--- a/src/os/unix/ngx_os.h
+++ b/src/os/unix/ngx_os.h
@@ -25,6 +25,7 @@ typedef ngx_chain_t *(*ngx_send_chain_pt
 typedef struct {
     ngx_recv_pt        recv;
     ngx_recv_chain_pt  recv_chain;
+    ngx_recv_pt        udp_recv;
     ngx_send_pt        send;
     ngx_send_chain_pt  send_chain;
     ngx_uint_t         flags;
@@ -41,6 +42,7 @@ ngx_int_t ngx_daemon(ngx_log_t *log);
 
 ssize_t ngx_unix_recv(ngx_connection_t *c, u_char *buf, size_t size);
 ssize_t ngx_readv_chain(ngx_connection_t *c, ngx_chain_t *entry);
+ssize_t ngx_udp_unix_recv(ngx_connection_t *c, u_char *buf, size_t size);
 ssize_t ngx_unix_send(ngx_connection_t *c, u_char *buf, size_t size);
 ngx_chain_t *ngx_writev_chain(ngx_connection_t *c, ngx_chain_t *in,
     off_t limit);