1);
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delta = *tv;
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timevalsub(&delta, &tv1);
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/*
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* If the system is secure, we do not allow the time to be
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* set to a value earlier than 1 second less than the highest
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* time we have yet seen. The worst a miscreant can do in
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* this circumstance is "freeze" time. He couldn't go
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* back to the past.
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*
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* We similarly do not allow the clock to be stepped more
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* than one second, nor more than once per second. This allows
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* a miscreant to make the clock march double-time, but no worse.
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*/
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if (securelevel_gt(td->td_ucred, 1) != 0) {
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if (delta.tv_sec < 0 || delta.tv_usec < 0) {
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/*
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* Update maxtime to latest time we've seen.
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*/
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if (tv1.tv_sec > maxtime.tv_sec)
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maxtime = tv1;
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tv2 = *tv;
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timevalsub(&tv2, &maxtime);
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if (tv2.tv_sec < -1) {
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tv->tv_sec = maxtime.tv_sec - 1;
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printf("Time adjustment clamped to -1 second\n");
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}
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} else {
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if (tv1.tv_sec == laststep.tv_sec) {
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splx(s);
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return (EPERM);
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}
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if (delta.tv_sec > 1) {
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tv->tv_sec = tv1.tv_sec + 1;
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printf("Time adjustment clamped to +1 second\n");
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}
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laststep = *tv;
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}
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}
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ts.tv_sec = tv->tv_sec;
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ts.tv_nsec = tv->tv_usec * 1000;
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mtx_lock(&Giant);
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tc_setclock(&ts);
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(void) splsoftclock();
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lease_updatetime(delta.tv_sec);
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splx(s);
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resettodr();
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mtx_unlock(&Giant);
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return (0);
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}
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#ifndef _SYS_SYSPROTO_H_
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struct clock_gettime_args {
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clockid_t clock_id;
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struct timespec *tp;
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};
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#endif
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/*
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* MPSAFE
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*/
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/* ARGSUSED */
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int
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clock_gettime(struct thread *td, struct clock_gettime_args *uap)
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{
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struct timespec ats;
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if (SCARG(uap, clock_id) != CLOCK_REALTIME)
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return (EINVAL);
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mtx_lock(&Giant);
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nanotime(&ats);
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mtx_unlock(&Giant);
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return (copyout(&ats, SCARG(uap, tp), sizeof(ats)));
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}
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#ifndef _SYS_SYSPROTO_H_
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struct clock_settime_args {
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clockid_t clock_id;
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const struct timespec *tp;
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};
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#endif
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/*
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* MPSAFE
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*/
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/* ARGSUSED */
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int
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clock_settime(struct thread *td, struct clock_settime_args *uap)
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{
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struct timeval atv;
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struct timespec ats;
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int error;
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if ((error = suser(td)) != 0)
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return (error);
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if (SCARG(uap, clock_id) != CLOCK_REALTIME)
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return (EINVAL);
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if ((error = copyin(SCARG(uap, tp), &ats, sizeof(ats))) != 0)
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return (error);
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if (ats.tv_nsec < 0 || ats.tv_nsec >= 1000000000)
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return (EINVAL);
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/* XXX Don't convert nsec->usec and back */
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TIMESPEC_TO_TIMEVAL(&atv, &ats);
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error = settime(td, &atv);
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return (error);
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}
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#ifndef _SYS_SYSPROTO_H_
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struct clock_getres_args {
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clockid_t clock_id;
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struct timespec *tp;
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};
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#endif
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int
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clock_getres(struct thread *td, struct clock_getres_args *uap)
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{
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struct timespec ts;
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int error;
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if (SCARG(uap, clock_id) != CLOCK_REALTIME)
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return (EINVAL);
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error = 0;
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if (SCARG(uap, tp)) {
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ts.tv_sec = 0;
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ts.tv_nsec = 1000000000 / tc_getfrequency();
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error = copyout(&ts, SCARG(uap, tp), sizeof(ts));
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}
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return (error);
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}
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static int nanowait;
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static int
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nanosleep1(struct thread *td, struct timespec *rqt, struct timespec *rmt)
