improve: checking ev->pending_eof before peeking data from tcp buffer

src/subsys/ngx_subsys_lua_util.c.tt2

@@ -3611,6 +3611,50 @@ ngx_[% subsys %]_lua_check_broken_connection([% req_type %] *r,
 [% END %]
     }
 
+#endif
+
+#if (NGX_HAVE_EPOLLRDHUP)
+
+    if ((ngx_event_flags & NGX_USE_EPOLL_EVENT) && ngx_use_epoll_rdhup) {
+        socklen_t len;
+
+        if (!ev->pending_eof) {
+            return NGX_OK;
+        }
+
+        ev->eof = 1;
+        c->error = 1;
+
+        err = 0;
+        len = sizeof(ngx_err_t);
+
+        /*
+         * BSDs and Linux return 0 and set a pending error in err
+         * Solaris returns -1 and sets errno
+         */
+
+        if (getsockopt(c->fd, SOL_SOCKET, SO_ERROR, (void *) &err, &len)
+            == -1)
+        {
+            err = ngx_socket_errno;
+        }
+
+        if (err) {
+            ev->error = 1;
+        }
+
+        ngx_log_error(NGX_LOG_INFO, ev->log, err,
+                      "epoll_wait() reported that client prematurely closed "
+                      "connection");
+
+[% IF http_subsys %]
+        return NGX_HTTP_CLIENT_CLOSED_REQUEST;
+
+[% ELSIF stream_subsys %]
+        return NGX_ERROR;
+[% END %]
+    }
+
 #endif
 
     n = recv(c->fd, buf, 1, MSG_PEEK);