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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In a recursive solution to a problem, we solve a problem P(n) by solving another problem P(k) where
a. P(k) is the hardest part of P(n) b. P(k) is a larger problem than P(n) c. P(k) is smaller than P(n) d. P(k) is the same problem as P(n) apart from size.