idbg(1M) idbg(1M)
idbg - kernel debugger print utility
idbg [ -r file ]
idbg allows the superuser to invoke a number of internal kernel routines
that provide useful debugging information. The -r option provides a
record of the output to the given file. The kernel routines are part of
the idbg kernel module, which can be either dynamically loaded or
statically configured into the kernel.
The ml command can be used to dynamically load the idbg.o module into a
running kernel without reconfiguring and rebooting the kernel:
ml ld -i /var/sysgen/boot/idbg.o -p idbg
Note that functional pieces of the idbg.o module have been broken into
separate modules, such as xfsidbg.o, xlvidbg.o, and so on. It may be
necessary to also include these modules when either statically
configuring idbg.o into the kernel or dynamically loading it, depending
on your kernel configuration. For example:
ml ld -i /var/sysgen/boot/idbg.o -p idbg
ml ld -i /var/sysgen/boot/xfsidbg.o -p xfsidbg
ml ld -i /var/sysgen/boot/xlvidbg.o -p xlvidbg
Statically configuring the idbg.o module into the kernel involves editing
of the /var/sysgen/system/irix.sm file; see the comments in this file on
how to do so. See lboot(1M) for details on reconfiguring the kernel.
See ml(1M) and mload(4) for details about dynamically loadable kernel
modules.
A list of the routines available is displayed by simply typing a carriage
return at the idbg> prompt. A more verbose listing can be obtained by
typing ?? at the prompt. A routine is invoked by simply typing its name,
followed by an optional argument. This list is highly subject to change
from release to release. A few of the current routines available are
described below.
plist [ pid ] If no pid is given, a list of currently active
processes is displayed, including the process
slot number, pid, name, and status. If a pid
is given, the process table slot number is
output. The value is useful as an argument
for other routines.
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idbg(1M) idbg(1M)
ubt process_slot_number A kernel stack backtrace for the given process
is output. This backtrace is not valid for
runnable/running processes.
proc process_slot_number Gives a more complete printout of the process
table entry for the given process.
user process_slot_number Gives a printout of the user area
corresponding to the given process.
kernel debugger not configured
The operating system debugger module idbg is not included in the
running kernel.
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