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{
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struct timespec ts, ts2, ts3;
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struct timeval tv;
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int error;
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if (rqt->tv_nsec < 0 || rqt->tv_nsec >= 1000000000)
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return (EINVAL);
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if (rqt->tv_sec < 0 || (rqt->tv_sec == 0 && rqt->tv_nsec == 0))
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return (0);
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getnanouptime(&ts);
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timespecadd(&ts, rqt);
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TIMESPEC_TO_TIMEVAL(&tv, rqt);
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for (;;) {
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error = tsleep(&nanowait, PWAIT | PCATCH, "nanslp",
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tvtohz(&tv));
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getnanouptime(&ts2);
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if (error != EWOULDBLOCK) {
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if (error == ERESTART)
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error = EINTR;
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if (rmt != NULL) {
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timespecsub(&ts, &ts2);
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if (ts.tv_sec < 0)
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timespecclear(&ts);
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*rmt = ts;
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}
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return (error);
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}
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if (timespeccmp(&ts2, &ts, >=))
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return (0);
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ts3 = ts;
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timespecsub(&ts3, &ts2);
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TIMESPEC_TO_TIMEVAL(&tv, &ts3);
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}
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}
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#ifndef _SYS_SYSPROTO_H_
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struct nanosleep_args {
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struct timespec *rqtp;
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struct timespec *rmtp;
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};
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#endif
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/*
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* MPSAFE
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*/
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/* ARGSUSED */
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int
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nanosleep(struct thread *td, struct nanosleep_args *uap)
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{
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struct timespec rmt, rqt;
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int error;
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error = copyin(SCARG(uap, rqtp), &rqt, sizeof(rqt));
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if (error)
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return (error);
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mtx_lock(&Giant);
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if (SCARG(uap, rmtp)) {
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if (!useracc((caddr_t)SCARG(uap, rmtp), sizeof(rmt),
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VM_PROT_WRITE)) {
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error = EFAULT;
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goto done2;
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}
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}
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error = nanosleep1(td, &rqt, &rmt);
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if (error && SCARG(uap, rmtp)) {
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int error2;
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error2 = copyout(&rmt, SCARG(uap, rmtp), sizeof(rmt));
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if (error2) /* XXX shouldn't happen, did useracc() above */
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error = error2;
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}
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done2:
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mtx_unlock(&Giant);
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return (error);
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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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/*
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* MPSAFE
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*/
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/* ARGSUSED */
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int
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gettimeofday(struct thread *td, struct gettimeofday_args *uap)
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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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error = copyout(&atv, uap->tp, sizeof (atv));
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}
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if (error == 0 && uap->tzp != NULL) {
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mtx_lock(&Giant);
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error = copyout(&tz, uap->tzp, sizeof (tz));
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mtx_unlock(&Giant);
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}
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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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/*
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* MPSAFE
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*/
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/* ARGSUSED */
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int
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settimeofday(struct thread *td, struct settimeofday_args *uap)
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{
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struct timeval atv;
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struct timezone atz;
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int error = 0;
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if ((error = suser(td)))
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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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if ((error = copyin(uap->tv, &atv, sizeof(atv))))
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return (error);
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if (atv.tv_usec < 0 || atv.tv_usec >= 1000000)
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return (EINVAL);
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}
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if (uap->tzp &&
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(error = copyin(uap->tzp, &atz, sizeof(atz))))
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return (error);
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if (uap->tv && (error = settime(td, &atv)))
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return (error);
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if (uap->tzp) {
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mtx_lock(&Giant);
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tz = atz;
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mtx_unlock(&Giant);
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}
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return (error);
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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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/*
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* MPSAFE
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*/
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/* ARGSUSED */
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int
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getitimer(struct thread *td, struct getitimer_args *uap)
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{
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struct proc *p = td->td_proc;
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struct timeval ctv;
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struct itimerval aitv;
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int s;
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int error;
