freebsd-skq/usr.sbin/trpt/trpt.8

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.\" Copyright (c) 1983, 1991, 1993
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.\" @(#)trpt.8 8.2 (Berkeley) 12/11/93
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.\" $FreeBSD$
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.\"
.Dd December 11, 1993
.Dt TRPT 8
.Os
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.Sh NAME
.Nm trpt
.Nd transliterate protocol trace
.Sh SYNOPSIS
.Nm
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.Op Fl a
.Op Fl f
.Op Fl j
.Op Fl p Ar hex-address
.Op Fl s
.Op Fl t
.Oo
.Ar system Op Ar core
.Oc
.Sh DESCRIPTION
.Nm Trpt
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.
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When no options are supplied,
.Nm
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prints all the trace records found in the system
grouped according to
.Tn TCP
connection protocol control
block
.Pq Tn PCB .
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.Pp
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The following options may be used to
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alter this behavior:
.Bl -tag -width indent
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.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,
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print the values for all timers at each
point in the trace.
.El
.Pp
The recommended use of
.Nm
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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
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associated with the sockets using the
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.Fl A
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option to
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.Xr netstat 1 .
Then run
.Nm
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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.
.Pp
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.
.Sh FILES
.Bl -tag -width /boot/kernel/kernel -compact
.It Pa /boot/kernel/kernel
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.It Pa /dev/kmem
.El
.Sh SEE ALSO
.Xr netstat 1 ,
.Xr setsockopt 2
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.Sh DIAGNOSTICS
.Bl -diag
.It no namelist
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When the system image doesn't
contain the proper symbols to find the trace buffer;
others which should be self explanatory.
.El
.Sh BUGS
Should also print the data for each input or output,
but this is not saved in the trace record.
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.Pp
The output format is inscrutable and should be described
here.
.Sh HISTORY
The
.Nm
command appeared in
.Bx 4.2 .