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<td> <div>Defined in header <code><stdlib.h></code>
</div></td>
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<td> <div><span class="mw-geshi c source-c"><span class="kw4">void</span> ignore_handler_s<span class="br0">(</span> <span class="kw4">const</span> <span class="kw4">char</span> <span class="sy2">*</span> <span class="kw4">restrict</span> msg,<br />
<p>                       <span class="kw4">void</span> <span class="sy2">*</span> <span class="kw4">restrict</span> ptr,<br />
                       errno_t error<br />
</p>
                     <span class="br0">)</span><span class="sy4">;</span></span></div></td>
<td class="t-dcl-nopad"> </td>
<td> <span class="t-mark-rev t-since-c11">(since C11)</span> </td>
</tr>
<tr class="t-dcl-sep"><td></td><td></td><td></td></tr>
</tbody></table>
<p>The function simply returns to the caller without performing any other action.
</p><p>A pointer to this function can be passed to <a href="set_constraint_handler_s.html" title="c/error/set constraint handler s">set_constraint_handler_s</a> to establish a runtime constraints violation handler that does nothing.
</p>
<dl><dd>As with all bounds-checked functions, <code>ignore_handler_s</code> is only guaranteed to be available if <span class="t-c"><span class="mw-geshi c source-c">__STDC_LIB_EXT1__</span></span> is defined by the implementation and if the user defines <span class="t-c"><span class="mw-geshi c source-c">__STDC_WANT_LIB_EXT1__</span></span> to the integer constant <span class="t-c"><span class="mw-geshi c source-c"><span class="nu0">1</span></span></span> before including <code><stdlib.h></code>.
</dd></dl>
<table id="toc" class="toc"><tr><td><div id="toctitle"><h2>Contents</h2></div>
<ul>
<li class="toclevel-1 tocsection-1"><a href="ignore_handler_s.html#Parameters"><span class="tocnumber">1</span> <span class="toctext">Parameters</span></a></li>
<li class="toclevel-1 tocsection-2"><a href="ignore_handler_s.html#Return_value"><span class="tocnumber">2</span> <span class="toctext">Return value</span></a></li>
<li class="toclevel-1 tocsection-3"><a href="ignore_handler_s.html#Notes"><span class="tocnumber">3</span> <span class="toctext">Notes</span></a></li>
<li class="toclevel-1 tocsection-4"><a href="ignore_handler_s.html#Example"><span class="tocnumber">4</span> <span class="toctext">Example</span></a></li>
<li class="toclevel-1 tocsection-5"><a href="ignore_handler_s.html#References"><span class="tocnumber">5</span> <span class="toctext">References</span></a></li>
<li class="toclevel-1 tocsection-6"><a href="ignore_handler_s.html#See_also"><span class="tocnumber">6</span> <span class="toctext">See also</span></a></li>
</ul>
</td></tr></table>
<h3><span class="editsection">[<a href="http://en.cppreference.com/mwiki/index.php?title=c/error/ignore_handler_s&action=edit&section=1" title="Edit section: Parameters">edit</a>]</span> <span class="mw-headline" id="Parameters">Parameters</span></h3>
<table class="t-par-begin">
<tr class="t-par">
<td> msg
</td>
<td> -
</td>
<td> pointer to character string that describes the error
</td></tr>
<tr class="t-par">
<td> ptr
</td>
<td> -
</td>
<td> pointer to an implementation-defined object or a null pointer. Examples of implementation-defined objects are objects that give the name of the function that detected the violation and the line number when the violation was detected
</td></tr>
<tr class="t-par">
<td> error
</td>
<td> -
</td>
<td> the error about to be returned by the calling function, if it happens to be one of the functions that return errno_t
</td></tr></table>
<h3><span class="editsection">[<a href="http://en.cppreference.com/mwiki/index.php?title=c/error/ignore_handler_s&action=edit&section=2" title="Edit section: Return value">edit</a>]</span> <span class="mw-headline" id="Return_value">Return value</span></h3>
<p>(none)
</p>
<h3><span class="editsection">[<a href="http://en.cppreference.com/mwiki/index.php?title=c/error/ignore_handler_s&action=edit&section=3" title="Edit section: Notes">edit</a>]</span> <span class="mw-headline" id="Notes">Notes</span></h3>
<p>If <code>ignore_handler_s</code> is used as a the runtime constraints handler, the violations may be detected by examining the results of the bounds-checked function calls, which may be different for different functions (non-zero <span class="t-lc">errno_t</span>, null character written to the first byte of the output string, etc)
</p><p>If <code>set_constraint_handler_s</code> is never called, the default handler is implementation-defined: it may be <span class="t-lc">abort_handler_s</span>, <span class="t-lc">ignore_handler_s</span>, or some other implementation-defined handler.
</p>
<h3><span class="editsection">[<a href="http://en.cppreference.com/mwiki/index.php?title=c/error/ignore_handler_s&action=edit&section=4" title="Edit section: Example">edit</a>]</span> <span class="mw-headline" id="Example">Example</span></h3>
<div class="t-example"><div class="t-example-live-link"><div class="coliru-btn coliru-btn-run-init">Run this code</div></div>
<div dir="ltr" class="mw-geshi" style="text-align: left;"><div class="c source-c"><pre class="de1"><span class="co2">#define __STDC_WANT_LIB_EXT1__ 1</span>
<span class="co2">#include <string.h></span>
<span class="co2">#include <stdio.h></span>
<span class="co2">#include <stdlib.h></span>
 
