As one of the things I am doing in my ever-expanding-in-scope
CD include patch (see http://www.inconnect.com/~andersen/files)
is to return ENOSYS for non-implemented functions instead of
EINVAL. Grep /usr/include/asm/errno.h some time and you will
have your eyes opened to all the official things that can go wrong.
-Erik
p.s. My current patch only partly works, but at least it only partly works
with 4 drivers ported to the uniform cdrom driver... [GRIN]
Brave people only at this point.
--
Erik B. Andersen Web: http://www.inconnect.com/~andersen/
email: andersee@debian.org
--This message was written using 73% post-consumer electrons--
On Tue, 23 Sep 1997, Gerd Knorr wrote:
>
> Hi !
>
> While hacking the scsi cdrom driver and teaching him to return useful
> errno codes on failed ioctls I came across the following problem:
>
> I hav'nt found a error code to tell a program that the drive does not
> support some action. Well, there is that generic EINVAL, but I'd like to
> be a bit more specific. A audio ioctl for example might fail for two
> reasons:
>
> a) there are invalid parameters (one tried to start audio playback
> behind the last track or something). EINVAL is ok for this one
> I think.
> b) The drives does'nt support the scsi-2 audio commands at all (some
> old nec drives). For this one I'd like to return something else than
> just EINVAL. Is there some error code for this kid of errors?
>
> Gerd
>
>