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-<table class="head">
- <tr>
- <td class="head-ltitle">SIGEVENT(3)</td>
- <td class="head-vol">Library Functions Manual</td>
- <td class="head-rtitle">SIGEVENT(3)</td>
- </tr>
-</table>
-<div class="manual-text">
-<section class="Sh">
-<h1 class="Sh" id="NAME"><a class="permalink" href="#NAME">NAME</a></h1>
-<p class="Pp"><code class="Nm">sigevent</code> &#x2014;
- <span class="Nd">asynchronous event notification</span></p>
-</section>
-<section class="Sh">
-<h1 class="Sh" id="SYNOPSIS"><a class="permalink" href="#SYNOPSIS">SYNOPSIS</a></h1>
-<p class="Pp"><code class="In">#include
- &lt;<a class="In">signal.h</a>&gt;</code></p>
-</section>
-<section class="Sh">
-<h1 class="Sh" id="DESCRIPTION"><a class="permalink" href="#DESCRIPTION">DESCRIPTION</a></h1>
-<p class="Pp">Some operations permit threads to request asynchronous
- notification of events via a <var class="Vt">struct sigevent</var>
- structure. This structure contains several fields that describe the
- requested notification:</p>
-<table class="Bl-column">
- <tr id="Type">
- <td><a class="permalink" href="#Type"><b class="Sy">Type</b></a></td>
- <td><a class="permalink" href="#Member"><b class="Sy" id="Member">Member</b></a></td>
- <td><a class="permalink" href="#Description"><b class="Sy" id="Description">Description</b></a></td>
- </tr>
- <tr>
- <td><var class="Vt">int</var></td>
- <td>sigev_notify</td>
- <td>notification method</td>
- </tr>
- <tr>
- <td><var class="Vt">int</var></td>
- <td>sigev_signo</td>
- <td>signal number</td>
- </tr>
- <tr>
- <td><var class="Vt">union sigval</var></td>
- <td>sigev_value</td>
- <td>signal value</td>
- </tr>
- <tr>
- <td><var class="Vt">int</var></td>
- <td>sigev_notify_kqueue</td>
- <td><a class="Xr">kqueue(2)</a> file descriptor</td>
- </tr>
- <tr>
- <td><var class="Vt">unsigned short</var></td>
- <td>sigev_notify_kevent_flags</td>
- <td>kevent flags</td>
- </tr>
- <tr>
- <td><var class="Vt">lwpid_t</var></td>
- <td>sigev_notify_thread_id</td>
- <td>LWP ID</td>
- </tr>
- <tr>
- <td><var class="Vt">void (*)(union sigval)</var></td>
- <td>sigev_notify_function</td>
- <td>callback function pointer</td>
- </tr>
- <tr>
- <td><var class="Vt">pthread_attr_t *</var></td>
- <td>sigev_notify_attributes</td>
- <td>callback thread attributes</td>
- </tr>
-</table>
-<p class="Pp">The <var class="Va">sigev_notify</var> field specifies the
- notification method used when the event triggers:</p>
-<dl class="Bl-tag">
- <dt id="SIGEV_NONE"><a class="permalink" href="#SIGEV_NONE"><code class="Dv">SIGEV_NONE</code></a></dt>
- <dd>No notification is sent.</dd>
- <dt id="SIGEV_SIGNAL"><a class="permalink" href="#SIGEV_SIGNAL"><code class="Dv">SIGEV_SIGNAL</code></a></dt>
- <dd>The signal <var class="Va">sigev_signo</var> is queued as a real-time
- signal to the calling process. The value stored in
- <var class="Va">sigev_value</var> will be present in the
- <var class="Va">si_value</var> of the <var class="Vt">siginfo_t</var>
- structure of the queued signal.</dd>
- <dt id="SIGEV_THREAD"><a class="permalink" href="#SIGEV_THREAD"><code class="Dv">SIGEV_THREAD</code></a></dt>
- <dd>The notification function in <var class="Va">sigev_notify_function</var>
- is called in a separate thread context. The thread is created with the
- attributes specified in <var class="Va">*sigev_notify_attributes</var>.
- The value stored in <var class="Va">sigev_value</var> is passed as the
- sole argument to <var class="Va">sigev_notify_function</var>. If
- <var class="Va">sigev_notify_attributes</var> is
- <code class="Dv">NULL</code>, the thread is created with default
- attributes.</dd>
- <dt id="SIGEV_KEVENT"><a class="permalink" href="#SIGEV_KEVENT"><code class="Dv">SIGEV_KEVENT</code></a></dt>
- <dd>A new kevent is posted to the kqueue
- <var class="Va">sigev_notify_kqueue</var>. The <var class="Va">udata</var>
- member of the kevent structure contains the value stored in
- <var class="Va">sigev_value</var>. The meaning of other fields in the
- kevent are specific to the type of triggered event.</dd>
- <dt id="SIGEV_THREAD_ID"><a class="permalink" href="#SIGEV_THREAD_ID"><code class="Dv">SIGEV_THREAD_ID</code></a></dt>
- <dd>The signal <var class="Va">sigev_signo</var> is queued to the thread whose
- LWP ID is <var class="Va">sigev_notify_thread_id</var>. The value stored
- in <var class="Va">sigev_value</var> will be present in the
- <var class="Va">si_value</var> of the <var class="Vt">siginfo_t</var>
- structure of the queued signal.</dd>
-</dl>
-</section>
-<section class="Sh">
-<h1 class="Sh" id="NOTES"><a class="permalink" href="#NOTES">NOTES</a></h1>
-<p class="Pp">Note that programs wishing to use
- <code class="Dv">SIGEV_THREAD</code> notifications must link against the
- <span class="Lb">POSIX Real-time Library (librt, -lrt)</span>.</p>
-</section>
-<section class="Sh">
-<h1 class="Sh" id="SEE_ALSO"><a class="permalink" href="#SEE_ALSO">SEE
- ALSO</a></h1>
-<p class="Pp"><a class="Xr">aio_read(2)</a>, <a class="Xr">mq_notify(2)</a>,
- <a class="Xr">timer_create(2)</a>, <a class="Xr">siginfo(3)</a></p>
-</section>
-<section class="Sh">
-<h1 class="Sh" id="STANDARDS"><a class="permalink" href="#STANDARDS">STANDARDS</a></h1>
-<p class="Pp">The <var class="Vt">struct sigevent</var> type conforms to
- <span class="St">IEEE Std 1003.1-2004 (&#x201C;POSIX.1&#x201D;)</span>.</p>
-</section>
-<section class="Sh">
-<h1 class="Sh" id="HISTORY"><a class="permalink" href="#HISTORY">HISTORY</a></h1>
-<p class="Pp">The <var class="Va">sigevent</var> structure first appeared in
- <span class="Ux">FreeBSD 3.3</span>.</p>
-</section>
-</div>
-<table class="foot">
- <tr>
- <td class="foot-date">February 25, 2020</td>
- <td class="foot-os">FreeBSD 15.0</td>
- </tr>
-</table>