makedev man page on FreeBSD

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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.

     In previous implementations of FreeBSD all block and character devices
     were uniquely identified by a pair of major and minor numbers.  The major
     number referred to a certain device class (e.g. disks, TTYs) while the
     minor number identified an instance within the device class.  Later ver‐
     sions of FreeBSD automatically generate a unique device number for each
     character device visible in /dev/.	 These numbers are not divided in
     device classes.

     On FreeBSD these macros are only used by utilities that need to exchange
     numbers with other operating systems that may use different encodings for
     dev_t, but also applications that present these numbers to the user in a
     more conventional way.

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
     devfs(5), devname(3), mknod(2)

BSD			      September 28, 2008			   BSD
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