[Bug 212167] listen() system call succeeds for a locally bound UNIX-domain datagram-oriented socket

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=212167

            Bug ID: 212167
           Summary: listen() system call succeeds for a locally bound
                    UNIX-domain datagram-oriented socket
           Product: Base System
           Version: 10.3-STABLE
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: arseny.vakhrushev at gmail.com

Created attachment 174083
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=174083&action=edit
Simple program that illustrates the bug

FreeBSD 10.3-RELEASE-p4:

While messing with UNIX-domain sockets (AF_LOCAL), I've noticed that the
listen() system call succeeds for a locally bound datagram-oriented
(SOCK_DGRAM) socket on FreeBSD while legitimately failing on other systems
since datagram sockets can't be in a listening state. Seemed like not a big
deal first but eventually led to some undefined behaviour (which I wasn't able
to reproduce as a separate test-case unfortunately).

Nevertheless, expected behaviour would be to fail with EOPNOTSUPP or a similar
error code.

Also, please note that no such unexpected behaviour is observed for UDP sockets
(AF_INET and AF_INET6). The bug seems to affect only UNIX sockets (AF_LOCAL).
See attached a simple program that illustrates the bug.

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