sockets.h: Add SOCKET_LIST_DGRAM

Change-Id: Ifc00b12403a105307fa12d14a52c6566094ba7c0
diff --git a/sockets.c b/sockets.c
index ef35220..e1f7ad3 100644
--- a/sockets.c
+++ b/sockets.c
@@ -750,6 +750,9 @@
     else
         ai.ai_flags |= AI_CANONNAME;
 
+    if (flags & SOCKET_LIST_DGRAM)
+        ai.ai_socktype = SOCK_DGRAM;
+
     while (1) {
         struct addrinfo  hints = ai;
 
diff --git a/sockets.h b/sockets.h
index 785a37e..6ce3041 100644
--- a/sockets.h
+++ b/sockets.h
@@ -258,7 +258,8 @@
 enum {
     SOCKET_LIST_PASSIVE    = (1 << 0),
     SOCKET_LIST_FORCE_INET = (1 << 1),
-    SOCKET_LIST_FORCE_IN6  = (1 << 2)
+    SOCKET_LIST_FORCE_IN6  = (1 << 2),
+    SOCKET_LIST_DGRAM      = (1 << 3),
 };
 
 /* resolve a host and service/port name into a list of SockAddress objects.