receive: implement flush semantics

1 files changed, 24 insertions, 0 deletions

diff --git a/tun/operateonfd.go b/tun/operateonfd.go
new file mode 100644
index 0000000..31747a2
--- /dev/null
+++ b/tun/operateonfd.go
@@ -0,0 +1,24 @@
+// +build !windows
+
+/* SPDX-License-Identifier: MIT
+ *
+ * Copyright (C) 2017-2019 WireGuard LLC. All Rights Reserved.
+ */
+
+package tun
+
+import (
+	"fmt"
+)
+
+func (tun *NativeTun) operateOnFd(fn func(fd uintptr)) {
+	sysconn, err := tun.tunFile.SyscallConn()
+	if err != nil {
+		tun.errors <- fmt.Errorf("unable to find sysconn for tunfile: %s", err.Error())
+		return
+	}
+	err = sysconn.Control(fn)
+	if err != nil {
+		tun.errors <- fmt.Errorf("unable to control sysconn for tunfile: %s", err.Error())
+	}
+}