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Set SO_REUSEPORT on multicast input sockets for Apple platforms #6471

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Set SO_REUSEPORT on multicast input sockets for Apple platforms #6471

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8 changes: 6 additions & 2 deletions src/cpp/rtps/transport/UDPv4Transport.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -426,10 +426,14 @@ eProsimaUDPSocket UDPv4Transport::OpenAndBindInputSocket(
if (is_multicast)
{
getSocketPtr(socket)->set_option(ip::udp::socket::reuse_address(true));
#if defined(__QNX__)
// QNX and Apple require SO_REUSEPORT for multiple processes to all
// receive the same multicast datagrams; SO_REUSEADDR alone makes the
// second bind fail (EADDRINUSE) on Darwin. Linux deliberately omitted:
// there SO_REUSEPORT load-balances instead of duplicating delivery.
#if defined(__QNX__) || defined(__APPLE__)
getSocketPtr(socket)->set_option(asio::detail::socket_option::boolean<
ASIO_OS_DEF(SOL_SOCKET), SO_REUSEPORT>(true));
#endif // if defined(__QNX__)
#endif // if defined(__QNX__) || defined(__APPLE__)
}
else
{
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8 changes: 6 additions & 2 deletions src/cpp/rtps/transport/UDPv6Transport.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -427,10 +427,14 @@ eProsimaUDPSocket UDPv6Transport::OpenAndBindInputSocket(
if (is_multicast)
{
getSocketPtr(socket)->set_option(ip::udp::socket::reuse_address(true));
#if defined(__QNX__)
// QNX and Apple require SO_REUSEPORT for multiple processes to all
// receive the same multicast datagrams; SO_REUSEADDR alone makes the
// second bind fail (EADDRINUSE) on Darwin. Linux deliberately omitted:
// there SO_REUSEPORT load-balances instead of duplicating delivery.
#if defined(__QNX__) || defined(__APPLE__)
getSocketPtr(socket)->set_option(asio::detail::socket_option::boolean<
ASIO_OS_DEF(SOL_SOCKET), SO_REUSEPORT>(true));
#endif // if defined(__QNX__)
#endif // if defined(__QNX__) || defined(__APPLE__)
}
else
{
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