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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 LINUX

create_module

CREATE_MODULE(2)					     Linux Programmer's Manual						  CREATE_MODULE(2)

NAME

       create_module - create a loadable module entry

SYNOPSIS

       #include <linux/module.h>

       caddr_t create_module(const char *name, size_t size);

       Note: No declaration of this function is provided in glibc headers; see NOTES.

DESCRIPTION

       Note: This system call is present only in kernels before Linux 2.6.

       create_module() attempts to create a loadable module entry and reserve the kernel memory that will be needed to hold the module.  This sys-
       tem call requires privilege.

RETURN VALUE

       On success, returns the kernel address at which the module will reside.	On error, -1 is returned and errno is set appropriately.

ERRORS

       EEXIST A module by that name already exists.

       EFAULT name is outside the program's accessible address space.

       EINVAL The requested size is too small even for the module header information.

       ENOMEM The kernel could not allocate a contiguous block of memory large enough for the module.

       ENOSYS create_module() is not supported in this version of the kernel (e.g., the kernel is version 2.6 or later).

       EPERM  The caller was not privileged (did not have the CAP_SYS_MODULE capability).

VERSIONS

       This system call is present on Linux only up until kernel 2.4; it was removed in Linux 2.6.

CONFORMING TO

       create_module() is Linux-specific.

NOTES

       The create_module() system call is not supported by glibc.  No declaration is provided in glibc headers, but, through a quirk  of  history,
       glibc  does  export  an ABI for this system call.  Therefore, in order to employ this system call, it is sufficient to manually declare the
       interface in your code; alternatively, you can invoke the system call using syscall(2).

SEE ALSO

       delete_module(2), init_module(2), query_module(2)

Linux								    2014-05-10							  CREATE_MODULE(2)