major(3) - NetBSD Manual Pages

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MAKEDEV(3)              NetBSD Library Functions Manual             MAKEDEV(3)

makedev, major, minor -- device number conversion
#include <sys/types.h> dev_t makedev(int major, int minor); int major(dev_t dev); int minor(dev_t dev);
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 numbers. 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 int.
mknod(2), devname(3), MAKEDEV(8) NetBSD 9.0 April 1, 2011 NetBSD 9.0
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