TRPT(8) BSD System Manager's Manual TRPT(8)NAMEtrpt — transliterate protocol trace
SYNOPSIStrpt [-a] [-f] [-j] [-p hex-address] [-s] [-t] [system [core]]
Trpt interrogates the buffer of TCP trace records created when a socket
is marked for “debugging” (see setsockopt(2)), and prints a readable
description of these records. When no options are supplied, trpt prints
all the trace records found in the system grouped according to TCP con‐
nection protocol control block (PCB). The following options may be used
to alter this behavior.
-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 for addi‐
tional 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 control
block at the given address hex-address.
-s In addition to the normal output, print a detailed description of
the packet sequencing information.
-t in addition to the normal output, print the values for all timers
at each point in the trace.
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 sockets using
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 there are
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 ques‐
If debugging is being performed on a system or core file other than the
default, the last two arguments may be used to supplant the defaults.
SEE ALSOnetstat(1), setsockopt(2), trsp(8)DIAGNOSTICS
When the system image doesn't contain the proper symbols to find
the trace buffer; others which should be self explanatory.
Should also print the data for each input or output, but this is not
saved in the race record.
The output format is inscrutable and should be described here.
The trpt command appeared in 4.2BSD.
4.2 Berkeley Distribution December 11, 1993 4.2 Berkeley Distribution