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<th>Priority</th>
<td>medium
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - Synchronous name service queries are done from the main thread -> potential long delays"
href="https://bugs.freedesktop.org/show_bug.cgi?id=81802">81802</a>
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<th>CC</th>
<td>lennart@poettering.net
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<th>Assignee</th>
<td>pulseaudio-bugs@lists.freedesktop.org
</td>
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<th>Summary</th>
<td>Synchronous name service queries are done from the main thread -> potential long delays
</td>
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<th>QA Contact</th>
<td>pulseaudio-bugs@lists.freedesktop.org
</td>
</tr>
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<th>Severity</th>
<td>normal
</td>
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<th>Classification</th>
<td>Unclassified
</td>
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<th>OS</th>
<td>All
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<th>Reporter</th>
<td>tanuk@iki.fi
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<th>Hardware</th>
<td>Other
</td>
</tr>
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<th>Status</th>
<td>NEW
</td>
</tr>
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<th>Version</th>
<td>unspecified
</td>
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<th>Component</th>
<td>core
</td>
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<th>Product</th>
<td>PulseAudio
</td>
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<p>
<div>
<pre>pa_get_fqdn() does a name service query with getaddrinfo(). The query is
synchronous, and can take a long time, and since pa_get_fqdn() is called from
the server's main thread (e.g. module-native-protocol-tcp via
pa_socket_server_get_address()), the server will get stalled for the duration
of the query. This was originally reported in Tizen's bug tracker:
<a href="https://bugs.tizen.org/jira/browse/TC-1130">https://bugs.tizen.org/jira/browse/TC-1130</a>
If the query to get the FQDN takes a long time, the network configuration can
perhaps be considered broken, but nevertheless, I think we should be resistant
to misconfigured networks. pa_get_fqdn() can't be changed to an asynchronous
version, because it's part of the stable API, but we can add a new function
pa_get_fqdn_async() that uses libasyncns. Then all code that currently uses
pa_get_fqdn() should be reviewed and changed to use pa_get_fqdn_async() if
necessary.</pre>
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</p>
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