xnu-1228.0.2.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 2948aff9867aab93dcf29416cbde280c8370258f..30b0a651c7697133dd45b4ad7feaadaa97eda7b4 100644 (file)
--- a/bsd/kern/kern_time.c
+++ b/bsd/kern/kern_time.c
@@ -1,5 +1,5 @@
 /*
 /*

- * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
+ * Copyright (c) 2000-2007 Apple Inc. All rights reserved.

  *
  * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
  * 
  *
  * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
  * 


@@ -60,6 +60,12 @@
  *
  *     @(#)kern_time.c 8.4 (Berkeley) 5/26/95
  */
  *
  *     @(#)kern_time.c 8.4 (Berkeley) 5/26/95
  */

+/*
+ * NOTICE: This file was modified by SPARTA, Inc. in 2005 to introduce
+ * support for mandatory and extensible security protections.  This notice
+ * is included in support of clause 2.2 (b) of the Apple Public License,
+ * Version 2.0.
+ */

 
 #include <sys/param.h>
 #include <sys/resourcevar.h>
 
 #include <sys/param.h>
 #include <sys/resourcevar.h>


@@ -74,7 +80,11 @@
 #include <sys/signalvar.h>
 
 #include <kern/clock.h>
 #include <sys/signalvar.h>
 
 #include <kern/clock.h>

+#include <kern/task.h>

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

+#if CONFIG_MACF
+#include <security/mac_framework.h>
+#endif

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


@@ -87,15 +97,7 @@ lck_grp_attr_t       *tz_slock_grp_attr;
 static void            setthetime(
                                        struct timeval  *tv);
 
 static void            setthetime(
                                        struct timeval  *tv);
 

-void time_zone_slock_init(void);
-
-int gettimeofday(struct proc *p,
-#ifdef __ppc__
-                        struct ppc_gettimeofday_args *uap, 
-#else                   
-                        struct gettimeofday_args *uap, 
-#endif
-                        register_t *retval);
+void time_zone_slock_init(void) __attribute__((section("__TEXT, initcode")));

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


@@ -105,52 +107,29 @@ int gettimeofday(struct proc *p,
  * here provide support for adding and subtracting timeval structures
  * and decrementing interval timers, optionally reloading the interval
  * timers when they expire.
  * here provide support for adding and subtracting timeval structures
  * and decrementing interval timers, optionally reloading the interval
  * timers when they expire.

- *
- * XXX Y2038 bug because of clock_get_calendar_microtime() first argument

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

-gettimeofday(__unused struct proc *p,
-#ifdef __ppc__
-                        register struct ppc_gettimeofday_args *uap, 
-#else                   
-                        register struct gettimeofday_args *uap, 
-#endif
-                        __unused register_t *retval)
+gettimeofday(
+__unused       struct proc     *p,
+                       struct gettimeofday_args *uap, 
+                       register_t *retval)

 {
 {

-       struct timeval atv;

        int error = 0;
        struct timezone ltz; /* local copy */
 
        int error = 0;
        struct timezone ltz; /* local copy */
 

-/*  NOTE THIS implementation is for non ppc architectures only */
-
-       if (uap->tp) {
-               clock_get_calendar_microtime((uint32_t *)&atv.tv_sec, &atv.tv_usec);
-               if (IS_64BIT_PROCESS(p)) {
-                       struct user_timeval user_atv;
-                       user_atv.tv_sec = atv.tv_sec;
-                       user_atv.tv_usec = atv.tv_usec;
-                       /*
-                        * This cast is not necessary for PPC, but is
-                        * mostly harmless.
-                        */
-                       error = copyout(&user_atv, CAST_USER_ADDR_T(uap->tp), sizeof(struct user_timeval));
-               } else {
-                       error = copyout(&atv, CAST_USER_ADDR_T(uap->tp), sizeof(struct timeval));
-               }
-               if (error)
-                       return(error);
-       }
+       if (uap->tp)
+               clock_gettimeofday((uint32_t *)&retval[0], (uint32_t *)&retval[1]);

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

        }
 
        }
 

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

 }
 
 /*
 }
 
 /*


@@ -158,14 +137,21 @@ gettimeofday(__unused struct proc *p,
  */
 /* ARGSUSED */
 int
  */
 /* ARGSUSED */
 int

