From 9c76d0d74218575c3898ec2e12311800c54c4adc Mon Sep 17 00:00:00 2001
From: Ben Noordhuis <info@bnoordhuis.nl>
Date: Fri, 27 Jan 2012 00:31:13 +0100
Subject: [PATCH] unix: turn on SO_REUSEPORT for UDP sockets

Required on BSD-like systems for local UDP multicast. Without it, the bind()
call fails with EADDRINUSE.
---
 src/unix/udp.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/src/unix/udp.c b/src/unix/udp.c
index 3e5de929..6db0ea10 100644
--- a/src/unix/udp.c
+++ b/src/unix/udp.c
@@ -340,6 +340,14 @@ static int uv__bind(uv_udp_t* handle,
     goto out;
   }
 
+#ifdef SO_REUSEPORT /* Apple's version of SO_REUSEADDR... */
+  yes = 1;
+  if (setsockopt(fd, SOL_SOCKET, SO_REUSEPORT, &yes, sizeof yes) == -1) {
+    uv__set_sys_error(handle->loop, errno);
+    goto out;
+  }
+#endif
+
   if (flags & UV_UDP_IPV6ONLY) {
 #ifdef IPV6_V6ONLY
     yes = 1;