time.c revision 9acbbeaf2a1ffe5c14b244867d427714fab43c5c
/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License (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 2006 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*/
#pragma ident "%Z%%M% %I% %E% SMI"
#include <errno.h>
#include <time.h>
#include <string.h>
#include <strings.h>
#include <sys/times.h>
#include <sys/lx_syscall.h>
#include <sys/lx_misc.h>
/*
* time() - This cannot be passthrough because on Linux a bad buffer will
* set errno to EFAULT, and on Solaris the failure mode is documented
* as "undefined."
*
* (At present, Solaris' time(2) will segmentation fault, as the call
* is simply a libc wrapper atop the time() syscall that will
* dereference the passed pointer if it is non-zero.)
*/
int
lx_time(uintptr_t p1)
{
time_t ret = time((time_t *)0);
if ((ret == (time_t)-1) ||
((p1 != 0) && (uucopy(&ret, (time_t *)p1, sizeof (ret)) != 0)))
return (-errno);
return (ret);
}
/*
* times() - The Linux implementation avoids writing to NULL, while Solaris
* returns EFAULT.
*/
int
lx_times(uintptr_t p1)
{
clock_t ret;
struct tms buf, *tp = (struct tms *)p1;
ret = times(&buf);
if ((ret == -1) ||
((tp != NULL) && uucopy((void *)&buf, tp, sizeof (buf)) != 0))
return (-errno);
return ((ret == -1) ? -errno : ret);
}
/*
* setitimer() - the Linux implementation can handle tv_usec values greater
* than 1,000,000 where Solaris would return EINVAL.
*
* There's still an issue here where Linux can handle a
* tv_sec value greater than 100,000,000 but Solaris cannot,
* but that would also mean setting an interval timer to fire
* over _three years_ in the future so it's unlikely anything
* other than Linux test suites will trip over it.
*/
int
lx_setitimer(uintptr_t p1, uintptr_t p2, uintptr_t p3)
{
struct itimerval itv;
struct itimerval *itp = (struct itimerval *)p2;
if (itp != NULL) {
if (uucopy(itp, &itv, sizeof (itv)) != 0)
return (-errno);
/*
* Adjust any tv_usec fields >= 1,000,000 by adding any whole
* seconds so indicated to tv_sec and leaving tv_usec as the
* remainder.
*/
if (itv.it_interval.tv_usec >= MICROSEC) {
itv.it_interval.tv_sec +=
itv.it_interval.tv_usec / MICROSEC;
itv.it_interval.tv_usec %= MICROSEC;
}
if (itv.it_value.tv_usec >= MICROSEC) {
itv.it_value.tv_sec +=
itv.it_value.tv_usec / MICROSEC;
itv.it_value.tv_usec %= MICROSEC;
}
itp = &itv;
}
return ((setitimer((int)p1, itp, (struct itimerval *)p3) != 0) ?
-errno : 0);
}
/*
* NOTE: The Linux man pages state this structure is obsolete and is
* unsupported, so it is declared here for sizing purposes only.
*/
struct lx_timezone {
int tz_minuteswest; /* minutes W of Greenwich */
int tz_dsttime; /* type of dst correction */
};
/*
* lx_gettimeofday() and lx_settimeofday() are implemented here rather than
* as pass-through calls to Solaris' libc due to the need to return EFAULT
* for a bad buffer rather than die with a segmentation fault.
*/
int
lx_gettimeofday(uintptr_t p1, uintptr_t p2)
{
struct timeval tv;
struct lx_timezone tz;
bzero(&tz, sizeof (tz));
(void) gettimeofday(&tv, NULL);
if ((p1 != NULL) &&
(uucopy(&tv, (struct timeval *)p1, sizeof (tv)) < 0))
return (-errno);
/*
* The Linux man page states use of the second parameter is obsolete,
* but gettimeofday(2) should still return EFAULT if it is set
* to a bad non-NULL pointer (sigh...)
*/
if ((p2 != NULL) &&
(uucopy(&tz, (struct lx_timezone *)p2, sizeof (tz)) < 0))
return (-errno);
return (0);
}
int
lx_settimeofday(uintptr_t p1, uintptr_t p2)
{
struct timeval tv;
struct lx_timezone tz;
if ((p1 != NULL) &&
(uucopy((struct timeval *)p1, &tv, sizeof (tv)) < 0))
return (-errno);
/*
* The Linux man page states use of the second parameter is obsolete,
* but settimeofday(2) should still return EFAULT if it is set
* to a bad non-NULL pointer (sigh...)
*/
if ((p2 != NULL) &&
(uucopy((struct lx_timezone *)p2, &tz, sizeof (tz)) < 0))
return (-errno);
if ((p1 != NULL) && (settimeofday(&tv, NULL) < 0))
return (-errno);
return (0);
}