<span class="kw4">int</span> main<span class="br0">(</span><span class="kw4">void</span><span class="br0">)</span>
<span class="br0">{</span>
<span class="co2">#ifdef __STDC_LIB_EXT1__</span>
<span class="kw4">char</span> dst<span class="br0">[</span><span class="nu0">2</span><span class="br0">]</span><span class="sy4">;</span>
set_constraint_handler_s<span class="br0">(</span>ignore_handler_s<span class="br0">)</span><span class="sy4">;</span>
<span class="kw4">int</span> r <span class="sy1">=</span> strcpy_s<span class="br0">(</span>dst, <span class="kw4">sizeof</span> dst, <span class="st0">"Too long!"</span><span class="br0">)</span><span class="sy4">;</span>
<a href="../io/fprintf.html"><span class="kw851">printf</span></a><span class="br0">(</span><span class="st0">"dst = <span class="es1">\"</span>%s<span class="es1">\"</span>, r = %d<span class="es1">\n</span>"</span>, dst, r<span class="br0">)</span><span class="sy4">;</span>
set_constraint_handler_s<span class="br0">(</span>abort_handler_s<span class="br0">)</span><span class="sy4">;</span>
r <span class="sy1">=</span> strcpy_s<span class="br0">(</span>dst, <span class="kw4">sizeof</span> dst, <span class="st0">"Too long!"</span><span class="br0">)</span><span class="sy4">;</span>
<a href="../io/fprintf.html"><span class="kw851">printf</span></a><span class="br0">(</span><span class="st0">"dst = <span class="es1">\"</span>%s<span class="es1">\"</span>, r = %d<span class="es1">\n</span>"</span>, dst, r<span class="br0">)</span><span class="sy4">;</span>
<span class="co2">#endif</span>
<span class="br0">}</span></pre></div></div>
<p>Possible output:
</p>
<div dir="ltr" class="mw-geshi" style="text-align: left;"><div class="text source-text"><pre class="de1">dst = "", r = 22
abort_handler_s was called in response to a runtime-constraint violation.
 
The runtime-constraint violation was caused by the following expression in strcpy_s:
(s1max <= (s2_len=strnlen_s(s2, s1max)) ) (in string_s.c:62)
 
Note to end users: This program was terminated as a result
of a bug present in the software. Please reach out to your
software's vendor to get more help.
Aborted</pre></div></div>
</div>
<h3><span class="editsection">[<a href="http://en.cppreference.com/mwiki/index.php?title=c/error/ignore_handler_s&action=edit&section=5" title="Edit section: References">edit</a>]</span> <span class="mw-headline" id="References">References</span></h3>
<div class="t-ref-std-11">
<ul><li> C11 standard (ISO/IEC 9899:2011):
</li></ul>
<dl><dd><ul><li> K.3.6.1.3 The ignore_handler_s function (p: 606)
</li></ul>
</dd></dl>
</div>
<h3><span class="editsection">[<a href="http://en.cppreference.com/mwiki/index.php?title=c/error/ignore_handler_s&action=edit&section=6" title="Edit section: See also">edit</a>]</span> <span class="mw-headline" id="See_also">See also</span></h3>
<table class="t-dsc-begin">
<tr class="t-dsc">
<td> <div class="t-dsc-member-div"><div><a href="abort_handler_s.html" title="c/error/abort handler s"> <span class="t-lines"><span>abort_handler_s</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-c11">(C11)</span></span></span></div></div>
</td>
<td> abort callback for the bounds-checked functions <br /> <span class="t-mark">(function)</span> <span class="editsection noprint plainlinks" title="Edit this template"><a rel="nofollow" class="external text" href="http://en.cppreference.com/mwiki/index.php?title=Template:c/error/abort_handler_s&action=edit">[edit]</a></span>
</td></tr>
<tr class="t-dsc">
<td> <div class="t-dsc-member-div"><div><a href="set_constraint_handler_s.html" title="c/error/set constraint handler s"> <span class="t-lines"><span>set_constraint_handler_s</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-c11">(C11)</span></span></span></div></div>
</td>
<td> set the error callback for bounds-checked functions <br /> <span class="t-mark">(function)</span> <span class="editsection noprint plainlinks" title="Edit this template"><a rel="nofollow" class="external text" href="http://en.cppreference.com/mwiki/index.php?title=Template:c/error/set_constraint_handler_s&action=edit">[edit]</a></span>
</td></tr>
</table>
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