xnu-792.22.5.tar.gz

[apple/xnu.git] / bsd / kern / kern_time.c

diff --git a/bsd/kern/kern_time.c b/bsd/kern/kern_time.c
index 0f225ed525a41148ba9dc1f9d9a3cce156af0e9e..906ba9ead3a62a0e1b309caab13c9e92183d19a1 100644 (file)
--- a/bsd/kern/kern_time.c
+++ b/bsd/kern/kern_time.c
@@ -1,23 +1,29 @@
 /*
 /*

- * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
+ * Copyright (c) 2000-2005 Apple Computer, Inc. All rights reserved.

  *
  *

- * @APPLE_LICENSE_HEADER_START@
+ * @APPLE_OSREFERENCE_LICENSE_HEADER_START@

  * 
  * 

- * The contents of this file constitute Original Code as defined in and
- * are subject to the Apple Public Source License Version 1.1 (the
- * "License").  You may not use this file except in compliance with the
- * License.  Please obtain a copy of the License at
- * http://www.apple.com/publicsource and read it before using this file.
+ * This file contains Original Code and/or Modifications of Original Code
+ * as defined in and that are subject to the Apple Public Source License
+ * Version 2.0 (the 'License'). You may not use this file except in
+ * compliance with the License. The rights granted to you under the License
+ * may not be used to create, or enable the creation or redistribution of,
+ * unlawful or unlicensed copies of an Apple operating system, or to
+ * circumvent, violate, or enable the circumvention or violation of, any
+ * terms of an Apple operating system software license agreement.

  * 
  * 

- * This Original Code and all software distributed under the License are
- * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
+ * Please obtain a copy of the License at
+ * http://www.opensource.apple.com/apsl/ and read it before using this file.
+ * 
+ * The Original Code and all software distributed under the License are
+ * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER

  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,

- * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
- * License for the specific language governing rights and limitations
- * under the License.
+ * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
+ * Please see the License for the specific language governing rights and
+ * limitations under the License.

  * 
  * 

- * @APPLE_LICENSE_HEADER_END@
+ * @APPLE_OSREFERENCE_LICENSE_HEADER_END@

  */
 /* Copyright (c) 1995 NeXT Computer, Inc. All Rights Reserved */
 /*
  */
 /* Copyright (c) 1995 NeXT Computer, Inc. All Rights Reserved */
 /*


@@ -59,18 +65,29 @@
 #include <sys/resourcevar.h>
 #include <sys/kernel.h>
 #include <sys/systm.h>
 #include <sys/resourcevar.h>
 #include <sys/kernel.h>
 #include <sys/systm.h>

-#include <sys/proc.h>
+#include <sys/proc_internal.h>
+#include <sys/kauth.h>

 #include <sys/vnode.h>
 
 #include <sys/vnode.h>
 

-#include <sys/mount.h>
-
-#include <kern/cpu_number.h>
+#include <sys/mount_internal.h>
+#include <sys/sysproto.h>
+#include <sys/signalvar.h>

 
 #include <kern/clock.h>
 
 #include <kern/clock.h>

+#include <kern/thread_call.h>

 
 #define HZ     100     /* XXX */
 
 
 #define HZ     100     /* XXX */
 

-struct timeval         time;
+/* simple lock used to access timezone, tz structure */
+lck_spin_t * tz_slock;
+lck_grp_t * tz_slock_grp;
+lck_attr_t * tz_slock_attr;
+lck_grp_attr_t *tz_slock_grp_attr;
+
+static void            setthetime(
+                                       struct timeval  *tv);
+
+void time_zone_slock_init(void);

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


@@ -81,250 +98,224 @@ struct timeval            time;
  * and decrementing interval timers, optionally reloading the interval
  * timers when they expire.
  */
  * and decrementing interval timers, optionally reloading the interval
  * timers when they expire.
  */

-struct gettimeofday_args{
-       struct timeval *tp;
-       struct timezone *tzp;
-};

 /* ARGSUSED */
 int
 /* ARGSUSED */
 int

-gettimeofday(p, uap, retval)
-       struct proc *p;
-       register struct gettimeofday_args *uap;
-       register_t *retval;
+gettimeofday(
+__unused       struct proc     *p,
+                       struct gettimeofday_args *uap, 
+                       register_t *retval)

