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 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.
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)