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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>GUnixFDMessage: 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="GUnixFDList.html" title="GUnixFDList"> <link rel="next" href="GCredentials.html" title="GCredentials"> <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="#GUnixFDMessage.description" class="shortcut">Description</a></span><span id="nav_hierarchy"> <span class="dim">|</span> <a href="#GUnixFDMessage.object-hierarchy" class="shortcut">Object Hierarchy</a></span><span id="nav_properties"> <span class="dim">|</span> <a href="#GUnixFDMessage.properties" class="shortcut">Properties</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="GUnixFDList.html"><img src="left.png" width="16" height="16" border="0" alt="Prev"></a></td> <td><a accesskey="n" href="GCredentials.html"><img src="right.png" width="16" height="16" border="0" alt="Next"></a></td> </tr></table> <div class="refentry"> <a name="GUnixFDMessage"></a><div class="titlepage"></div> <div class="refnamediv"><table width="100%"><tr> <td valign="top"> <h2><span class="refentrytitle"><a name="GUnixFDMessage.top_of_page"></a>GUnixFDMessage</span></h2> <p>GUnixFDMessage — A GSocketControlMessage containing a GUnixFDList</p> </td> <td class="gallery_image" valign="top" align="right"></td> </tr></table></div> <div class="refsect1"> <a name="GUnixFDMessage.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="GSocketControlMessage.html" title="GSocketControlMessage"><span class="returnvalue">GSocketControlMessage</span></a> * </td> <td class="function_name"> <a class="link" href="GUnixFDMessage.html#g-unix-fd-message-new-with-fd-list" title="g_unix_fd_message_new_with_fd_list ()">g_unix_fd_message_new_with_fd_list</a> <span class="c_punctuation">()</span> </td> </tr> <tr> <td class="function_type"> <a class="link" href="GSocketControlMessage.html" title="GSocketControlMessage"><span class="returnvalue">GSocketControlMessage</span></a> * </td> <td class="function_name"> <a class="link" href="GUnixFDMessage.html#g-unix-fd-message-new" title="g_unix_fd_message_new ()">g_unix_fd_message_new</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="GUnixFDMessage.html#g-unix-fd-message-get-fd-list" title="g_unix_fd_message_get_fd_list ()">g_unix_fd_message_get_fd_list</a> <span class="c_punctuation">()</span> </td> </tr> <tr> <td class="function_type"> <span class="returnvalue">gboolean</span> </td> <td class="function_name"> <a class="link" href="GUnixFDMessage.html#g-unix-fd-message-append-fd" title="g_unix_fd_message_append_fd ()">g_unix_fd_message_append_fd</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="GUnixFDMessage.html#g-unix-fd-message-steal-fds" title="g_unix_fd_message_steal_fds ()">g_unix_fd_message_steal_fds</a> <span class="c_punctuation">()</span> </td> </tr> </tbody> </table></div> </div> <div class="refsect1"> <a name="GUnixFDMessage.properties"></a><h2>Properties</h2> <div class="informaltable"><table class="informaltable" border="0"> <colgroup> <col width="150px" class="properties_type"> <col width="300px" class="properties_name"> <col width="200px" class="properties_flags"> </colgroup> <tbody><tr> <td class="property_type"> <a class="link" href="GUnixFDList.html" title="GUnixFDList"><span class="type">GUnixFDList</span></a> *</td> <td class="property_name"><a class="link" href="GUnixFDMessage.html#GUnixFDMessage--fd-list" title="The “fd-list” property">fd-list</a></td> <td class="property_flags">Read / Write / Construct Only</td> </tr></tbody> </table></div> </div> <div class="refsect1"> <a name="GUnixFDMessage.