REGISTER_BLKDEV(9) Block Devices REGISTER_BLKDEV(9)NAME
register_blkdev - register a new block device
int register_blkdev(unsigned int major, const char * name);
the requested major device number [1..255]. If major=0, try to allocate any unused major number.
the name of the new block device as a zero terminated string
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)
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lsdev - list device drivers in the system
driver | class] block_major] char_major] major] [major ...]
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.
List device drivers that match
List device drivers with the name
List device drivers with a block major number of
List device drivers with a character major number of
List device drivers with either a character
major number or block major equal to major.
The and options may not be specified at the same time.
A major number is malformed or out of range.
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:
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
Since relies on the device driver information provided in a routine, may not list drivers installed by other means.
was developed by HP.
SEE ALSO sam(1M).
Section 7 entries related to specific device drivers.
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