reference/sockets/functions/socket-get-option.xml
eb1f12738221677a2d94d94e8dbddd88c6143c94
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<row>
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<entry><constant>IP_MULTICAST_LOOP</constant></entry>
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<entry>
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The multicast loopback policy for IPv4 packets, which
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determines whether multicast packets sent by this socket also reach
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receivers in the same host that have joined the same multicast group
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on the outgoing interface used by this socket. This is the case by
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default.
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The multicast loopback policy for IPv4 packets enables or disables
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loopback of outgoing multicasts, which must have been previously joined.
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The effect differs, however, whether it applies on unixes or Windows,
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the former being on the receive path whereas the latter being
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on the send path.
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</entry>
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<entry>
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<type>int</type> (either <literal>0</literal> or
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<row>
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<entry><constant>TCP_NOTSENT_LOWAT</constant></entry>
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<entry>
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Sets how much unsent data by the socket stream. (Linux only)
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Sets the limit number of unsent data in write queue by the socket stream. (Linux only)
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</entry>
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<entry>
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<type>int</type>
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