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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>GPollableInputStream: 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="streaming.html" title="Streaming I/O"> <link rel="prev" href="GConverterOutputStream.html" title="GConverterOutputStream"> <link rel="next" href="GPollableOutputStream.html" title="GPollableOutputStream"> <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="#GPollableInputStream.description" class="shortcut">Description</a></span><span id="nav_hierarchy"> <span class="dim">|</span> <a href="#GPollableInputStream.object-hierarchy" class="shortcut">Object Hierarchy</a></span><span id="nav_prerequisites"> <span class="dim">|</span> <a href="#GPollableInputStream.prerequisites" class="shortcut">Prerequisites</a></span><span id="nav_implementations"> <span class="dim">|</span> <a href="#GPollableInputStream.implementations" class="shortcut">Known Implementations</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="streaming.html"><img src="up.png" width="16" height="16" border="0" alt="Up"></a></td> <td><a accesskey="p" href="GConverterOutputStream.html"><img src="left.png" width="16" height="16" border="0" alt="Prev"></a></td> <td><a accesskey="n" href="GPollableOutputStream.html"><img src="right.png" width="16" height="16" border="0" alt="Next"></a></td> </tr></table> <div class="refentry"> <a name="GPollableInputStream"></a><div class="titlepage"></div> <div class="refnamediv"><table width="100%"><tr> <td valign="top"> <h2><span class="refentrytitle"><a name="GPollableInputStream.top_of_page"></a>GPollableInputStream</span></h2> <p>GPollableInputStream — Interface for pollable input streams</p> </td> <td class="gallery_image" valign="top" align="right"></td> </tr></table></div> <div class="refsect1"> <a name="GPollableInputStream.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"> <span class="returnvalue">gboolean</span> </td> <td class="function_name"> <a class="link" href="GPollableInputStream.html#g-pollable-input-stream-can-poll" title="g_pollable_input_stream_can_poll ()">g_pollable_input_stream_can_poll</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="GPollableInputStream.html#g-pollable-input-stream-is-readable" title="g_pollable_input_stream_is_readable ()">g_pollable_input_stream_is_readable</a> <span class="c_punctuation">()</span> </td> </tr> <tr> <td class="function_type"> <span class="returnvalue">GSource</span> * </td> <td class="function_name"> <a class="link" href="GPollableInputStream.html#g-pollable-input-stream-create-source" title="g_pollable_input_stream_create_source ()">g_pollable_input_stream_create_source</a> <span class="c_punctuation">()</span> </td> </tr> <tr> <td class="function_type"> <span class="returnvalue">gssize</span> </td> <td class="function_name"> <a class="link" href="GPollableInputStream.html#g-pollable-input-stream-read-nonblocking" title="g_pollable_input_stream_read_nonblocking ()">g_pollable_input_stream_read_nonblocking</a> <span class="c_punctuation">()</span> </td> </tr> </tbody> </table></div> </div> <div class="refsect1"> <a name="GPollableInputStream.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="GPollableInputStream.html#GPollableInputStream-struct" title="GPollableInputStream">GPollableInputStream</a></td> </tr> <tr> <td class="datatype_keyword">struct</td> <td class="function_name"><a class="link" href="GPollableInputStream.html#GPollableInputStreamInterface" title="struct GPollableInputStreamInterface">GPollableInputStreamInterface</a></td> </tr> </tbody> </table></div> </div> <div class="refsect1"> <a name="GPollableInputStream.object-hierarchy"></a><h2>Object Hierarchy</h2> <pre class="screen"> GInterface <span class="lineart">╰──</span> GPollableInputStream </pre> </div> <div class="refsect1"> <a name="GPollableInputStream.prerequisites"></a><h2>Prerequisites</h2> <p> GPollableInputStream requires <a class="link" href="GInputStream.html" title="GInputStream">GInputStream</a>.</p> </div> <div class="refsect1"> <a name="GPollableInputStream.implementations"></a><h2>Known Implementations</h2> <p> GPollableInputStream is implemented by <a class="link" href="GConverterInputStream.html" title="GConverterInputStream">GConverterInputStream</a>, <a class="link" href="GMemoryInputStream.html" title="GMemoryInputStream">GMemoryInputStream</a> and <a class="link" href="GUnixInputStream.html" title="GUnixInputStream">GUnixInputStream</a>.</p> </div> <div class="refsect1"> <a name="GPollableInputStream.includes"></a><h2>Includes</h2> <pre class="synopsis">#include <gio/gio.h> </pre> </div> <div class="refsect1"> <a name="GPollableInputStream.description"></a><h2>Description</h2> <p><a class="link" href="GPollableInputStream.html" title="GPollableInputStream"><span class="type">GPollableInputStream</span></a> is implemented by <a href="GInputStream.html#GInputStream-struct"><span class="type">GInputStreams</span></a> that can be polled for readiness to read. This can be used when interfacing with a non-GIO API that expects UNIX-file-descriptor-style asynchronous I/O rather than GIO-style.