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<div id="projectname">Crypto++
 <span id="projectnumber">7.0</span>
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<div id="projectbrief">Free C++ class library of cryptographic schemes</div>
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<div class="title">DebugTrapHandler Class Reference</div> </div>
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<p>Default SIGTRAP handler.
<a href="class_debug_trap_handler.html#details">More...</a></p>
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<img id="dynsection-0-trigger" src="closed.png" alt="+"/> Inheritance diagram for DebugTrapHandler:</div>
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<img src="class_debug_trap_handler.png" usemap="#DebugTrapHandler_map" alt=""/>
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<area href="struct_signal_handler.html" alt="SignalHandler< SIGILL, false >" shape="rect" coords="0,0,189,24"/>
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<tr class="heading"><td colspan="2"><h2 class="groupheader"><a name="inherited"></a>
Additional Inherited Members</h2></td></tr>
<tr class="inherit_header pub_methods_struct_signal_handler"><td colspan="2" onclick="javascript:toggleInherit('pub_methods_struct_signal_handler')"><img src="closed.png" alt="-"/> Public Member Functions inherited from <a class="el" href="struct_signal_handler.html">SignalHandler< SIGILL, false ></a></td></tr>
<tr class="memitem:acd307684154846febeedf1b605f69486 inherit pub_methods_struct_signal_handler"><td class="memItemLeft" align="right" valign="top"> </td><td class="memItemRight" valign="bottom"><a class="el" href="struct_signal_handler.html#acd307684154846febeedf1b605f69486">SignalHandler</a> (<a class="el" href="ossig_8h.html#a487b4e7d6c7251a7b9a5fa0fbeebbf86">SignalHandlerFn</a> pfn=NULL, int flags=0)</td></tr>
<tr class="memdesc:acd307684154846febeedf1b605f69486 inherit pub_methods_struct_signal_handler"><td class="mdescLeft"> </td><td class="mdescRight">Construct a signal handler. <a href="struct_signal_handler.html#acd307684154846febeedf1b605f69486">More...</a><br /></td></tr>
<tr class="separator:acd307684154846febeedf1b605f69486 inherit pub_methods_struct_signal_handler"><td class="memSeparator" colspan="2"> </td></tr>
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<a name="details" id="details"></a><h2 class="groupheader">Detailed Description</h2>
<div class="textblock"><p>Default SIGTRAP handler. </p>
<p><a class="el" href="class_debug_trap_handler.html" title="Default SIGTRAP handler. ">DebugTrapHandler()</a> can be used by a program to install an empty SIGTRAP handler. If present, the handler ensures there is a signal handler in place for <code>SIGTRAP</code> raised by <code>CRYPTOPP_ASSERT</code>. If <code>CRYPTOPP_ASSERT</code> raises <code>SIGTRAP</code> <em>without</em> a handler, then one of two things can occur. First, the OS might allow the program to continue. Second, the OS might terminate the program. OS X allows the program to continue, while some Linuxes terminate the program.</p>
<p>If <a class="el" href="class_debug_trap_handler.html" title="Default SIGTRAP handler. ">DebugTrapHandler</a> detects another handler in place, then it will not install a handler. This ensures a debugger can gain control of the <code>SIGTRAP</code> signal without contention. It also allows multiple <a class="el" href="class_debug_trap_handler.html" title="Default SIGTRAP handler. ">DebugTrapHandler</a> to be created without contentious or unusual behavior. Though multiple <a class="el" href="class_debug_trap_handler.html" title="Default SIGTRAP handler. ">DebugTrapHandler</a> can be created, a program should only create one, if needed.</p>
<p>A <a class="el" href="class_debug_trap_handler.html" title="Default SIGTRAP handler. ">DebugTrapHandler</a> is subject to C++ static initialization [dis]order. If you need to install a handler and it must be installed early, then reference the code associated with <code>CRYPTOPP_INIT_PRIORITY</code> in <a class="el" href="cryptlib_8cpp_source.html">cryptlib.cpp</a> and <a class="el" href="cpu_8cpp_source.html">cpu.cpp</a>.</p>
<p>If you want to ensure <code>CRYPTOPP_ASSERT</code> is inert, then <em>do not</em> define <code>CRYPTOPP_DEBUG</code>, <code>DEBUG</code> or <code>_DEBUG</code>. Avoiding the defines means <code>CRYPTOPP_ASSERT</code> is processed into <code>((void)(exp))</code>.</p>
<p>The traditional Posix define <code>NDEBUG</code> has no effect on <code>CRYPTOPP_DEBUG</code>, <code>CRYPTOPP_ASSERT</code> or <a class="el" href="class_debug_trap_handler.html" title="Default SIGTRAP handler. ">DebugTrapHandler</a>.</p>
<p>An example of using <a class="el" href="trap_8h.html#adf3b392588bc94cbeae9f415a78c7b95">CRYPTOPP_ASSERT</a> and <a class="el" href="class_debug_trap_handler.html" title="Default SIGTRAP handler. ">DebugTrapHandler</a> is shown below. The library's test program, <code>cryptest.exe</code> (from test.cpp), exercises the structure: </p><pre>
#if defined(CRYPTOPP_DEBUG) && defined(UNIX_SIGNALS_AVAILABLE)
static const <a class="el" href="class_debug_trap_handler.html" title="Default SIGTRAP handler. ">DebugTrapHandler</a> g_dummyHandler;
#endif</pre><pre> int main(int argc, char* argv[])
{
CRYPTOPP_ASSERT(argv != nullptr);
...
}
</pre> <dl class="section since"><dt>Since</dt><dd>Crypto++ 5.6.5 </dd></dl>
<dl class="section see"><dt>See also</dt><dd><a class="el" href="trap_8h.html#adf3b392588bc94cbeae9f415a78c7b95">CRYPTOPP_ASSERT</a>, <a class="el" href="struct_signal_handler.html" title="Signal handler for Linux and Unix compatibles. ">SignalHandler</a>, <a href="http://github.com/weidai11/cryptopp/issues/277">Issue 277</a>, <a href="http://seclists.org/oss-sec/2016/q3/520">CVE-2016-7420</a> </dd></dl>
<p class="definition">Definition at line <a class="el" href="trap_8h_source.html#l00135">135</a> of file <a class="el" href="trap_8h_source.html">trap.h</a>.</p>
</div><hr/>The documentation for this class was generated from the following file:<ul>
<li><a class="el" href="trap_8h_source.html">trap.h</a></li>
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