sys/compat/linux/linux_time.c

   1 /*      $NetBSD: linux_time.c,v 1.14 2006/05/14 03:40:54 christos Exp $ */
   2
   3 /*-
   4  * Copyright (c) 2001 The NetBSD Foundation, Inc.
   5  * All rights reserved.
   6  *
   7  * This code is derived from software contributed to The NetBSD Foundation
   8  * by Emmanuel Dreyfus.
   9  *
  10  * Redistribution and use in source and binary forms, with or without
  11  * modification, are permitted provided that the following conditions
  12  * are met:
  13  * 1. Redistributions of source code must retain the above copyright
  14  *    notice, this list of conditions and the following disclaimer.
  15  * 2. Redistributions in binary form must reproduce the above copyright
  16  *    notice, this list of conditions and the following disclaimer in the
  17  *    documentation and/or other materials provided with the distribution.
  18  *
  19  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
  20  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
  21  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  22  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
  23  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  24  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  25  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  26  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  27  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  28  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  29  * POSSIBILITY OF SUCH DAMAGE.
  30  */
  31
  32 #include <sys/cdefs.h>
  33 __FBSDID("$FreeBSD$");
  34 #if 0
  35 __KERNEL_RCSID(0, "$NetBSD: linux_time.c,v 1.14 2006/05/14 03:40:54 christos Exp $");
  36 #endif
  37
  38 #include "opt_compat.h"
  39 #include "opt_kdtrace.h"
  40
  41 #include <sys/param.h>
  42 #include <sys/kernel.h>
  43 #include <sys/lock.h>
  44 #include <sys/ucred.h>
  45 #include <sys/mount.h>
  46 #include <sys/mutex.h>
  47 #include <sys/resourcevar.h>
  48 #include <sys/sdt.h>
  49 #include <sys/signal.h>
  50 #include <sys/stdint.h>
  51 #include <sys/syscallsubr.h>
  52 #include <sys/sysproto.h>
  53 #include <sys/time.h>
  54 #include <sys/systm.h>
  55 #include <sys/proc.h>
  56
  57 #ifdef COMPAT_LINUX32
  58 #include <machine/../linux32/linux.h>
  59 #include <machine/../linux32/linux32_proto.h>
  60 #else
  61 #include <machine/../linux/linux.h>
  62 #include <machine/../linux/linux_proto.h>
  63 #endif
  64
  65 #include <compat/linux/linux_dtrace.h>
  66 #include <compat/linux/linux_timer.h>
  67
  68 /* DTrace init */
  69 LIN_SDT_PROVIDER_DECLARE(LINUX_DTRACE);
  70
  71 /**
  72  * DTrace probes in this module.
  73  */
  74 LIN_SDT_PROBE_DEFINE2(time, native_to_linux_timespec, entry,
  75     "struct l_timespec *", "struct timespec *");
  76 LIN_SDT_PROBE_DEFINE0(time, native_to_linux_timespec, return);
  77 LIN_SDT_PROBE_DEFINE2(time, linux_to_native_timespec, entry,
  78     "struct timespec *", "struct l_timespec *");
  79 LIN_SDT_PROBE_DEFINE1(time, linux_to_native_timespec, return, "int");
  80 LIN_SDT_PROBE_DEFINE2(time, linux_to_native_clockid, entry, "clockid_t *",
  81     "clockid_t");
  82 LIN_SDT_PROBE_DEFINE1(time, linux_to_native_clockid, unsupported_clockid,
  83     "clockid_t");
  84 LIN_SDT_PROBE_DEFINE1(time, linux_to_native_clockid, unknown_clockid,
  85     "clockid_t");
  86 LIN_SDT_PROBE_DEFINE1(time, linux_to_native_clockid, return, "int");
  87 LIN_SDT_PROBE_DEFINE2(time, linux_clock_gettime, entry, "clockid_t",
  88     "struct l_timespec *");
  89 LIN_SDT_PROBE_DEFINE1(time, linux_clock_gettime, conversion_error, "int");
  90 LIN_SDT_PROBE_DEFINE1(time, linux_clock_gettime, gettime_error, "int");
  91 LIN_SDT_PROBE_DEFINE1(time, linux_clock_gettime, copyout_error, "int");
  92 LIN_SDT_PROBE_DEFINE1(time, linux_clock_gettime, return, "int");
  93 LIN_SDT_PROBE_DEFINE2(time, linux_clock_settime, entry, "clockid_t",
  94     "struct l_timespec *");
  95 LIN_SDT_PROBE_DEFINE1(time, linux_clock_settime, conversion_error, "int");
