kernel/syscall/adjtime.c

   1 /*
   2  * CDDL HEADER START
   3  *
   4  * The contents of this file are subject to the terms of the
   5  * Common Development and Distribution License, Version 1.0 only
   6  * (the "License").  You may not use this file except in compliance
   7  * with the License.
   8  *
   9  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
  10  * or http://www.opensolaris.org/os/licensing.
  11  * See the License for the specific language governing permissions
  12  * and limitations under the License.
  13  *
  14  * When distributing Covered Code, include this CDDL HEADER in each
  15  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
  16  * If applicable, add the following below this CDDL HEADER, with the
  17  * fields enclosed by brackets "[]" replaced with your own identifying
  18  * information: Portions Copyright [yyyy] [name of copyright owner]
  19  *
  20  * CDDL HEADER END
  21  */
  22 /*      Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T */
  23 /*        All Rights Reserved   */
  24
  25
  26 /*
  27  * Copyright 1999,2001-2003 Sun Microsystems, Inc.  All rights reserved.
  28  * Use is subject to license terms.
  29  */
  30
  31 #pragma ident   "%Z%%M% %I%     %E% SMI"        /* from SVr4.0 1.78 */
  32
  33 #include <sys/param.h>
  34 #include <sys/types.h>
  35 #include <sys/sysmacros.h>
  36 #include <sys/systm.h>
  37 #include <sys/tuneable.h>
  38 #include <sys/errno.h>
  39 #include <sys/proc.h>
  40 #include <sys/time.h>
  41 #include <sys/debug.h>
  42 #include <sys/model.h>
  43 #include <sys/policy.h>
  44
  45 int
  46 adjtime(struct timeval *delta, struct timeval *olddelta)
  47 {
  48         struct timeval atv, oatv;
  49         int64_t ndelta;
  50         int64_t old_delta;
  51         int s;
  52         model_t datamodel = get_udatamodel();
  53
  54         if (secpolicy_settime(CRED()) != 0)
  55                 return (set_errno(EPERM));
  56
  57         if (datamodel == DATAMODEL_NATIVE) {
  58                 if (copyin(delta, &atv, sizeof (atv)))
  59                         return (set_errno(EFAULT));
  60         } else {
  61                 struct timeval32 atv32;
  62
  63                 if (copyin(delta, &atv32, sizeof (atv32)))
  64                         return (set_errno(EFAULT));
  65                 TIMEVAL32_TO_TIMEVAL(&atv, &atv32);
  66         }
  67
  68         if (atv.tv_usec <= -MICROSEC || atv.tv_usec >= MICROSEC)
  69                 return (set_errno(EINVAL));
  70
  71         /*
  72          * The SVID specifies that if delta is 0, then there is
  73          * no effect upon time correction, just return olddelta.
  74          */
  75         ndelta = (int64_t)atv.tv_sec * NANOSEC + atv.tv_usec * 1000;
  76         mutex_enter(&tod_lock);
  77         s = hr_clock_lock();
  78         old_delta = timedelta;
  79         if (ndelta)
  80                 timedelta = ndelta;
  81         /*
  82          * Always set tod_needsync on all adjtime() calls, since it implies
  83          * someone is watching over us and keeping the local clock in sync.
  84          */
  85         tod_needsync = 1;
  86         hr_clock_unlock(s);
  87         mutex_exit(&tod_lock);
  88
  89         if (olddelta) {
  90                 oatv.tv_sec = old_delta / NANOSEC;
  91                 oatv.tv_usec = (old_delta % NANOSEC) / 1000;
  92                 if (datamodel == DATAMODEL_NATIVE) {
  93                         if (copyout(&oatv, olddelta, sizeof (oatv)))
  94                                 return (set_errno(EFAULT));
  95                 } else {
  96                         struct timeval32 oatv32;
  97
  98                         if (TIMEVAL_OVERFLOW(&oatv))
  99                                 return (set_errno(EOVERFLOW));
 100
 101                         TIMEVAL_TO_TIMEVAL32(&oatv32, &oatv);
 102
 103                         if (copyout(&oatv32, olddelta, sizeof (oatv32)))
 104                                 return (set_errno(EFAULT));
 105                 }
 106         }
 107         return (0);
 108 }