bsd/kern/kern_time.c

   1 /*
   2  * Copyright (c) 2000-2007 Apple Inc. All rights reserved.
   3  *
   4  * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
   5  *
   6  * This file contains Original Code and/or Modifications of Original Code
   7  * as defined in and that are subject to the Apple Public Source License
   8  * Version 2.0 (the 'License'). You may not use this file except in
   9  * compliance with the License. The rights granted to you under the License
  10  * may not be used to create, or enable the creation or redistribution of,
  11  * unlawful or unlicensed copies of an Apple operating system, or to
  12  * circumvent, violate, or enable the circumvention or violation of, any
  13  * terms of an Apple operating system software license agreement.
  14  *
  15  * Please obtain a copy of the License at
  16  * http://www.opensource.apple.com/apsl/ and read it before using this file.
  17  *
  18  * The Original Code and all software distributed under the License are
  19  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  20  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  21  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  22  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  23  * Please see the License for the specific language governing rights and
  24  * limitations under the License.
  25  *
  26  * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
  27  */
  28 /* Copyright (c) 1995 NeXT Computer, Inc. All Rights Reserved */
  29 /*
  30  * Copyright (c) 1982, 1986, 1989, 1993
  31  *      The Regents of the University of California.  All rights reserved.
  32  *
  33  * Redistribution and use in source and binary forms, with or without
  34  * modification, are permitted provided that the following conditions
  35  * are met:
  36  * 1. Redistributions of source code must retain the above copyright
  37  *    notice, this list of conditions and the following disclaimer.
  38  * 2. Redistributions in binary form must reproduce the above copyright
  39  *    notice, this list of conditions and the following disclaimer in the
  40  *    documentation and/or other materials provided with the distribution.
  41  * 3. All advertising materials mentioning features or use of this software
  42  *    must display the following acknowledgement:
  43  *      This product includes software developed by the University of
  44  *      California, Berkeley and its contributors.
  45  * 4. Neither the name of the University nor the names of its contributors
  46  *    may be used to endorse or promote products derived from this software
  47  *    without specific prior written permission.
  48  *
  49  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  50  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  51  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  52  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  53  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  54  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  55  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  56  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  57  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  58  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  59  * SUCH DAMAGE.
  60  *
  61  *      @(#)kern_time.c 8.4 (Berkeley) 5/26/95
  62  */
  63 /*
  64  * NOTICE: This file was modified by SPARTA, Inc. in 2005 to introduce
  65  * support for mandatory and extensible security protections.  This notice
  66  * is included in support of clause 2.2 (b) of the Apple Public License,
  67  * Version 2.0.
  68  */
  69
  70 #include <sys/param.h>
  71 #include <sys/resourcevar.h>
  72 #include <sys/kernel.h>
  73 #include <sys/systm.h>
  74 #include <sys/proc_internal.h>
  75 #include <sys/kauth.h>
  76 #include <sys/vnode.h>
  77
  78 #include <sys/mount_internal.h>
  79 #include <sys/sysproto.h>
  80 #include <sys/signalvar.h>
  81
  82 #include <kern/clock.h>
  83 #include <kern/task.h>
  84 #include <kern/thread_call.h>
  85 #if CONFIG_MACF
  86 #include <security/mac_framework.h>
  87 #endif
  88
  89 #define HZ      100     /* XXX */
  90
  91 /* simple lock used to access timezone, tz structure */
  92 lck_spin_t * tz_slock;
  93 lck_grp_t * tz_slock_grp;
  94 lck_attr_t * tz_slock_attr;
  95 lck_grp_attr_t  *tz_slock_grp_attr;
  96
  97 static void             setthetime(
  98                                         struct timeval  *tv);
  99
 100 void time_zone_slock_init(void) __attribute__((section("__TEXT, initcode")));
 101
 102 /*
 103  * Time of day and interval timer support.
 104  *
 105  * These routines provide the kernel entry points to get and set
 106  * the time-of-day and per-process interval timers.  Subroutines
 107  * here provide support for adding and subtracting timeval structures
 108  * and decrementing interval timers, optionally reloading the interval
 109  * timers when they expire.
