NAME
trpt —
transliterate protocol
trace
SYNOPSIS
trpt |
[-a]
[-f]
[-j]
[-p
hex-address]
[-s]
[-t]
[-N
system]
[-M
core] |
DESCRIPTION
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 connection 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
additional 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.
-
-
- -M
core
- Extract values associated with the name list from
core.
-
-
- -N
system
- Extract the name list from system.
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 question.
SYSCTLS
The following sysctls are used by
trpt. The
TCP_DEBUG
kernel option must be enabled.
-
-
net.inet.tcp.debug
- Structure containing TCP sockets information used by
trpt.
-
-
net.inet.tcp.debx
- Number of TCP debug messages.
DIAGNOSTICS
-
-
- no
namelist
- When the image doesn't contain the proper symbols to find
the trace buffer; others which should be self explanatory.
SEE ALSO
netstat(1),
setsockopt(2)
HISTORY
The
trpt command appeared in
4.2BSD.
BUGS
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 here.