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<div class="refentry">
<a name="GUnixFDList"></a><div class="titlepage"></div>
<div class="refnamediv"><table width="100%"><tr>
<td valign="top">
<h2><span class="refentrytitle"><a name="GUnixFDList.top_of_page"></a>GUnixFDList</span></h2>
<p>GUnixFDList — An object containing a set of UNIX file descriptors</p>
</td>
<td class="gallery_image" valign="top" align="right"></td>
</tr></table></div>
<div class="refsect1">
<a name="GUnixFDList.functions"></a><h2>Functions</h2>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="functions_return">
<col class="functions_name">
</colgroup>
<tbody>
<tr>
<td class="function_type">
<a class="link" href="GUnixFDList.html" title="GUnixFDList"><span class="returnvalue">GUnixFDList</span></a> *
</td>
<td class="function_name">
<a class="link" href="GUnixFDList.html#g-unix-fd-list-new-from-array" title="g_unix_fd_list_new_from_array ()">g_unix_fd_list_new_from_array</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a class="link" href="GUnixFDList.html" title="GUnixFDList"><span class="returnvalue">GUnixFDList</span></a> *
</td>
<td class="function_name">
<a class="link" href="GUnixFDList.html#g-unix-fd-list-new" title="g_unix_fd_list_new ()">g_unix_fd_list_new</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a href="../glib-Basic-Types.html#gint"><span class="returnvalue">gint</span></a>
</td>
<td class="function_name">
<a class="link" href="GUnixFDList.html#g-unix-fd-list-get-length" title="g_unix_fd_list_get_length ()">g_unix_fd_list_get_length</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a href="../glib-Basic-Types.html#gint"><span class="returnvalue">gint</span></a>
</td>
<td class="function_name">
<a class="link" href="GUnixFDList.html#g-unix-fd-list-get" title="g_unix_fd_list_get ()">g_unix_fd_list_get</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">const <a href="../glib-Basic-Types.html#gint"><span class="returnvalue">gint</span></a> *
</td>
<td class="function_name">
<a class="link" href="GUnixFDList.html#g-unix-fd-list-peek-fds" title="g_unix_fd_list_peek_fds ()">g_unix_fd_list_peek_fds</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a href="../glib-Basic-Types.html#gint"><span class="returnvalue">gint</span></a> *
</td>
<td class="function_name">
<a class="link" href="GUnixFDList.html#g-unix-fd-list-steal-fds" title="g_unix_fd_list_steal_fds ()">g_unix_fd_list_steal_fds</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a href="../glib-Basic-Types.html#gint"><span class="returnvalue">gint</span></a>
</td>
<td class="function_name">
<a class="link" href="GUnixFDList.html#g-unix-fd-list-append" title="g_unix_fd_list_append ()">g_unix_fd_list_append</a> <span class="c_punctuation">()</span>
</td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect1">
<a name="GUnixFDList.other"></a><h2>Types and Values</h2>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="name">
<col class="description">
</colgroup>
<tbody><tr>
<td class="datatype_keyword"> </td>
<td class="function_name"><a class="link" href="GUnixFDList.html#GUnixFDList-struct" title="GUnixFDList">GUnixFDList</a></td>
</tr></tbody>
</table></div>
</div>
<div class="refsect1">
<a name="GUnixFDList.object-hierarchy"></a><h2>Object Hierarchy</h2>
<pre class="screen"> <a href="../gobject-The-Base-Object-Type.html#GObject-struct">GObject</a>
<span class="lineart">╰──</span> GUnixFDList
</pre>
</div>
<div class="refsect1">
<a name="GUnixFDList.includes"></a><h2>Includes</h2>
<pre class="synopsis">#include &lt;gio/gunixfdlist.h&gt;
</pre>
</div>
<div class="refsect1">
<a name="GUnixFDList.description"></a><h2>Description</h2>
