From d5de8e27cc8e1fb0754c6307683de6f54441a541 Mon Sep 17 00:00:00 2001
From: Darien Raymond <admin@v2ray.com>
Date: Mon, 25 Feb 2019 10:22:04 +0100
Subject: [PATCH] slow down when there is not enough file descriptors. fixes
 #1574

---
 transport/internet/tcp/hub.go | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/transport/internet/tcp/hub.go b/transport/internet/tcp/hub.go
index 15515961..f3e6ade0 100644
--- a/transport/internet/tcp/hub.go
+++ b/transport/internet/tcp/hub.go
@@ -6,6 +6,7 @@ import (
 	"context"
 	gotls "crypto/tls"
 	"strings"
+	"time"
 
 	"v2ray.com/core/common"
 	"v2ray.com/core/common/net"
@@ -64,10 +65,14 @@ func (v *Listener) keepAccepting() {
 	for {
 		conn, err := v.listener.Accept()
 		if err != nil {
-			if strings.Contains(err.Error(), "closed") {
+			errStr := err.Error()
+			if strings.Contains(errStr, "closed") {
 				break
 			}
 			newError("failed to accepted raw connections").Base(err).AtWarning().WriteToLog()
+			if strings.Contains(errStr, "too many") {
+				time.Sleep(time.Millisecond * 500)
+			}
 			continue
 		}