From 7c9c66601ef427d6eed2389f513585087798c63d Mon Sep 17 00:00:00 2001
From: Darien Raymond <admin@v2ray.com>
Date: Sat, 25 Aug 2018 22:41:36 +0200
Subject: [PATCH] print error

---
 common/buf/readv_windows.go | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/common/buf/readv_windows.go b/common/buf/readv_windows.go
index 8339fdb1..8d376781 100644
--- a/common/buf/readv_windows.go
+++ b/common/buf/readv_windows.go
@@ -2,7 +2,10 @@
 
 package buf
 
-import "syscall"
+import (
+	"fmt"
+	"syscall"
+)
 
 type windowsReader struct {
 	bufs []syscall.WSABuf
@@ -29,6 +32,7 @@ func (r *windowsReader) Read(fd uintptr) int32 {
 	var flags uint32
 	err := syscall.WSARecv(syscall.Handle(fd), &r.bufs[0], uint32(len(r.bufs)), &nBytes, &flags, nil, nil)
 	if err != nil {
+		fmt.Println("Err=", err)
 		return -1
 	}
 	return int32(nBytes)