<p>A <a class="link" href="GUnixFDList.html" title="GUnixFDList"><span class="type">GUnixFDList</span></a> contains a list of file descriptors. It owns the file
descriptors that it contains, closing them when finalized.</p>
<p>It may be wrapped in a <a class="link" href="GUnixFDMessage.html" title="GUnixFDMessage"><span class="type">GUnixFDMessage</span></a> and sent over a <a class="link" href="GSocket.html" title="GSocket"><span class="type">GSocket</span></a> in
the <code class="literal">G_SOCKET_ADDRESS_UNIX</code> family by using <a class="link" href="GSocket.html#g-socket-send-message" title="g_socket_send_message ()"><code class="function">g_socket_send_message()</code></a>
and received using <a class="link" href="GSocket.html#g-socket-receive-message" title="g_socket_receive_message ()"><code class="function">g_socket_receive_message()</code></a>.</p>
<p>Note that <code class="literal">&lt;gio/gunixfdlist.h&gt;</code> belongs to the UNIX-specific GIO
interfaces, thus you have to use the <code class="literal">gio-unix-2.0.pc</code> pkg-config
file when using it.</p>
</div>
<div class="refsect1">
<a name="GUnixFDList.functions_details"></a><h2>Functions</h2>
<div class="refsect2">
<a name="g-unix-fd-list-new-from-array"></a><h3>g_unix_fd_list_new_from_array ()</h3>
<pre class="programlisting"><a class="link" href="GUnixFDList.html" title="GUnixFDList"><span class="returnvalue">GUnixFDList</span></a> *
g_unix_fd_list_new_from_array (<em class="parameter"><code>const <a href="../glib-Basic-Types.html#gint"><span class="type">gint</span></a> *fds</code></em>,
<em class="parameter"><code><a href="../glib-Basic-Types.html#gint"><span class="type">gint</span></a> n_fds</code></em>);</pre>
<p>Creates a new <a class="link" href="GUnixFDList.html" title="GUnixFDList"><span class="type">GUnixFDList</span></a> containing the file descriptors given in
<em class="parameter"><code>fds</code></em>
. The file descriptors become the property of the new list and
may no longer be used by the caller. The array itself is owned by
the caller.</p>
<p>Each file descriptor in the array should be set to close-on-exec.</p>
<p>If <em class="parameter"><code>n_fds</code></em>
is -1 then <em class="parameter"><code>fds</code></em>
must be terminated with -1.</p>
<div class="refsect3">
<a name="g-unix-fd-list-new-from-array.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>fds</p></td>
<td class="parameter_description"><p> the initial list of file descriptors. </p></td>
<td class="parameter_annotations"><span class="annotation">[<acronym title="Parameter points to an array of items."><span class="acronym">array</span></acronym> length=n_fds]</span></td>
</tr>
<tr>
<td class="parameter_name"><p>n_fds</p></td>
<td class="parameter_description"><p>the length of <span class="type">fds</span>, or -1</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect3">
<a name="g-unix-fd-list-new-from-array.returns"></a><h4>Returns</h4>
<p> a new <a class="link" href="GUnixFDList.html" title="GUnixFDList"><span class="type">GUnixFDList</span></a></p>
</div>
<p class="since">Since: <a class="link" href="api-index-2-24.html#api-index-2.24">2.24</a></p>
</div>
<hr>
<div class="refsect2">
<a name="g-unix-fd-list-new"></a><h3>g_unix_fd_list_new ()</h3>
<pre class="programlisting"><a class="link" href="GUnixFDList.html" title="GUnixFDList"><span class="returnvalue">GUnixFDList</span></a> *
g_unix_fd_list_new (<em class="parameter"><code><span class="type">void</span></code></em>);</pre>
<p>Creates a new <a class="link" href="GUnixFDList.html" title="GUnixFDList"><span class="type">GUnixFDList</span></a> containing no file descriptors.</p>
<div class="refsect3">
