KDUMP(1)                    General Commands Manual                   KDUMP(1)


     kdump - display kernel trace data


     kdump [-dHlnRTXx] [-e emulation] [-f file] [-m maxdata] [-p pid]
           [-t [ceinstuxX+]]


     kdump displays the kernel trace files produced with ktrace(1) in human-
     readable format.  By default, the file ktrace.out in the current
     directory is displayed, unless overridden by the -f option.

     The options are as follows:

     -d      Display all numbers in decimal.  By default, values are printed
             out in hexadecimal.

     -e emulation
             Interpret system call maps assuming the named emulation instead
             of "bsd".  For example, to view trace output from a Linux binary,
             use -e linux.

     -f file
             Display the specified file instead of ktrace.out.

     -H      Display thread identifiers.

     -l      Loop reading the trace file, once the end-of-file is reached,
             waiting for more data.

     -m maxdata
             Display at most maxdata bytes when decoding I/O.

     -n      Suppress ad hoc translations.  Normally kdump tries to decode
             many system calls into a more human-readable format.  For
             example, ioctl(2) values are replaced with the macro name and
             errno values are replaced with the strerror(3) string.
             Suppressing this feature yields a more consistent output format
             and is easily amenable to further processing.

     -p pid  Show output only for the pid specified.

     -R      Display relative timestamps (time since previous entry).

     -T      Display absolute timestamps for each entry (seconds since the

     -t [ceinstuxX+]
             Selects which tracepoints to display.  See the -t option of
             ktrace(1) for the definitions of the flags.

     -X      Display I/O data with hexadecimal data and printable ASCII
             characters side by side.

     -x      Display I/O data in hexadecimal.


     ktrace.out  default ktrace dump file




     The kdump command appeared in 4.4BSD.

OpenBSD 5.9                     October 2, 2015                    OpenBSD 5.9

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