'fd' entry in devfs.rules

[usakhncit]

Hi
What does 'fd' in the following entry of (/etc/devfs.rules) mean, a "floppy disk", a "file descriptor" or something else?

add path 'fd[0-9]\*' mode 666

Thanks

 

[SirDice]

Why don't you read fd(4) and find out what it is?

 

[usakhncit]

Why don't you read fd(4) and find out what it is?

Now, you are being harsh here, without knowing the background
I did check it. 'fd' manpage shows that it is file descriptor. However, 'fdc' manpage shows that it is floppy controller with following description:

By default, this driver creates a single device node /dev/fdN for each attached drive with number N.

Moreover, ls /dev/fd*, shows: 0 1 2 3 4 (nodes)
As, the syntax of the file /etc/devfs.rules shows similar pattern i.e. "fd[0-9]", therefore, it creates a confusion that whether it is a File Descriptor or a Floppy Disk.

 

[SirDice]

From fd(4):

DESCRIPTION
     The files /dev/fd/0 through /dev/fd/# refer to file descriptors which can
     be accessed through the file system.

From fdc(4)

FILES
     /dev/fd*      floppy disk device nodes

So, which one do you think applies to /dev/fd[0-9]* then?

Now, you are being harsh here, without knowing the background

You didn't mention the background, so how can I know? And I'm trying to teach you how to lookup the information because the answer is already right in front of you.

As, the syntax of the file /etc/devfs.rules shows similar pattern i.e. "fd[0-9]",

Similar, yes. But not the same. One is /dev/fd/[0-9], the other is /dev/fd[0-9].