[GitHub] [incubator-nuttx] btashton commented on a change in pull request #2415: net/igmp: add MULTICAST_TTL support

[GitBox <gi...@apache.org>]

btashton commented on a change in pull request #2415:
URL: https://github.com/apache/incubator-nuttx/pull/2415#discussion_r536557076



##########
File path: net/inet/ipv4_setsockopt.c
##########
@@ -184,16 +189,41 @@ int ipv4_setsockopt(FAR struct socket *psock, int option,
         }
         break;
 
-      /* The following IPv4 socket options are defined, but not implemented */
-
-      case IP_MULTICAST_IF:           /* Set local device for a multicast
-                                       * socket */
       case IP_MULTICAST_TTL:          /* Set/read the time-to-live value of
                                        * outgoing multicast packets */
+        {
+          if (psock->s_type != SOCK_DGRAM ||
+              value_len != sizeof(int))

Review comment:
       This is not correct.  I should be able to use `unsigned char ttl;` as the input to set the ttl.




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