sal/osl/all/signalshared.cxx

   1 /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
   2 /*
   3  * This file is part of the LibreOffice project.
   4  *
   5  * This Source Code Form is subject to the terms of the Mozilla Public
   6  * License, v. 2.0. If a copy of the MPL was not distributed with this
   7  * file, You can obtain one at http://mozilla.org/MPL/2.0/.
   8  *
   9  * This file incorporates work covered by the following license notice:
  10  *
  11  *   Licensed to the Apache Software Foundation (ASF) under one or more
  12  *   contributor license agreements. See the NOTICE file distributed
  13  *   with this work for additional information regarding copyright
  14  *   ownership. The ASF licenses this file to you under the Apache
  15  *   License, Version 2.0 (the "License"); you may not use this file
  16  *   except in compliance with the License. You may obtain a copy of
  17  *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
  18  */
  19
  20 #include <sal/config.h>
  21
  22 #include <stdlib.h>
  23
  24 #include <signalshared.hxx>
  25
  26 #include <osl/diagnose.h>
  27 #include <mutex>
  28
  29 namespace
  30 {
  31 oslSignalHandlerImpl* SignalList;
  32 bool bInitSignal = false;
  33
  34 std::mutex& getSignalMutex()
  35 {
  36     static std::mutex aMutex;
  37     return aMutex;
  38 }
  39 }
  40
  41 oslSignalAction callSignalHandler(oslSignalInfo* pInfo)
  42 {
  43     oslSignalHandlerImpl* pHandler = SignalList;
  44     oslSignalAction Action = osl_Signal_ActCallNextHdl;
  45
  46     while (pHandler)
  47     {
  48         if ((Action = pHandler->Handler(pHandler->pData, pInfo)) != osl_Signal_ActCallNextHdl)
  49             break;
  50
  51         pHandler = pHandler->pNext;
  52     }
  53
  54     return Action;
  55 }
  56
  57 oslSignalHandler SAL_CALL osl_addSignalHandler(oslSignalHandlerFunction handler, void* pData)
  58 {
  59     if (!handler)
  60         return nullptr;
  61
  62     oslSignalHandlerImpl* pHandler
  63         = static_cast<oslSignalHandlerImpl*>(calloc(1, sizeof(oslSignalHandlerImpl)));
  64
  65     std::scoped_lock aGuard(getSignalMutex());
  66
  67     if (!bInitSignal)
  68         bInitSignal = onInitSignal();
  69
  70     if (pHandler)
  71     {
  72         pHandler->Handler = handler;
  73         pHandler->pData = pData;
  74
  75         pHandler->pNext = SignalList;
  76         SignalList = pHandler;
  77
  78         return pHandler;
  79     }
  80
  81     return nullptr;
  82 }
  83
  84 sal_Bool SAL_CALL osl_removeSignalHandler(oslSignalHandler handler)
  85 {
  86     std::scoped_lock aGuard(getSignalMutex());
  87
  88     if (!bInitSignal)
  89         bInitSignal = onInitSignal();
  90
  91     oslSignalHandlerImpl* pHandler = SignalList;
  92     oslSignalHandlerImpl* pPrevious = nullptr;
  93
  94     while (pHandler)
  95     {
  96         if (pHandler == handler)
  97         {
  98             if (pPrevious)
  99                 pPrevious->pNext = pHandler->pNext;
 100             else
 101                 SignalList = pHandler->pNext;
 102
 103             if (SignalList == nullptr)
 104                 bInitSignal = onDeInitSignal();
 105
 106             free(pHandler);
 107
 108             return true;
 109         }
 110
 111         pPrevious = pHandler;
 112         pHandler = pHandler->pNext;
 113     }
 114
 115     return false;
 116 }
 117
 118 oslSignalAction SAL_CALL osl_raiseSignal(sal_Int32 userSignal, void* userData)
 119 {
 120     std::scoped_lock aGuard(getSignalMutex());
 121
 122     if (!bInitSignal)
 123         bInitSignal = onInitSignal();
 124
 125     oslSignalInfo info;
 126     info.Signal = osl_Signal_User;
 127     info.UserSignal = userSignal;
 128     info.UserData = userData;
 129
 130     oslSignalAction action = callSignalHandler(&info);
 131
 132     return action;
 133 }
 134
 135 sal_Bool SAL_CALL osl_setErrorReporting(sal_Bool /*bEnable*/)
 136 {
 137     // this is part of the stable API
 138     return false;
 139 }
 140
 141 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */