From 8699412a4c4f7d5f081fc6c13cfcba000f40560b Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=E4=B8=96=E7=95=8C?= <i@sekai.icu>
Date: Sun, 9 Apr 2023 22:32:15 +0800
Subject: [PATCH] platform: Add stderr redirect

---
 experimental/libbox/command_log.go |  2 +-
 experimental/libbox/log.go         | 29 +++++++++++++++++++++++++++++
 2 files changed, 30 insertions(+), 1 deletion(-)
 create mode 100644 experimental/libbox/log.go

diff --git a/experimental/libbox/command_log.go b/experimental/libbox/command_log.go
index b70e9884..851f0ed3 100644
--- a/experimental/libbox/command_log.go
+++ b/experimental/libbox/command_log.go
@@ -63,7 +63,7 @@ func (s *CommandServer) handleLogConn(conn net.Conn) error {
 	for {
 		select {
 		case <-ctx.Done():
-			return ctx.Err()
+			return nil
 		case message := <-subscription:
 			err = writeLog(conn, []byte(message))
 			if err != nil {
diff --git a/experimental/libbox/log.go b/experimental/libbox/log.go
new file mode 100644
index 00000000..58d78edb
--- /dev/null
+++ b/experimental/libbox/log.go
@@ -0,0 +1,29 @@
+//go:build darwin || linux
+
+package libbox
+
+import (
+	"os"
+
+	"golang.org/x/sys/unix"
+)
+
+var stderrFile *os.File
+
+func RedirectStderr(path string) error {
+	if stats, err := os.Stat(path); err == nil && stats.Size() > 0 {
+		_ = os.Rename(path, path+".old")
+	}
+	outputFile, err := os.Create(path)
+	if err != nil {
+		return err
+	}
+	err = unix.Dup2(int(outputFile.Fd()), int(os.Stderr.Fd()))
+	if err != nil {
+		outputFile.Close()
+		os.Remove(outputFile.Name())
+		return err
+	}
+	stderrFile = outputFile
+	return nil
+}