In Linux and other unixes every device has a number. This can be split out into major and minor numbers which is generally how humans see them.

There are three different sizes: 16 32 and 64 bits and the major and minor numbers are jumbled across them.

For some unknown reason lost to time, used its own definition but now it uses the glibc macro. For Linux systems this is no change but it helps with others such as cygwin

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