man/man3c/makedev.3c

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 Copyright 1989 AT&T
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 MAKEDEV 3C "Dec 29, 1996"
 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(5) for descriptions of the following attributes:


ATTRIBUTE TYPE ATTRIBUTE VALUE
MT-Level MT-Safe


 SEE ALSO

mknod(2), stat(2), attributes(5)