 {
 {

-       struct timeval atv;

        int error = 0;
        int error = 0;

+       struct timezone ltz; /* local copy */

 
 

-       if (uap->tp) {
-               microtime(&atv);
-               if (error = copyout((caddr_t)&atv, (caddr_t)uap->tp,
-                       sizeof (atv)))
-                       return(error);
-       }
+       if (uap->tp)
+               clock_gettimeofday(&retval[0], &retval[1]);

        
        

-       if (uap->tzp)
-               error = copyout((caddr_t)&tz, (caddr_t)uap->tzp,
-                   sizeof (tz));
+       if (uap->tzp) {
+               lck_spin_lock(tz_slock);
+               ltz = tz;
+               lck_spin_unlock(tz_slock);
+
+               error = copyout((caddr_t)&ltz, CAST_USER_ADDR_T(uap->tzp), sizeof (tz));
+       }

 
 

-       return(error);
+       return (error);

 }
 
 }
 

-struct settimeofday_args {
-       struct timeval *tv;
-       struct timezone *tzp;
-};
+/*
+ * XXX Y2038 bug because of setthetime() argument
+ */

 /* ARGSUSED */
 int
 /* ARGSUSED */
 int

-settimeofday(p, uap, retval)
-       struct proc *p;
-       struct settimeofday_args  *uap;
-       register_t *retval;
+settimeofday(struct proc *p, struct settimeofday_args  *uap, __unused register_t *retval)

 {
        struct timeval atv;
        struct timezone atz;
 {
        struct timeval atv;
        struct timezone atz;

-       int error, s;
+       int error;

 
 

-       if (error = suser(p->p_ucred, &p->p_acflag))
-               return (error);
-       /* Verify all parameters before changing time. */
-       if (uap->tv && (error = copyin((caddr_t)uap->tv,
-           (caddr_t)&atv, sizeof(atv))))
+       if ((error = suser(kauth_cred_get(), &p->p_acflag)))

                return (error);
                return (error);

-       if (uap->tzp && (error = copyin((caddr_t)uap->tzp,
-           (caddr_t)&atz, sizeof(atz))))
+       /* Verify all parameters before changing time */
+       if (uap->tv) {
+               if (IS_64BIT_PROCESS(p)) {
+                       struct user_timeval user_atv;
+                       error = copyin(uap->tv, &user_atv, sizeof(struct user_timeval));
+                       atv.tv_sec = user_atv.tv_sec;
+                       atv.tv_usec = user_atv.tv_usec;
+               } else {
+                       error = copyin(uap->tv, &atv, sizeof(struct timeval));
+               }
+               if (error)
+                       return (error);
+       }
+       if (uap->tzp && (error = copyin(uap->tzp, (caddr_t)&atz, sizeof(atz))))

                return (error);
                return (error);

-       if (uap->tv)
+       if (uap->tv) {
+               timevalfix(&atv);
+               if (atv.tv_sec < 0 || (atv.tv_sec == 0 && atv.tv_usec < 0))
+                       return (EPERM);

                setthetime(&atv);
                setthetime(&atv);

-       if (uap->tzp)
+       }
+       if (uap->tzp) {
+               lck_spin_lock(tz_slock);

                tz = atz;
                tz = atz;

+               lck_spin_unlock(tz_slock);
+       }

        return (0);
 }
 
        return (0);
 }
 

-setthetime(tv)
-       struct timeval *tv;
+static void
+setthetime(
+       struct timeval  *tv)

 {
 {

-       mach_timespec_t now;
-       long delta;
-       int s;
-
-       now.tv_sec = tv->tv_sec;
-       now.tv_nsec = tv->tv_usec * NSEC_PER_USEC;
-
-       clock_set_calendar_value(now);
-       delta = tv->tv_sec - time.tv_sec;
-       boottime.tv_sec += delta;
-#if NFSCLIENT || NFSSERVER
-       lease_updatetime(delta);
-#endif
-       s = splhigh();
-       microtime(&time);
-       splx(s);
+       clock_set_calendar_microtime(tv->tv_sec, tv->tv_usec);

