kdump(1) | OpenBSDHandbook

KDUMP(1) General Commands Manual KDUMP(1)

SYNOPSIS

kdump [-dHlnRTXx] [-f file] [-m maxdata] [-P program] [-p pid] [-t trstr] [-u label]

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.

-f file

Display the specified file instead of ktrace.out. Specifying ‘-’ will read from standard input.

-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 program

Show output only for processes with program as their command name.

-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).

-TR

If both options are specified, display timestamps relative to trace start.

-t trstr

Select which tracepoints to display. The argument can contain one or more of the following letters. By default all trace points except for X are enabled.

c: trace system calls
i: trace I/O
n: trace namei translations
p: trace violation of pledge(2) restrictions
s: trace signal processing
S: trace violation of pinsyscalls(2)
t: trace various structures
u: trace user data coming from utrace(2)
x: trace argument vector in execve(2)
X: trace environment in execve(2)
+: trace the default points

-u label