From 2e00c6a32de997f60f216c04983dc774d0d45351 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Dani=C3=ABl=20van=20Eeden?= <git@myname.nl>
Date: Mon, 5 Jul 2021 06:13:28 +0200
Subject: [PATCH] main: Don't log error for syncing /dev/stdout (#25703)

---
 tidb-server/main.go | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/tidb-server/main.go b/tidb-server/main.go
index b249a8a019a25..292f9a707f03c 100644
--- a/tidb-server/main.go
+++ b/tidb-server/main.go
@@ -17,6 +17,7 @@ import (
 	"context"
 	"flag"
 	"fmt"
+	"io/fs"
 	"os"
 	"runtime"
 	"strconv"
@@ -207,6 +208,12 @@ func exit() {
 
 func syncLog() {
 	if err := log.Sync(); err != nil {
+		// Don't complain about /dev/stdout as Fsync will return EINVAL.
+		if pathErr, ok := err.(*fs.PathError); ok {
+			if pathErr.Path == "/dev/stdout" {
+				os.Exit(0)
+			}
+		}
 		fmt.Fprintln(os.Stderr, "sync log err:", err)
 		os.Exit(1)
 	}