trpt - transliterate protocol trace
trpt [-a] [-f] [-j] [-p hex-address] [-s] [-t] [-N system]
trpt interrogates the buffer of TCP trace records created
when a socket
is marked for ``debugging'' (see setsockopt(2)), and prints
description of these records. When no options are supplied,
all the trace records found in the system grouped according
to TCP connection
protocol control block (PCB).
The options are as follows:
-a In addition to the normal output, print the values
of the source
and destination addresses for each packet recorded.
-f Follow the trace as it occurs, waiting a short time
records each time the end of the log is reached.
-j Just give a list of the protocol control block addresses for
which there are trace records.
-p Show only trace records associated with the protocol
block at the given address hex-address.
-s In addition to the normal output, print a detailed
the packet sequencing information.
-t In addition to the normal output, print the values
for all timers
at each point in the trace.
Extract values associated with the name list from
core instead of
the running kernel.
Extract the name list from system instead of the
The recommended use of trpt is as follows. Isolate the
problem and enable
debugging on the socket(s) involved in the connection.
Find the address
of the protocol control blocks associated with the
the -A option to netstat(1). Then run trpt with the -p option, supplying
the associated protocol control block addresses. The -f option can be
used to follow the trace log once the trace is located. If
many sockets using the debugging option, the -j option may
be useful in
checking to see if any trace records are present for the
socket in question.
When the system image doesn't contain the proper
symbols to find
the trace buffer; others which should be self explanatory.
The trpt command appeared in 4.2BSD.
Should also print the data for each input or output, but
this is not
saved in the trace record.
The output format is inscrutable and should be described
OpenBSD 3.6 December 11, 1993
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