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