NAME    [Toc]    [Back]

     device_ids, major, minor, umajor, uminor -- calculate device ids

SYNOPSIS    [Toc]    [Back]

     #include <sys/types.h>
     #include <sys/systm.h>

     int
     major(dev_t dev);

     int
     minor(dev_t dev);

     int
     umajor(udev_t id);

     int
     uminor(udev_t id);

DESCRIPTION    [Toc]    [Back]

     The device_ids family of functions take either the raw device ID, id, or
     a pointer to the device structure, dev, and return the integer value that
     is the major or minor device ID as requested.

     The actual major and minor device IDs are values masked from of the raw
     device ID.  For details on the actual calculations used to determine the
     major or minor IDs see the actual source in kern_conf.c.

RETURN VALUES    [Toc]    [Back]

     An integer greater than zero and less than NUMCDEVSW.  major() and
     minor() will return NOUDEV if the device is invalid.

AUTHORS    [Toc]    [Back]

     This manual page was written by Chad David <davidc@acns.ab.ca>.


FreeBSD 5.2.1			 July 9, 2001			 FreeBSD 5.2.1