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How to convert Linux Kernel built-in module into a loadable module


 
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Operating Systems Linux How to convert Linux Kernel built-in module into a loadable module
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Old 10-10-2008
How to convert Linux Kernel built-in module into a loadable module

Hi all,

I am working on USB data monitoring on Fedora Core 9. Kernel 2.6.25 has a built-in module (the one that isn't loadable, but compiles and links statically with the kernel during compilation) to snoop USB data. It is in <kernel_source_code>/drivers/usb/mon/.

I need to know if I can somehow convert 'usb_mon' into a loadable module since I am making changes in this code I need to recompile the kernel and boot my linux after every change. I'm familiar device driver programming on kernel 2.4 but I am not sure about kernel 2.6 (though the things look similar here).

Thanks for looking into my post.
(Also please re-direct me to any other similar post if available)

-anitemp!

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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)

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