devdocs/c/program%2Fsig_atomic_t.html


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    <h1 id="firstHeading" class="firstHeading">sig_atomic_t</h1>            <table class="t-dcl-begin"> <tr class="t-dsc-header"> <th> Defined in header <code>&lt;signal.h&gt;</code> </th> <th> </th> <th> </th> </tr> <tr class="t-dcl"> <td class="t-dcl-nopad"> <pre data-language="c">typedef /* unspecified */ sig_atomic_t;</pre>
</td> <td class="t-dcl-nopad"> </td> <td class="t-dcl-nopad"> </td> </tr>  </table> <p>An integer type which can be accessed as an atomic entity even in the presence of asynchronous interrupts made by signals.</p>
<h3 id="Example"> Example</h3> <div class="t-example"> <div class="c source-c"><pre data-language="c">#include &lt;signal.h&gt;
#include &lt;stdio.h&gt;
 
volatile sig_atomic_t gSignalStatus = 0;
 
void signal_handler(int status)
{
    gSignalStatus = status;
}
 
int main(void)
{
    /* Install a signal handler. */
    signal(SIGINT, signal_handler);
 
    printf("SignalValue:    %d\n", gSignalStatus);
    printf("Sending signal: %d\n", SIGINT);
    raise(SIGINT);
    printf("SignalValue:    %d\n", gSignalStatus);
}</pre></div> <p>Possible output:</p>
<div class="text source-text"><pre data-language="c">SignalValue:    0
Sending signal: 2
SignalValue:    2</pre></div> </div> <h3 id="References"> References</h3>  <ul>
<li> C17 standard (ISO/IEC 9899:2018): </li>
<ul><li> 7.14/2 Signal handling &lt;signal.h&gt; (p: 194-195) </li></ul>
<li> C11 standard (ISO/IEC 9899:2011): </li>
<ul><li> 7.14/2 Signal handling &lt;signal.h&gt; (p: 265) </li></ul>
<li> C99 standard (ISO/IEC 9899:1999): </li>
<ul><li> 7.14/2 Signal handling &lt;signal.h&gt; (p: 246) </li></ul>
<li> C89/C90 standard (ISO/IEC 9899:1990): </li>
<ul><li> 4.7 SIGNAL HANDLING &lt;signal.h&gt; </li></ul>
</ul>               <h3 id="See_also"> See also</h3> <table class="t-dsc-begin"> <tr class="t-dsc"> <td> <div><a href="signal" title="c/program/signal"> <span class="t-lines"><span>signal</span></span></a></div> </td> <td> sets a signal handler for particular signal <br> <span class="t-mark">(function)</span>  </td>
</tr> <tr class="t-dsc"> <td colspan="2"> <span><a href="https://en.cppreference.com/w/cpp/utility/program/sig_atomic_t" title="cpp/utility/program/sig atomic t">C++ documentation</a></span> for <code>sig_atomic_t</code> </td>
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