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if (uap->which > ITIMER_PROF)
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return (EINVAL);
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mtx_lock(&Giant);
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s = splclock(); /* XXX still needed ? */
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if (uap->which == ITIMER_REAL) {
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/*
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* Convert from absolute 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 (timevalisset(&aitv.it_value)) {
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getmicrouptime(&ctv);
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if (timevalcmp(&aitv.it_value, &ctv, <))
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timevalclear(&aitv.it_value);
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else
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timevalsub(&aitv.it_value, &ctv);
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}
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} else {
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aitv = p->p_stats->p_timer[uap->which];
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}
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splx(s);
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error = copyout(&aitv, uap->itv, sizeof (struct itimerval));
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mtx_unlock(&Giant);
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return(error);
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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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/*
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* MPSAFE
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*/
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/* ARGSUSED */
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int
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setitimer(struct thread *td, struct setitimer_args *uap)
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{
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struct proc *p = td->td_proc;
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struct itimerval aitv;
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struct timeval ctv;
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struct itimerval *itvp;
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int s, error = 0;
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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(itvp, &aitv, sizeof(struct itimerval))))
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return (error);
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mtx_lock(&Giant);
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if ((uap->itv = uap->oitv) &&
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(error = getitimer(td, (struct getitimer_args *)uap))) {
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goto done2;
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}
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if (itvp == 0) {
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error = 0;
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goto done2;
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}
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if (itimerfix(&aitv.it_value)) {
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error = EINVAL;
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goto done2;
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}
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if (!timevalisset(&aitv.it_value)) {
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timevalclear(&aitv.it_interval);
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} else if (itimerfix(&aitv.it_interval)) {
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error = EINVAL;
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goto done2;
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}
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s = splclock(); /* XXX: still needed ? */
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if (uap->which == ITIMER_REAL) {
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if (timevalisset(&p->p_realtimer.it_value))
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callout_stop(&p->p_itcallout);
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if (timevalisset(&aitv.it_value))
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callout_reset(&p->p_itcallout, tvtohz(&aitv.it_value),
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realitexpire, p);
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getmicrouptime(&ctv);
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timevaladd(&aitv.it_value, &ctv);
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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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}
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splx(s);
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done2:
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mtx_unlock(&Giant);
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return (error);
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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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* tvtohz() 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(void *arg)
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{
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struct proc *p;
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struct timeval ctv, ntv;
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int s;
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p = (struct proc *)arg;
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PROC_LOCK(p);
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psignal(p, SIGALRM);
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if (!timevalisset(&p->p_realtimer.it_interval)) {
|
|
timevalclear(&p->p_realtimer.it_value);
|
|
PROC_UNLOCK(p);
|
|
return;
|
|
}
|
|
for (;;) {
|
|
s = splclock(); /* XXX: still neeeded ? */
|
|
timevaladd(&p->p_realtimer.it_value,
|
|
&p->p_realtimer.it_interval);
|
|
getmicrouptime(&ctv);
|
|
if (timevalcmp(&p->p_realtimer.it_value, &ctv, >)) {
|
|
ntv = p->p_realtimer.it_value;
|
|
timevalsub(&ntv, &ctv);
|
|
callout_reset(&p->p_itcallout, tvtohz(&ntv) - 1,
|
|
realitexpire, p);
|
|
splx(s);
|
|
PROC_UNLOCK(p);
|
|
return;
|
|
}
|
|
splx(s);
|
|
}
|
|
/*NOTREACHED*/
|
|
}
|
|
|
|
/*
|
|
* Check that a proposed value to load into the .it_value or
|
|
* .it_interval part of an interval timer is acceptable, and
|
|
* fix it to have at least minimal value (i.e. if it is less
|
|
* than the resolution of the clock, round it up.)
|
|
*/
|
|
int
|
|
itimerfix(struct timeval *tv)
|
|
{
|
|
|
|
if (tv->tv_sec < 0 || tv->tv_sec > 100000000 ||
|
|
tv->tv_usec < 0 || tv->tv_usec >= 1000000)
|
|
return (EINVAL);
|
|
if (tv->tv_sec == 0 && tv->tv_usec != 0 && tv->tv_usec < tick)
|
|
tv->tv_usec = tick;
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Decrement an interval timer by a specified number
|
|
* of microseconds, which must be less than a second,
|
|
* i.e. < 1000000. If the timer expires, then reload
|
|
* it. In this case, carry over (usec - old value) to
|
|
* reduce the value reloaded into the timer so that
|
|
* the timer does not drift. This routine assumes
|
|
* that it is called in a context where the timers
|
|
* on which it is operating cannot change in value.
|
|
*/
|
|
int
|
|
itimerdecr(struct itimerval *itp, int usec)
|
|
{
|
|
|
|
if (itp->it_value.tv_usec < usec) {
|
|
if (itp->it_value.tv_sec == 0) {
|
|
/* expired, and already in next interval */
|
|
usec -= itp->it_value.tv_usec;
|
|
goto expire;
|
|
}
|
|
itp->it_value.tv_usec += 1000000;
|
|
itp->it_value.tv_sec--;
|
|
}
|
|
itp->it_value.tv_usec -= usec;
|
|
usec = 0;
|
|
if (timevalisset(&itp->it_value))
|
|
return (1);
|
|
/* expired, exactly at end of interval */
|
|
expire:
|
|
if (timevalisset(&itp->it_interval)) {
|
|
itp->it_value = itp->it_interval;
|
|
itp->it_value.tv_usec -= usec;
|
|
if (itp->it_value.tv_usec < 0) {
|
|
itp->it_value.tv_usec += 1000000;
|
|
itp->it_value.tv_sec--;
|
|
}
|
|
} else
|
|
itp->it_value.tv_usec = 0; /* sec is already 0 */
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Add and subtract routines for timevals.
|
|
* N.B.: subtract routine doesn't deal with
|
|
* results which are before the beginning,
|
|
* it just gets very confused in this case.
|
|
* Caveat emptor.
|
|
*/
|
|
void
|
|
timevaladd(struct timeval *t1, struct timeval *t2)
|
|
{
|
|
|
|
t1->tv_sec += t2->tv_sec;
|
|
t1->tv_usec += t2->tv_usec;
|
|
timevalfix(t1);
|
|
}
|
|
|
|
void
|
|
timevalsub(struct timeval *t1, struct timeval *t2)
|
|
{
|
|
|
|
t1->tv_sec -= t2->tv_sec;
|
|
t1->tv_usec -= t2->tv_usec;
|
|
timevalfix(t1);
|
|
}
|
|
|
|
static void
|
|
timevalfix(struct timeval *t1)
|
|
{
|
|
|
|
if (t1->tv_usec < 0) {
|
|
t1->tv_sec--;
|
|
t1->tv_usec += 1000000;
|
|
}
|
|
if (t1->tv_usec >= 1000000) {
|
|
t1->tv_sec++;
|
|
t1->tv_usec -= 1000000;
|
|
}
|
|
}
|