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<title>Predefined Constants</title>
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<h1>Predefined Constants</h1>
<p class="simpara">
The constants below are defined by this extension, and
will only be available when the extension has either
been compiled into PHP or dynamically loaded at runtime.
</p>
<p class="para">
<table class="doctable table">
<caption><strong>System V message constants</strong></caption>
<thead>
<tr>
<th>Constant</th>
<th>Type</th>
<th>Changelog</th>
</tr>
</thead>
<tbody class="tbody">
<tr>
<td>MSG_IPC_NOWAIT</td>
<td><span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span></td>
<td class="empty"> </td>
</tr>
<tr>
<td>MSG_EAGAIN</td>
<td><span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span></td>
<td>As of 5.2.0</td>
</tr>
<tr>
<td>MSG_ENOMSG</td>
<td><span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span></td>
<td>As of 5.2.0</td>
</tr>
<tr>
<td>MSG_NOERROR</td>
<td><span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span></td>
<td class="empty"> </td>
</tr>
<tr>
<td>MSG_EXCEPT</td>
<td><span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span></td>
<td class="empty"> </td>
</tr>
</tbody>
</table>
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