 }
 
 }
 

-int    tickadj = 240000 / (60 * HZ);   /* "standard" clock skew, us./tick */
-int    tickdelta;                      /* current clock skew, us. per tick */
-long   timedelta;                      /* unapplied time correction, us. */
-long   bigadj = 1000000;               /* use 10x skew above bigadj us. */
-
-struct adjtime_args {
-       struct timeval *delta;
-       struct timeval *olddelta;
-};
+/*
+ * XXX Y2038 bug because of clock_adjtime() first argument
+ */

 /* ARGSUSED */
 int
 /* ARGSUSED */
 int

-adjtime(p, uap, retval)
-       struct proc *p;
-       register struct adjtime_args *uap;
-       register_t *retval;
+adjtime(struct proc *p, register struct adjtime_args *uap, __unused register_t *retval)

 {
 {

-       struct timeval atv, oatv;
-       register long ndelta;
-       int s, error;
+       struct timeval atv;
+       int error;

 
 

-       if (error = suser(p->p_ucred, &p->p_acflag))
+       if ((error = suser(kauth_cred_get(), &p->p_acflag)))
+               return (error);
+       if (IS_64BIT_PROCESS(p)) {
+               struct user_timeval user_atv;
+               error = copyin(uap->delta, &user_atv, sizeof(struct user_timeval));
+               atv.tv_sec = user_atv.tv_sec;
+               atv.tv_usec = user_atv.tv_usec;
+       } else {
+               error = copyin(uap->delta, &atv, sizeof(struct timeval));
+       }
+       if (error)

                return (error);
                return (error);

-       if(error = copyin((caddr_t)uap->delta, (caddr_t)&atv,
-               sizeof (struct timeval)))
-               return(error);

                
                

-       ndelta = atv.tv_sec * 1000000 + atv.tv_usec;
-       if (timedelta == 0)
-               if (ndelta > bigadj)
-                       tickdelta = 10 * tickadj;
-               else
-                       tickdelta = tickadj;
-       if (ndelta % tickdelta)
-               ndelta = ndelta / tickdelta * tickdelta;
+       /*
+        * Compute the total correction and the rate at which to apply it.
+        */
+       clock_adjtime((int32_t *)&atv.tv_sec, &atv.tv_usec);

 
 

-       s = splclock();

        if (uap->olddelta) {
        if (uap->olddelta) {

-               oatv.tv_sec = timedelta / 1000000;
-               oatv.tv_usec = timedelta % 1000000;
+               if (IS_64BIT_PROCESS(p)) {
+                       struct user_timeval user_atv;
+                       user_atv.tv_sec = atv.tv_sec;
+                       user_atv.tv_usec = atv.tv_usec;
+                       error = copyout(&user_atv, uap->olddelta, sizeof(struct user_timeval));
+               } else {
+                       error = copyout(&atv, uap->olddelta, sizeof(struct timeval));
+               }

        }
        }

-       timedelta = ndelta;
-       splx(s);

 
 

-       if (uap->olddelta)
-               (void) copyout((caddr_t)&oatv, (caddr_t)uap->olddelta,
-                       sizeof (struct timeval));
-       return(0);
+       return (0);

 }
 
 }
 

-#define SECDAY          ((unsigned)(24*60*60))          /* seconds per day */
-#define SECYR           ((unsigned)(365*SECDAY))        /* per common year */
-#define YRREF           70      /* UNIX time referenced to 1970 */
-

 /*
 /*

- * Initialze the time of day register. 
- * Trust the RTC except for the case where it is set before 
- * the UNIX epoch. In that case use the the UNIX epoch.
- * The argument passed in is ignored.
+ *     Verify the calendar value.  If negative,
+ *     reset to zero (the epoch).

