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[unix-history] / usr / src / sys / kern / kern_time.c

/*      kern_time.c     5.6     82/09/08        */

#include "../h/param.h"
#include "../h/dir.h"           /* XXX */
#include "../h/user.h"
#include "../h/kernel.h"
#include "../h/reg.h"
#include "../h/inode.h"
#include "../h/proc.h"

/* 
* Time of day and interval timer support.
*/

gettimeofday()
{
       register struct a {
               struct  timeval *tp;
               struct  timezone *tzp;
       } *uap = (struct a *)u.u_ap;
       struct timeval atv;
       int s;

       s = spl7(); atv = time; splx(s);
       if (copyout((caddr_t)&atv, (caddr_t)uap->tp, sizeof (atv))) {
               u.u_error = EFAULT;
               return;
       }
       if (uap->tzp == 0)
               return;
       /* SHOULD HAVE PER-PROCESS TIMEZONE */
       if (copyout((caddr_t)&tz, uap->tzp, sizeof (tz))) {
               u.u_error = EFAULT;
               return;
       }
}

settimeofday()
{
       register struct a {
               struct  timeval *tv;
               struct  timezone *tzp;
       } *uap = (struct a *)u.u_ap;
       struct timeval atv;
       struct timezone atz;

       if (copyin((caddr_t)uap->tv, (caddr_t)&atv, sizeof (struct timeval))) {
               u.u_error = EFAULT;
               return;
       }
       setthetime(&atv);
       if (uap->tzp && suser()) {
               if (copyin((caddr_t)uap->tzp, (caddr_t)&atz, sizeof (atz))) {
                       u.u_error = EFAULT;
                       return;
               }
       }
}

setthetime(tv)
       struct timeval *tv;
{
       register int delta;
       int s;

       if (!suser())
               return;
       boottime.tv_sec += tv->tv_sec - time.tv_sec;
       s = spl7(); time = *tv; splx(s);
       clockset();
}

timevaladd(t1, t2)
       struct timeval *t1, *t2;
{

       t1->tv_sec += t2->tv_sec;
       t1->tv_usec += t2->tv_usec;
       timevalfix(t1);
}

timevalsub(t1, t2)
       struct timeval *t1, *t2;
{

       t1->tv_sec -= t2->tv_sec;
       t1->tv_usec -= t2->tv_usec;
       timevalfix(t1);
}

timevalfix(t1)
       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;
       }
}

getitimer()
{
       register struct a {
               u_int   which;
               struct  itimerval *itv;
       } *uap = (struct a *)u.u_ap;
       struct itimerval aitv;
       int s;

       if (uap->which > 2) {
               u.u_error = EINVAL;
               return;
       }
       s = spl7();
       if (uap->which == ITIMER_REAL) {
               aitv = u.u_procp->p_realtimer;
               if (timerisset(&aitv.it_value))
                       if (timercmp(&aitv.it_value, &time, <))
                               timerclear(&aitv.it_value);
                       else
                               timevalsub(&aitv.it_value, &time);
       } else
               aitv = u.u_timer[uap->which];
       splx(s);
       if (copyout((caddr_t)&aitv, uap->itv, sizeof (struct itimerval)))
               u.u_error = EFAULT;
       splx(s);
}

setitimer()
{
       register struct a {
               u_int   which;
               struct  itimerval *itv, *oitv;
       } *uap = (struct a *)u.u_ap;
       struct itimerval aitv;
       int s;
       register struct proc *p = u.u_procp;

       if (uap->which > 2) {
               u.u_error = EINVAL;
               return;
       }
       if (copyin((caddr_t)uap->itv, (caddr_t)&aitv,
           sizeof (struct itimerval))) {
               u.u_error = EFAULT;
               return;
       }
       if (uap->oitv) {
               uap->itv = uap->oitv;
               getitimer();
       }
       if (itimerfix(&aitv.it_value) || itimerfix(&aitv.it_interval)) {
               u.u_error = EINVAL;
               return;
       }
       s = spl7();
       if (uap->which == ITIMER_REAL) {
               untimeout(unrto, p);
               if (timerisset(&aitv.it_value)) {
                       timevaladd(&aitv.it_value, &time);
                       timeout(unrto, p, hzto(&aitv.it_value));
               }
               p->p_realtimer = aitv;
       } else
               u.u_timer[uap->which] = aitv;
       splx(s);
}

unrto(p)
       register struct proc *p;
{
       int s;

       psignal(p, SIGALRM);
       if (!timerisset(&p->p_realtimer.it_interval)) {
               timerclear(&p->p_realtimer.it_value);
               return;
       }
       for (;;) {
               s = spl7();
               timevaladd(&p->p_realtimer.it_value,
                   &p->p_realtimer.it_interval);
               if (timercmp(&p->p_realtimer.it_value, &time, >)) {
                       timeout(unrto, p, hzto(&p->p_realtimer.it_value));
                       splx(s);
                       return;
               }
               splx(s);
       }
}

itimerfix(tv)
       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 < tick)
               tv->tv_usec = tick;
       return (0);
}

itimerdecr(itp, usec)
       register struct itimerval *itp;
       int usec;
{

       if (itp->it_value.tv_usec < usec) {
               if (itp->it_value.tv_sec == 0) {
                       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 (timerisset(&itp->it_value))
               return (1);
expire:
       if (timerisset(&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;
       return (0);
}

#ifndef NOCOMPAT
otime()
{

       u.u_r.r_time = time.tv_sec;
}

ostime()
{
       register struct a {
               int     time;
       } *uap = (struct a *)u.u_ap;
       struct timeval tv;

       tv.tv_sec = uap->time;
       tv.tv_usec = 0;
       setthetime(&tv);
}

#include "../h/timeb.h"

oftime()
{
       register struct a {
               struct  timeb   *tp;
       } *uap;
       struct timeb t;

       uap = (struct a *)u.u_ap;
       (void) spl7();
       t.time = time.tv_sec;
       t.millitm = time.tv_usec / 1000;
       (void) spl0();
       t.timezone = tz.tz_minuteswest;
       t.dstflag = tz.tz_dsttime;
       if (copyout((caddr_t)&t, (caddr_t)uap->tp, sizeof(t)) < 0)
               u.u_error = EFAULT;
}
#endif
oalarm()
{
       register struct a {
               int     deltat;
       } *uap = (struct a *)u.u_ap;
       register struct proc *p = u.u_procp;
       struct timeval atv;
       int s = spl7();

       untimeout(unrto, p);
       timerclear(&p->p_realtimer.it_interval);
       u.u_r.r_val1 = 0;
       if (timerisset(&p->p_realtimer.it_value) &&
           timercmp(&p->p_realtimer.it_value, &time, >))
               u.u_r.r_val1 = p->p_realtimer.it_value.tv_sec - time.tv_sec;
       if (uap->deltat == 0) {
               splx(s);
               return;
       }
       p->p_realtimer.it_value = time;
       p->p_realtimer.it_value.tv_sec += uap->deltat;
       timeout(unrto, p, hzto(&p->p_realtimer.it_value));
       splx(s);
}