<a name="g-unix-fd-list-new.returns"></a><h4>Returns</h4>
<p> a new <a class="link" href="GUnixFDList.html" title="GUnixFDList"><span class="type">GUnixFDList</span></a></p>
</div>
<p class="since">Since: <a class="link" href="api-index-2-24.html#api-index-2.24">2.24</a></p>
</div>
<hr>
<div class="refsect2">
<a name="g-unix-fd-list-get-length"></a><h3>g_unix_fd_list_get_length ()</h3>
<pre class="programlisting"><a href="../glib-Basic-Types.html#gint"><span class="returnvalue">gint</span></a>
g_unix_fd_list_get_length (<em class="parameter"><code><a class="link" href="GUnixFDList.html" title="GUnixFDList"><span class="type">GUnixFDList</span></a> *list</code></em>);</pre>
<p>Gets the length of <em class="parameter"><code>list</code></em>
(ie: the number of file descriptors
contained within).</p>
<div class="refsect3">
<a name="g-unix-fd-list-get-length.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody><tr>
<td class="parameter_name"><p>list</p></td>
<td class="parameter_description"><p>a <a class="link" href="GUnixFDList.html" title="GUnixFDList"><span class="type">GUnixFDList</span></a></p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
<div class="refsect3">
<a name="g-unix-fd-list-get-length.returns"></a><h4>Returns</h4>
<p> the length of <em class="parameter"><code>list</code></em>
</p>
</div>
<p class="since">Since: <a class="link" href="api-index-2-24.html#api-index-2.24">2.24</a></p>
</div>
<hr>
<div class="refsect2">
<a name="g-unix-fd-list-get"></a><h3>g_unix_fd_list_get ()</h3>
<pre class="programlisting"><a href="../glib-Basic-Types.html#gint"><span class="returnvalue">gint</span></a>
g_unix_fd_list_get (<em class="parameter"><code><a class="link" href="GUnixFDList.html" title="GUnixFDList"><span class="type">GUnixFDList</span></a> *list</code></em>,
<em class="parameter"><code><a href="../glib-Basic-Types.html#gint"><span class="type">gint</span></a> index_</code></em>,
<em class="parameter"><code><a href="../glib-Error-Reporting.html#GError"><span class="type">GError</span></a> **error</code></em>);</pre>
<p>Gets a file descriptor out of <em class="parameter"><code>list</code></em>
.</p>
<p><em class="parameter"><code>index_</code></em>
specifies the index of the file descriptor to get. It is a
programmer error for <em class="parameter"><code>index_</code></em>
to be out of range; see
<a class="link" href="GUnixFDList.html#g-unix-fd-list-get-length" title="g_unix_fd_list_get_length ()"><code class="function">g_unix_fd_list_get_length()</code></a>.</p>
<p>The file descriptor is duplicated using <code class="function">dup()</code> and set as
close-on-exec before being returned. You must call <code class="function">close()</code> on it
when you are done.</p>
<p>A possible cause of failure is exceeding the per-process or
system-wide file descriptor limit.</p>
<div class="refsect3">
<a name="g-unix-fd-list-get.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>list</p></td>
<td class="parameter_description"><p>a <a class="link" href="GUnixFDList.html" title="GUnixFDList"><span class="type">GUnixFDList</span></a></p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>index_</p></td>
<td class="parameter_description"><p>the index into the list</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>error</p></td>
<td class="parameter_description"><p>a <a href="../glib-Error-Reporting.html#GError"><span class="type">GError</span></a> pointer</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect3">
<a name="g-unix-fd-list-get.returns"></a><h4>Returns</h4>
<p> the file descriptor, or -1 in case of error</p>
</div>
<p class="since">Since: <a class="link" href="api-index-2-24.html#api-index-2.24">2.24</a></p>
