uv: fix setsockopt for multicast options

Float patch to fix setsockopt for multicast on Solaris and derivatives.
Original commit message:

  solaris: fix setsockopt for multicast options

  On Solaris and derivatives such as SmartOS, the length of socket options
  for multicast and ttl options is not always sizeof(char).

  This fixes the udp_options and udp_options6 tests.

Ref: libuv/libuv#243

Reviewed-By: Julien Gilli <julien.gilli@joyent.com>
PR-URL: #9179

deps/uv/src/unix/udp.c

@@ -601,40 +601,47 @@ int uv_udp_set_membership(uv_udp_t* handle,
   }
 }
 
-
-static int uv__setsockopt_maybe_char(uv_udp_t* handle,
-                                     int option4,
-                                     int option6,
-                                     int val) {
+static int uv__setsockopt(uv_udp_t* handle,
+                         int option4,
+                         int option6,
+                         const void* val,
+                         size_t size) {
   int r;
-#if defined(__sun) || defined(_AIX)
-  char arg = val;
-#else
-  int arg = val;
-#endif
-
-  if (val < 0 || val > 255)
-    return -EINVAL;
 
   if (handle->flags & UV_HANDLE_IPV6)
     r = setsockopt(handle->io_watcher.fd,
                    IPPROTO_IPV6,
                    option6,
-                   &arg,
-                   sizeof(arg));
+                   val,
+                   size);
   else
     r = setsockopt(handle->io_watcher.fd,
                    IPPROTO_IP,
                    option4,
-                   &arg,
-                   sizeof(arg));
-
+                   val,
+                   size);
   if (r)
     return -errno;
 
   return 0;
 }
 
+static int uv__setsockopt_maybe_char(uv_udp_t* handle,
+                                     int option4,
+                                     int option6,
+                                     int val) {
+#if defined(__sun) || defined(_AIX)
+  char arg = val;
+#else
+  int arg = val;
+#endif
+
+  if (val < 0 || val > 255)
+    return -EINVAL;
+
+  return uv__setsockopt(handle, option4, option6, &arg, sizeof(arg));
+}
+
 
 int uv_udp_set_broadcast(uv_udp_t* handle, int on) {
   if (setsockopt(handle->io_watcher.fd,
@@ -653,6 +660,20 @@ int uv_udp_set_ttl(uv_udp_t* handle, int ttl) {
   if (ttl < 1 || ttl > 255)
     return -EINVAL;
 
+/*
+ * On Solaris and derivatives such as SmartOS, the length of socket options
+ * is sizeof(int) for IP_TTL and IPV6_UNICAST_HOPS,
+ * so hardcode the size of these options on this platform,
+ * and use the general uv__setsockopt_maybe_char call on other platforms.
+ */
+#if defined(__sun)
+  return uv__setsockopt(handle,
+                        IP_TTL,
+                        IPV6_UNICAST_HOPS,
+                        &ttl,
+                        sizeof(ttl));
+#endif /* defined(__sun) */
+
   return uv__setsockopt_maybe_char(handle,
                                    IP_TTL,
                                    IPV6_UNICAST_HOPS,
@@ -661,6 +682,21 @@ int uv_udp_set_ttl(uv_udp_t* handle, int ttl) {
 
 
 int uv_udp_set_multicast_ttl(uv_udp_t* handle, int ttl) {
+/*
+ * On Solaris and derivatives such as SmartOS, the length of socket options
+ * is sizeof(int) for IPV6_MULTICAST_HOPS and sizeof(char) for
+ * IP_MULTICAST_TTL, so hardcode the size of the option in the IPv6 case,
+ * and use the general uv__setsockopt_maybe_char call otherwise.
+ */
+#if defined(__sun)
+  if (handle->flags & UV_HANDLE_IPV6)
+    return uv__setsockopt(handle,
+                          IP_MULTICAST_TTL,
+                          IPV6_MULTICAST_HOPS,
+                          &ttl,
+                          sizeof(ttl));
+#endif /* defined(__sun) */
+
   return uv__setsockopt_maybe_char(handle,
                                    IP_MULTICAST_TTL,
                                    IPV6_MULTICAST_HOPS,
@@ -669,6 +705,21 @@ int uv_udp_set_multicast_ttl(uv_udp_t* handle, int ttl) {
 
 
 int uv_udp_set_multicast_loop(uv_udp_t* handle, int on) {
+/*
+ * On Solaris and derivatives such as SmartOS, the length of socket options
+ * is sizeof(int) for IPV6_MULTICAST_LOOP and sizeof(char) for
+ * IP_MULTICAST_LOOP, so hardcode the size of the option in the IPv6 case,
+ * and use the general uv__setsockopt_maybe_char call otherwise.
+ */
+#if defined(__sun)
+  if (handle->flags & UV_HANDLE_IPV6)
+    return uv__setsockopt(handle,
+                          IP_MULTICAST_LOOP,
+                          IPV6_MULTICAST_LOOP,
+                          &on,
+                          sizeof(on));
+#endif /* defined(__sun) */
+
   return uv__setsockopt_maybe_char(handle,
                                    IP_MULTICAST_LOOP,
                                    IPV6_MULTICAST_LOOP,