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Export functions in kernel module to user Programs

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Operating Systems Linux Red Hat Export functions in kernel module to user Programs
# 1  
Old 10-28-2009
Export functions in kernel module to user Programs
Hi all,

I just started working on kernel modules. One query i'm not able to resolve how i can use call any of my function(take example testfunc() ) defined in my loadable kernel module (take example : test.ko)
I want to export kernel module functions to user programs.

Consider i have insmoded test.ko, now i'm writing any program on my linux machine and i want to use or call testfunc() in my program in userspace, and i don't want to call testfunc() at loading of test.ko (because there is way of calling it from init_module()), i want to call it from my program afterwards then how i should do this or is it possible or not?

Please guide. Waiting for response.

Thanks and Regards,
Tarun
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LEARN ABOUT HPUX

moduload

moduload(2)							System Calls Manual						       moduload(2)

NAME

       moduload - unload a kernel module on demand

SYNOPSIS

DESCRIPTION

       allows processes with appropriate privilege to demand unload one or all unloadable modules from the running kernel.  A module is considered
       unloadable if it is not currently in use, if no module depending on it is currently loaded, and if  the	module	is  not  being	loaded	or
       unloaded  from  the  kernel.   If module_id is set to 0 (zero), attempts to unload all unloadable modules, otherwise attempts to unload the
       module specified by module_id.

   Notes
       is currently implemented as a macro.

   Security Restrictions
       is restricted to superuser processes or privileged processes.  A privileged process requires the privilege to execute the system call.

       See privileges(5), for more information about the privilege.

RETURN VALUE

       On success, returns 0, otherwise it returns -1 and sets to indicate the error.

ERRORS

       fails if one or more of the following are true:

	      module_id     does not correspond to any valid currently loaded kernel module.

	      The caller is not a superuser process or a privileged process.

	      There are outstanding references to the module, or modules that depend
			    on this module are currently loaded, or profiling is enabled, or the module is in  the  process  of  being	loaded	or
			    unloaded from the kernel.

	      The Dynamically Loadable Kernel Module feature is not initialized.

SEE ALSO

       kcmodule(1M), modload(2), privileges(5).

																       moduload(2)