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