Sponsored Content
Full Discussion: Mknod
Operating Systems HP-UX Mknod Post 302199765 by Perderabo on Tuesday 27th of May 2008 09:54:09 PM
Old 05-27-2008
mknod is a utility to make filesystem objects. In the case of LVM you might do:
mknod /dev/vgxyz/group c 64 0x030000

You can call a volume group vgxyz if you want, but you must have a file called "group" in it. This form of mknod is making a character special file. 64 is the number of the LVM driver. (lsdev can list drivers.) 0x030000 is a unique number that you must pick to identify the volume group to the kernel. To you it's the vgxyz volume group, but to the kernel, it's the 03 volume group. The group file connects /dev/xyz to the number 03. Anytime you do a vgchange or whatever, the vgchange command needs to let the kernel know what's happening and it talks to the group file to do that.

Cameron, you should be using mkfifo to make your fifo's. And fifo's (aka named pipes) have nothing to do with this.
 

5 More Discussions You Might Find Interesting

1. UNIX for Dummies Questions & Answers

mknod

Can someone please tell me what the command mknod does and what it's syntax is? I can't find it in my "Unix for dummies" book or "Unix in s nutshell". I found it in an existing script that I want to copy, but I want to understand what I am doing. The script is going to do a full export of an... (3 Replies)
Discussion started by: bemeeks
3 Replies

2. Programming

mknod system call to clone /dev/null

I'm trying to use the "mknod" call in C to create a clone of /dev/null. I am stumped as to the final parameter I should provide to "mknod()". I am supposed to give it a type dev_t, which specifies a major & minor number. I want to specify major 3, minor 1, but how can I do this? dev_t seems to... (2 Replies)
Discussion started by: nathan
2 Replies

3. Solaris

Help:NFS mknod failed

this is existing issue for this nfs client, which mounts windows exported file system, and this is only one UNIX box has this problem, other boxes are fine. Here is from messages file. Jan 24 03:11:10 venus nfs: NFS mknod failed for server arc: error 2 (RPC: Can't decode result) Jan... (0 Replies)
Discussion started by: steeles
0 Replies

4. UNIX for Dummies Questions & Answers

Info regarding mknod -p

Hello All, Friends i know mknod with -p option is used to create FIFO special file.:p But i want to know some circumstance/scenario where these are used.:wall: Actually i want to know where i can use it in real time. Please advise.:) (3 Replies)
Discussion started by: Bibhudatta
3 Replies

5. AIX

What is mknod file present in /etc folder in AIX server used for ?

Hi Guys, On my AIX server , I have this file "mknod" present in the /etc/ directory. When i try opening it , I dont find any ascii characters. It shows some encryption/binary format which is not readable. Is it any executable ? what is the purpose of having this file in etc folder? what if... (2 Replies)
Discussion started by: DBTuner
2 Replies
mknod(8)						      System Manager's Manual							  mknod(8)

NAME
mknod - Creates a special file SYNOPSIS
/usr/sbin/mknod special_file [ b major_device# minor_device# | c major_device# minor_device#] /usr/sbin/mknod filename p DESCRIPTION
The mknod command makes a directory entry. The first argument is the name of the special device file. Select a name that is descriptive of the device. The mknod command has two forms. In the first form, the second argument is the b or c flag. The last two arguments are numbers specifying the major_device, which helps the operating system find the device driver code, and the minor_device, the unit drive, or line number, which may be either decimal or octal. The assignment of major device numbers is specific to each system. You can determine the device numbers by examining the conf.c system source file. If you change the contents of the conf.c file to add a device driver, you must rebuild the kernel. In the second form of mknod, you use the p flag to create named pipes (FIFOs). Only the superuser can create a character or device special file. FLAGS
Indicates that the special file corresponds to a block-oriented device (disk or tape) Indicates that the special file corresponds to a character-oriented device Creates named pipes (FIFOs) EXAMPLES
To create the special file for a new drive, /dev/disk/dsk20, with a major device number of 1 and a minor device number of 2, enter: mknod /dev/disk/dsk20 b 1 2 This command creates the special file, /dev/disk/dsk20, which is a block special file with major device number 1 and minor device number 2. To create a pipe named fifo, enter: mknod fifo p This command creates the pipe fifo, which is not necessarily in the current directory. FILES
Specifies the command path Specifies the system device numbers specification file delim off mknod(8)
All times are GMT -4. The time now is 11:25 AM.
Unix & Linux Forums Content Copyright 1993-2022. All Rights Reserved.
Privacy Policy