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">struct</td> <td class="function_name"><a class="link" href="GUnixFDMessage.html#GUnixFDMessage-struct" title="struct GUnixFDMessage">GUnixFDMessage</a></td> </tr></tbody> </table></div> </div> <div class="refsect1"> <a name="GUnixFDMessage.object-hierarchy"></a><h2>Object Hierarchy</h2> <pre class="screen"> GObject <span class="lineart">╰──</span> <a class="link" href="GSocketControlMessage.html" title="GSocketControlMessage">GSocketControlMessage</a> <span class="lineart">╰──</span> GUnixFDMessage </pre> </div> <div class="refsect1"> <a name="GUnixFDMessage.includes"></a><h2>Includes</h2> <pre class="synopsis">#include <gio/gunixfdmessage.h> </pre> </div> <div class="refsect1"> <a name="GUnixFDMessage.description"></a><h2>Description</h2> <p>This <a class="link" href="GSocketControlMessage.html" title="GSocketControlMessage"><span class="type">GSocketControlMessage</span></a> contains a <a class="link" href="GUnixFDList.html" title="GUnixFDList"><span class="type">GUnixFDList</span></a>. It may be sent 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> over UNIX sockets (ie: sockets in the <a class="link" href="GSocketAddress.html#G-SOCKET-FAMILY-UNIX:CAPS"><code class="literal">G_SOCKET_FAMILY_UNIX</code></a> family). The file descriptors are copied between processes by the kernel.</p> <p>For an easier way to send and receive file descriptors over stream-oriented UNIX sockets, see <a class="link" href="GUnixConnection.html#g-unix-connection-send-fd" title="g_unix_connection_send_fd ()"><code class="function">g_unix_connection_send_fd()</code></a> and <a class="link" href="GUnixConnection.html#g-unix-connection-receive-fd" title="g_unix_connection_receive_fd ()"><code class="function">g_unix_connection_receive_fd()</code></a>.</p> <p>Note that <code class="literal"><gio/gunixfdmessage.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="GUnixFDMessage.functions_details"></a><h2>Functions</h2> <div class="refsect2"> <a name="g-unix-fd-message-new-with-fd-list"></a><h3>g_unix_fd_message_new_with_fd_list ()</h3> <pre class="programlisting"><a class="link" href="GSocketControlMessage.html" title="GSocketControlMessage"><span class="returnvalue">GSocketControlMessage</span></a> * g_unix_fd_message_new_with_fd_list (<em class="parameter"><code><a class="link" href="GUnixFDList.html" title="GUnixFDList"><span class="type">GUnixFDList</span></a> *fd_list</code></em>);</pre> <p>Creates a new <a class="link" href="GUnixFDMessage.html" title="GUnixFDMessage"><span class="type">GUnixFDMessage</span></a> containing <em class="parameter"><code>list</code></em> .</p> <div class="refsect3"> <a name="g-unix-fd-message-new-with-fd-list.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>fd_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-message-new-with-fd-list.returns"></a><h4>Returns</h4> <p> a new <a class="link" href="GUnixFDMessage.html" title="GUnixFDMessage"><span class="type">GUnixFDMessage</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-message-new"></a><h3>g_unix_fd_message_new ()</h3> <pre class="programlisting"><a class="link" href="GSocketControlMessage.html" title="GSocketControlMessage"><span class="returnvalue">GSocketControlMessage</span></a> * g_unix_fd_message_new (<em class="parameter"><code><span class="type">void</span></code></em>);</pre> <p>Creates a new <a class="link" href="GUnixFDMessage.html" title="GUnixFDMessage"><span class="type">GUnixFDMessage</span></a> containing an empty file descriptor list.</p> <div class="refsect3"> <a name="g-unix-fd-message-new.returns"></a><h4>Returns</h4> <p> a new <a class="link" href="GUnixFDMessage.html" title="GUnixFDMessage"><span class="type">GUnixFDMessage</span></a></p> </div> <p class="since">Since: <a class="link" href="api-index-2-22.html#api-index-2.22">2.22</a></p> </div> <hr> <div class="refsect2"> <a name="g-unix-fd-message-get-fd-list"></a><h3>g_unix_fd_message_get_fd_list ()</h3> <pre class="programlisting"><a class="link" href="GUnixFDList.html" title="GUnixFDList"><span class="returnvalue">GUnixFDList</span></a> * g_unix_fd_message_get_fd_list (<em class="parameter"><code><a class="link" href="GUnixFDMessage.html" title="GUnixFDMessage"><span class="type">GUnixFDMessage</span></a> *message</code></em>);</pre> <p>Gets the <a class="link" href="GUnixFDList.html" title="GUnixFDList"><span class="type">GUnixFDList</span></a> contained in <em class="parameter"><code>message</code></em> . This function does not return a reference to the caller, but the returned list is valid for the lifetime of <em class="parameter"><code>message</code></em> .</p> <div class="refsect3"> <a name="g-unix-fd-message-get-fd-list.