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

 {
        struct timeval atv;
        struct timezone atz;
        int error;
 
 {
        struct timeval atv;
        struct timezone atz;
        int error;
 

+#if CONFIG_MACF
+       error = mac_system_check_settime(kauth_cred_get());
+       if (error)
+               return (error);
+#endif
+#ifndef CONFIG_EMBEDDED

        if ((error = suser(kauth_cred_get(), &p->p_acflag)))
                return (error);
        if ((error = suser(kauth_cred_get(), &p->p_acflag)))
                return (error);

+#endif

        /* Verify all parameters before changing time */
        if (uap->tv) {
                if (IS_64BIT_PROCESS(p)) {
        /* Verify all parameters before changing time */
        if (uap->tv) {
                if (IS_64BIT_PROCESS(p)) {


@@ -207,11 +193,16 @@ setthetime(
  */
 /* ARGSUSED */
 int
  */
 /* ARGSUSED */
 int

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

 {
        struct timeval atv;
        int error;
 
 {
        struct timeval atv;
        int error;
 

+#if CONFIG_MACF
+       error = mac_system_check_settime(kauth_cred_get());
+       if (error)
+               return (error);
+#endif

        if ((error = suser(kauth_cred_get(), &p->p_acflag)))
                return (error);
        if (IS_64BIT_PROCESS(p)) {
        if ((error = suser(kauth_cred_get(), &p->p_acflag)))
                return (error);
        if (IS_64BIT_PROCESS(p)) {


@@ -292,26 +283,32 @@ uint64_t tvtoabstime(struct timeval *tvp);
  * is kept as an absolute time rather than as a delta, so that
  * it is easy to keep periodic real-time signals from drifting.
  *
  * 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
- * kern_clock.c.  The real time timer is processed by a callout
- * routine.  Since a callout may be delayed in real time due to
+ * 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.
  * 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.

+ *
+ * Returns:    0                       Success
+ *             EINVAL                  Invalid argument
+ *     copyout:EFAULT                  Bad address

  */
  */

- 

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

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

 {
        struct itimerval aitv;
 
        if (uap->which > ITIMER_PROF)
                return(EINVAL);
 {
        struct itimerval aitv;
 
        if (uap->which > ITIMER_PROF)
                return(EINVAL);

-       if (uap->which == ITIMER_REAL) {
+
+       proc_spinlock(p);
+       switch (uap->which) {
+
+       case ITIMER_REAL:

                /*
                 * If time for real time timer has passed return 0,
                 * else return difference between current time and
                /*
                 * If time for real time timer has passed return 0,
                 * else return difference between current time and


@@ -331,9 +328,18 @@ getitimer(struct proc *p, register struct getitimer_args *uap, __unused register
                }
                else
                        timerclear(&aitv.it_value);
                }
                else
                        timerclear(&aitv.it_value);

+               break;
+
+       case ITIMER_VIRTUAL:
+               aitv = p->p_vtimer_user;
+               break;
+
+       case ITIMER_PROF:
+               aitv = p->p_vtimer_prof;
+               break;

        }
        }

-       else
-               aitv = p->p_stats->p_timer[uap->which];
+
+       proc_spinunlock(p);

 
        if (IS_64BIT_PROCESS(p)) {
                struct user_itimerval user_itv;
 
        if (IS_64BIT_PROCESS(p)) {
                struct user_itimerval user_itv;


@@ -347,12 +353,16 @@ getitimer(struct proc *p, register struct getitimer_args *uap, __unused register
        }
 }
 
        }
 }
 

+/*
+ * Returns:    0                       Success
+ *             EINVAL                  Invalid argument
+ *     copyin:EFAULT                   Bad address
+ *     getitimer:EINVAL                Invalid argument
+ *     getitimer:EFAULT                Bad address
+ */

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

-setitimer(p, uap, retval)
-       struct proc *p;
-       register struct setitimer_args *uap;
-       register_t *retval;
+setitimer(struct proc *p, struct setitimer_args *uap, register_t *retval)

 {
        struct itimerval aitv;
        user_addr_t itvp;
 {
        struct itimerval aitv;
        user_addr_t itvp;


@@ -380,22 +390,50 @@ setitimer(p, uap, retval)
                return (0);
        if (itimerfix(&aitv.it_value) || itimerfix(&aitv.it_interval))
                return (EINVAL);
                return (0);
        if (itimerfix(&aitv.it_value) || itimerfix(&aitv.it_interval))
                return (EINVAL);

