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test: allow for different nsswitch.conf settings
The motivation for this commit is that these two test fail on systems that have different Name Service Switch configuration settings. A concrete example of this is when using Red Hat Enterprise Linux (RHEL) 7. If Name Service Switch is available on the operating system then it might be configured differently (/etc/nsswitch.conf). If the system is configured with no dns the error code will be AI_AGAIN, but if there are more services after the dns entry, for example some linux distributions skip a myhostname service by default which would still produce the ENOTFOUND error. This commit suggests checking for either ENOTFOUND or EAI_AGAIN to accommodate systems like the ones described above. The references below indicate that others have run, or are running, into this aswell. Refs: #12075 Refs: nodejs/help#687 Refs: #15825 PR-URL: #16378 Reviewed-By: Anna Henningsen <anna@addaleax.net> Reviewed-By: James M Snell <jasnell@gmail.com> Reviewed-By: Luigi Pinca <luigipinca@gmail.com> Reviewed-By: Colin Ihrig <cjihrig@gmail.com> Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>
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