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NetBSD 6.1.5 - man page for major (netbsd section 3)

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MAKEDEV(3)			   BSD Library Functions Manual 		       MAKEDEV(3)

NAME
     makedev, major, minor -- device number conversion

SYNOPSIS
     #include <sys/types.h>

     dev_t
     makedev(int major, int minor);

     int
     major(dev_t dev);

     int
     minor(dev_t dev);

DESCRIPTION
     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.

RETURN VALUES
     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.

SEE ALSO
     mknod(2), devname(3), MAKEDEV(8)

BSD					  April 1, 2011 				      BSD
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