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cares: Support malloc(0) scenarios for AIX
Many places in cares library, when the stream data arrives from the network with respect to dns and reverse dns resolution, they are populated into data structures created dymaically based on the size of the data. Malloc is heavily used for such cases. Often, based on the data length, malloc(0) is invoked. Linux behavior on zero byte allocation is to return a valid pointer where in AIX, it always return NULL. This manifestst as test failure of test/internet/test-dns.js Solution is to build cares with Linux compatible malloc behavior PR-URL: #6305 Reviewed-By: James M Snell <firstname.lastname@example.org> Reviewed-By: Ben Noordhuis <email@example.com> Reviewed-by: Michael Dawson <firstname.lastname@example.org>
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