</div>
<hr>
<div class="refsect2">
<a name="g-unix-fd-list-peek-fds"></a><h3>g_unix_fd_list_peek_fds ()</h3>
<pre class="programlisting">const <a href="../glib-Basic-Types.html#gint"><span class="returnvalue">gint</span></a> *
g_unix_fd_list_peek_fds (<em class="parameter"><code><a class="link" href="GUnixFDList.html" title="GUnixFDList"><span class="type">GUnixFDList</span></a> *list</code></em>,
<em class="parameter"><code><a href="../glib-Basic-Types.html#gint"><span class="type">gint</span></a> *length</code></em>);</pre>
<p>Returns the array of file descriptors that is contained in this
object.</p>
<p>After this call, the descriptors remain the property of <em class="parameter"><code>list</code></em>
. The
caller must not close them and must not free the array. The array is
valid only until <em class="parameter"><code>list</code></em>
is changed in any way.</p>
<p>If <em class="parameter"><code>length</code></em>
is non-<a href="../glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a> then it is set to the number of file
descriptors in the returned array. The returned array is also
terminated with -1.</p>
<p>This function never returns <a href="../glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a>. In case there are no file
descriptors contained in <em class="parameter"><code>list</code></em>
, an empty array is returned.</p>
<div class="refsect3">
<a name="g-unix-fd-list-peek-fds.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>list</p></td>
<td class="parameter_description"><p>a <a class="link" href="GUnixFDList.html" title="GUnixFDList"><span class="type">GUnixFDList</span></a></p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>length</p></td>
<td class="parameter_description"><p> pointer to the length of the returned
array, or <a href="../glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a>. </p></td>
<td class="parameter_annotations"><span class="annotation">[<acronym title="Parameter for returning results. Default is transfer full."><span class="acronym">out</span></acronym>][<acronym title="NULL is OK, both for passing and for returning."><span class="acronym">allow-none</span></acronym>]</span></td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect3">
<a name="g-unix-fd-list-peek-fds.returns"></a><h4>Returns</h4>
<p> an array of file
descriptors. </p>
<p><span class="annotation">[<acronym title="Parameter points to an array of items."><span class="acronym">array</span></acronym> length=length][<acronym title="Don't free data after the code is done."><span class="acronym">transfer none</span></acronym>]</span></p>
</div>
<p class="since">Since: <a class="link" href="api-index-2-24.html#api-index-2.24">2.24</a></p>
</div>
<hr>
<div class="refsect2">
<a name="g-unix-fd-list-steal-fds"></a><h3>g_unix_fd_list_steal_fds ()</h3>
<pre class="programlisting"><a href="../glib-Basic-Types.html#gint"><span class="returnvalue">gint</span></a> *
g_unix_fd_list_steal_fds (<em class="parameter"><code><a class="link" href="GUnixFDList.html" title="GUnixFDList"><span class="type">GUnixFDList</span></a> *list</code></em>,
<em class="parameter"><code><a href="../glib-Basic-Types.html#gint"><span class="type">gint</span></a> *length</code></em>);</pre>
<p>Returns the array of file descriptors that is contained in this
object.</p>
<p>After this call, the descriptors are no longer contained in
<em class="parameter"><code>list</code></em>
. Further calls will return an empty list (unless more
descriptors have been added).</p>
<p>The return result of this function must be freed with <a href="../glib-Memory-Allocation.html#g-free"><code class="function">g_free()</code></a>.
