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MAKEDEV(3)		   Linux Programmer's Manual		    MAKEDEV(3)

NAME
       makedev,	major, minor - manage a	device number

SYNOPSIS
       #define _BSD_SOURCE	       /* See feature_test_macros(7) */
       #include	<sys/types.h>

       dev_t makedev(unsigned int maj, unsigned	int min);

       unsigned	int major(dev_t	dev);
       unsigned	int minor(dev_t	dev);

DESCRIPTION
       A device	ID consists of two parts: a major ID, identifying the class of
       the device, and a minor ID, identifying a specific instance of a	device
       in that class.  A device	ID is represented using	the type dev_t.

       Given major and minor device IDs, makedev() combines these to produce a
       device ID, returned as the function result.   This  device  ID  can  be
       given to	mknod(2), for example.

       The  major()  and  minor() functions perform the	converse task: given a
       device ID, they return, respectively, the major and  minor  components.
       These macros can	be useful to, for example, decompose the device	IDs in
       the structure returned by stat(2).

CONFORMING TO
       The makedev(), major(), and minor()  functions  are  not	 specified  in
       POSIX.1,	but are	present	on many	other systems.

NOTES
       These  interfaces  are defined as macros.  Since	glibc 2.3.3, they have
       been  aliases  for  three  GNU-specific	functions:  gnu_dev_makedev(),
       gnu_dev_major(),	 and  gnu_dev_minor().	The latter names are exported,
       but the traditional names are more portable.

SEE ALSO
       mknod(2), stat(2)

COLOPHON
       This page is part of release 3.74 of the	Linux  man-pages  project.   A
       description  of	the project, information about reporting bugs, and the
       latest	 version    of	  this	  page,	   can	   be	  found	    at
       http://www.kernel.org/doc/man-pages/.

Linux				  2014-05-28			    MAKEDEV(3)

NAME | SYNOPSIS | DESCRIPTION | CONFORMING TO | NOTES | SEE ALSO | COLOPHON

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