  96 LIN_SDT_PROBE_DEFINE1(time, linux_clock_settime, settime_error, "int");
  97 LIN_SDT_PROBE_DEFINE1(time, linux_clock_settime, copyin_error, "int");
  98 LIN_SDT_PROBE_DEFINE1(time, linux_clock_settime, return, "int");
  99 LIN_SDT_PROBE_DEFINE2(time, linux_clock_getres, entry, "clockid_t",
 100     "struct l_timespec *");
 101 LIN_SDT_PROBE_DEFINE0(time, linux_clock_getres, nullcall);
 102 LIN_SDT_PROBE_DEFINE1(time, linux_clock_getres, conversion_error, "int");
 103 LIN_SDT_PROBE_DEFINE1(time, linux_clock_getres, getres_error, "int");
 104 LIN_SDT_PROBE_DEFINE1(time, linux_clock_getres, copyout_error, "int");
 105 LIN_SDT_PROBE_DEFINE1(time, linux_clock_getres, return, "int");
 106 LIN_SDT_PROBE_DEFINE2(time, linux_nanosleep, entry, "const struct l_timespec *",
 107     "struct l_timespec *");
 108 LIN_SDT_PROBE_DEFINE1(time, linux_nanosleep, conversion_error, "int");
 109 LIN_SDT_PROBE_DEFINE1(time, linux_nanosleep, copyout_error, "int");
 110 LIN_SDT_PROBE_DEFINE1(time, linux_nanosleep, copyin_error, "int");
 111 LIN_SDT_PROBE_DEFINE1(time, linux_nanosleep, return, "int");
 112 LIN_SDT_PROBE_DEFINE4(time, linux_clock_nanosleep, entry, "clockid_t", "int",
 113     "struct l_timespec *", "struct l_timespec *");
 114 LIN_SDT_PROBE_DEFINE1(time, linux_clock_nanosleep, conversion_error, "int");
 115 LIN_SDT_PROBE_DEFINE1(time, linux_clock_nanosleep, copyout_error, "int");
 116 LIN_SDT_PROBE_DEFINE1(time, linux_clock_nanosleep, copyin_error, "int");
 117 LIN_SDT_PROBE_DEFINE1(time, linux_clock_nanosleep, unsupported_flags, "int");
 118 LIN_SDT_PROBE_DEFINE1(time, linux_clock_nanosleep, unsupported_clockid, "int");
 119 LIN_SDT_PROBE_DEFINE1(time, linux_clock_nanosleep, return, "int");
 120
 121
 122 void
 123 native_to_linux_timespec(struct l_timespec *ltp, struct timespec *ntp)
 124 {
 125
 126         LIN_SDT_PROBE2(time, native_to_linux_timespec, entry, ltp, ntp);
 127
 128         ltp->tv_sec = ntp->tv_sec;
 129         ltp->tv_nsec = ntp->tv_nsec;
 130
 131         LIN_SDT_PROBE0(time, native_to_linux_timespec, return);
 132 }
 133
 134 int
 135 linux_to_native_timespec(struct timespec *ntp, struct l_timespec *ltp)
 136 {
 137
 138         LIN_SDT_PROBE2(time, linux_to_native_timespec, entry, ntp, ltp);
 139
 140         if (ltp->tv_sec < 0 || ltp->tv_nsec > (l_long)999999999L) {
 141                 LIN_SDT_PROBE1(time, linux_to_native_timespec, return, EINVAL);
 142                 return (EINVAL);
 143         }
 144         ntp->tv_sec = ltp->tv_sec;
 145         ntp->tv_nsec = ltp->tv_nsec;
 146
 147         LIN_SDT_PROBE1(time, linux_to_native_timespec, return, 0);
 148         return (0);
 149 }
 150
 151 int
 152 linux_to_native_clockid(clockid_t *n, clockid_t l)
 153 {
 154
 155         LIN_SDT_PROBE2(time, linux_to_native_clockid, entry, n, l);
 156
 157         if (l < 0) {
 158                 /* cpu-clock */
 159                 if ((l & LINUX_CLOCKFD_MASK) == LINUX_CLOCKFD)
 160                         return (EINVAL);
 161                 if (LINUX_CPUCLOCK_WHICH(l) >= LINUX_CPUCLOCK_MAX)
 162                         return (EINVAL);
 163
 164                 if (LINUX_CPUCLOCK_PERTHREAD(l))
 165                         *n = CLOCK_THREAD_CPUTIME_ID;
 166                 else
 167                         *n = CLOCK_PROCESS_CPUTIME_ID;
 168                 return (0);
 169         }
 170
 171         switch (l) {
 172         case LINUX_CLOCK_REALTIME:
 173                 *n = CLOCK_REALTIME;
 174                 break;
 175         case LINUX_CLOCK_MONOTONIC:
 176                 *n = CLOCK_MONOTONIC;
 177                 break;
 178         case LINUX_CLOCK_REALTIME_COARSE:
 179                 *n = CLOCK_REALTIME_FAST;
 180                 break;
 181         case LINUX_CLOCK_MONOTONIC_COARSE:
 182                 *n = CLOCK_MONOTONIC_FAST;
 183                 break;
 184         case LINUX_CLOCK_MONOTONIC_RAW:
 185         case LINUX_CLOCK_BOOTTIME:
 186         case LINUX_CLOCK_REALTIME_ALARM:
 187         case LINUX_CLOCK_BOOTTIME_ALARM:
 188         case LINUX_CLOCK_SGI_CYCLE:
 189         case LINUX_CLOCK_TAI:
 190                 LIN_SDT_PROBE1(time, linux_to_native_clockid,
 191                     unsupported_clockid, l);
 192                 LIN_SDT_PROBE1(time, linux_to_native_clockid, return, EINVAL);
 193                 return (EINVAL);
 194         default:
 195                 LIN_SDT_PROBE1(time, linux_to_native_clockid,
 196                     unknown_clockid, l);
 197                 LIN_SDT_PROBE1(time, linux_to_native_clockid, return, EINVAL);
 198                 return (EINVAL);
 199         }
 200
 201         LIN_SDT_PROBE1(time, linux_to_native_clockid, return, 0);
 202         return (0);
 203 }
 204
 205 int
 206 linux_clock_gettime(struct thread *td, struct linux_clock_gettime_args *args)
 207 {
 208         struct l_timespec lts;
 209         struct timespec tp;
 210         struct rusage ru;
 211         struct thread *targettd;
 212         struct proc *p;
 213         int error, clockwhich;
 214         clockid_t nwhich = 0;   /* XXX: GCC */
 215         pid_t pid;
 216         lwpid_t tid;
 217
 218         LIN_SDT_PROBE2(time, linux_clock_gettime, entry, args->which, args->tp);
 219
 220         error = linux_to_native_clockid(&nwhich, args->which);
 221         if (error != 0) {
 222                 LIN_SDT_PROBE1(time, linux_clock_gettime, conversion_error,
 223                     error);
 224                 LIN_SDT_PROBE1(time, linux_clock_gettime, return, error);
 225                 return (error);
 226         }
 227
 228         switch (nwhich) {
 229         case CLOCK_PROCESS_CPUTIME_ID:
 230                 clockwhich = LINUX_CPUCLOCK_WHICH(args->which);
 231                 pid = LINUX_CPUCLOCK_ID(args->which);
 232                 if (pid == 0) {
 233                         p = td->td_proc;
 234                         PROC_LOCK(p);
 235                 } else {
 236                         error = pget(pid, PGET_CANSEE, &p);
 237                         if (error != 0)
 238                                 return (EINVAL);
 239                 }
 240                 switch (clockwhich) {
 241                 case LINUX_CPUCLOCK_PROF:
 242                         PROC_STATLOCK(p);
 243                         calcru(p, &ru.ru_utime, &ru.ru_stime);
 244                         PROC_STATUNLOCK(p);
 245                         PROC_UNLOCK(p);
 246                         timevaladd(&ru.ru_utime, &ru.ru_stime);
 247                         TIMEVAL_TO_TIMESPEC(&ru.ru_utime, &tp);
 248                         break;
 249                 case LINUX_CPUCLOCK_VIRT:
 250                         PROC_STATLOCK(p);
 251                         calcru(p, &ru.ru_utime, &ru.ru_stime);
 252                         PROC_STATUNLOCK(p);
 253                         PROC_UNLOCK(p);
 254                         TIMEVAL_TO_TIMESPEC(&ru.ru_utime, &tp);
 255                         break;
 256                 case LINUX_CPUCLOCK_SCHED:
 257                         PROC_UNLOCK(p);
 258                         error = kern_clock_getcpuclockid2(td, pid,
 259                             CPUCLOCK_WHICH_PID, &nwhich);
 260                         if (error != 0)
 261                                 return (EINVAL);
 262                         error = kern_clock_gettime(td, nwhich, &tp);
 263                         break;
 264                 default:
 265                         PROC_UNLOCK(p);
 266                         return (EINVAL);
 267                 }
 268
 269                 break;
 270
 271         case CLOCK_THREAD_CPUTIME_ID:
 272                 clockwhich = LINUX_CPUCLOCK_WHICH(args->which);
 273                 p = td->td_proc;
 274                 tid = LINUX_CPUCLOCK_ID(args->which);
 275                 if (tid == 0) {
 276                         targettd = td;
 277                         PROC_LOCK(p);
 278                 } else {
 279                         targettd = tdfind(tid, p->p_pid);
 280                         if (targettd == NULL)
 281                                 return (EINVAL);
 282                 }
 283                 switch (clockwhich) {
 284                 case LINUX_CPUCLOCK_PROF:
 285                         PROC_STATLOCK(p);
 286                         thread_lock(targettd);
 287                         rufetchtd(targettd, &ru);
 288                         thread_unlock(targettd);
 289                         PROC_STATUNLOCK(p);
 290                         PROC_UNLOCK(p);
 291                         timevaladd(&ru.ru_utime, &ru.ru_stime);
 292                         TIMEVAL_TO_TIMESPEC(&ru.ru_utime, &tp);
 293                         break;
 294                 case LINUX_CPUCLOCK_VIRT:
 295                         PROC_STATLOCK(p);
 296                         thread_lock(targettd);
 297                         rufetchtd(targettd, &ru);
 298                         thread_unlock(targettd);
 299                         PROC_STATUNLOCK(p);
 300                         PROC_UNLOCK(p);
 301                         TIMEVAL_TO_TIMESPEC(&ru.ru_utime, &tp);
 302                         break;
 303                 case LINUX_CPUCLOCK_SCHED:
 304                         error = kern_clock_getcpuclockid2(td, tid,
 305                             CPUCLOCK_WHICH_TID, &nwhich);
 306                         PROC_UNLOCK(p);
 307                         if (error != 0)
 308                                 return (EINVAL);
 309                         error = kern_clock_gettime(td, nwhich, &tp);
 310                         break;
 311                 default:
 312                         PROC_UNLOCK(p);
 313                         return (EINVAL);
 314                 }
 315                 break;
 316
 317         default:
 318                 error = kern_clock_gettime(td, nwhich, &tp);
 319                 break;
 320         }
 321         if (error != 0) {
 322                 LIN_SDT_PROBE1(time, linux_clock_gettime, gettime_error, error);
 323                 LIN_SDT_PROBE1(time, linux_clock_gettime, return, error);
 324                 return (error);
 325         }
 326         native_to_linux_timespec(&lts, &tp);
 327
 328         error = copyout(&lts, args->tp, sizeof lts);
 329         if (error != 0)
 330                 LIN_SDT_PROBE1(time, linux_clock_gettime, copyout_error, error);
 331
 332         LIN_SDT_PROBE1(time, linux_clock_gettime, return, error);
 333         return (error);
 334 }
 335
 336 int
 337 linux_clock_settime(struct thread *td, struct linux_clock_settime_args *args)
 338 {
 339         struct timespec ts;
 340         struct l_timespec lts;
 341         int error;
 342         clockid_t nwhich = 0;   /* XXX: GCC */
 343
 344         LIN_SDT_PROBE2(time, linux_clock_settime, entry, args->which, args->tp);
 345
 346         error = linux_to_native_clockid(&nwhich, args->which);
 347         if (error != 0) {
 348                 LIN_SDT_PROBE1(time, linux_clock_settime, conversion_error,
 349                     error);
 350                 LIN_SDT_PROBE1(time, linux_clock_settime, return, error);
 351                 return (error);
 352         }
 353         error = copyin(args->tp, &lts, sizeof lts);
 354         if (error != 0) {
 355                 LIN_SDT_PROBE1(time, linux_clock_settime, copyin_error, error);
 356                 LIN_SDT_PROBE1(time, linux_clock_settime, return, error);
 357                 return (error);
 358         }
 359         error = linux_to_native_timespec(&ts, &lts);
 360         if (error != 0) {
 361                 LIN_SDT_PROBE1(time, linux_clock_settime, conversion_error,
 362                     error);
 363                 LIN_SDT_PROBE1(time, linux_clock_settime, return, error);
 364                 return (error);
 365         }
 366
 367         error = kern_clock_settime(td, nwhich, &ts);
 368         if (error != 0)
 369                 LIN_SDT_PROBE1(time, linux_clock_settime, settime_error, error);
