Linux and UNIX Man Pages

Linux & Unix Commands - Search Man Pages

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)

Check Out this Related Man Page

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)
Man Page

15 More Discussions You Might Find Interesting

1. Fedora

Is UNIX an open source OS ?

Hi everyone, I know the following questions are noobish questions but I am asking them because I am confused about the basics of history behind UNIX and LINUX. Ok onto business, my questions are-: Was/Is UNIX ever an open source operating system ? If UNIX was... (21 Replies)
Discussion started by: sreyan32
21 Replies

2. UNIX for Beginners Questions & Answers

Weird 'find' results

Hello and thanks in advance for any help anyone can offer me I'm trying to learn the find command and thought I was understanding it... Apparently I was wrong. I was doing compound searches and I started getting weird results with the -size test. I was trying to do a search on a 1G file owned by... (14 Replies)
Discussion started by: bodisha
14 Replies

3. UNIX for Beginners Questions & Answers

Set hard block limit for user using quota

hi all, i have installed quota on my centos 7 machine and its what im after (setting size limit on users, so they cant fill the hard drive) i want to now make this part of my create user script for my sftp server so i want to do a echo and a read command so i capture the limit they enter... (0 Replies)
Discussion started by: robertkwild
0 Replies

4. UNIX for Beginners Questions & Answers

Best performance UNIX just for HOST Virtualization?

Hi everybody, Which Unix base OS have best performance for HOST virtualization? I tested SmartOS but it needs another OS to connect remotely! Thanks in advance. (11 Replies)
Discussion started by: mbzadegan
11 Replies

5. UNIX for Beginners Questions & Answers

How to increment version inside a file?

Hi All, I need to write a shell script which opens a file and increments the version(text) within the file every time the script runs. For example: $ cat docker_file.yml version: '3.1' services: ui: image: repo-srv.dev.io:5000/facebook/ui:0.0.2-QA1 $ So, I would like... (6 Replies)
Discussion started by: akshayupadhayay
6 Replies

6. Programming

DB2 convert digits to binary format

Dear Team We use DB2 v10.5 and using DBArtisan tool Can someone please guide how to convert digits to binary numbers using db2 feature. Ex> for number 9 , binary should be 1001 ( 8+1) Any help appreciated. Thanks (2 Replies)
Discussion started by: Perlbaby
2 Replies

7. UNIX for Advanced & Expert Users

Tar Command

hi folks, how to using tar with exclude directory and compress it using tar.Z i only know how to exclude dir only with this command below: tar -cvf /varios/restore/test.tar -X excludefile.txt /jfma/test1/ how to compress it using 1 command? Thanx Please use CODE tags as... (6 Replies)
Discussion started by: only
6 Replies

8. UNIX for Advanced & Expert Users

CentOS7 restoring file capabilities

Quite an obscure question I think. We have a rebuild process for remote sites that allows us to PXE rebuild a till (actually a PC with a touch screen and various fancy bits) running CentOS. The current CentOS5 tills work just fine with a tar image restore and some personalisation. Sadly,... (4 Replies)
Discussion started by: rbatte1
4 Replies

9. Docker

Docker learning Phase-I

Hello All, I had recently learnt a bit of Docker(which provides containerization process). Here are some of my learning points from it. Let us start first with very basic question: What is Docker: Docker is a platform for sysadmins and developers to DEPLOY, DEVELOP and RUN applications ... (7 Replies)
Discussion started by: RavinderSingh13
7 Replies

10. UNIX for Advanced & Expert Users

Shopt -s histappend

What is the point of this? Whenever I close my shell it appends to the history file without adding this. I have never seen it overwrite my history file. # When the shell exits, append to the history file instead of overwriting it shopt -s histappend (3 Replies)
Discussion started by: cokedude
3 Replies

11. UNIX for Beginners Questions & Answers

Unsure why access time on a directory change isn't changing

Hello... And thanks in advance for any help anyone can offer me I was trying to work out the differences between displaying modify, access, and change times with the 'ls' command. Everything seems in order when I look at files, but the access time on a directory doesn't seem to change when I... (4 Replies)
Discussion started by: bodisha
4 Replies

12. UNIX for Beginners Questions & Answers

CentOS 6 ran out of space, need to reclaim it

Hello everyone, I am having an issue here with CentOS release 6.6 (Final) that shows all of the space used up, but I can't tell where the space went. Seemingly I am using up 100%, according to df -h Filesystem Size Used Avail Use% Mounted on... (27 Replies)
Discussion started by: DannyBoyCentOS
27 Replies

13. Shell Programming and Scripting

Controlling user input

I'm trying to use a bash script for a psych experiment that involves listening to sound files and responding. If I have something like the code below, how can I make sure that a key press is assigned to RESPONSE only after the second echo statement? for i in 1 2 3; do echo "Ready?" sleep 2 ... (10 Replies)
Discussion started by: darwin_886
10 Replies

14. Shell Programming and Scripting

[TIP] Processing YAML files with yq

After the success of the jq - tool for parsing and manipulating JSON-Data someone wrote a tool called yq, which aims to be the same for YAML, what jq is for JSON. Seems to work fine. I'll definitely give it a chance in future. Example YAML-File: --- !ruby/object:Puppet::Node::Facts ... (1 Reply)
Discussion started by: stomp
1 Replies

15. What is on Your Mind?

Please Welcome Dave Munro to the Moderator Team!

Dear All, I am very pleased to announce that Dave Munro (gull04) is joining the Moderation Team, after being a very valuable member of UNIX.com for 15+ years. Dave is an IT Consultant with 30 years of experience this year, has worked in many of the industry vertical market segments and has... (6 Replies)
Discussion started by: Neo
6 Replies

Featured Tech Videos