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Date: Sun, 23 Aug 2020 23:31:32 +0200
From: Daniel Neri <>
Subject: Incompatible behaviour of res_query(3) w.r.t. NXDOMAIN


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:

On Debian Linux, OpenBSD and FreeBSD this program prints:

  error: Unknown host

but on Alpine Linux edge (musl v1.2.1):

  success (size 91)

Best regards,

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