new file mode 100644
--- /dev/null
+++ b/src/event/ngx_event_udp.h
@@ -0,0 +1,43 @@
+
+/*
+ * Copyright (C) Nginx, Inc.
+ */
+
+
+#ifndef _NGX_EVENT_UDP_H_INCLUDED_
+#define _NGX_EVENT_UDP_H_INCLUDED_
+
+
+#include <ngx_config.h>
+#include <ngx_core.h>
+
+
+#if !(NGX_WIN32)
+
+typedef struct {
+    ngx_buf_t                 *buffer;
+    struct sockaddr           *sockaddr;
+    socklen_t                  socklen;
+} ngx_udp_dgram_t;
+
+
+struct ngx_udp_connection_s {
+    ngx_rbtree_node_t          node;
+    ngx_connection_t          *connection;
+    ngx_str_t                  key;
+    ngx_udp_dgram_t           *dgram;
+};
+
+
+void ngx_event_recvmsg(ngx_event_t *ev);
+void ngx_udp_rbtree_insert_value(ngx_rbtree_node_t *temp,
+    ngx_rbtree_node_t *node, ngx_rbtree_node_t *sentinel);
+void ngx_insert_udp_connection(ngx_connection_t *c, ngx_udp_connection_t *udp,
+    ngx_str_t *key);
+
+#endif
+
+void ngx_delete_udp_connection(void *data);
+
+
+#endif /* _NGX_EVENT_UDP_H_INCLUDED_ */