</p> </div> <div class="refsect1"> <a name="GPollableInputStream.functions_details"></a><h2>Functions</h2> <div class="refsect2"> <a name="g-pollable-input-stream-can-poll"></a><h3>g_pollable_input_stream_can_poll ()</h3> <pre class="programlisting"><span class="returnvalue">gboolean</span> g_pollable_input_stream_can_poll (<em class="parameter"><code><a class="link" href="GPollableInputStream.html" title="GPollableInputStream"><span class="type">GPollableInputStream</span></a> *stream</code></em>);</pre> <p>Checks if <em class="parameter"><code>stream</code></em> is actually pollable. Some classes may implement <a class="link" href="GPollableInputStream.html" title="GPollableInputStream"><span class="type">GPollableInputStream</span></a> but have only certain instances of that class be pollable. If this method returns <code class="literal">FALSE</code>, then the behavior of other <a class="link" href="GPollableInputStream.html" title="GPollableInputStream"><span class="type">GPollableInputStream</span></a> methods is undefined.</p> <p>For any given stream, the value returned by this method is constant; a stream cannot switch from pollable to non-pollable or vice versa.</p> <div class="refsect3"> <a name="g-pollable-input-stream-can-poll.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>stream</p></td> <td class="parameter_description"><p>a <a class="link" href="GPollableInputStream.html" title="GPollableInputStream"><span class="type">GPollableInputStream</span></a>.</p></td> <td class="parameter_annotations"> </td> </tr></tbody> </table></div> </div> <div class="refsect3"> <a name="g-pollable-input-stream-can-poll.returns"></a><h4>Returns</h4> <p> <code class="literal">TRUE</code> if <em class="parameter"><code>stream</code></em> is pollable, <code class="literal">FALSE</code> if not.</p> </div> <p class="since">Since: <a class="link" href="api-index-2-28.html#api-index-2.28">2.28</a></p> </div> <hr> <div class="refsect2"> <a name="g-pollable-input-stream-is-readable"></a><h3>g_pollable_input_stream_is_readable ()</h3> <pre class="programlisting"><span class="returnvalue">gboolean</span> g_pollable_input_stream_is_readable (<em class="parameter"><code><a class="link" href="GPollableInputStream.html" title="GPollableInputStream"><span class="type">GPollableInputStream</span></a> *stream</code></em>);</pre> <p>Checks if <em class="parameter"><code>stream</code></em> can be read.</p> <p>Note that some stream types may not be able to implement this 100% reliably, and it is possible that a call to <a class="link" href="GInputStream.html#g-input-stream-read" title="g_input_stream_read ()"><code class="function">g_input_stream_read()</code></a> after this returns <code class="literal">TRUE</code> would still block. To guarantee non-blocking behavior, you should always use <a class="link" href="GPollableInputStream.html#g-pollable-input-stream-read-nonblocking" title="g_pollable_input_stream_read_nonblocking ()"><code class="function">g_pollable_input_stream_read_nonblocking()</code></a>, which will return a <a class="link" href="gio-GIOError.html#G-IO-ERROR-WOULD-BLOCK:CAPS"><code class="literal">G_IO_ERROR_WOULD_BLOCK</code></a> error rather than blocking.</p> <div class="refsect3"> <a name="g-pollable-input-stream-is-readable.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>stream</p></td> <td class="parameter_description"><p>a <a class="link" href="GPollableInputStream.html" title="GPollableInputStream"><span class="type">GPollableInputStream</span></a>.</p></td> <td class="parameter_annotations"> </td> </tr></tbody> </table></div> </div> <div class="refsect3"> <a name="g-pollable-input-stream-is-readable.returns"></a><h4>Returns</h4> <p> <code class="literal">TRUE</code> if <em class="parameter"><code>stream</code></em> is readable, <code class="literal">FALSE</code> if not. If an error has occurred on <em class="parameter"><code>stream</code></em> , this will result in <a class="link" href="GPollableInputStream.html#g-pollable-input-stream-is-readable" title="g_pollable_input_stream_is_readable ()"><code class="function">g_pollable_input_stream_is_readable()</code></a> returning <code class="literal">TRUE</code>, and the next attempt to read will return the error.</p> </div> <p class="since">Since: <a class="link" href="api-index-2-28.html#api-index-2.28">2.28</a></p> </div> <hr> <div class="refsect2"> <a name="g-pollable-input-stream-create-source"></a><h3>g_pollable_input_stream_create_source ()</h3> <pre class="programlisting"><span class="returnvalue">GSource</span> * g_pollable_input_stream_create_source (<em class="parameter"><code><a class="link" href="GPollableInputStream.html" title="GPollableInputStream"><span class="type">GPollableInputStream</span></a> *stream</code></em>, <em class="parameter"><code><a class="link" href="GCancellable.html" title="GCancellable"><span class="type">GCancellable</span></a> *cancellable</code></em>);</pre> <p>Creates a <span class="type">GSource</span> that triggers when <em class="parameter"><code>stream</code></em> can be read, or <em class="parameter"><code>cancellable</code></em> is triggered or an error occurs. The callback on the source is of the <a class="link" href="gio-gpollableutils.html#GPollableSourceFunc" title="GPollableSourceFunc ()"><span class="type">GPollableSourceFunc</span></a> type.