TRPT(8C)TRPT(8C)NAME
trpt - transliterate protocol trace
SYNOPSIS
trpt [ -a ] [ -s ] [ -t ] [ -f ] [ -j ] [ -p hex-address ] [ system [ core ] ]
DESCRIPTION
Trpt interrogates the buffer of TCP trace records created when a socket is marked for "debugging" (see setsockopt(2)), and prints a read-
able 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.
-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.
-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, the address of which follows.
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. The
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.
FILES
/vmunix
/dev/kmem
SEE ALSO setsockopt(2), netstat(1), trsp(8C)DIAGNOSTICS
``no namelist'' when the system image doesn't contain the proper symbols to find the trace buffer; others which should be self explanatory.
BUGS
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.
4.2 Berkeley Distribution May 26, 1986 TRPT(8C)
Check Out this Related Man Page
KTRACE(1) BSD General Commands Manual KTRACE(1)NAME
ktrace, ktruss -- enable kernel process tracing
SYNOPSIS
ktrace [-aCcdins] [-f trfile] [-g pgrp] [-p pid] [-t trstr]
ktrace [-adis] [-f trfile] [-t trstr] command
ktruss [-aCcdilnRT] [-e emulation] [-f infile] [-g pgrp] [-m maxdata] [-o outfile] [-p pid] [-t trstr]
ktruss [-adinRT] [-e emulation] [-m maxdata] [-o outfile] [-t trstr] [-v vers] command
DESCRIPTION
ktrace enables kernel trace logging for the specified processes. Kernel trace data is logged to the file ktrace.out. The kernel operations
that are traced include system calls, namei translations, signal processing, and I/O.
Once tracing is enabled on a process, trace data will be logged until either the process exits or the trace point is cleared. A traced
process can generate enormous amounts of log data quickly; It is strongly suggested that users memorize how to disable tracing before
attempting to trace a process. The following command is sufficient to disable tracing on all user owned processes, and, if executed by root,
all processes:
$ ktrace -C
The trace file is not human readable; use kdump(1) to decode it.
ktruss is functionally the same as ktrace except that trace output is printed on standard output or to the file specified with the -o option.
ktruss is useful to see the kernel operations interleaved with the program output.
The options are as follows:
-a Append to the trace file instead of truncating it.
-C Disable tracing on all user owned processes, and, if executed by root, all processes in the system.
-c Clear the trace points associated with the specified file or processes.
-d Descendants; perform the operation for all current children of the designated processes.
-f trfile
Log trace records to trfile instead of ktrace.out.
-f infile
Read the trace records from infile and print them in a human readable format to standard out.
-g pgid
Enable (disable) tracing on all processes in the process group (only one -g flag is permitted).
-i Inherit; pass the trace flags to all future children of the designated processes.
-l Poll the trace file for new data and print it to standard out. Only for use together with the -f option.
-m maxdata
Print at most maxdata bytes of data. This is used for pointer type arguments, e.g., strings. The data will be escaped in C-style
unless -x is specified when it will be output in hex and ascii.
-n Stop tracing if attempts to write to the trace file would block. This option always affects ktruss and only affects ktrace when
writing to stdout. If this flag is not set, then the traced program will block until it can write more data to the trace file
descriptor.
-o outfile
Log trace records to outfile. Without this option ktruss will print its output in a human readable format to standard out.
-p pid Enable (disable) tracing on the indicated process id (only one -p flag is permitted).
-s Write to the trace file with synchronized I/O.
-R Display relative time stamps to output.
-T Same as the -R option, but use absolute timestamps instead.
-t trstr
The string argument represents the kernel trace points, one per letter. The following table equates the letters with the trace-
points:
A trace all tracepoints
a trace exec arguments
c trace system calls
e trace emulation changes
f trace open file descriptors after exec
i trace I/O
n trace namei translations
S trace MIB access (sysctl)
s trace signal processing
u trace user data
v trace exec environment
w trace context switches
+ trace the default set of trace points (c, e, i, l, m, n, s, u)
- do not trace following trace points
-e emulation
If an emulation of a process is unknown, interpret system call maps assuming the named emulation instead of default "netbsd".
command
Execute command with the specified trace flags.
-v version
Determines the version of the file generated. Version 0 is the compatible ktrace format, and version 1 is the new format with lwp
IDs and nanosecond (instead of microsecond) timestamps.
The -p, -g, and command options are mutually exclusive. The -R and -T options are also mutually exclusive.
EXAMPLES
# trace all kernel operations of process id 34
$ ktrace -p 34
# trace all kernel operations of processes in process group 15 and
# pass the trace flags to all current and future children
$ ktrace -idg 15
# disable all tracing of process 65
$ ktrace -cp 65
# disable tracing signals on process 70 and all current children
$ ktrace -t s -cdp 70
# enable tracing of I/O on process 67
$ ktrace -ti -p 67
# run the command "w", tracing only system calls
$ ktrace -tc w
# disable all tracing to the file "tracedata"
$ ktrace -c -f tracedata
# disable tracing of all processes owned by the user
$ ktrace -C
# run the command "w", displaying to standard output
$ ktruss w
# trace process 42 and log the records to "ktruss.out"
$ ktruss -p 42 -o ktruss.out
# poll ktruss.out for available records and print them
$ ktruss -lf ktruss.out
SEE ALSO kdump(1), ktrace(2)HISTORY
The ktrace command appears in 4.4BSD.
BSD June 1, 2011 BSD