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SubjectRe: access() says EROFS even for device files if /dev is mounted RO
On Tue, Nov 28, 2000 at 03:04:31PM +0100, Rogier Wolff wrote:

> Ok, so if you read the standard carefully you get a bogus result.

Why bogus? Things could have been otherwise, but the important
part is that all Unices do things the same way.

> Question: Was it meant this way, or did someone just make a mistake
> (which happened to slip through and get approved into the standard)?
>
> I happen to think the second.
>
> - Is it desirable to have a write-open of a device on a read-only
> fail? I don't think so. You can't open the initial console etc etc.

Nevertheless the standard requires this.

> - Is it desirable to have access (W_OK) and "open-for-write" return
> different results? I don't think so.

Nevertheless there have never been systems where access and open
behaved identically. An easy example is given by directories
that have write access when a w bit is set, but return EISDIR
upon open-for-write.

Andries
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