On Tue, Sep 23, 2008 at 10:34:30PM -0600, Matthew Wilcox wrote:
> > > > + return -ENOTSUPP;
> > >
> > > return -ENOTTY;
> >
> > I will modify this. But I still don't understand why -ENOTTY... I think there
> > are some history about it?
>
> Yes. ENOTTY means "This operation cannot be performed on this device".
"man errno" says:
ENOTTY Inappropriate I/O control operation (POSIX.1)
> EOPNOTSUPP is some networking error, I forget the details now.
EOPNOTSUPP Operation not supported on socket (POSIX.1)
(ENOTSUP and EOPNOTSUPP have the same value on Linux,
but according to POSIX.1 these error values should be
distinct.)
man page doesn't mention ENOTSUPP. And that might be sufficient
reason to not use it.
Folks have replaced ENOTSUPP for that reason in the past:
http://www.uwsg.iu.edu/hypermail/linux/kernel/0402.3/0180.html
http://linux.derkeiler.com/Mailing-Lists/Kernel/2006-04/msg06283.html
hth,
grant
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