op-packages/mosdns/patches/212-fix-mlog-fix-log-file-padded-with-null-bytes-after-e.patch

From 0e78ad1d047043f9f3b4f47dea7cf9905ad09a7c Mon Sep 17 00:00:00 2001
From: sbwml <admin@cooluc.com>
Date: Wed, 19 Aug 2026 12:32:48 +0800
Subject: [PATCH 2/2] fix(mlog): fix log file padded with null bytes after
 external truncation

Signed-off-by: sbwml <admin@cooluc.com>
---
 mlog/rotator.go | 11 ++++++++---
 1 file changed, 8 insertions(+), 3 deletions(-)

--- a/mlog/rotator.go
+++ b/mlog/rotator.go
@@ -52,8 +52,13 @@ func (r *Rotator) Write(p []byte) (n int
 
 	writeLen := int64(len(p))
 	if r.MaxSize > 0 && r.size+writeLen > r.MaxSize {
-		if err := r.rotate(); err != nil {
-			return 0, err
+		if info, err := r.f.Stat(); err == nil {
+			r.size = info.Size()
+		}
+		if r.size+writeLen > r.MaxSize {
+			if err := r.rotate(); err != nil {
+				return 0, err
+			}
 		}
 	}
 
@@ -84,7 +89,7 @@ func (r *Rotator) openNew() error {
 	if err != nil {
 		return err
 	}
-	f, err := os.OpenFile(r.Filename, os.O_CREATE|os.O_WRONLY|os.O_TRUNC, 0644)
+	f, err := os.OpenFile(r.Filename, os.O_CREATE|os.O_WRONLY|os.O_TRUNC|os.O_APPEND, 0644)
 	if err != nil {
 		return err
 	}