Driver
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The most simple drive code had to have the functions moduleinit and moduleexit to initialize and finalize the module. This are C macros that are defined in the linux/init.h header file.
Files are a fundamental concept in Linux and other operating systems. They are used to store data, programs, and other information on disk. In Linux, files are organized into a hierarchical directory structure, with directories containing files and other directories. This structure is similar to a tree, with the root directory at the top and subdirectories branching off from it.
System calls are the API interface between the user programs and the kernel. The kernel provides a set of system calls that user programs can use to request services from the kernel.