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        'cargo' => {
          'type' => 'leaf',
          'value_type' => 'uniline'
        },
        'description' => 'Specifies a file system FIFO (see L<fifo(7)> for
details) to listen on.	This expects an absolute file system path as argument.	Behavior otherwise is
very similar to the C<ListenDatagram> directive above.',
        'type' => 'list'
      },
      'ListenSpecial',
      {
        'cargo' => {
          'type' => 'leaf',
          'value_type' => 'uniline'
        },
        'description' => 'Specifies a special file in the file system to
listen on. This expects an absolute file system path as
argument. Behavior otherwise is very similar to the
C<ListenFIFO> directive above. Use this to
open character device nodes as well as special files in
C</proc/> and
C</sys/>.',
        'type' => 'list'
      },
      'ListenNetlink',
      {
        'cargo' => {
          'type' => 'leaf',
          'value_type' => 'uniline'
        },
        'description' => 'Specifies a Netlink family to create a socket
for to listen on. This expects a short string referring to the
C<AF_NETLINK> family name (such as
C<audit> or C<kobject-uevent>)
as argument, optionally suffixed by a whitespace followed by a
multicast group integer. Behavior otherwise is very similar to
the C<ListenDatagram> directive
above.',
        'type' => 'list'
      },
      'ListenMessageQueue',
      {
        'cargo' => {
          'type' => 'leaf',
          'value_type' => 'uniline'
        },
        'description' => 'Specifies a POSIX message queue name to listen on (see L<mq_overview(7)>
for details). This expects a valid message queue name (i.e. beginning with
C</>). Behavior otherwise is very similar to the C<ListenFIFO>
directive above. On Linux message queue descriptors are actually file descriptors and can be
inherited between processes.',
        'type' => 'list'
      },
      'ListenUSBFunction',
      {
        'cargo' => {
          'type' => 'leaf',
          'value_type' => 'uniline'
        },
        'description' => 'Specifies a L<USB
FunctionFS|https://docs.kernel.org/usb/functionfs.html> endpoints location to listen on, for
implementation of USB gadget functions. This expects an
absolute file system path of a FunctionFS mount point as the argument.
Behavior otherwise is very similar to the C<ListenFIFO>
directive above. Use this to open the FunctionFS endpoint
C<ep0>. When using this option, the
activated service has to have the
C<USBFunctionDescriptors> and
C<USBFunctionStrings> options set.
',
        'type' => 'list'
      },
      'SocketProtocol',
      {
        'choice' => [
          'mptcp',
          'sctp',
          'udplite'
        ],
        'description' => 'Takes one of C<udplite>,
C<sctp> or C<mptcp>. The socket will use
the UDP-Lite (C<IPPROTO_UDPLITE>), SCTP
(C<IPPROTO_SCTP>) or MPTCP
(C<IPPROTO_MPTCP>) protocol, respectively.',
        'type' => 'leaf',
        'value_type' => 'enum'
      },
      'BindIPv6Only',
      {
        'choice' => [
          'both',
          'default',
          'ipv6-only'
        ],
        'description' => 'Takes one of C<default>,
C<both> or C<ipv6-only>. Controls
the IPV6_V6ONLY socket option (see
L<ipv6(7)>
for details). If C<both>, IPv6 sockets bound
will be accessible via both IPv4 and IPv6. If
C<ipv6-only>, they will be accessible via IPv6
only. If C<default> (which is the default,
surprise!), the system wide default setting is used, as
controlled by
C</proc/sys/net/ipv6/bindv6only>, which in
turn defaults to the equivalent of
C<both>.',
        'type' => 'leaf',
        'value_type' => 'enum'
      },
      'Backlog',
      {
        'description' => 'Takes an unsigned 32-bit integer argument. Specifies the number of connections to
queue that have not been accepted yet. This setting matters only for stream and sequential packet
sockets. See
L<listen(2)> for
details. Defaults to 4294967295. Note that this value is silently capped by the
C<net.core.somaxconn> sysctl, which typically defaults to 4096, so typically
the sysctl is the setting that actually matters.',
        'type' => 'leaf',
        'value_type' => 'uniline'
      },
      'BindToDevice',
      {
        'description' => 'Specifies a network interface name to bind this socket to. If set, traffic will only