 110  */
 111 /* ARGSUSED */
 112 int
 113 gettimeofday(
 114 __unused        struct proc     *p,
 115                         struct gettimeofday_args *uap,
 116                         register_t *retval)
 117 {
 118         int error = 0;
 119         struct timezone ltz; /* local copy */
 120
 121         if (uap->tp)
 122                 clock_gettimeofday((uint32_t *)&retval[0], (uint32_t *)&retval[1]);
 123
 124         if (uap->tzp) {
 125                 lck_spin_lock(tz_slock);
 126                 ltz = tz;
 127                 lck_spin_unlock(tz_slock);
 128
 129                 error = copyout((caddr_t)&ltz, CAST_USER_ADDR_T(uap->tzp), sizeof (tz));
 130         }
 131
 132         return (error);
 133 }
 134
 135 /*
 136  * XXX Y2038 bug because of setthetime() argument
 137  */
 138 /* ARGSUSED */
 139 int
 140 settimeofday(__unused struct proc *p, struct settimeofday_args  *uap, __unused register_t *retval)
 141 {
 142         struct timeval atv;
 143         struct timezone atz;
 144         int error;
 145
 146 #if CONFIG_MACF
 147         error = mac_system_check_settime(kauth_cred_get());
 148         if (error)
 149                 return (error);
 150 #endif
 151 #ifndef CONFIG_EMBEDDED
 152         if ((error = suser(kauth_cred_get(), &p->p_acflag)))
 153                 return (error);
 154 #endif
 155         /* Verify all parameters before changing time */
 156         if (uap->tv) {
 157                 if (IS_64BIT_PROCESS(p)) {
 158                         struct user_timeval user_atv;
 159                         error = copyin(uap->tv, &user_atv, sizeof(struct user_timeval));
 160                         atv.tv_sec = user_atv.tv_sec;
 161                         atv.tv_usec = user_atv.tv_usec;
 162                 } else {
 163                         error = copyin(uap->tv, &atv, sizeof(struct timeval));
 164                 }
 165                 if (error)
 166                         return (error);
 167         }
 168         if (uap->tzp && (error = copyin(uap->tzp, (caddr_t)&atz, sizeof(atz))))
 169                 return (error);
 170         if (uap->tv) {
 171                 timevalfix(&atv);
 172                 if (atv.tv_sec < 0 || (atv.tv_sec == 0 && atv.tv_usec < 0))
 173                         return (EPERM);
 174                 setthetime(&atv);
 175         }
 176         if (uap->tzp) {
 177                 lck_spin_lock(tz_slock);
 178                 tz = atz;
 179                 lck_spin_unlock(tz_slock);
 180         }
 181         return (0);
 182 }
 183
 184 static void
 185 setthetime(
 186         struct timeval  *tv)
 187 {
 188         clock_set_calendar_microtime(tv->tv_sec, tv->tv_usec);
 189 }
 190
 191 /*
 192  * XXX Y2038 bug because of clock_adjtime() first argument
 193  */
 194 /* ARGSUSED */
 195 int
 196 adjtime(struct proc *p, struct adjtime_args *uap, __unused register_t *retval)
 197 {
 198         struct timeval atv;
 199         int error;
 200
 201 #if CONFIG_MACF
 202         error = mac_system_check_settime(kauth_cred_get());
 203         if (error)
 204                 return (error);
 205 #endif
 206         if ((error = suser(kauth_cred_get(), &p->p_acflag)))
 207                 return (error);
 208         if (IS_64BIT_PROCESS(p)) {
 209                 struct user_timeval user_atv;
 210                 error = copyin(uap->delta, &user_atv, sizeof(struct user_timeval));
 211                 atv.tv_sec = user_atv.tv_sec;
 212                 atv.tv_usec = user_atv.tv_usec;
 213         } else {
 214                 error = copyin(uap->delta, &atv, sizeof(struct timeval));
 215         }
 216         if (error)
 217                 return (error);
 218
 219         /*
 220          * Compute the total correction and the rate at which to apply it.
