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From: Mel Flynn <mel.flynn+fbsd.questions@mailing.thruhere.net>
To: freebsd-questions@freebsd.org
Date: Fri, 27 Mar 2009 11:32:58 +0100
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Cc: Tobias Rehbein <tobias.rehbein@web.de>
Subject: Re: [perl] sysopen(CD, "/dev/cd0", O_RDONLY | O_NONBLOCK) fails
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On Thursday 26 March 2009 22:20:45 Tobias Rehbein wrote:
> Hi all.
>
> I have a perl script which seems to work fine under Linux but fails on
> FreeBSD. The Problem is the line:
>
>         sysopen(CD, "/dev/cd0", O_RDONLY | O_NONBLOCK)
>
> After this line the following evaluates to true:
>
>         $! eq "No such file or directory."

If you're running this in a jail, then cd0 is hidden by devfs, hence the 
ENOENT. You will need to provide a jail specific ruleset, or override 
devfsrules_jail from /etc/defaults/devfs.rules in /etc/devfs.rules so it 
applies to all jails without modification to /etc/rc.conf.
-- 
Mel