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        <version>9.7.1</version>
        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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            <title>[SERVER-78520] Make mongo servers use a file handle to accept new connections</title>
                <link>https://jira.mongodb.org/browse/SERVER-78520</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;For testing purposes it&apos;s useful to start mongod with `--port=0` to have the server choose an arbitrary free port. This approach is still messy, though, because the way to recover that port (in a cross-platform way) is to parse it out of the log.&lt;/p&gt;

&lt;p&gt;It also, as of this writing, doesn&apos;t work with mongos. (cf. &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-78384&quot; title=&quot;mongos should allow --port 0&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-78384&quot;&gt;&lt;del&gt;SERVER-78384&lt;/del&gt;&lt;/a&gt;)&lt;/p&gt;

&lt;p&gt;One alternative is, in the calling process, to &lt;tt&gt;bind()&lt;/tt&gt; a new socket to port 0, not its port, then close the socket and assign that port to mongod. This, though, isn&apos;t race-safe.&lt;/p&gt;

&lt;p&gt;A more ideal solution would be to allow mongod/mongos to accept a raw file descriptor in lieu of a port. That file descriptor would need to be of the appropriate type and be pre-bind()ed, and the calling process would need to a) disable the socket&apos;s cloexec flag, and b) close the socket after the fork. That way, the calling process can know in advance which freely-chosen port number mongod will use.&lt;/p&gt;

&lt;p&gt;This could also be useful with, e.g., systemd or xinetd, which I believe use this functionality to allow daemons to go &quot;dormant&quot;.&lt;/p&gt;

&lt;p&gt;Caveat: I don&apos;t know how applicable this pattern would be outside POSIX OSes.&lt;/p&gt;

&lt;p&gt;Note: filing this on behalf of &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=felipe.gasper%40mongodb.com&quot; class=&quot;user-hover&quot; rel=&quot;felipe.gasper@mongodb.com&quot;&gt;felipe.gasper@mongodb.com&lt;/a&gt;.&lt;/p&gt;</description>
                <environment></environment>
        <key id="2379633">SERVER-78520</key>
            <summary>Make mongo servers use a file handle to accept new connections</summary>
                <type id="2" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14711&amp;avatarType=issuetype">New Feature</type>
                                            <priority id="3" iconUrl="https://jira.mongodb.org/images/icons/priorities/major.svg">Major - P3</priority>
                        <status id="10038" iconUrl="https://jira.mongodb.org/images/icons/subtask.gif" description="">Backlog</status>
                    <statusCategory id="2" key="new" colorName="default"/>
                                    <resolution id="-1">Unresolved</resolution>
                                        <assignee username="backlog-server-servicearch">Backlog - Service Architecture</assignee>
                                    <reporter username="amirsaman.memaripour@mongodb.com">Amirsaman Memaripour</reporter>
                        <labels>
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                <created>Wed, 28 Jun 2023 18:38:50 +0000</created>
                <updated>Mon, 3 Jul 2023 19:17:48 +0000</updated>
                                                                            <component>Internal Code</component>
                                        <votes>0</votes>
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