From: Daniel Berger <djberg96@...>
Date: 2009-01-28T14:18:04+09:00
Subject: Re: Super User Can't Change UID?

James Gray wrote:
> Why would the super user not be able to switch UID's?
> 
>   $ sudo ruby -r etc -e 'Process.uid = Etc.getpwnam("james").uid'
>   Password:
>   -e:1:in `uid=': Operation not permitted (Errno::EPERM)
>       from -e:1
> 
> Tips of TFM I should go R are welcome.  :)

I seem to recall that setreuid() is busted on OS X, 10.4.x anyway. I 
think it's fixed in 10.5, but I can't confirm.

I know this has come up before. Check the the ruby-core archives.

Regards,

Dan