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
  28 bool bInitSignal = false;
  29
  30 namespace
  31 {
  32 oslSignalHandlerImpl* SignalList;
  33 oslMutex SignalListMutex;
  34
  35 bool initSignal()
  36 {
  37     SignalListMutex = osl_createMutex();
  38
  39     return onInitSignal();
  40 }
  41
  42 bool deInitSignal()
  43 {
  44     bool bRet = onDeInitSignal();
  45
  46     osl_destroyMutex(SignalListMutex);
  47
  48     return bRet;
  49 }
  50
  51 }
  52
  53 oslSignalAction callSignalHandler(oslSignalInfo* pInfo)
  54 {
  55     oslSignalHandlerImpl* pHandler = SignalList;
  56     oslSignalAction Action = osl_Signal_ActCallNextHdl;
  57
  58     while (pHandler)
  59     {
  60         if ((Action = pHandler->Handler(pHandler->pData, pInfo))
  61                 != osl_Signal_ActCallNextHdl)
  62             break;
  63
  64         pHandler = pHandler->pNext;
  65     }
  66
  67     return Action;
  68 }
  69
  70 oslSignalHandler SAL_CALL osl_addSignalHandler(oslSignalHandlerFunction handler, void* pData)
  71 {
  72     if (!handler)
  73         return nullptr;
  74
  75     if (!bInitSignal)
  76         bInitSignal = initSignal();
  77
  78     oslSignalHandlerImpl* pHandler = static_cast<oslSignalHandlerImpl*>(calloc(1, sizeof(oslSignalHandlerImpl)));
  79
  80     if (pHandler)
  81     {
  82         pHandler->Handler = handler;
  83         pHandler->pData   = pData;
  84
  85         osl_acquireMutex(SignalListMutex);
  86
  87         pHandler->pNext = SignalList;
  88         SignalList      = pHandler;
  89
  90         osl_releaseMutex(SignalListMutex);
  91
  92         return pHandler;
  93     }
  94
  95     return nullptr;
  96 }
  97
  98 sal_Bool SAL_CALL osl_removeSignalHandler(oslSignalHandler handler)
  99 {
 100     if (!bInitSignal)
 101         bInitSignal = initSignal();
 102
 103     osl_acquireMutex(SignalListMutex);
 104
 105     oslSignalHandlerImpl* pHandler = SignalList;
 106     oslSignalHandlerImpl* pPrevious = nullptr;
 107
 108     while (pHandler)
 109     {
 110         if (pHandler == handler)
 111         {
 112             if (pPrevious)
 113                 pPrevious->pNext = pHandler->pNext;
 114             else
 115                 SignalList = pHandler->pNext;
 116
 117             osl_releaseMutex(SignalListMutex);
 118
 119             if (!SignalList)
 120                 bInitSignal = deInitSignal();
 121
 122             free(pHandler);
 123
 124             return true;
 125         }
 126
 127         pPrevious = pHandler;
 128         pHandler  = pHandler->pNext;
 129     }
 130
 131     osl_releaseMutex(SignalListMutex);
 132
 133     return false;
 134 }
 135
 136 oslSignalAction SAL_CALL osl_raiseSignal(sal_Int32 userSignal, void* userData)
 137 {
 138     if (!bInitSignal)
 139         bInitSignal = initSignal();
 140
 141     osl_acquireMutex(SignalListMutex);
 142
 143     oslSignalInfo info;
 144     info.Signal = osl_Signal_User;
 145     info.UserSignal = userSignal;
 146     info.UserData = userData;
 147
 148     oslSignalAction action = callSignalHandler(&info);
 149
 150     osl_releaseMutex(SignalListMutex);
 151
 152     return action;
 153 }
 154
 155 sal_Bool SAL_CALL osl_setErrorReporting( sal_Bool /*bEnable*/ )
 156 {
 157     // this is part of the stable API
 158     return false;
 159 }
 160
 161 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */