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/* $OpenBSD: gettimeofday.c,v 1.3 1996/07/30 06:46:50 niklas Exp $ */
/* $NetBSD: gettimeofday.c,v 1.1 1995/12/20 12:56:06 cgd Exp $ */
/*
* Copyright (c) 1995 Carnegie-Mellon University.
* All rights reserved.
*
* Author: Chris G. Demetriou
*
* Permission to use, copy, modify and distribute this software and
* its documentation is hereby granted, provided that both the copyright
* notice and this permission notice appear in all copies of the
* software, derivative works or modified versions, and any portions
* thereof, and that both notices appear in supporting documentation.
*
* CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
* CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND
* FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
*
* Carnegie Mellon requests users of this software to return to
*
* Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU
* School of Computer Science
* Carnegie Mellon University
* Pittsburgh PA 15213-3890
*
* any improvements or extensions that they make and grant Carnegie the
* rights to redistribute these changes.
*/
#include <sys/types.h>
#include <sys/fcntl.h>
#include <sys/mman.h>
#include <sys/syscall.h>
#include <machine/sysarch.h>
#include "libalpha.h"
int
gettimeofday(tvp, tzp)
struct timeval *tvp;
struct timezone *tzp;
{
u_long opcc, npcc, pccdiff;
static struct timeval lasttime;
if (tzp == NULL && alpha_mmclockdata == NULL &&
!__alpha_mmclock_init_failed)
alpha_mmclockdata = alpha_mmclock_init();
if (tzp != NULL || alpha_mmclockdata == NULL)
return (syscall(SYS_gettimeofday, tvp, tzp));
if (tvp == NULL)
return 0;
do {
tvp->tv_usec = alpha_mmclockdata->td_tv.tv_usec;
tvp->tv_sec = alpha_mmclockdata->td_tv.tv_sec;
opcc = alpha_mmclockdata->td_cc;
} while (tvp->tv_usec != alpha_mmclockdata->td_tv.tv_usec ||
tvp->tv_sec != alpha_mmclockdata->td_tv.tv_sec);
npcc = rpcc() & 0x00000000ffffffffUL;
if (npcc < opcc)
npcc += 0x0000000100000000UL;
pccdiff = npcc - opcc;
tvp->tv_usec += (pccdiff * 1000000) / alpha_cycles_per_second;
if (tvp->tv_usec > 1000000) {
tvp->tv_sec++;
tvp->tv_usec -= 1000000;
}
if ((tvp->tv_sec == lasttime.tv_sec &&
tvp->tv_usec <= lasttime.tv_usec) &&
(tvp->tv_usec = lasttime.tv_usec + 1) > 1000000) {
tvp->tv_sec++;
tvp->tv_usec -= 1000000;
}
lasttime = *tvp;
return 0;
}
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