fix: FIx windows build

proxyd/backend_probe.go

@@ -56,7 +56,7 @@ func probeDialer() *net.Dialer {
 	dialer := &net.Dialer{
 		Control: func(network, address string, c syscall.RawConn) error {
 			return c.Control(func(fd uintptr) {
-				_ = syscall.SetsockoptLinger(int(fd), syscall.SOL_SOCKET, syscall.SO_LINGER, &syscall.Linger{Onoff: 1, Linger: 1})
+				_ = setSockOptLinger(int(fd))
 			})
 		},
 	}

proxyd/backend_syscall.go

@@ -0,0 +1,10 @@
+//go:build !windows
+
+package proxyd
+
+import "syscall"
+
+func setSockOptLinger(fd int) error {
+	// Unix only
+	return syscall.SetsockoptLinger(fd, syscall.SOL_SOCKET, syscall.SO_LINGER, &syscall.Linger{Onoff: 1, Linger: 1})
+}

proxyd/backend_syscall_windows.go

@@ -0,0 +1,8 @@
+//go:build !windows
+
+package proxyd
+
+func setSockOptLinger(fd int) error {
+	// setSockOptLinger is not supported on Windows
+	return nil
+}