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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"><html><head>  <meta name="generator" content=  "HTML Tidy for Linux/x86 (vers 1 September 2005), see www.w3.org">  <title>signal</title>  <link href="../cppreference.css" rel="stylesheet" type="text/css"></head><body><table>  <tr>  <td>  <div class="body-content">  <div class="header-box">    <a href="../index.html">cppreference.com</a> &gt; <a href=    "index.html">Other Standard C Functions</a> &gt; <a href=    "signal.html">signal</a>  </div>  <div class="name-format">    signal  </div>  <div class="syntax-name-format">    Syntax:  </div>  <pre class="syntax-box">  #include &lt;signal.h&gt;  void ( *signal( int signal, void (* func) (int)) ) (int);</pre>  <p>The signal() function sets <em>func</em> to be called when  <em>signal</em> is recieved by your program. <em>func</em> can be a  custom signal handler, or one of these macros (defined in  signal.h):</p>  <table class="code-table">    <tr>      <th class="code-table-th">Macro</th>      <th class="code-table-th">Explanation</th>    </tr>    <tr>      <td class="code-table-td">SIG_DFL</td>      <td class="code-table-td">default signal handling</td>    </tr>    <tr>      <td class="code-table-td">SIG_IGN</td>      <td class="code-table-td">ignore the signal</td>    </tr>  </table>  <p>Some basic signals that you can attach a signal handler to  are:</p>  <table class="code-table">    <tr>      <th class="code-table-th">Signal</th>      <th class="code-table-th">Description</th>    </tr>    <tr>      <td class="code-table-td">SIGTERM</td>      <td class="code-table-td">Generic stop signal that can be      caught.</td>    </tr>    <tr>      <td class="code-table-td">SIGINT</td>      <td class="code-table-td">Interrupt program, normally      ctrl-c.</td>    </tr>    <tr>      <td class="code-table-td">SIGQUIT</td>      <td class="code-table-td">Interrupt program, similar to      SIGINT.</td>    </tr>    <tr>      <td class="code-table-td">SIGKILL</td>      <td class="code-table-td">Stops the program. Cannot be      caught.</td>    </tr>    <tr>      <td class="code-table-td">SIGHUP</td>      <td class="code-table-td">Reports a disconnected terminal.</td>    </tr>  </table>  <p>The return value of signal() is the address of the previously  defined function for this signal, or SIG_ERR is there is an  error.</p>  <div class="related-examples-format">    Example code:  </div>  <div class="related-examples">    <p>The following example uses the signal() function to call an    arbitrary number of functions when the user aborts the program. The    functions are stored in a vector, and a single &quot;clean-up&quot;    function calls each function in that vector of functions when the    program is aborted:</p>    <pre class="example-code">void f1() {  cout &lt;&lt; &quot;calling f1()...&quot; &lt;&lt; endl;}               void f2() {  cout &lt;&lt; &quot;calling f2()...&quot; &lt;&lt; endl;}               typedef void(*endFunc)(void);vector&lt;endFunc&gt; endFuncs;         void cleanUp( int dummy ) {  for( unsigned int i = 0; i &lt; endFuncs.size(); i++ ) {    endFunc f = endFuncs.at(i);    (*f)();  }  exit(-1);}               int main() {              // connect various signals to our clean-up function  signal( SIGTERM, cleanUp );  signal( SIGINT, cleanUp );  signal( SIGQUIT, cleanUp );  signal( SIGHUP, cleanUp );              // add two specific clean-up functions to a list of functions  endFuncs.push_back( f1 );  endFuncs.push_back( f2 );               // loop until the user breaks  while( 1 );             return 0;}               </pre>  </div>  <div class="related-name-format">    Related topics:  </div>  <div class="related-content">    <a href="raise.html">raise</a>  </div>  </div>  </td>    </tr>  </table></body></html>
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