register_blkdev(9) [centos man page]

REGISTER_BLKDEV(9)						   Block Devices						REGISTER_BLKDEV(9)

NAME

       register_blkdev - register a new block device

SYNOPSIS

       int register_blkdev(unsigned int major, const char * name);

ARGUMENTS

       major
	   the requested major device number [1..255]. If major=0, try to allocate any unused major number.

       name
	   the name of the new block device as a zero terminated string

DESCRIPTION

       The name must be unique within the system.

       The return value depends on the major input parameter. - if a major device number was requested in range [1..255] then the function returns
       zero on success, or a negative error code - if any unused major number was requested with major=0 parameter then the return value is the
       allocated major number in range [1..255] or a negative error code otherwise

COPYRIGHT

Kernel Hackers Manual 3.10					     June 2014							REGISTER_BLKDEV(9)

lsdev(1M)																 lsdev(1M)

NAME

       lsdev - list device drivers in the system

SYNOPSIS

       driver | class] block_major] char_major] major] [major ...]

DESCRIPTION

       The  command lists, one pair per line, the major device numbers and driver names of device drivers configured into the system and available
       for invocation via special files.  A in either the block or character column means that a major number does not exist for that type.

       If no arguments are specified, lists all drivers configured into the system.

       If the option is specified, will not print a heading.  This option may be useful when the output of will be used by another program.

       The and options are used to select specific device drivers for output.  If more than one option is specified, all drivers  that	match  the
       criteria  specified  by	those options will be listed.  These search options are divided into two types: name search keys (the and options)
       and major number search keys (the and options).	If both types of options are present, only entries that match both types are printed.  The
       same  type of option may appear more than once on the command line with each occurrence providing an ORing effect of that search type.  The
       and options may not be specified at the same time.

       The ability to process major arguments is provided for compatibility and functions like the option.

   Options
	      List device drivers that match
				  class.

	      List device drivers with the name
				  driver.

	      List device drivers with a block major number of
				  block_major.

	      List device drivers with a character major number of
				  char_major.

	      List device drivers with either a character
				  major number or block major equal to major.

DIAGNOSTICS

       The    and options may not be specified at the same time.

       A major number is malformed or out of range.

EXAMPLES

       To output entries for all drivers in the class:

       To output entries that are in the class that have either a block or character major number of

       To get the character major number of into a shell environment variable:

WARNINGS

       Some device drivers available from the system may be intended for use by other drivers.	Attempting to use them	directly  from	a  special
       file may produce unexpected results.

       A  driver  may be listed even when the hardware requiring the driver is not present.  Attempts to access a driver without the corresponding
       hardware will fail.

       only lists drivers that are configured into the currently executing kernel.  For a complete list of  available  drivers,  please  run  (see
       sam(1M).

DEPENDENCIES

       Since relies on the device driver information provided in a routine, may not list drivers installed by other means.

AUTHOR

       was developed by HP.

SEE ALSO

       sam(1M).

       Section 7 entries related to specific device drivers.

																	 lsdev(1M)