  */
 void
  */
 void

-inittodr(base)
-       time_t base;
+inittodr(
+       __unused time_t base)

 {
 {

-       /*
-        * Initialize the calendar by
-        * reading the BBC, if not already set.
-        */
-       clock_initialize_calendar();
+       struct timeval  tv;

 
        /*
 
        /*

+        * Assertion:
+        * The calendar has already been
+        * set up from the platform clock.
+        *

         * The value returned by microtime()
         * is gotten from the calendar.
         */
         * The value returned by microtime()
         * is gotten from the calendar.
         */

-       microtime(&time);
-
-       /*
-        * This variable still exists to keep
-        * 'w' happy.  It should only be considered
-        * an approximation.
-        */
-       boottime.tv_sec = time.tv_sec;
-       boottime.tv_usec = 0;
+       microtime(&tv);

 
 

-       /*
-        * If the RTC does not have acceptable value, i.e. time before
-        * the UNIX epoch, set it to the UNIX epoch
-        */
-       if (time.tv_sec < 0) {
+       if (tv.tv_sec < 0 || tv.tv_usec < 0) {

                printf ("WARNING: preposterous time in Real Time Clock");
                printf ("WARNING: preposterous time in Real Time Clock");

-               time.tv_sec = 0;        /* the UNIX epoch */
-               time.tv_usec = 0;
-               setthetime(&time);
-               boottime = time;
+               tv.tv_sec = 0;          /* the UNIX epoch */
+               tv.tv_usec = 0;
+               setthetime(&tv);

                printf(" -- CHECK AND RESET THE DATE!\n");
        }
                printf(" -- CHECK AND RESET THE DATE!\n");
        }

+}

 
 

-       return;
+time_t
+boottime_sec(void)
+{
+       uint32_t        sec, nanosec;
+       clock_get_boottime_nanotime(&sec, &nanosec);
+       return (sec);

 }
 
 }
 

+uint64_t tvtoabstime(struct timeval *tvp);
+

 /*
  * Get value of an interval timer.  The process virtual and
 /*
  * Get value of an interval timer.  The process virtual and

- * profiling virtual time timers are kept in the u. area, since
- * they can be swapped out.  These are kept internally in the
+ * profiling virtual time timers are kept internally in the

  * way they are specified externally: in time until they expire.
  *
  * way they are specified externally: in time until they expire.
  *

- * The real time interval timer is kept in the process table slot
- * for the process, and its value (it_value) is kept as an
- * absolute time rather than as a delta, so that it is easy to keep
- * periodic real-time signals from drifting.
+ * The real time interval timer expiration time (p_rtime)
+ * is kept as an absolute time rather than as a delta, so that
+ * it is easy to keep periodic real-time signals from drifting.

  *
  * Virtual time timers are processed in the hardclock() routine of
  *
  * Virtual time timers are processed in the hardclock() routine of

- * kern_clock.c.  The real time timer is processed by a timeout
- * routine, called from the softclock() routine.  Since a callout
- * may be delayed in real time due to interrupt processing in the system,
- * it is possible for the real time timeout routine (realitexpire, given below),
- * to be delayed in real time past when it is supposed to occur.  It
- * does not suffice, therefore, to reload the real timer .it_value from the
- * real time timers .it_interval.  Rather, we compute the next time in
- * absolute time the timer should go off.
+ * kern_clock.c.  The real time timer is processed by a callout
+ * routine.  Since a callout may be delayed in real time due to
+ * other processing in the system, it is possible for the real
+ * time callout routine (realitexpire, given below), to be delayed
+ * in real time past when it is supposed to occur.  It does not
+ * suffice, therefore, to reload the real time .it_value from the
+ * real time .it_interval.  Rather, we compute the next time in
+ * absolute time when the timer should go off.

  */
  
  */
  

-struct getitimer_args {
-       u_int   which;
-       struct itimerval *itv;
-}; 

 /* ARGSUSED */
 int
 /* ARGSUSED */
 int

-getitimer(p, uap, retval)
-       struct proc *p;
-       register struct getitimer_args *uap;
-       register_t *retval;
+getitimer(struct proc *p, register struct getitimer_args *uap, __unused register_t *retval)

 {
        struct itimerval aitv;
 {
        struct itimerval aitv;

-       int s;

 
        if (uap->which > ITIMER_PROF)
                return(EINVAL);
 
        if (uap->which > ITIMER_PROF)
                return(EINVAL);

-       
-       s = splclock();

        if (uap->which == ITIMER_REAL) {
                /*
        if (uap->which == ITIMER_REAL) {
                /*

-                * Convert from absoulte to relative time in .it_value
-                * part of real time timer.  If time for real time timer
-                * has passed return 0, else return difference between
-                * current time and time for the timer to go off.
+                * If time for real time timer has passed return 0,
+                * else return difference between current time and
+                * time for the timer to go off.

