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internal/integrations/udp/reuse_windows.go

@@ -0,0 +1,14 @@
+//go:build windows
+
+package udp
+
+import "golang.org/x/sys/windows"
+
+// setSocketReuse enables SO_REUSEADDR on the socket before bind so that
+// multiple processes (HamLog + Log4OM + …) can listen on the same UDP
+// multicast port. Without it, Windows fails the second bind with
+// WSAEADDRINUSE ("Une seule utilisation de chaque adresse de socket…").
+func setSocketReuse(fd uintptr) error {
+	return windows.SetsockoptInt(windows.Handle(fd),
+		windows.SOL_SOCKET, windows.SO_REUSEADDR, 1)
+}