>But It seems we still cannot just use the IRS library, because it
>lacks some features that nsswitch (we, SVR4, Solaris and Linux) have.
>For example, nsswitch can be configured as either CONTINUE or RETURN
>for TRY_AGAIN and UNAVAIL cases. But IRS can only act as CONTINUE
>for those cases. Right?

>IRS has some features that nsswitch doesn't have, though.
>e.g. "merge" feature for group database.

	now you are talking about nsswitch.conf and irs.conf, not thread-
	safeness of nsswitch() and irs-related functions.  don't mix the topic
	up.

	if we really need to provide backward compatibility to nsswitch.conf,
	yes, we have to modify irs library to take care of syntax like
	[notfound=return].  however, i'm not really convinced that it is good
	to provide that level of flexibility to users.  in what kind of cases
	this is useful?  could you provide any usage cases?

itojun