Linux should define ENOTSUP

[Samuel Thibault <samuel.thibault@ens-lyon.org>]

Hi,

ENOTSUP is not used at all by linux (though it is defined for parisc),
while as susv3 specifies, ENOTSUP shall be different than EOPNOTSUPP.
Is there a reason for doing so? (except history)

Currently, code like

switch(errno) {
	ENOTSUP:
		foo();
		break;
	EOPNOTSUP:
		bar();
		break;
}
just can't compile...

Is there any way to fix this?  Glibc people don't seem to want to fix it
on their part, see
http://sources.redhat.com/bugzilla/show_bug.cgi?id=2363

Samuel
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