                 */
                aitv = p->p_realtimer;
                 */
                aitv = p->p_realtimer;

-               if (timerisset(&aitv.it_value))
-                       if (timercmp(&aitv.it_value, &time, <))
+               if (timerisset(&p->p_rtime)) {
+                       struct timeval          now;
+
+                       microuptime(&now);
+                       if (timercmp(&p->p_rtime, &now, <))

                                timerclear(&aitv.it_value);
                                timerclear(&aitv.it_value);

-                       else
-                               timevalsub(&aitv.it_value, &time);
-       } else
-               aitv =p->p_stats->p_timer[uap->which];
-       splx(s);
-       return(copyout((caddr_t)&aitv, (caddr_t)uap->itv,
-           sizeof (struct itimerval)));
+                       else {
+                               aitv.it_value = p->p_rtime;
+                               timevalsub(&aitv.it_value, &now);
+                       }
+               }
+               else
+                       timerclear(&aitv.it_value);
+       }
+       else
+               aitv = p->p_stats->p_timer[uap->which];
+
+       if (IS_64BIT_PROCESS(p)) {
+               struct user_itimerval user_itv;
+               user_itv.it_interval.tv_sec = aitv.it_interval.tv_sec;
+               user_itv.it_interval.tv_usec = aitv.it_interval.tv_usec;
+               user_itv.it_value.tv_sec = aitv.it_value.tv_sec;
+               user_itv.it_value.tv_usec = aitv.it_value.tv_usec;
+               return (copyout((caddr_t)&user_itv, uap->itv, sizeof (struct user_itimerval)));
+       } else {
+               return (copyout((caddr_t)&aitv, uap->itv, sizeof (struct itimerval)));
+       }

 }
 
 }
 

-struct setitimer_args {
-       u_int   which;
-       struct  itimerval *itv;
-       struct  itimerval *oitv;
-};

 /* ARGSUSED */
 int
 setitimer(p, uap, retval)
 /* ARGSUSED */
 int
 setitimer(p, uap, retval)


@@ -333,34 +324,49 @@ setitimer(p, uap, retval)
        register_t *retval;
 {
        struct itimerval aitv;
        register_t *retval;
 {
        struct itimerval aitv;

-       register struct itimerval *itvp;
-       int s, error;
+       user_addr_t itvp;
+       int error;

 
        if (uap->which > ITIMER_PROF)
 
        if (uap->which > ITIMER_PROF)

-               return(EINVAL);
-       itvp = uap->itv;
-       if (itvp && (error = copyin((caddr_t)itvp, (caddr_t)&aitv,
-           sizeof(struct itimerval))))
-               return (error);
-       if ((uap->itv = uap->oitv) &&
-           (error = getitimer(p, uap, retval)))
+               return (EINVAL);
+       if ((itvp = uap->itv)) {
+               if (IS_64BIT_PROCESS(p)) {
+                       struct user_itimerval user_itv;
+                       if ((error = copyin(itvp, (caddr_t)&user_itv, sizeof (struct user_itimerval))))
+                               return (error);
+                       aitv.it_interval.tv_sec = user_itv.it_interval.tv_sec;
+                       aitv.it_interval.tv_usec = user_itv.it_interval.tv_usec;
+                       aitv.it_value.tv_sec = user_itv.it_value.tv_sec;
+                       aitv.it_value.tv_usec = user_itv.it_value.tv_usec;
+               } else { 
+                       if ((error = copyin(itvp, (caddr_t)&aitv, sizeof (struct itimerval))))
+                               return (error);
+               }
+       }
+       if ((uap->itv = uap->oitv) && (error = getitimer(p, (struct getitimer_args *)uap, retval)))

                return (error);
        if (itvp == 0)
                return (0);
        if (itimerfix(&aitv.it_value) || itimerfix(&aitv.it_interval))
                return (EINVAL);
                return (error);
        if (itvp == 0)
                return (0);
        if (itimerfix(&aitv.it_value) || itimerfix(&aitv.it_interval))
                return (EINVAL);

