Managing and Developing Dynamically Loadable Kernel Modules

Managing Dynamically Loadable Kernel Modules

Chapter 12516

functions accessed through the module’s wrapper code

To load a dynamically conﬁgured loadable module into the running

kernel, execute the following kmadmin command:

/usr/sbin/kmadmin -L

module_name

When the loading completes, an identiﬁer (ID) number prints on the

standard output to identify the module that was loaded.

Changing the Conﬁgured Loading Phase of a Currently Registered

Module

Once a module has been registered with the currently running kernel,

the conﬁgured loading phase can be changed using the following

command syntax:

/usr/sbin/kmadmin -b

value module_name

For example, the following command schedules a registered module

named hello to be loaded at every system reboot, at the end of the boot

sequence (at init time);

/usr/sbin/kmadmim -b i hello

For more information, see “Preparing a Loadable Module for Dynamic

Loading Into the HP-UX Kernel” on page 511.

Unloading a Dynamically Conﬁgured Loadable Module

The unloading operation logically disconnects the module from the

running kernel and calls the module’s _unload() entry point to perform

any module-speciﬁc cleanup including:

1. Canceling all outstanding calls to timeout()

2. Disabling device interrupts

3. Freeing all active memory allocated by the speciﬁed loadable module

Use the -U or -u option of the kmadmin command to unload a DLKM

module conﬁgured as dynamically loadable. You have the choice of

unloading the module by its name or by its ID number.

Step 1. To unload a dynamically conﬁgured loadable module by name, execute

this kmadmin command:

/usr/sbin/kmadmin -U

module_name