NAME
kdump
—
display kernel trace data
SYNOPSIS
kdump |
[-dHlnRTXx ] [-e
emulation] [-f
file] [-m
maxdata] [-p
pid] [-t
[ceinstuxX+ ]] |
DESCRIPTION
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 Epoch).
-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.
FILES
- ktrace.out
- default ktrace dump file
SEE ALSO
HISTORY
The kdump
command appeared in
4.4BSD.