-       if (uap->which == ITIMER_REAL) {
-               thread_call_func_cancel((thread_call_func_t)realitexpire, (void *)p->p_pid, FALSE);
+
+       switch (uap->which) {
+
+       case ITIMER_REAL:
+               proc_spinlock(p);

                if (timerisset(&aitv.it_value)) {
                        microuptime(&p->p_rtime);
                        timevaladd(&p->p_rtime, &aitv.it_value);
                if (timerisset(&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));
+                       p->p_realtimer = aitv;
+                       if (!thread_call_enter_delayed(p->p_rcall, tvtoabstime(&p->p_rtime)))
+                               p->p_ractive++;
+               } else  {
+                       timerclear(&p->p_rtime);
+                       p->p_realtimer = aitv;
+                       if (thread_call_cancel(p->p_rcall))
+                               p->p_ractive--;

                }
                }

+               proc_spinunlock(p);
+
+               break;
+
+
+       case ITIMER_VIRTUAL:
+               if (timerisset(&aitv.it_value))
+                       task_vtimer_set(p->task, TASK_VTIMER_USER);
+       else
+                       task_vtimer_clear(p->task, TASK_VTIMER_USER);
+
+               proc_spinlock(p);
+               p->p_vtimer_user = aitv;
+               proc_spinunlock(p);
+               break;
+
+       case ITIMER_PROF:
+               if (timerisset(&aitv.it_value))
+                       task_vtimer_set(p->task, TASK_VTIMER_PROF);

                else
                else

-                       timerclear(&p->p_rtime);
+                       task_vtimer_clear(p->task, TASK_VTIMER_PROF);

 
 

-               p->p_realtimer = aitv;
+               proc_spinlock(p);
+               p->p_vtimer_prof = aitv;
+               proc_spinunlock(p);
+               break;

        }
        }

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

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


@@ -410,66 +448,68 @@ setitimer(p, uap, retval)
  */
 void
 realitexpire(
  */
 void
 realitexpire(

-       void            *pid)
+       struct proc     *p)

 {
 {

-       register struct proc *p;
-       struct timeval  now;
-       boolean_t               funnel_state;
-
-       funnel_state = thread_funnel_set(kernel_flock, TRUE);
-       p = pfind((pid_t)pid);
-       if (p == NULL) {
-               (void) thread_funnel_set(kernel_flock, FALSE);
+       struct proc *r;
+       struct timeval  t;
+
+       r = proc_find(p->p_pid);
+
+       proc_spinlock(p);
+
+       if (--p->p_ractive > 0 || r != p) {
+               proc_spinunlock(p);
+
+               if (r != NULL)
+                       proc_rele(r);

                return;
        }
                return;
        }

-
+       

        if (!timerisset(&p->p_realtimer.it_interval)) {
                timerclear(&p->p_rtime);
        if (!timerisset(&p->p_realtimer.it_interval)) {
                timerclear(&p->p_rtime);

-               psignal(p, SIGALRM);
+               proc_spinunlock(p);

 
 

-               (void) thread_funnel_set(kernel_flock, FALSE);
+               psignal(p, SIGALRM);
+               proc_rele(p);

                return;
        }
 
                return;
        }
 

-       microuptime(&now);
+       microuptime(&t);

        timevaladd(&p->p_rtime, &p->p_realtimer.it_interval);
        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) {
+       if (timercmp(&p->p_rtime, &t, <=)) {
+               if ((p->p_rtime.tv_sec + 2) >= t.tv_sec) {

                        for (;;) {
                                timevaladd(&p->p_rtime, &p->p_realtimer.it_interval);
                        for (;;) {
                                timevaladd(&p->p_rtime, &p->p_realtimer.it_interval);

-                               if (timercmp(&p->p_rtime, &now, >))
+                               if (timercmp(&p->p_rtime, &t, >))

                                        break;
                        }
                }
                else {
                        p->p_rtime = p->p_realtimer.it_interval;
                                        break;
                        }
                }
                else {
                        p->p_rtime = p->p_realtimer.it_interval;

-                       timevaladd(&p->p_rtime, &now);
+                       timevaladd(&p->p_rtime, &t);

