145 lines
3.4 KiB
C
145 lines
3.4 KiB
C
/* timeval.c - functions to perform operations on struct timevals */
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/* Copyright (C) 1999 Free Software Foundation, Inc.
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This file is part of GNU Bash, the Bourne Again SHell.
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Bash is free software; you can redistribute it and/or modify it under
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the terms of the GNU General Public License as published by the Free
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Software Foundation; either version 2, or (at your option) any later
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version.
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Bash is distributed in the hope that it will be useful, but WITHOUT ANY
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WARRANTY; without even the implied warranty of MERCHANTABILITY or
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FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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for more details.
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You should have received a copy of the GNU General Public License along
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with Bash; see the file COPYING. If not, write to the Free Software
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Foundation, 59 Temple Place, Suite 330, Boston, MA 02111 USA. */
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#include <config.h>
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#if defined (HAVE_TIMEVAL)
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#include <sys/types.h>
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#include <posixtime.h>
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#include <stdio.h>
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struct timeval *
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difftimeval (d, t1, t2)
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struct timeval *d, *t1, *t2;
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{
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d->tv_sec = t2->tv_sec - t1->tv_sec;
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d->tv_usec = t2->tv_usec - t1->tv_usec;
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if (d->tv_usec < 0)
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{
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d->tv_usec += 1000000;
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d->tv_sec -= 1;
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if (d->tv_sec < 0) /* ??? -- BSD/OS does this */
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{
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d->tv_sec = 0;
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d->tv_usec = 0;
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}
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}
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return d;
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}
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struct timeval *
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addtimeval (d, t1, t2)
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struct timeval *d, *t1, *t2;
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{
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d->tv_sec = t1->tv_sec + t2->tv_sec;
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d->tv_usec = t1->tv_usec + t2->tv_usec;
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if (d->tv_usec >= 1000000)
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{
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d->tv_usec -= 1000000;
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d->tv_sec += 1;
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}
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return d;
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}
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/* Do "cpu = ((user + sys) * 10000) / real;" with timevals.
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Barely-tested code from Deven T. Corzine <deven@ties.org>. */
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int
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timeval_to_cpu (rt, ut, st)
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struct timeval *rt, *ut, *st; /* real, user, sys */
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{
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struct timeval t1, t2;
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register int i;
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addtimeval (&t1, ut, st);
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t2.tv_sec = rt->tv_sec;
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t2.tv_usec = rt->tv_usec;
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for (i = 0; i < 6; i++)
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{
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if ((t1.tv_sec > 99999999) || (t2.tv_sec > 99999999))
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break;
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t1.tv_sec *= 10;
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t1.tv_sec += t1.tv_usec / 100000;
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t1.tv_usec *= 10;
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t1.tv_usec %= 1000000;
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t2.tv_sec *= 10;
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t2.tv_sec += t2.tv_usec / 100000;
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t2.tv_usec *= 10;
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t2.tv_usec %= 1000000;
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}
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for (i = 0; i < 4; i++)
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{
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if (t1.tv_sec < 100000000)
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t1.tv_sec *= 10;
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else
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t2.tv_sec /= 10;
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}
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return ((t2.tv_sec == 0) ? 0 : t1.tv_sec / t2.tv_sec);
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}
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/* Convert a pointer to a struct timeval to seconds and thousandths of a
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second, returning the values in *SP and *SFP, respectively. This does
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rounding on the fractional part, not just truncation to three places. */
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void
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timeval_to_secs (tvp, sp, sfp)
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struct timeval *tvp;
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time_t *sp;
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int *sfp;
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{
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int rest;
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*sp = tvp->tv_sec;
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*sfp = tvp->tv_usec % 1000000; /* pretty much a no-op */
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rest = *sfp % 1000;
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*sfp = (*sfp * 1000) / 1000000;
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if (rest >= 500)
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*sfp += 1;
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/* Sanity check */
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if (*sfp >= 1000)
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{
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*sp += 1;
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*sfp -= 1000;
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}
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}
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/* Print the contents of a struct timeval * in a standard way to stdio
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stream FP. */
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void
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print_timeval (fp, tvp)
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FILE *fp;
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struct timeval *tvp;
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{
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time_t timestamp;
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long minutes;
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int seconds, seconds_fraction;
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timeval_to_secs (tvp, ×tamp, &seconds_fraction);
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minutes = timestamp / 60;
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seconds = timestamp % 60;
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fprintf (fp, "%ldm%d.%03ds", minutes, seconds, seconds_fraction);
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}
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#endif /* HAVE_TIMEVAL */
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