-       s = splclock();

        if (uap->which == ITIMER_REAL) {
        if (uap->which == ITIMER_REAL) {

-               untimeout(realitexpire, (caddr_t)p);
+               thread_call_func_cancel((thread_call_func_t)realitexpire, (void *)p->p_pid, FALSE);

                if (timerisset(&aitv.it_value)) {
                if (timerisset(&aitv.it_value)) {

-                       timevaladd(&aitv.it_value, &time);
-                       timeout(realitexpire, (caddr_t)p, hzto(&aitv.it_value));
+                       microuptime(&p->p_rtime);
+                       timevaladd(&p->p_rtime, &aitv.it_value);
+                       thread_call_func_delayed(
+                                                               (thread_call_func_t)realitexpire, (void *)p->p_pid,
+                                                                               tvtoabstime(&p->p_rtime));

                }
                }

+               else
+                       timerclear(&p->p_rtime);
+

                p->p_realtimer = aitv;
                p->p_realtimer = aitv;

-       } else
+       }
+       else

                p->p_stats->p_timer[uap->which] = aitv;
                p->p_stats->p_timer[uap->which] = aitv;

-       splx(s);
-       return(0); /* To insure good return value on success */
+
+       return (0);

 }
 
 /*
 }
 
 /*


@@ -372,53 +378,48 @@ setitimer(p, uap, retval)
  * SIGALRM calls to be compressed into one.
  */
 void
  * SIGALRM calls to be compressed into one.
  */
 void

-realitexpire(arg)
-       void *arg;
+realitexpire(
+       void            *pid)

 {
        register struct proc *p;
 {
        register struct proc *p;

-       int s;
-       boolean_t       funnel_state;
-
-       funnel_state = thread_funnel_set(kernel_flock,TRUE);
+       struct timeval  now;
+       boolean_t               funnel_state;

 
 

-       p = (struct proc *)arg;
-       psignal(p, SIGALRM);
-       if (!timerisset(&p->p_realtimer.it_interval)) {
-               timerclear(&p->p_realtimer.it_value);
-                (void) thread_funnel_set(kernel_flock, FALSE);
+       funnel_state = thread_funnel_set(kernel_flock, TRUE);
+       p = pfind((pid_t)pid);
+       if (p == NULL) {
+               (void) thread_funnel_set(kernel_flock, FALSE);

                return;
        }
                return;
        }

-       
-       /*
-        * If the time's way off, don't try to compensate by getting
-        * there incrementally.
-        */
-       s = splclock();
-       if (p->p_realtimer.it_value.tv_sec < time.tv_sec - 10) {
-               p->p_realtimer.it_value = time;
-               timeout(realitexpire, (caddr_t)p,
-                       hzto(&p->p_realtimer.it_value));
-               splx(s);
-                (void) thread_funnel_set(kernel_flock, FALSE);
+
+       if (!timerisset(&p->p_realtimer.it_interval)) {
+               timerclear(&p->p_rtime);
+               psignal(p, SIGALRM);
+
+               (void) thread_funnel_set(kernel_flock, FALSE);

                return;
                return;

-               

        }
        }

-       splx(s);
-
-       for (;;) {
-               s = splclock();
-               timevaladd(&p->p_realtimer.it_value,
-                   &p->p_realtimer.it_interval);
-               if (timercmp(&p->p_realtimer.it_value, &time, >)) {
-                       timeout(realitexpire, (caddr_t)p,
-                           hzto(&p->p_realtimer.it_value));
-                       splx(s);
-                        (void) thread_funnel_set(kernel_flock, FALSE);
-                       return;
+
+       microuptime(&now);
+       timevaladd(&p->p_rtime, &p->p_realtimer.it_interval);
+       if (timercmp(&p->p_rtime, &now, <=)) {
+               if ((p->p_rtime.tv_sec + 2) >= now.tv_sec) {
+                       for (;;) {
+                               timevaladd(&p->p_rtime, &p->p_realtimer.it_interval);
+                               if (timercmp(&p->p_rtime, &now, >))
+                                       break;
+                       }
+               }
+               else {
+                       p->p_rtime = p->p_realtimer.it_interval;
+                       timevaladd(&p->p_rtime, &now);