                }
        }
 
                }
        }
 

-       psignal(p, SIGALRM);
-
-       thread_call_func_delayed((thread_call_func_t)realitexpire, pid, tvtoabstime(&p->p_rtime));
+       if (!thread_call_enter_delayed(p->p_rcall, tvtoabstime(&p->p_rtime)))
+               p->p_ractive++;
+       proc_spinunlock(p);

 
 

-       (void) thread_funnel_set(kernel_flock, FALSE);
+       psignal(p, SIGALRM);
+       proc_rele(p);

 }
 
 /*
  * Check that a proposed value to load into the .it_value or
 }
 
 /*
  * 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.)
+ * .it_interval part of an interval timer is acceptable.

  */
 int
  */
 int

-itimerfix(tv)
-       struct timeval *tv;
+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_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);
 }
 
        return (0);
 }
 


@@ -478,17 +518,18 @@ itimerfix(tv)
  * 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
  * 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

- * reducint the value reloaded into the timer so that
+ * 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
  * 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(itp, usec)
-       register struct itimerval *itp;
-       int usec;
+itimerdecr(proc_t p,
+       struct itimerval *itp, int usec)

 {
 
 {
 

+       proc_spinlock(p);
+       

        if (itp->it_value.tv_usec < usec) {
                if (itp->it_value.tv_sec == 0) {
                        /* expired, and already in next interval */
        if (itp->it_value.tv_usec < usec) {
                if (itp->it_value.tv_sec == 0) {
                        /* expired, and already in next interval */


@@ -500,19 +541,24 @@ itimerdecr(itp, usec)
        }
        itp->it_value.tv_usec -= usec;
        usec = 0;
        }
        itp->it_value.tv_usec -= usec;
        usec = 0;

-       if (timerisset(&itp->it_value))
+       if (timerisset(&itp->it_value)) {
+               proc_spinunlock(p);

                return (1);
                return (1);

+       }

        /* expired, exactly at end of interval */
 expire:
        if (timerisset(&itp->it_interval)) {
                itp->it_value = itp->it_interval;
        /* expired, exactly at end of interval */
 expire:
        if (timerisset(&itp->it_interval)) {
                itp->it_value = itp->it_interval;

+               if (itp->it_value.tv_sec > 0) {

                itp->it_value.tv_usec -= usec;
                if (itp->it_value.tv_usec < 0) {
                        itp->it_value.tv_usec += 1000000;
                        itp->it_value.tv_sec--;
                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 */
                }
        } else
                itp->it_value.tv_usec = 0;              /* sec is already 0 */

+       proc_spinunlock(p);

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


@@ -566,14 +612,14 @@ void
 microtime(
        struct timeval  *tvp)
 {
 microtime(
        struct timeval  *tvp)
 {

-       clock_get_calendar_microtime((uint32_t *)&tvp->tv_sec, &tvp->tv_usec);
+       clock_get_calendar_microtime((uint32_t *)&tvp->tv_sec, (uint32_t *)&tvp->tv_usec);

 }
 
 void
 microuptime(
        struct timeval  *tvp)
 {
 }
 
 void
 microuptime(
        struct timeval  *tvp)
 {

-       clock_get_system_microtime((uint32_t *)&tvp->tv_sec, &tvp->tv_usec);
+       clock_get_system_microtime((uint32_t *)&tvp->tv_sec, (uint32_t *)&tvp->tv_usec);

 }
 
 /*
 }
 
 /*


@@ -611,15 +657,12 @@ time_zone_slock_init(void)
 {
        /* allocate lock group attribute and group */
        tz_slock_grp_attr = lck_grp_attr_alloc_init();
 {
        /* allocate lock group attribute and group */
        tz_slock_grp_attr = lck_grp_attr_alloc_init();

-       lck_grp_attr_setstat(tz_slock_grp_attr);

 
        tz_slock_grp =  lck_grp_alloc_init("tzlock", tz_slock_grp_attr);
 
        /* Allocate lock attribute */
        tz_slock_attr = lck_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();

-       //lck_attr_setdebug(tz_slock_attr);

 
        /* Allocate the spin lock */
        tz_slock = lck_spin_alloc_init(tz_slock_grp, tz_slock_attr);
 }
 
        /* Allocate the spin lock */
        tz_slock = lck_spin_alloc_init(tz_slock_grp, tz_slock_attr);
 }

-