 221          */
 222         clock_adjtime((int32_t *)&atv.tv_sec, &atv.tv_usec);
 223
 224         if (uap->olddelta) {
 225                 if (IS_64BIT_PROCESS(p)) {
 226                         struct user_timeval user_atv;
 227                         user_atv.tv_sec = atv.tv_sec;
 228                         user_atv.tv_usec = atv.tv_usec;
 229                         error = copyout(&user_atv, uap->olddelta, sizeof(struct user_timeval));
 230                 } else {
 231                         error = copyout(&atv, uap->olddelta, sizeof(struct timeval));
 232                 }
 233         }
 234
 235         return (0);
 236 }
 237
 238 /*
 239  *      Verify the calendar value.  If negative,
 240  *      reset to zero (the epoch).
 241  */
 242 void
 243 inittodr(
 244         __unused time_t base)
 245 {
 246         struct timeval  tv;
 247
 248         /*
 249          * Assertion:
 250          * The calendar has already been
 251          * set up from the platform clock.
 252          *
 253          * The value returned by microtime()
 254          * is gotten from the calendar.
 255          */
 256         microtime(&tv);
 257
 258         if (tv.tv_sec < 0 || tv.tv_usec < 0) {
 259                 printf ("WARNING: preposterous time in Real Time Clock");
 260                 tv.tv_sec = 0;          /* the UNIX epoch */
 261                 tv.tv_usec = 0;
 262                 setthetime(&tv);
 263                 printf(" -- CHECK AND RESET THE DATE!\n");
 264         }
 265 }
 266
 267 time_t
 268 boottime_sec(void)
 269 {
 270         uint32_t        sec, nanosec;
 271         clock_get_boottime_nanotime(&sec, &nanosec);
 272         return (sec);
 273 }
 274
 275 uint64_t tvtoabstime(struct timeval *tvp);
 276
 277 /*
 278  * Get value of an interval timer.  The process virtual and
 279  * profiling virtual time timers are kept internally in the
 280  * way they are specified externally: in time until they expire.
 281  *
 282  * The real time interval timer expiration time (p_rtime)
 283  * is kept as an absolute time rather than as a delta, so that
 284  * it is easy to keep periodic real-time signals from drifting.
 285  *
 286  * The real time timer is processed by a callout routine.
 287  * Since a callout may be delayed in real time due to
 288  * other processing in the system, it is possible for the real
 289  * time callout routine (realitexpire, given below), to be delayed
 290  * in real time past when it is supposed to occur.  It does not
 291  * suffice, therefore, to reload the real time .it_value from the
 292  * real time .it_interval.  Rather, we compute the next time in
 293  * absolute time when the timer should go off.
 294  *
 295  * Returns:     0                       Success
 296  *              EINVAL                  Invalid argument
 297  *      copyout:EFAULT                  Bad address
 298  */
 299 /* ARGSUSED */
 300 int
 301 getitimer(struct proc *p, struct getitimer_args *uap, __unused register_t *retval)
 302 {
 303         struct itimerval aitv;
 304
 305         if (uap->which > ITIMER_PROF)
 306                 return(EINVAL);
 307
 308         proc_spinlock(p);
 309         switch (uap->which) {
 310
 311         case ITIMER_REAL:
 312                 /*
 313                  * If time for real time timer has passed return 0,
 314                  * else return difference between current time and
 315                  * time for the timer to go off.
