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MAKEDEV(3) BSD Library Functions Manual MAKEDEV(3)
makedev, major, minor -- device number conversion
makedev(int major, int minor);
The makedev() macro allows a unique device number to be generated based on its major and
minor number. The major() and minor() macros can be used to obtain the original numbers
from the device number dev.
All block and character devices are uniquely identified by a pair of major and minor num-
bers. The major number refers to a certain device class (e.g. disks, TTYs) while the minor
number identifies an instance within the device class.
The major() macro returns a device major number that has a value between 0 and 255. The
minor() macro returns a device minor number whose value can span the complete range of an
mknod(2), devname(3), MAKEDEV(8)
BSD April 1, 2011 BSD
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