d1d66eac15
gettimeofday returns the system clock, which may jump forward or back, especially if NTP is in use. If the time jumps backwards, then dd will see negative elapsed time, round it up to 1usec, and print an absurdly fast transfer rate. The solution is to use clock_gettime(2) with CLOCK_MONOTONIC_PRECISE as the clock_id. That clock advances steadily, regardless of changes to the system clock. Reviewed by: delphij MFC after: 3 days Sponsored by: Spectra Logic
108 lines
3.2 KiB
C
108 lines
3.2 KiB
C
/*-
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* Copyright (c) 1991, 1993, 1994
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* The Regents of the University of California. All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* Keith Muller of the University of California, San Diego and Lance
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* Visser of Convex Computer Corporation.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#ifndef lint
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#if 0
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static char sccsid[] = "@(#)misc.c 8.3 (Berkeley) 4/2/94";
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#endif
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#endif /* not lint */
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/types.h>
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#include <err.h>
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#include <errno.h>
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#include <inttypes.h>
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#include <signal.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sysexits.h>
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#include <time.h>
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#include <unistd.h>
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#include "dd.h"
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#include "extern.h"
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void
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summary(void)
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{
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struct timespec tv, tv_res;
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double secs, res;
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if (ddflags & C_NOINFO)
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return;
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if (clock_gettime(CLOCK_MONOTONIC_PRECISE, &tv))
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err(EX_OSERR, "clock_gettime");
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if (clock_getres(CLOCK_MONOTONIC_PRECISE, &tv_res))
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err(EX_OSERR, "clock_getres");
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secs = tv.tv_sec + tv.tv_nsec * 1.0e-9 - st.start;
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res = tv_res.tv_sec + tv_res.tv_nsec * 1.0e-9;
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if (secs < res)
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secs = res;
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(void)fprintf(stderr,
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"%ju+%ju records in\n%ju+%ju records out\n",
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st.in_full, st.in_part, st.out_full, st.out_part);
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if (st.swab)
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(void)fprintf(stderr, "%ju odd length swab %s\n",
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st.swab, (st.swab == 1) ? "block" : "blocks");
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if (st.trunc)
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(void)fprintf(stderr, "%ju truncated %s\n",
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st.trunc, (st.trunc == 1) ? "block" : "blocks");
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if (!(ddflags & C_NOXFER)) {
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(void)fprintf(stderr,
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"%ju bytes transferred in %.9f secs (%.0f bytes/sec)\n",
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st.bytes, secs, st.bytes / secs);
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}
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need_summary = 0;
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}
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/* ARGSUSED */
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void
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siginfo_handler(int signo __unused)
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{
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need_summary = 1;
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}
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/* ARGSUSED */
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void
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terminate(int sig)
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{
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summary();
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_exit(sig == 0 ? 0 : 1);
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}
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