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  mak-
     edev()  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 com-
           ponent 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  attri-
     butes:

     ____________________________________________________________
    |       ATTRIBUTE TYPE        |       ATTRIBUTE VALUE       |
    |_____________________________|_____________________________|
    | MT-Level                    | MT-Safe                     |
    |_____________________________|_____________________________|

SEE ALSO

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