Set multicast errors correctly

If the system does not support SSM, but the source address is specified,
the error is unsupported socket operation, not unsupported protocol.

if setsockopt() returns an error we don't know about, set the error
code/string to unknown error

1 files changed, 4 insertions, 2 deletions

diff --git a/src/network/socket/qnativesocketengine_unix.cpp b/src/network/socket/qnativesocketengine_unix.cpp
index 512cd34..4be45b8 100644
--- a/src/network/socket/qnativesocketengine_unix.cpp
+++ b/src/network/socket/qnativesocketengine_unix.cpp
@@ -634,9 +634,9 @@ static bool doMulticast(QNativeSocketEnginePrivate *d,
             ssm4.imr_multiaddr.s_addr = htonl(groupAddress.toIPv4Address());
             ssm4.imr_sourceaddr.s_addr = htonl(sourceAddress.toIPv4Address());
 #else
-            // unreachable
+            // system doesn't support SSM
             d->setError(QAbstractSocket::UnsupportedSocketOperationError,
-                        QNativeSocketEnginePrivate::ProtocolUnsupportedErrorString);
+                        QNativeSocketEnginePrivate::OperationUnsupportedErrorString);
             return false;
 #endif
         } else {
@@ -675,6 +675,8 @@ static bool doMulticast(QNativeSocketEnginePrivate *d,
                         QNativeSocketEnginePrivate::OperationUnsupportedErrorString);
             break;
         default:
+            d->setError(QAbstractSocket::UnknownSocketError,
+                        QNativeSocketEnginePrivate::UnknownSocketErrorString);
             break;
         }
         return false;