 316                  */
 317                 aitv = p->p_realtimer;
 318                 if (timerisset(&p->p_rtime)) {
 319                         struct timeval          now;
 320
 321                         microuptime(&now);
 322                         if (timercmp(&p->p_rtime, &now, <))
 323                                 timerclear(&aitv.it_value);
 324                         else {
 325                                 aitv.it_value = p->p_rtime;
 326                                 timevalsub(&aitv.it_value, &now);
 327                         }
 328                 }
 329                 else
 330                         timerclear(&aitv.it_value);
 331                 break;
 332
 333         case ITIMER_VIRTUAL:
 334                 aitv = p->p_vtimer_user;
 335                 break;
 336
 337         case ITIMER_PROF:
 338                 aitv = p->p_vtimer_prof;
 339                 break;
 340         }
 341
 342         proc_spinunlock(p);
 343
 344         if (IS_64BIT_PROCESS(p)) {
 345                 struct user_itimerval user_itv;
 346                 user_itv.it_interval.tv_sec = aitv.it_interval.tv_sec;
 347                 user_itv.it_interval.tv_usec = aitv.it_interval.tv_usec;
 348                 user_itv.it_value.tv_sec = aitv.it_value.tv_sec;
 349                 user_itv.it_value.tv_usec = aitv.it_value.tv_usec;
 350                 return (copyout((caddr_t)&user_itv, uap->itv, sizeof (struct user_itimerval)));
 351         } else {
 352                 return (copyout((caddr_t)&aitv, uap->itv, sizeof (struct itimerval)));
 353         }
 354 }
 355
 356 /*
 357  * Returns:     0                       Success
 358  *              EINVAL                  Invalid argument
 359  *      copyin:EFAULT                   Bad address
 360  *      getitimer:EINVAL                Invalid argument
 361  *      getitimer:EFAULT                Bad address
 362  */
 363 /* ARGSUSED */
 364 int
 365 setitimer(struct proc *p, struct setitimer_args *uap, register_t *retval)
 366 {
 367         struct itimerval aitv;
 368         user_addr_t itvp;
 369         int error;
 370
 371         if (uap->which > ITIMER_PROF)
 372                 return (EINVAL);
 373         if ((itvp = uap->itv)) {
 374                 if (IS_64BIT_PROCESS(p)) {
 375                         struct user_itimerval user_itv;
 376                         if ((error = copyin(itvp, (caddr_t)&user_itv, sizeof (struct user_itimerval))))
 377                                 return (error);
 378                         aitv.it_interval.tv_sec = user_itv.it_interval.tv_sec;
 379                         aitv.it_interval.tv_usec = user_itv.it_interval.tv_usec;
 380                         aitv.it_value.tv_sec = user_itv.it_value.tv_sec;
 381                         aitv.it_value.tv_usec = user_itv.it_value.tv_usec;
 382                 } else {
 383                         if ((error = copyin(itvp, (caddr_t)&aitv, sizeof (struct itimerval))))
 384                                 return (error);
 385                 }
 386         }
 387         if ((uap->itv = uap->oitv) && (error = getitimer(p, (struct getitimer_args *)uap, retval)))
 388                 return (error);
 389         if (itvp == 0)
 390                 return (0);
 391         if (itimerfix(&aitv.it_value) || itimerfix(&aitv.it_interval))
 392                 return (EINVAL);
 393
 394         switch (uap->which) {
 395
 396         case ITIMER_REAL:
 397                 proc_spinlock(p);
 398                 if (timerisset(&aitv.it_value)) {
 399                         microuptime(&p->p_rtime);
 400                         timevaladd(&p->p_rtime, &aitv.it_value);
 401                         p->p_realtimer = aitv;
 402                         if (!thread_call_enter_delayed(p->p_rcall, tvtoabstime(&p->p_rtime)))
 403                                 p->p_ractive++;
 404                 } else  {
 405                         timerclear(&p->p_rtime);
 406                         p->p_realtimer = aitv;
 407                         if (thread_call_cancel(p->p_rcall))
 408                                 p->p_ractive--;
 409                 }
 410                 proc_spinunlock(p);
 411
 412                 break;
 413
 414
 415         case ITIMER_VIRTUAL:
 416                 if (timerisset(&aitv.it_value))
 417                         task_vtimer_set(p->task, TASK_VTIMER_USER);
 418         else
 419                         task_vtimer_clear(p->task, TASK_VTIMER_USER);
 420
 421                 proc_spinlock(p);
 422                 p->p_vtimer_user = aitv;
 423                 proc_spinunlock(p);
 424                 break;
 425
 426         case ITIMER_PROF:
 427                 if (timerisset(&aitv.it_value))
 428                         task_vtimer_set(p->task, TASK_VTIMER_PROF);
 429                 else
 430                         task_vtimer_clear(p->task, TASK_VTIMER_PROF);
 431
 432                 proc_spinlock(p);
 433                 p->p_vtimer_prof = aitv;
 434                 proc_spinunlock(p);
 435                 break;
 436         }
 437
 438         return (0);
 439 }
 440
 441 /*
 442  * Real interval timer expired:
 443  * send process whose timer expired an alarm signal.
 444  * If time is not set up to reload, then just return.
 445  * Else compute next time timer should go off which is > current time.
 446  * This is where delay in processing this timeout causes multiple
 447  * SIGALRM calls to be compressed into one.
 448  */
 449 void
 450 realitexpire(
 451         struct proc     *p)
 452 {
 453         struct proc *r;
 454         struct timeval  t;
 455
 456         r = proc_find(p->p_pid);
 457
 458         proc_spinlock(p);
 459
 460         if (--p->p_ractive > 0 || r != p) {
 461                 proc_spinunlock(p);
 462
 463                 if (r != NULL)
 464                         proc_rele(r);
 465                 return;
 466         }
 467
 468         if (!timerisset(&p->p_realtimer.it_interval)) {
 469                 timerclear(&p->p_rtime);
 470                 proc_spinunlock(p);
 471
 472                 psignal(p, SIGALRM);
 473                 proc_rele(p);
 474                 return;
 475         }
 476
 477         microuptime(&t);
 478         timevaladd(&p->p_rtime, &p->p_realtimer.it_interval);
 479         if (timercmp(&p->p_rtime, &t, <=)) {
 480                 if ((p->p_rtime.tv_sec + 2) >= t.tv_sec) {
 481                         for (;;) {
 482                                 timevaladd(&p->p_rtime, &p->p_realtimer.it_interval);
 483                                 if (timercmp(&p->p_rtime, &t, >))
 484                                         break;
 485                         }
 486                 }
 487                 else {
 488                         p->p_rtime = p->p_realtimer.it_interval;
 489                         timevaladd(&p->p_rtime, &t);
 490                 }
 491         }
 492
 493         if (!thread_call_enter_delayed(p->p_rcall, tvtoabstime(&p->p_rtime)))
 494                 p->p_ractive++;
 495         proc_spinunlock(p);
 496
 497         psignal(p, SIGALRM);
 498         proc_rele(p);
 499 }
 500
 501 /*
 502  * Check that a proposed value to load into the .it_value or
 503  * .it_interval part of an interval timer is acceptable.
 504  */
 505 int
 506 itimerfix(
 507         struct timeval *tv)
 508 {
 509
 510         if (tv->tv_sec < 0 || tv->tv_sec > 100000000 ||
 511             tv->tv_usec < 0 || tv->tv_usec >= 1000000)
 512                 return (EINVAL);
 513         return (0);
 514 }
 515
 516 /*
 517  * Decrement an interval timer by a specified number
 518  * of microseconds, which must be less than a second,
 519  * i.e. < 1000000.  If the timer expires, then reload
 520  * it.  In this case, carry over (usec - old value) to
 521  * reduce the value reloaded into the timer so that
 522  * the timer does not drift.  This routine assumes
 523  * that it is called in a context where the timers
 524  * on which it is operating cannot change in value.
 525  */
 526 int
 527 itimerdecr(proc_t p,
 528         struct itimerval *itp, int usec)
 529 {
 530
 531         proc_spinlock(p);
 532
 533         if (itp->it_value.tv_usec < usec) {
 534                 if (itp->it_value.tv_sec == 0) {
 535                         /* expired, and already in next interval */
 536                         usec -= itp->it_value.tv_usec;
 537                         goto expire;
 538                 }
 539                 itp->it_value.tv_usec += 1000000;
 540                 itp->it_value.tv_sec--;
 541         }
 542         itp->it_value.tv_usec -= usec;
 543         usec = 0;
 544         if (timerisset(&itp->it_value)) {
 545                 proc_spinunlock(p);
 546                 return (1);
 547         }
 548         /* expired, exactly at end of interval */
 549 expire:
 550         if (timerisset(&itp->it_interval)) {
 551                 itp->it_value = itp->it_interval;
 552                 if (itp->it_value.tv_sec > 0) {
 553                 itp->it_value.tv_usec -= usec;
 554                 if (itp->it_value.tv_usec < 0) {
 555                         itp->it_value.tv_usec += 1000000;
 556                         itp->it_value.tv_sec--;
 557                         }
 558                 }
 559         } else
 560                 itp->it_value.tv_usec = 0;              /* sec is already 0 */
 561         proc_spinunlock(p);
 562         return (0);
 563 }
 564
 565 /*
 566  * Add and subtract routines for timevals.