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>message</p></td> <td class="parameter_description"><p>a <a class="link" href="GUnixFDMessage.html" title="GUnixFDMessage"><span class="type">GUnixFDMessage</span></a></p></td> <td class="parameter_annotations"> </td> </tr></tbody> </table></div> </div> <div class="refsect3"> <a name="g-unix-fd-message-get-fd-list.returns"></a><h4>Returns</h4> <p>the <a class="link" href="GUnixFDList.html" title="GUnixFDList"><span class="type">GUnixFDList</span></a> from <em class="parameter"><code>message</code></em> . </p> <p><span class="annotation">[<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-message-append-fd"></a><h3>g_unix_fd_message_append_fd ()</h3> <pre class="programlisting"><span class="returnvalue">gboolean</span> g_unix_fd_message_append_fd (<em class="parameter"><code><a class="link" href="GUnixFDMessage.html" title="GUnixFDMessage"><span class="type">GUnixFDMessage</span></a> *message</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>message</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>message</code></em> will be closed when <em class="parameter"><code>message</code></em> is finalized.</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-message-append-fd.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>message</p></td> <td class="parameter_description"><p>a <a class="link" href="GUnixFDMessage.html" title="GUnixFDMessage"><span class="type">GUnixFDMessage</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-message-append-fd.returns"></a><h4>Returns</h4> <p> <code class="literal">TRUE</code> in case of success, else <code class="literal">FALSE</code> (and <em class="parameter"><code>error</code></em> is set)</p> </div> <p class="since">Since: <a class="link" href="api-index-2-22.html#api-index-2.22">2.22</a></p> </div> <hr> <div class="refsect2"> <a name="g-unix-fd-message-steal-fds"></a><h3>g_unix_fd_message_steal_fds ()</h3> <pre class="programlisting"><span class="returnvalue">gint</span> * g_unix_fd_message_steal_fds (<em class="parameter"><code><a class="link" href="GUnixFDMessage.html" title="GUnixFDMessage"><span class="type">GUnixFDMessage</span></a> *message</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>message</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.</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>message</code></em> , an empty array is returned.</p> <div class="refsect3"> <a name="g-unix-fd-message-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>message</p></td> <td class="parameter_description"><p>a <a class="link" href="GUnixFDMessage.html" title="GUnixFDMessage"><span class="type">GUnixFDMessage</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-message-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-2-22.html#api-index-2.22">2.22</a></p> </div> </div> <div class="refsect1"> <a name="GUnixFDMessage.other_details"></a><h2>Types and Values</h2> <div class="refsect2"> <a name="GUnixFDMessage-struct"></a><h3>struct GUnixFDMessage</h3> <pre class="programlisting">struct GUnixFDMessage;</pre> <p><a class="link" href="GUnixFDMessage.html" title="GUnixFDMessage"><span class="type">GUnixFDMessage</span></a> is an opaque data structure and can only be accessed using the following functions.</p> </div> </div> <div class="refsect1"> <a name="GUnixFDMessage.property-details"></a><h2>Property Details</h2> <div class="refsect2"> <a name="GUnixFDMessage--fd-list"></a><h3>The <code class="literal">“fd-list”</code> property</h3> <pre class="programlisting"> “fd-list” <a class="link" href="GUnixFDList.html" title="GUnixFDList"><span class="type">GUnixFDList</span></a> *</pre> <p>The GUnixFDList object to send with the message.</p> <p>Owner: GUnixFDMessage</p> <p>Flags: Read / Write / Construct Only</p> </div> </div> <div class="refsect1"> <a name="GUnixFDMessage.see-also"></a><h2>See Also</h2> <p><a class="link" href="GUnixConnection.html" title="GUnixConnection"><span class="type">GUnixConnection</span></a>, <a class="link" href="GUnixFDList.html" title="GUnixFDList"><span class="type">GUnixFDList</span></a>, <a class="link" href="GSocketControlMessage.html" title="GSocketControlMessage"><span class="type">GSocketControlMessage</span></a></p> </div> </div> <div class="footer"> <hr>Generated by GTK-Doc V1.32</div> </body> </html>