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From 3699eaccf3e0833604d74fcd483152972721869a Mon Sep 17 00:00:00 2001
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From: Guy Harris <guy@alum.mit.edu>
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Date: Wed, 25 Jun 2014 11:45:29 -0700
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Subject: [PATCH 2/4] Give more details for --time-stamp-precision.
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(cherry picked from commit e76768c97a70934b8f3a41fe2df705c61a924a47)
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[msekleta: replaced .LP with .IP to fix indentation of paragraphs]
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---
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tcpdump.1.in | 24 +++++++++++++++++-------
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1 file changed, 17 insertions(+), 7 deletions(-)
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diff --git a/tcpdump.1.in b/tcpdump.1.in
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index 6083474..4f0648c 100644
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--- a/tcpdump.1.in
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+++ b/tcpdump.1.in
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@@ -400,13 +400,23 @@ time stamp type cannot be set for the interface, no time stamp types are
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listed.
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.TP
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.BI \-\-time\-stamp\-precision= tstamp_precision
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-.PD
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-Set the time stamp precision for the capture to
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-\fItstamp_precision\fP. Currently supported are microseconds and
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-nanoseconds. Note that availability of high precision time stamps (nanoseconds)
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-and their actual accuracy is platform and HW dependent. Also note that when
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-writing captures to the savefile, distinct magic number is used to distinguish
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-savefiles which contains time stamps in nanoseconds.
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+When capturing, set the time stamp precision for the capture to
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+\fItstamp_precision\fP. Note that availability of high precision time
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+stamps (nanoseconds) and their actual accuracy is platform and hardware
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+dependent. Also note that when writing captures made with nanosecond
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+accuracy to a savefile, the time stamps are written with nanosecond
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+resolution, and the file is written with a different magic number, to
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+indicate that the time stamps are in seconds and nanoseconds; not all
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+programs that read pcap savefiles will be able to read those captures.
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+.IP
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+When reading a savefile, convert time stamps to the precision specified
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+by \fItimestamp_precision\fP, and display them with that resolution. If
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+the precision specified is less than the precision of time stamps in the
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+file, the conversion will lose precision.
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+.IP
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+The supported values for \fItimestamp_precision\fP are \fBmicro\fP for
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+microsecond resolution and \fBnano\fP for nanosecond resolution. The
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+default is microsecond resolution.
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.TP
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.B \-K
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Don't attempt to verify IP, TCP, or UDP checksums. This is useful for
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--
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2.4.3
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