new file mode 100644
--- /dev/null
+++ b/src/os/unix/ngx_udp_send.c
@@ -0,0 +1,56 @@
+
+/*
+ * Copyright (C) Igor Sysoev
+ * Copyright (C) Nginx, Inc.
+ */
+
+
+#include <ngx_config.h>
+#include <ngx_core.h>
+#include <ngx_event.h>
+
+
+ssize_t
+ngx_udp_unix_send(ngx_connection_t *c, u_char *buf, size_t size)
+{
+    ssize_t       n;
+    ngx_err_t     err;
+    ngx_event_t  *wev;
+
+    wev = c->write;
+
+    for ( ;; ) {
+        n = sendto(c->fd, buf, size, 0, c->sockaddr, c->socklen);
+
+        ngx_log_debug4(NGX_LOG_DEBUG_EVENT, c->log, 0,
+                       "sendto: fd:%d %z of %uz to \"%V\"",
+                       c->fd, n, size, &c->addr_text);
+
+        if (n >= 0) {
+            if ((size_t) n != size) {
+                wev->error = 1;
+                (void) ngx_connection_error(c, 0, "sendto() incomplete");
+                return NGX_ERROR;
+            }
+
+            c->sent += n;
+
+            return n;
+        }
+
+        err = ngx_socket_errno;
+
+        if (err == NGX_EAGAIN) {
+            wev->ready = 0;
+            ngx_log_debug0(NGX_LOG_DEBUG_EVENT, c->log, NGX_EAGAIN,
+                           "sendto() not ready");
+            return NGX_AGAIN;
+        }
+
+        if (err != NGX_EINTR) {
+            wev->error = 1;
+            (void) ngx_connection_error(c, err, "sendto() failed");
+            return NGX_ERROR;
+        }
+    }
+}