 370
 371         LIN_SDT_PROBE1(time, linux_clock_settime, return, error);
 372         return (error);
 373 }
 374
 375 int
 376 linux_clock_getres(struct thread *td, struct linux_clock_getres_args *args)
 377 {
 378         struct proc *p;
 379         struct timespec ts;
 380         struct l_timespec lts;
 381         int error, clockwhich;
 382         clockid_t nwhich = 0;   /* XXX: GCC */
 383         pid_t pid;
 384         lwpid_t tid;
 385
 386         LIN_SDT_PROBE2(time, linux_clock_getres, entry, args->which, args->tp);
 387
 388         error = linux_to_native_clockid(&nwhich, args->which);
 389         if (error != 0) {
 390                 LIN_SDT_PROBE1(time, linux_clock_getres, conversion_error,
 391                     error);
 392                 LIN_SDT_PROBE1(time, linux_clock_getres, return, error);
 393                 return (error);
 394         }
 395
 396         /*
 397          * Check user supplied clock id in case of per-process
 398          * or thread-specific cpu-time clock.
 399          */
 400         switch (nwhich) {
 401         case CLOCK_THREAD_CPUTIME_ID:
 402                 tid = LINUX_CPUCLOCK_ID(args->which);
 403                 if (tid != 0) {
 404                         p = td->td_proc;
 405                         if (tdfind(tid, p->p_pid) == NULL)
 406                                 return (ESRCH);
 407                         PROC_UNLOCK(p);
 408                 }
 409                 break;
 410         case CLOCK_PROCESS_CPUTIME_ID:
 411                 pid = LINUX_CPUCLOCK_ID(args->which);
 412                 if (pid != 0) {
 413                         error = pget(pid, PGET_CANSEE, &p);
 414                         if (error != 0)
 415                                 return (EINVAL);
 416                         PROC_UNLOCK(p);
 417                 }
 418                 break;
 419         }
 420
 421         if (args->tp == NULL) {
 422                 LIN_SDT_PROBE0(time, linux_clock_getres, nullcall);
 423                 LIN_SDT_PROBE1(time, linux_clock_getres, return, 0);
 424                 return (0);
 425         }
 426
 427         switch (nwhich) {
 428         case CLOCK_THREAD_CPUTIME_ID:
 429         case CLOCK_PROCESS_CPUTIME_ID:
 430                 clockwhich = LINUX_CPUCLOCK_WHICH(args->which);
 431                 switch (clockwhich) {
 432                 case LINUX_CPUCLOCK_PROF:
 433                         nwhich = CLOCK_PROF;
 434                         break;
 435                 case LINUX_CPUCLOCK_VIRT:
 436                         nwhich = CLOCK_VIRTUAL;
 437                         break;
 438                 case LINUX_CPUCLOCK_SCHED:
 439                         break;
 440                 default:
 441                         return (EINVAL);
 442                 }
 443                 break;
 444
 445         default:
 446                 break;
 447         }
 448         error = kern_clock_getres(td, nwhich, &ts);
 449         if (error != 0) {
 450                 LIN_SDT_PROBE1(time, linux_clock_getres, getres_error, error);
 451                 LIN_SDT_PROBE1(time, linux_clock_getres, return, error);
 452                 return (error);
 453         }
 454         native_to_linux_timespec(&lts, &ts);
 455
 456         error = copyout(&lts, args->tp, sizeof lts);
 457         if (error != 0)
 458                 LIN_SDT_PROBE1(time, linux_clock_getres, copyout_error, error);
 459
 460         LIN_SDT_PROBE1(time, linux_clock_getres, return, error);
 461         return (error);
 462 }
 463
 464 int
 465 linux_nanosleep(struct thread *td, struct linux_nanosleep_args *args)
 466 {
 467         struct timespec *rmtp;
 468         struct l_timespec lrqts, lrmts;
 469         struct timespec rqts, rmts;
 470         int error, error2;
 471
 472         LIN_SDT_PROBE2(time, linux_nanosleep, entry, args->rqtp, args->rmtp);
 473
 474         error = copyin(args->rqtp, &lrqts, sizeof lrqts);
 475         if (error != 0) {
