Fix close platform tun

experimental/libbox/service.go

@@ -75,7 +75,11 @@ func (w *platformInterfaceWrapper) OpenTun(options tun.Options, platformOptions
 	if err != nil {
 		return nil, err
 	}
-	options.FileDescriptor = int(tunFd)
+	dupFd, err := syscall.Dup(int(tunFd))
+	if err != nil {
+		return nil, E.Cause(err, "dup tun file descriptor")
+	}
+	options.FileDescriptor = dupFd
 	return tun.New(options)
 }
 

go.mod

@@ -28,7 +28,7 @@ require (
 	github.com/sagernet/sing-dns v0.1.4
 	github.com/sagernet/sing-shadowsocks v0.1.2-0.20230221080503-769c01d6bba9
 	github.com/sagernet/sing-shadowtls v0.1.0
-	github.com/sagernet/sing-tun v0.1.2
+	github.com/sagernet/sing-tun v0.1.3-0.20230313113643-839f1792e46c
 	github.com/sagernet/sing-vmess v0.1.3
 	github.com/sagernet/smux v0.0.0-20230312102458-337ec2a5af37
 	github.com/sagernet/tfo-go v0.0.0-20230303015439-ffcfd8c41cf9

go.sum

@@ -117,8 +117,8 @@ github.com/sagernet/sing-shadowsocks v0.1.2-0.20230221080503-769c01d6bba9 h1:qS3
 github.com/sagernet/sing-shadowsocks v0.1.2-0.20230221080503-769c01d6bba9/go.mod h1:f3mHTy5shnVM9l8UocMlJgC/1G/zdj5FuEuVXhDinGU=
 github.com/sagernet/sing-shadowtls v0.1.0 h1:05MYce8aR5xfKIn+y7xRFsdKhKt44QZTSEQW+lG5IWQ=
 github.com/sagernet/sing-shadowtls v0.1.0/go.mod h1:Kn1VUIprdkwCgkS6SXYaLmIpKzQbqBIKJBMY+RvBhYc=
-github.com/sagernet/sing-tun v0.1.2 h1:jiz4PJkdNf8yAdpKe8EolaKNQzL9a2/fI4ZHQOqhANc=
-github.com/sagernet/sing-tun v0.1.2/go.mod h1:KnRkwaDHbb06zgeNPu0LQ8A+vA9myMxKEgHN1brCPHg=
+github.com/sagernet/sing-tun v0.1.3-0.20230313113643-839f1792e46c h1:k504OwD5yQHUb13tSsdRAB6GjtS2WjIygAThElAO6MY=
+github.com/sagernet/sing-tun v0.1.3-0.20230313113643-839f1792e46c/go.mod h1:KnRkwaDHbb06zgeNPu0LQ8A+vA9myMxKEgHN1brCPHg=
 github.com/sagernet/sing-vmess v0.1.3 h1:q/+tsF46dvvapL6CpQBgPHJ6nQrDUZqEtLHCbsjO7iM=
 github.com/sagernet/sing-vmess v0.1.3/go.mod h1:GVXqAHwe9U21uS+Voh4YBIrADQyE4F9v0ayGSixSQAE=
 github.com/sagernet/smux v0.0.0-20230312102458-337ec2a5af37 h1:HuE6xSwco/Xed8ajZ+coeYLmioq0Qp1/Z2zczFaV8as=