The caller is also responsible for closing all of the file
descriptors. The file descriptors in the array are set to
close-on-exec.</p>
<p>If <em class="parameter"><code>length</code></em>
is non-<a href="../glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a> then it is set to the number of file
descriptors in the returned array. The returned array is also
terminated with -1.</p>
<p>This function never returns <a href="../glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a>. In case there are no file
descriptors contained in <em class="parameter"><code>list</code></em>
, an empty array is returned.</p>
<div class="refsect3">
<a name="g-unix-fd-list-steal-fds.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>list</p></td>
<td class="parameter_description"><p>a <a class="link" href="GUnixFDList.html" title="GUnixFDList"><span class="type">GUnixFDList</span></a></p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>length</p></td>
<td class="parameter_description"><p> pointer to the length of the returned
array, or <a href="../glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a>. </p></td>
<td class="parameter_annotations"><span class="annotation">[<acronym title="Parameter for returning results. Default is transfer full."><span class="acronym">out</span></acronym>][<acronym title="NULL is OK, both for passing and for returning."><span class="acronym">allow-none</span></acronym>]</span></td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect3">
<a name="g-unix-fd-list-steal-fds.returns"></a><h4>Returns</h4>
<p> an array of file
descriptors. </p>
<p><span class="annotation">[<acronym title="Parameter points to an array of items."><span class="acronym">array</span></acronym> length=length][<acronym title="Free data after the code is done."><span class="acronym">transfer full</span></acronym>]</span></p>
</div>
<p class="since">Since: <a class="link" href="api-index-2-24.html#api-index-2.24">2.24</a></p>
</div>
<hr>
<div class="refsect2">
<a name="g-unix-fd-list-append"></a><h3>g_unix_fd_list_append ()</h3>
<pre class="programlisting"><a href="../glib-Basic-Types.html#gint"><span class="returnvalue">gint</span></a>
g_unix_fd_list_append (<em class="parameter"><code><a class="link" href="GUnixFDList.html" title="GUnixFDList"><span class="type">GUnixFDList</span></a> *list</code></em>,
<em class="parameter"><code><a href="../glib-Basic-Types.html#gint"><span class="type">gint</span></a> fd</code></em>,
<em class="parameter"><code><a href="../glib-Error-Reporting.html#GError"><span class="type">GError</span></a> **error</code></em>);</pre>
<p>Adds a file descriptor to <em class="parameter"><code>list</code></em>
.</p>
<p>The file descriptor is duplicated using <code class="function">dup()</code>. You keep your copy
of the descriptor and the copy contained in <em class="parameter"><code>list</code></em>
will be closed
when <em class="parameter"><code>list</code></em>
is finalized.</p>
<p>A possible cause of failure is exceeding the per-process or
system-wide file descriptor limit.</p>
<p>The index of the file descriptor in the list is returned. If you use
this index with <a class="link" href="GUnixFDList.html#g-unix-fd-list-get" title="g_unix_fd_list_get ()"><code class="function">g_unix_fd_list_get()</code></a> then you will receive back a
duplicated copy of the same file descriptor.</p>
<div class="refsect3">
<a name="g-unix-fd-list-append.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>list</p></td>
<td class="parameter_description"><p>a <a class="link" href="GUnixFDList.html" title="GUnixFDList"><span class="type">GUnixFDList</span></a></p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>fd</p></td>
<td class="parameter_description"><p>a valid open file descriptor</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>error</p></td>
<td class="parameter_description"><p>a <a href="../glib-Error-Reporting.html#GError"><span class="type">GError</span></a> pointer</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect3">
<a name="g-unix-fd-list-append.returns"></a><h4>Returns</h4>
<p> the index of the appended fd in case of success, else -1
(and <em class="parameter"><code>error</code></em>
is set)</p>
</div>
<p class="since">Since: <a class="link" href="api-index-2-24.html#api-index-2.24">2.24</a></p>
</div>
</div>
<div class="refsect1">
<a name="GUnixFDList.other_details"></a><h2>Types and Values</h2>
<div class="refsect2">
<a name="GUnixFDList-struct"></a><h3>GUnixFDList</h3>
<pre class="programlisting">typedef struct _GUnixFDList GUnixFDList;</pre>
<p><a class="link" href="GUnixFDList.html" title="GUnixFDList"><span class="type">GUnixFDList</span></a> is an opaque data structure and can only be accessed
using the following functions.</p>
</div>
</div>
<div class="refsect1">
<a name="GUnixFDList.see-also"></a><h2>See Also</h2>
<p><a class="link" href="GUnixFDMessage.html" title="GUnixFDMessage"><span class="type">GUnixFDMessage</span></a></p>
</div>
</div>
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