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<h1>SignalHandler.h</h1><a href="SignalHandler_8h.html">Go to the documentation of this file.</a><div class="fragment"><pre class="fragment"><a name="l00001"></a>00001
<a name="l00002"></a>00002 <span class="comment">// -*- mode: c++; c-basic-offset:4 -*-</span>
<a name="l00003"></a>00003
<a name="l00004"></a>00004 <span class="comment">// This file is part of libdap, A C++ implementation of the OPeNDAP Data</span>
<a name="l00005"></a>00005 <span class="comment">// Access Protocol.</span>
<a name="l00006"></a>00006
<a name="l00007"></a>00007 <span class="comment">// Copyright (c) 2002,2003 OPeNDAP, Inc.</span>
<a name="l00008"></a>00008 <span class="comment">// Author: James Gallagher <jgallagher@opendap.org></span>
<a name="l00009"></a>00009 <span class="comment">//</span>
<a name="l00010"></a>00010 <span class="comment">// This library is free software; you can redistribute it and/or</span>
<a name="l00011"></a>00011 <span class="comment">// modify it under the terms of the GNU Lesser General Public</span>
<a name="l00012"></a>00012 <span class="comment">// License as published by the Free Software Foundation; either</span>
<a name="l00013"></a>00013 <span class="comment">// version 2.1 of the License, or (at your option) any later version.</span>
<a name="l00014"></a>00014 <span class="comment">//</span>
<a name="l00015"></a>00015 <span class="comment">// This library is distributed in the hope that it will be useful,</span>
<a name="l00016"></a>00016 <span class="comment">// but WITHOUT ANY WARRANTY; without even the implied warranty of</span>
<a name="l00017"></a>00017 <span class="comment">// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU</span>
<a name="l00018"></a>00018 <span class="comment">// Lesser General Public License for more details.</span>
<a name="l00019"></a>00019 <span class="comment">//</span>
<a name="l00020"></a>00020 <span class="comment">// You should have received a copy of the GNU Lesser General Public</span>
<a name="l00021"></a>00021 <span class="comment">// License along with this library; if not, write to the Free Software</span>
<a name="l00022"></a>00022 <span class="comment">// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA</span>
<a name="l00023"></a>00023 <span class="comment">//</span>
<a name="l00024"></a>00024 <span class="comment">// You can contact OPeNDAP, Inc. at PO Box 112, Saunderstown, RI. 02874-0112.</span>
<a name="l00025"></a>00025
<a name="l00026"></a>00026 <span class="preprocessor">#ifndef signal_handler_h</span>
<a name="l00027"></a>00027 <span class="preprocessor"></span><span class="preprocessor">#define signal_handler_h</span>
<a name="l00028"></a>00028 <span class="preprocessor"></span>
<a name="l00029"></a>00029 <span class="preprocessor">#include <signal.h></span>
<a name="l00030"></a>00030
<a name="l00031"></a>00031 <span class="preprocessor">#include "<a class="code" href="EventHandler_8h.html">EventHandler.h</a>"</span>
<a name="l00032"></a>00032 <span class="preprocessor">#include "<a class="code" href="InternalErr_8h.html">InternalErr.h</a>"</span>
<a name="l00033"></a>00033
<a name="l00034"></a>00034 <span class="keyword">namespace </span>libdap
<a name="l00035"></a>00035 {
<a name="l00036"></a>00036
<a name="l00037"></a><a class="code" href="namespacelibdap.html#a9d529378270ad490952b2b3352935ed">00037</a> <span class="keyword">typedef</span> <span class="keywordtype">void</span> <a class="code" href="namespacelibdap.html#a9d529378270ad490952b2b3352935ed">Sigfunc</a>(<span class="keywordtype">int</span>); <span class="comment">// Plauger, 1992</span>
<a name="l00038"></a>00038
<a name="l00066"></a><a class="code" href="classlibdap_1_1SignalHandler.html">00066</a> <span class="keyword">class </span><a class="code" href="classlibdap_1_1SignalHandler.html">SignalHandler</a>
<a name="l00067"></a>00067 {
<a name="l00068"></a>00068 <span class="keyword">private</span>:
<a name="l00069"></a>00069 <span class="comment">// Ensure we're a Singleton.</span>
<a name="l00070"></a>00070 <a class="code" href="classlibdap_1_1SignalHandler.html">SignalHandler</a>()
<a name="l00071"></a>00071 {}
<a name="l00072"></a>00072
<a name="l00073"></a>00073 <span class="comment">// Singleton pointer.</span>
<a name="l00074"></a>00074 <span class="keyword">static</span> <a class="code" href="classlibdap_1_1SignalHandler.html">SignalHandler</a> *d_instance;
<a name="l00075"></a>00075
<a name="l00076"></a>00076 <span class="comment">// Table of pointers to instances of EventHandlers. Since EventHandler is</span>
<a name="l00077"></a>00077 <span class="comment">// abstract, the pointers will actually reference instances that are</span>
