common/syscall/adjtime.c

	adjtime.c revision 7c478bd95313f5f23a4c958a745db2134aa03244
/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License, Version 1.0 only
 * (the "License").  You may not use this file except in compliance
 * with the License.
 *
 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
 * or http://www.opensolaris.org/os/licensing.
 * See the License for the specific language governing permissions
 * and limitations under the License.
 *
 * When distributing Covered Code, include this CDDL HEADER in each
 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
 * If applicable, add the following below this CDDL HEADER, with the
 * fields enclosed by brackets "[]" replaced with your own identifying
 * information: Portions Copyright [yyyy] [name of copyright owner]
 *
 * CDDL HEADER END
 */
/*  Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T */
/*    All Rights Reserved   */


/*
 * Copyright 1999,2001-2003 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */

#pragma ident   "%Z%%M% %I% %E% SMI"    /* from SVr4.0 1.78 */

#include <sys/param.h>
#include <sys/types.h>
#include <sys/sysmacros.h>
#include <sys/systm.h>
#include <sys/tuneable.h>
#include <sys/errno.h>
#include <sys/proc.h>
#include <sys/time.h>
#include <sys/debug.h>
#include <sys/model.h>
#include <sys/policy.h>

int
adjtime(struct timeval *delta, struct timeval *olddelta)
{
    struct timeval atv, oatv;
    int64_t ndelta;
    int64_t old_delta;
    int s;
    model_t datamodel = get_udatamodel();

    if (secpolicy_settime(CRED()) != 0)
        return (set_errno(EPERM));

    if (datamodel == DATAMODEL_NATIVE) {
        if (copyin(delta, &atv, sizeof (atv)))
            return (set_errno(EFAULT));
    } else {
        struct timeval32 atv32;

        if (copyin(delta, &atv32, sizeof (atv32)))
            return (set_errno(EFAULT));
        TIMEVAL32_TO_TIMEVAL(&atv, &atv32);
    }

    if (atv.tv_usec <= -MICROSEC || atv.tv_usec >= MICROSEC)
        return (set_errno(EINVAL));

    /*
     * The SVID specifies that if delta is 0, then there is
     * no effect upon time correction, just return olddelta.
     */
    ndelta = (int64_t)atv.tv_sec * NANOSEC + atv.tv_usec * 1000;
    mutex_enter(&tod_lock);
    s = hr_clock_lock();
    old_delta = timedelta;
    if (ndelta)
        timedelta = ndelta;
    /*
     * Always set tod_needsync on all adjtime() calls, since it implies
     * someone is watching over us and keeping the local clock in sync.
     */
    tod_needsync = 1;
    hr_clock_unlock(s);
    mutex_exit(&tod_lock);

    if (olddelta) {
        oatv.tv_sec = old_delta / NANOSEC;
        oatv.tv_usec = (old_delta % NANOSEC) / 1000;
        if (datamodel == DATAMODEL_NATIVE) {
            if (copyout(&oatv, olddelta, sizeof (oatv)))
                return (set_errno(EFAULT));
        } else {
            struct timeval32 oatv32;

            if (TIMEVAL_OVERFLOW(&oatv))
                return (set_errno(EOVERFLOW));

            TIMEVAL_TO_TIMEVAL32(&oatv32, &oatv);

            if (copyout(&oatv32, olddelta, sizeof (oatv32)))
                return (set_errno(EFAULT));
        }
    }
    return (0);
}