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diff --git a/sal/osl/all/signalshared.cxx b/sal/osl/all/signalshared.cxx
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+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * This file incorporates work covered by the following license notice:
+ *
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements. See the NOTICE file distributed
+ * with this work for additional information regarding copyright
+ * ownership. The ASF licenses this file to you under the Apache
+ * License, Version 2.0 (the "License"); you may not use this file
+ * except in compliance with the License. You may obtain a copy of
+ * the License at http://www.apache.org/licenses/LICENSE-2.0 .
+ */
+
+#include <sal/config.h>
+
+#include <stdlib.h>
+
+#include <signalshared.hxx>
+
+#include <osl/diagnose.h>
+
+bool bInitSignal = false;
+
+namespace
+{
+oslSignalHandlerImpl* SignalList;
+oslMutex SignalListMutex;
+
+bool initSignal()
+{
+ SignalListMutex = osl_createMutex();
+
+ return onInitSignal();
+}
+
+bool deInitSignal()
+{
+ bool bRet = onDeInitSignal();
+
+ osl_destroyMutex(SignalListMutex);
+
+ return bRet;
+}
+
+}
+
+oslSignalAction callSignalHandler(oslSignalInfo* pInfo)
+{
+ oslSignalHandlerImpl* pHandler = SignalList;
+ oslSignalAction Action = osl_Signal_ActCallNextHdl;
+
+ while (pHandler)
+ {
+ if ((Action = pHandler->Handler(pHandler->pData, pInfo))
+ != osl_Signal_ActCallNextHdl)
+ break;
+
+ pHandler = pHandler->pNext;
+ }
+
+ return Action;
+}
+
+oslSignalHandler SAL_CALL osl_addSignalHandler(oslSignalHandlerFunction handler, void* pData)
+{
+ if (!handler)
+ return nullptr;
+
+ if (!bInitSignal)
+ bInitSignal = initSignal();
+
+ oslSignalHandlerImpl* pHandler = static_cast<oslSignalHandlerImpl*>(calloc(1, sizeof(oslSignalHandlerImpl)));
+
+ if (pHandler)
+ {
+ pHandler->Handler = handler;
+ pHandler->pData = pData;
+
+ osl_acquireMutex(SignalListMutex);
+
+ pHandler->pNext = SignalList;
+ SignalList = pHandler;
+
+ osl_releaseMutex(SignalListMutex);
+
+ return pHandler;
+ }
+
+ return nullptr;
+}
+
+sal_Bool SAL_CALL osl_removeSignalHandler(oslSignalHandler handler)
+{
+ if (!bInitSignal)
+ bInitSignal = initSignal();
+
+ osl_acquireMutex(SignalListMutex);
+
+ oslSignalHandlerImpl* pHandler = SignalList;
+ oslSignalHandlerImpl* pPrevious = nullptr;
+
+ while (pHandler)
+ {
+ if (pHandler == handler)
+ {
+ if (pPrevious)
+ pPrevious->pNext = pHandler->pNext;
+ else
+ SignalList = pHandler->pNext;
+
+ osl_releaseMutex(SignalListMutex);
+
+ if (!SignalList)
+ bInitSignal = deInitSignal();
+
+ free(pHandler);
+
+ return true;
+ }
+
+ pPrevious = pHandler;
+ pHandler = pHandler->pNext;
+ }
+
+ osl_releaseMutex(SignalListMutex);
+
+ return false;
+}
+
+oslSignalAction SAL_CALL osl_raiseSignal(sal_Int32 userSignal, void* userData)
+{
+ if (!bInitSignal)
+ bInitSignal = initSignal();
+
+ osl_acquireMutex(SignalListMutex);
+
+ oslSignalInfo info;
+ info.Signal = osl_Signal_User;
+ info.UserSignal = userSignal;
+ info.UserData = userData;
+
+ oslSignalAction action = callSignalHandler(&info);
+
+ osl_releaseMutex(SignalListMutex);
+
+ return action;
+}
+
+sal_Bool SAL_CALL osl_setErrorReporting( sal_Bool /*bEnable*/ )
+{
+ // this is part of the stable API
+ return false;
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */