02-12-2012
Debugging Linux Kernel Modules
I am aware of debugging linux applications using gdb and ddd.
Now I have written a simple kernel module having init_module, exit _module and some functions for tasklets and workqueues.
I want to debug these kernel modules like I used to debug applications setting breakpoints etc.
How can I debug linux kernel modules?
How to attach gdb to the modules and how to set breakpoints in them?
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LEARN ABOUT CENTOS
utmpdump
UTMPDUMP(1) System Administration UTMPDUMP(1)
NAME
utmpdump - dump UTMP and WTMP files in raw format
SYNOPSIS
utmpdump [-frh] [ filename ]
DESCRIPTION
utmpdump is a simple program to dump UTMP and WTMP files in raw format, so they can be examined. utmpdump eads from stdin unless a file-
name is passed.
OPTIONS
-f, --follow
Output appended data as the file grows.
-r, --reverse
Undump, write back edited login information into utmp or wtmp files.
-h, --help
Print a help text and exit.
-V, --version
Output version information and exit.
NOTES
utmpdump can be useful in cases of corrupted utmp or wtmp entries. It can dump out utmp/wtmp to an ASCII file, then that file can be
edited to remove bogus entries and reintegrated, using
utmpdump -r < ascii_file > wtmp
but be warned as utmpdump was written for debugging purpose only.
BUGS
You may not use the option -r as the format for the utmp/wtmp files strongly depends on the input format. This tool was not written for
normal use but for debugging.
AUTHOR
Michael Krapp
SEE ALSO
last(1), w(1), who(1), utmp(5)
AVAILABILITY
The utmpdump command is part of the util-linux package and is available from Linux Kernel Archive <ftp://ftp.kernel.org/pub/linux/utils
/util-linux/>.
util-linux July 2012 UTMPDUMP(1)