<a name="l00078"></a>00078 <span class="comment">// children of EventHandler. NSIG is defined in signal.h but this may be</span>
<a name="l00079"></a>00079 <span class="comment">// a portability issue.</span>
<a name="l00080"></a>00080 <span class="keyword">static</span> <a class="code" href="classlibdap_1_1EventHandler.html">EventHandler</a> *d_signal_handlers[NSIG];
<a name="l00081"></a>00081
<a name="l00082"></a>00082 <span class="comment">// This array holds the old signal handlers. Once the handler in</span>
<a name="l00083"></a>00083 <span class="comment">// d_signal_handler[signum] is run, look here to see what the original</span>
<a name="l00084"></a>00084 <span class="comment">// action was. This is important since libdap++ is often embedded in code</span>
<a name="l00085"></a>00085 <span class="comment">// that already has a non-default signal handler for things like SIGINT.</span>
<a name="l00086"></a>00086 <span class="keyword">static</span> <a class="code" href="namespacelibdap.html#a9d529378270ad490952b2b3352935ed">Sigfunc</a> *d_old_handlers[NSIG];
<a name="l00087"></a>00087
<a name="l00088"></a>00088 <span class="comment">// Entry point adapter installed into sigaction(). This must be static</span>
<a name="l00089"></a>00089 <span class="comment">// method (or a regular C-function) to conform to sigaction's interface.</span>
<a name="l00090"></a>00090 <span class="comment">// this is the part of SignalHandler that uses the Adapter pattern.</span>
<a name="l00091"></a>00091 <span class="keyword">static</span> <span class="keywordtype">void</span> dispatcher(<span class="keywordtype">int</span> signum);
<a name="l00092"></a>00092
<a name="l00093"></a>00093 <span class="comment">// Delete the global instance. Call this with atexit().</span>
<a name="l00094"></a>00094 <span class="keyword">static</span> <span class="keywordtype">void</span> delete_instance();
<a name="l00095"></a>00095
<a name="l00096"></a>00096 <span class="comment">// Call this using pthread_once() to ensure there's only one instance</span>
<a name="l00097"></a>00097 <span class="comment">// when running in a MT world.</span>
<a name="l00098"></a>00098 <span class="keyword">static</span> <span class="keywordtype">void</span> initialize_instance();
<a name="l00099"></a>00099
<a name="l00100"></a><a class="code" href="classlibdap_1_1SignalHandler.html#6856f863c401edb2bf3b0b147a5008f6">00100</a> <span class="keyword">friend</span> <span class="keyword">class </span><a class="code" href="classlibdap_1_1SignalHandler.html#6856f863c401edb2bf3b0b147a5008f6">SignalHandlerTest</a>;
<a name="l00101"></a><a class="code" href="classlibdap_1_1SignalHandler.html#76bd6ce419aad54c8c87e993f5bd11c9">00101</a> <span class="keyword">friend</span> <span class="keyword">class </span><a class="code" href="classlibdap_1_1SignalHandler.html#76bd6ce419aad54c8c87e993f5bd11c9">HTTPCacheTest</a>;
<a name="l00102"></a>00102
<a name="l00103"></a>00103 <span class="keyword">public</span>:
<a name="l00104"></a>00104 <span class="keyword">static</span> <a class="code" href="classlibdap_1_1SignalHandler.html">SignalHandler</a> *<a class="code" href="classlibdap_1_1SignalHandler.html#930f996d318cadd5f0875da0784cb32a">instance</a>();
<a name="l00105"></a>00105
<a name="l00107"></a><a class="code" href="classlibdap_1_1SignalHandler.html#3aafd093a1a3e93f144cd9e0b048a60d">00107</a> <span class="keyword">virtual</span> <a class="code" href="classlibdap_1_1SignalHandler.html#3aafd093a1a3e93f144cd9e0b048a60d">~SignalHandler</a>()
<a name="l00108"></a>00108 {}
<a name="l00109"></a>00109
<a name="l00110"></a>00110 <a class="code" href="classlibdap_1_1EventHandler.html">EventHandler</a> *<a class="code" href="classlibdap_1_1SignalHandler.html#1188177d392bdc1db6cf4450132c6d9f">register_handler</a>(<span class="keywordtype">int</span> signum, <a class="code" href="classlibdap_1_1EventHandler.html">EventHandler</a> *eh,
<a name="l00111"></a>00111 <span class="keywordtype">bool</span> <span class="keyword">override</span> = <span class="keyword">false</span>);
<a name="l00112"></a>00112
<a name="l00113"></a>00113 <a class="code" href="classlibdap_1_1EventHandler.html">EventHandler</a> *<a class="code" href="classlibdap_1_1SignalHandler.html#c9a9ddb318ad6b372604a4c8d58481de">remove_handler</a>(<span class="keywordtype">int</span> signum);
<a name="l00114"></a>00114 };
<a name="l00115"></a>00115
<a name="l00116"></a>00116 } <span class="comment">// namespace libdap</span>
<a name="l00117"></a>00117
<a name="l00118"></a>00118 <span class="preprocessor">#endif // signal_handler_h</span>
</pre></div></div>
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