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      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 }
    109