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\"     @(#)trpt.8       8.2 (Berkeley) 12/11/93
\"
Dd August 30, 2007
Dt TRPT 8
Os
Sh NAME
Nm trpt
Nd transliterate protocol trace
Sh SYNOPSIS
Nm
Op Fl a
Op Fl f
Op Fl j
Op Fl p Ar hex-address
Op Fl s
Op Fl t
Op Fl N Ar system
Op Fl M Ar core
Sh DESCRIPTION
Nm
interrogates the buffer of
Tn TCP
trace records created
when a socket is marked for
Dq debugging
(see
Xr setsockopt 2 ) ,
and prints a readable description of these records.
When no options are supplied,
Nm
prints all the trace records found in the system
grouped according to
Tn TCP
connection protocol control
block
Pq Tn PCB .
The following options may be used to
alter this behavior.
Bl -tag -width Ds
It Fl a
In addition to the normal output,
print the values of the source and destination
addresses for each packet recorded.
It Fl f
Follow the trace as it occurs, waiting a short time for additional records
each time the end of the log is reached.
It Fl j
Just give a list of the protocol control block
addresses for which there are trace records.
It Fl p
Show only trace records associated with the protocol
control block at the given address
Ar hex-address .
It Fl s
In addition to the normal output,
print a detailed description of the packet
sequencing information.
It Fl t
in addition to the normal output,
print the values for all timers at each
point in the trace.
It Fl M Ar core
Extract values associated with the name list from
Pa core .
It Fl N Ar system
Extract the name list from
Pa system .
El
Pp
The recommended use of
Nm
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
Fl A
option to
Xr netstat 1 .
Then run
Nm
with the
Fl p
option, supplying the associated
protocol control block addresses.
The
Fl 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
Fl j
option may be useful in checking to see if
any trace records are present for the socket in
question.
Sh SYSCTLS
The following sysctls are used by
Nm .
The
Dv TCP_DEBUG
kernel option must be enabled.
Pp
Bl -tag -width "XnetXinetXtcpXdebugXX"
It Li net.inet.tcp.debug
Structure containing TCP sockets information used by
Nm .
It Li net.inet.tcp.debx
Number of TCP debug messages.
El
Sh DIAGNOSTICS
Bl -tag -width Ds
It Sy no namelist
When the image doesn't
contain the proper symbols to find the trace buffer;
others which should be self explanatory.
El
Sh SEE ALSO
Xr netstat 1 ,
Xr setsockopt 2
Sh HISTORY
The
Nm
command appeared in
Bx 4.2 .
Sh BUGS
Should also print the data for each input or output,
but this is not saved in the trace record.
Pp
The output format is inscrutable and should be described
here.

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