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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> <title>GUnixFDList: GIO Reference Manual</title> <meta name="generator" content="DocBook XSL Stylesheets V1.79.1"> <link rel="home" href="index.html" title="GIO Reference Manual"> <link rel="up" href="networking.html" title="Low-level network support"> <link rel="prev" href="GSocketControlMessage.html" title="GSocketControlMessage"> <link rel="next" href="GUnixFDMessage.html" title="GUnixFDMessage"> <meta name="generator" content="GTK-Doc V1.32 (XML mode)"> <link rel="stylesheet" href="style.css" type="text/css"> </head> <body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"> <table class="navigation" id="top" width="100%" summary="Navigation header" cellpadding="2" cellspacing="5"><tr valign="middle"> <td width="100%" align="left" class="shortcuts"> <a href="#" class="shortcut">Top</a><span id="nav_description"> <span class="dim">|</span> <a href="#GUnixFDList.description" class="shortcut">Description</a></span><span id="nav_hierarchy"> <span class="dim">|</span> <a href="#GUnixFDList.object-hierarchy" class="shortcut">Object Hierarchy</a></span> </td> <td><a accesskey="h" href="index.html"><img src="home.png" width="16" height="16" border="0" alt="Home"></a></td> <td><a accesskey="u" href="networking.html"><img src="up.png" width="16" height="16" border="0" alt="Up"></a></td> <td><a accesskey="p" href="GSocketControlMessage.html"><img src="left.png" width="16" height="16" border="0" alt="Prev"></a></td> <td><a accesskey="n" href="GUnixFDMessage.html"><img src="right.png" width="16" height="16" border="0" alt="Next"></a></td> </tr></table> <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_proto_type"> <col class="functions_proto_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"> <span class="returnvalue">gint</span> </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"> <span class="returnvalue">gint</span> </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 <span class="returnvalue">gint</span> * </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"> <span class="returnvalue">gint</span> * </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"> <span class="returnvalue">gint</span> </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="other_proto_type"> <col class="other_proto_name"> </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"> GObject <span class="lineart">╰──</span> GUnixFDList </pre> </div> <div class="refsect1"> <a name="GUnixFDList.includes"></a><h2>Includes</h2> <pre class="synopsis">#include <gio/gunixfdlist.h> </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 <a class="link" href="GSocketAddress.html#G-SOCKET-FAMILY-UNIX:CAPS"><code class="literal">G_SOCKET_FAMILY_UNIX</code></a> 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"><gio/gunixfdlist.h></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 <span class="type">gint</span> *fds</code></em>, <em class="parameter"><code><span class="type">gint</span> 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"><span class="returnvalue">gint</span> 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"><span class="returnvalue">gint</span> 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><span class="type">gint</span> index_</code></em>, <em class="parameter"><code><span class="type">GError</span> **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 <span class="type">GError</span> 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 <span class="returnvalue">gint</span> * 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><span class="type">gint</span> *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-<code class="literal">NULL</code> 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 <code class="literal">NULL</code>. 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 <code class="literal">NULL</code>. </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 may be passed instead of a pointer to a location."><span class="acronym">optional</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"><span class="returnvalue">gint</span> * 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><span class="type">gint</span> *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 <code class="function">g_free()</code>. 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-<code class="literal">NULL</code> 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 <code class="literal">NULL</code>. 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 <code class="literal">NULL</code>. </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 may be passed instead of a pointer to a location."><span class="acronym">optional</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"><span class="returnvalue">gint</span> 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><span class="type">gint</span> fd</code></em>, <em class="parameter"><code><span class="type">GError</span> **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 <span class="type">GError</span> 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> <div class="footer"> <hr>Generated by GTK-Doc V1.32</div> </body> </html>