 567  * N.B.: subtract routine doesn't deal with
 568  * results which are before the beginning,
 569  * it just gets very confused in this case.
 570  * Caveat emptor.
 571  */
 572 void
 573 timevaladd(
 574         struct timeval *t1,
 575         struct timeval *t2)
 576 {
 577
 578         t1->tv_sec += t2->tv_sec;
 579         t1->tv_usec += t2->tv_usec;
 580         timevalfix(t1);
 581 }
 582 void
 583 timevalsub(
 584         struct timeval *t1,
 585         struct timeval *t2)
 586 {
 587
 588         t1->tv_sec -= t2->tv_sec;
 589         t1->tv_usec -= t2->tv_usec;
 590         timevalfix(t1);
 591 }
 592 void
 593 timevalfix(
 594         struct timeval *t1)
 595 {
 596
 597         if (t1->tv_usec < 0) {
 598                 t1->tv_sec--;
 599                 t1->tv_usec += 1000000;
 600         }
 601         if (t1->tv_usec >= 1000000) {
 602                 t1->tv_sec++;
 603                 t1->tv_usec -= 1000000;
 604         }
 605 }
 606
 607 /*
 608  * Return the best possible estimate of the time in the timeval
 609  * to which tvp points.
 610  */
 611 void
 612 microtime(
 613         struct timeval  *tvp)
 614 {
 615         clock_get_calendar_microtime((uint32_t *)&tvp->tv_sec, (uint32_t *)&tvp->tv_usec);
 616 }
 617
 618 void
 619 microuptime(
 620         struct timeval  *tvp)
 621 {
 622         clock_get_system_microtime((uint32_t *)&tvp->tv_sec, (uint32_t *)&tvp->tv_usec);
 623 }
 624
 625 /*
 626  * Ditto for timespec.
 627  */
 628 void
 629 nanotime(
 630         struct timespec *tsp)
 631 {
 632         clock_get_calendar_nanotime((uint32_t *)&tsp->tv_sec, (uint32_t *)&tsp->tv_nsec);
 633 }
 634
 635 void
 636 nanouptime(
 637         struct timespec *tsp)
 638 {
 639         clock_get_system_nanotime((uint32_t *)&tsp->tv_sec, (uint32_t *)&tsp->tv_nsec);
 640 }
 641
 642 uint64_t
 643 tvtoabstime(
 644         struct timeval  *tvp)
 645 {
 646         uint64_t        result, usresult;
 647
 648         clock_interval_to_absolutetime_interval(
 649                                                 tvp->tv_sec, NSEC_PER_SEC, &result);
 650         clock_interval_to_absolutetime_interval(
 651                                                 tvp->tv_usec, NSEC_PER_USEC, &usresult);
 652
 653         return (result + usresult);
 654 }
 655 void
 656 time_zone_slock_init(void)
 657 {
 658         /* allocate lock group attribute and group */
 659         tz_slock_grp_attr = lck_grp_attr_alloc_init();
 660
 661         tz_slock_grp =  lck_grp_alloc_init("tzlock", tz_slock_grp_attr);
 662
 663         /* Allocate lock attribute */
 664         tz_slock_attr = lck_attr_alloc_init();
 665
 666         /* Allocate the spin lock */
 667         tz_slock = lck_spin_alloc_init(tz_slock_grp, tz_slock_attr);
 668 }