MAKEDEV(3) | Library Functions Manual | MAKEDEV(3) |
makedev
, major
,
minor
—
#include <sys/types.h>
dev_t
makedev
(int
major, int
minor);
int
major
(dev_t
dev);
int
minor
(dev_t
dev);
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.
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.
April 1, 2011 | NetBSD 9.2 |