|
Message-ID: <20200824161646.GH3265@brightrain.aerifal.cx> 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
Powered by blists - more mailing lists
Confused about mailing lists and their use? Read about mailing lists on Wikipedia and check out these guidelines on proper formatting of your messages.