Date: Mon, 24 Aug 2020 12:16:47 -0400 From: Rich Felker <dalias@...c.org> To: musl@...ts.openwall.com Subject: Re: Incompatible behaviour of res_query(3) w.r.t. NXDOMAIN On Sun, Aug 23, 2020 at 11:31:32PM +0200, Daniel Neri wrote: > Hello, > > > Musl’s res_query(3) returns success for a query that results in an > NXDOMAIN response, which disagrees with other common > implementations. > > Simple test case: https://t.rb67.eu/res_query.c > > On Debian Linux, OpenBSD and FreeBSD this program prints: > > error: Unknown host > > but on Alpine Linux edge (musl v1.2.1): > > success (size 91) I think there's a good argument that this should be changed, but that would require making res_* set h_errno, which would require making h_errno thread-local -- which it probably should have been all along, but the standard interfaces that used it, gethostby* etc., were non-thread-safe anyway and thus it seemed unnecessary. FWIW I think the musl behavior is *better* here (more informative to the application), but usually it's preferable not to break the existing (even if informal) contracts of the interfaces being implemented than to be "better". Rich
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