MAKEDEV(3C) Standard C Library Functions MAKEDEV(3C)

NAME

makedev, major, minor - manage a device number

SYNOPSIS

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

dev_t makedev(major_t maj, minor_t min);


major_t major(dev_t device);


minor_t minor(dev_t device);

DESCRIPTION

The makedev() function returns a formatted device number on success
and NODEV on failure. The maj argument is the major number. The min
argument is the minor number. The makedev() function can be used to
create a device number for input to mknod(2).


The major() function returns the major number component from device.


The minor() function returns the minor number component from device.

RETURN VALUES

Upon successful completion, makedev() returns a formatted device
number. Otherwise, NODEV is returned and errno is set to indicate
the error.

ERRORS

The makedev() function will fail if:

EINVAL
One or both of the arguments maj and min is too large, or
the device number created from maj and min is NODEV.


The major() function will fail if:

EINVAL
The device argument is NODEV, or the major number component
of device is too large.


The minor() function will fail if:

EINVAL
The device argument is NODEV.

ATTRIBUTES

See attributes(7) for descriptions of the following attributes:


+---------------+-----------------+
|ATTRIBUTE TYPE | ATTRIBUTE VALUE |
+---------------+-----------------+
|MT-Level | MT-Safe |
+---------------+-----------------+

SEE ALSO

mknod(2), stat(2), attributes(7)

December 29, 1996 MAKEDEV(3C)