                }
                }

-               splx(s);

        }
        }

-        
+
+       psignal(p, SIGALRM);
+
+       thread_call_func_delayed((thread_call_func_t)realitexpire, pid, tvtoabstime(&p->p_rtime));
+

        (void) thread_funnel_set(kernel_flock, FALSE);
 }
 
        (void) thread_funnel_set(kernel_flock, FALSE);
 }
 


@@ -492,8 +493,9 @@ expire:
  * Caveat emptor.
  */
 void
  * Caveat emptor.
  */
 void

-timevaladd(t1, t2)
-       struct timeval *t1, *t2;
+timevaladd(
+       struct timeval *t1,
+       struct timeval *t2)

 {
 
        t1->tv_sec += t2->tv_sec;
 {
 
        t1->tv_sec += t2->tv_sec;


@@ -501,8 +503,9 @@ timevaladd(t1, t2)
        timevalfix(t1);
 }
 void
        timevalfix(t1);
 }
 void

-timevalsub(t1, t2)
-       struct timeval *t1, *t2;
+timevalsub(
+       struct timeval *t1,
+       struct timeval *t2)

 {
 
        t1->tv_sec -= t2->tv_sec;
 {
 
        t1->tv_sec -= t2->tv_sec;


@@ -510,8 +513,8 @@ timevalsub(t1, t2)
        timevalfix(t1);
 }
 void
        timevalfix(t1);
 }
 void

-timevalfix(t1)
-       struct timeval *t1;
+timevalfix(
+       struct timeval *t1)

 {
 
        if (t1->tv_usec < 0) {
 {
 
        if (t1->tv_usec < 0) {


@@ -529,10 +532,61 @@ timevalfix(t1)
  * to which tvp points.
  */
 void
  * to which tvp points.
  */
 void

-microtime(struct timeval * tvp)
+microtime(
+       struct timeval  *tvp)
+{
+       clock_get_calendar_microtime((uint32_t *)&tvp->tv_sec, &tvp->tv_usec);
+}
+
+void
+microuptime(
+       struct timeval  *tvp)
+{
+       clock_get_system_microtime((uint32_t *)&tvp->tv_sec, &tvp->tv_usec);
+}
+
+/*
+ * Ditto for timespec.
+ */
+void
+nanotime(
+       struct timespec *tsp)
+{
+       clock_get_calendar_nanotime((uint32_t *)&tsp->tv_sec, (uint32_t *)&tsp->tv_nsec);
+}
+
+void
+nanouptime(
+       struct timespec *tsp)

 {
 {

-       mach_timespec_t         now = clock_get_calendar_value();
+       clock_get_system_nanotime((uint32_t *)&tsp->tv_sec, (uint32_t *)&tsp->tv_nsec);
+}

 
 

-       tvp->tv_sec = now.tv_sec;
-       tvp->tv_usec = now.tv_nsec / NSEC_PER_USEC;
+uint64_t
+tvtoabstime(
+       struct timeval  *tvp)
+{
+       uint64_t        result, usresult;
+
+       clock_interval_to_absolutetime_interval(
+                                               tvp->tv_sec, NSEC_PER_SEC, &result);
+       clock_interval_to_absolutetime_interval(
+                                               tvp->tv_usec, NSEC_PER_USEC, &usresult);
+
+       return (result + usresult);

 }
 }

+void
+time_zone_slock_init(void)
+{
+       /* allocate lock group attribute and group */
+       tz_slock_grp_attr = lck_grp_attr_alloc_init();
+
+       tz_slock_grp =  lck_grp_alloc_init("tzlock", tz_slock_grp_attr);
+
+       /* Allocate lock attribute */
+       tz_slock_attr = lck_attr_alloc_init();
+
+       /* Allocate the spin lock */
+       tz_slock = lck_spin_alloc_init(tz_slock_grp, tz_slock_attr);
+}
+