Explain the concept and usage of device special files.
What will be an ideal response?
Device special files are entries in the /dev directory that allow the kernel to access a
device. They are accessed via the VFS using low-level read() and write() calls for basic
functions and can use the ioctl system call for functions that fall outside the realm of reading
and writing (such as ejecting a disk). The implementation of device special files typically
falls in the category of a character or block device.
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