Strange behaviour from mkdir()?

[Pieter de Goeje]

Hi MC,

On Sunday 04 June 2006 20:48, mal content wrote:
> Is this expected behaviour (I'm using the mkdir utility
> for the example, but the problem occurs using the system
> call directly):
>
> # mkdir .
> mkdir: .: File exists
> # mkdir ..
> mkdir: ..: File exists
>
> Now, the unusual one:
>
> # mkdir /
> mkdir: /: Is a directory
>
> Shouldn't it say 'file exists'?
In fact, the _only_ directory that I could find that shows this behaviour 
is /. (I am using 6-stable)

>
> The mkdir() man page doesn't say that the function can set
> errno to EISDIR and yet that's what's happening here.
>

I did some research on it, and it seems the mkdir utility is aware of the 
EISDIR error. Kinda weird if you ask me, since it isn't documented.

Pieter de Goeje