In message <20060105003422.22C5B3C01E3@berkshire.machshav.com>,
"Steven M. Bellovin" writes:

>In message <43BC5508.3040709@anastigmatix.net>, Chapman Flack writes:
>>matthew green wrote:
>>> EPERM?
>>
>>Not the way I read it ... EPERM is specifically about whether
>>the open would be allowed by the checks on your identity and
>>the mode bits on the node.  But you can have all the permissions
>>in the world and when you try to open /dev/cardpunch for reading,
>>something's still gotta give. It's an inherent device capability
>>issue, not a permission issue.
>>
>What do you get if you open a device on a read-only file system for 
>writing?   [...]

Err, EROFS, surely? Was this a trick question or a rhetorical question?