[hal] Initial SystemCore empty HAL (#7454)

hal/src/main/native/systemcore/Relay.cpp

@@ -0,0 +1,47 @@
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
+
+#include "hal/Relay.h"
+
+#include <string>
+
+#include "HALInitializer.h"
+#include "HALInternal.h"
+#include "PortsInternal.h"
+#include "hal/handles/IndexedHandleResource.h"
+
+using namespace hal;
+
+namespace hal::init {
+void InitializeRelay() {}
+}  // namespace hal::init
+
+extern "C" {
+
+HAL_RelayHandle HAL_InitializeRelayPort(HAL_PortHandle portHandle, HAL_Bool fwd,
+                                        const char* allocationLocation,
+                                        int32_t* status) {
+  hal::init::CheckInit();
+  *status = HAL_HANDLE_ERROR;
+  return HAL_kInvalidHandle;
+}
+
+void HAL_FreeRelayPort(HAL_RelayHandle relayPortHandle) {}
+
+HAL_Bool HAL_CheckRelayChannel(int32_t channel) {
+  return false;
+}
+
+void HAL_SetRelay(HAL_RelayHandle relayPortHandle, HAL_Bool on,
+                  int32_t* status) {
+  *status = HAL_HANDLE_ERROR;
+  return;
+}
+
+HAL_Bool HAL_GetRelay(HAL_RelayHandle relayPortHandle, int32_t* status) {
+  *status = HAL_HANDLE_ERROR;
+  return false;
+}
+
+}  // extern "C"