 476                 LIN_SDT_PROBE1(time, linux_nanosleep, copyin_error, error);
 477                 LIN_SDT_PROBE1(time, linux_nanosleep, return, error);
 478                 return (error);
 479         }
 480
 481         if (args->rmtp != NULL)
 482                 rmtp = &rmts;
 483         else
 484                 rmtp = NULL;
 485
 486         error = linux_to_native_timespec(&rqts, &lrqts);
 487         if (error != 0) {
 488                 LIN_SDT_PROBE1(time, linux_nanosleep, conversion_error, error);
 489                 LIN_SDT_PROBE1(time, linux_nanosleep, return, error);
 490                 return (error);
 491         }
 492         error = kern_nanosleep(td, &rqts, rmtp);
 493         if (args->rmtp != NULL) {
 494                 native_to_linux_timespec(&lrmts, rmtp);
 495                 error2 = copyout(&lrmts, args->rmtp, sizeof(lrmts));
 496                 if (error2 != 0) {
 497                         LIN_SDT_PROBE1(time, linux_nanosleep, copyout_error,
 498                             error2);
 499                         LIN_SDT_PROBE1(time, linux_nanosleep, return, error2);
 500                         return (error2);
 501                 }
 502         }
 503
 504         LIN_SDT_PROBE1(time, linux_nanosleep, return, error);
 505         return (error);
 506 }
 507
 508 int
 509 linux_clock_nanosleep(struct thread *td, struct linux_clock_nanosleep_args *args)
 510 {
 511         struct timespec *rmtp;
 512         struct l_timespec lrqts, lrmts;
 513         struct timespec rqts, rmts;
 514         int error, error2;
 515
 516         LIN_SDT_PROBE4(time, linux_clock_nanosleep, entry, args->which,
 517             args->flags, args->rqtp, args->rmtp);
 518
 519         if (args->flags != 0) {
 520                 /* XXX deal with TIMER_ABSTIME */
 521                 LIN_SDT_PROBE1(time, linux_clock_nanosleep, unsupported_flags,
 522                     args->flags);
 523                 LIN_SDT_PROBE1(time, linux_clock_nanosleep, return, EINVAL);
 524                 return (EINVAL);        /* XXX deal with TIMER_ABSTIME */
 525         }
 526
 527         if (args->which != LINUX_CLOCK_REALTIME) {
 528                 LIN_SDT_PROBE1(time, linux_clock_nanosleep, unsupported_clockid,
 529                     args->which);
 530                 LIN_SDT_PROBE1(time, linux_clock_nanosleep, return, EINVAL);
 531                 return (EINVAL);
 532         }
 533
 534         error = copyin(args->rqtp, &lrqts, sizeof(lrqts));
 535         if (error != 0) {
 536                 LIN_SDT_PROBE1(time, linux_clock_nanosleep, copyin_error,
 537                     error);
 538                 LIN_SDT_PROBE1(time, linux_clock_nanosleep, return, error);
 539                 return (error);
 540         }
 541
 542         if (args->rmtp != NULL)
 543                 rmtp = &rmts;
 544         else
 545                 rmtp = NULL;
 546
 547         error = linux_to_native_timespec(&rqts, &lrqts);
 548         if (error != 0) {
 549                 LIN_SDT_PROBE1(time, linux_clock_nanosleep, conversion_error,
 550                     error);
 551                 LIN_SDT_PROBE1(time, linux_clock_nanosleep, return, error);
 552                 return (error);
 553         }
 554         error = kern_nanosleep(td, &rqts, rmtp);
 555         if (args->rmtp != NULL) {
 556                 /* XXX. Not for TIMER_ABSTIME */
 557                 native_to_linux_timespec(&lrmts, rmtp);
 558                 error2 = copyout(&lrmts, args->rmtp, sizeof(lrmts));
 559                 if (error2 != 0) {
 560                         LIN_SDT_PROBE1(time, linux_clock_nanosleep,
 561                             copyout_error, error2);
 562                         LIN_SDT_PROBE1(time, linux_clock_nanosleep,
 563                             return, error2);
 564                         return (error2);
 565                 }
 566         }
 567
 568         LIN_SDT_PROBE1(time, linux_clock_nanosleep, return, error);
 569         return (error);
 570 }