Question

sample driver created and loaded successfully, in that a user defined function is written, it does some actions. i need to write a user program that calls the user defined function in the driver module.

need help in following cases.

1. How can i get access to the driver code from a user program ?.
2. How can i call a function that written in kernel module, from the user program ?.

thanks.

Answer 1

You can make your driver to react on writes (or if necessary, ioctl) to a /dev/xxx file or a /proc/xxx file. Also, you can create a new syscall, but that’s more of a toy as the module would only work on custom built kernels.

Edit: try http://www.faqs.org/docs/kernel/x571.html (on character device drivers.)