I was recently trying a few Loadable Kernel Modules with Linux, and the traditional "Hello World!" module worked fine, except that I couldnt find which header file contains the prototype of printk() (gcc with -Wall gave a warning). Does any one know where is this function prototyped?
Now for the bigger problem: When I opened /usr/include/linux/fs.h, I didn't find the definition of the "struct file{}", which I needed for a module, though it was there in /usr/src/linux-2.4/include/linux/fs.h. The /usr/include header contained only a portion of the kernel header.
So my question is this: How do I get the definition if "file struct". Which are the correct headers to be used in the modules: the kernel headers from the src/ directory, or from the /usr/include directory?
I haven't found this problem documented somewhere, so it may be that I am missing something simple here.
I am using a stock RH 8.0 Installation
Regards & thanks in advance, Ashutosh
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