</p> <p>As with <a class="link" href="GPollableInputStream.html#g-pollable-input-stream-is-readable" title="g_pollable_input_stream_is_readable ()"><code class="function">g_pollable_input_stream_is_readable()</code></a>, it is possible that the stream may not actually be readable even after the source triggers, so you should use <a class="link" href="GPollableInputStream.html#g-pollable-input-stream-read-nonblocking" title="g_pollable_input_stream_read_nonblocking ()"><code class="function">g_pollable_input_stream_read_nonblocking()</code></a> rather than <a class="link" href="GInputStream.html#g-input-stream-read" title="g_input_stream_read ()"><code class="function">g_input_stream_read()</code></a> from the callback.</p> <div class="refsect3"> <a name="g-pollable-input-stream-create-source.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>stream</p></td> <td class="parameter_description"><p>a <a class="link" href="GPollableInputStream.html" title="GPollableInputStream"><span class="type">GPollableInputStream</span></a>.</p></td> <td class="parameter_annotations"> </td> </tr> <tr> <td class="parameter_name"><p>cancellable</p></td> <td class="parameter_description"><p>a <a class="link" href="GCancellable.html" title="GCancellable"><span class="type">GCancellable</span></a>, or <code class="literal">NULL</code>. </p></td> <td class="parameter_annotations"><span class="annotation">[<acronym title="NULL may be passed as the value in, out, in-out; or as a return value."><span class="acronym">nullable</span></acronym>]</span></td> </tr> </tbody> </table></div> </div> <div class="refsect3"> <a name="g-pollable-input-stream-create-source.returns"></a><h4>Returns</h4> <p>a new <span class="type">GSource</span>. </p> <p><span class="annotation">[<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-2-28.html#api-index-2.28">2.28</a></p> </div> <hr> <div class="refsect2"> <a name="g-pollable-input-stream-read-nonblocking"></a><h3>g_pollable_input_stream_read_nonblocking ()</h3> <pre class="programlisting"><span class="returnvalue">gssize</span> g_pollable_input_stream_read_nonblocking (<em class="parameter"><code><a class="link" href="GPollableInputStream.html" title="GPollableInputStream"><span class="type">GPollableInputStream</span></a> *stream</code></em>, <em class="parameter"><code><span class="type">void</span> *buffer</code></em>, <em class="parameter"><code><span class="type">gsize</span> count</code></em>, <em class="parameter"><code><a class="link" href="GCancellable.html" title="GCancellable"><span class="type">GCancellable</span></a> *cancellable</code></em>, <em class="parameter"><code><span class="type">GError</span> **error</code></em>);</pre> <p>Attempts to read up to <em class="parameter"><code>count</code></em> bytes from <em class="parameter"><code>stream</code></em> into <em class="parameter"><code>buffer</code></em> , as with <a class="link" href="GInputStream.html#g-input-stream-read" title="g_input_stream_read ()"><code class="function">g_input_stream_read()</code></a>. If <em class="parameter"><code>stream</code></em> is not currently readable, this will immediately return <a class="link" href="gio-GIOError.html#G-IO-ERROR-WOULD-BLOCK:CAPS"><code class="literal">G_IO_ERROR_WOULD_BLOCK</code></a>, and you can use <a class="link" href="GPollableInputStream.html#g-pollable-input-stream-create-source" title="g_pollable_input_stream_create_source ()"><code class="function">g_pollable_input_stream_create_source()</code></a> to create a <span class="type">GSource</span> that will be triggered when <em class="parameter"><code>stream</code></em> is readable.</p> <p>Note that since this method never blocks, you cannot actually use <em class="parameter"><code>cancellable</code></em> to cancel it. However, it will return an error if <em class="parameter"><code>cancellable</code></em> has already been cancelled when you call, which may happen if you call this method after a source triggers due to having been cancelled.</p> <p>Virtual: read_nonblocking</p> <div class="refsect3"> <a name="g-pollable-input-stream-read-nonblocking.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>stream</p></td> <td class="parameter_description"><p>a <a class="link" href="GPollableInputStream.html" title="GPollableInputStream"><span class="type">GPollableInputStream</span></a></p></td> <td class="parameter_annotations"> </td> </tr> <tr> <td class="parameter_name"><p>buffer</p></td> <td class="parameter_description"><p>a buffer to read data into (which should be at least <em class="parameter"><code>count</code></em> bytes long). </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=count][<acronym title="Generics and defining elements of containers and arrays."><span class="acronym">element-type</span></acronym> guint8]</span></td> </tr> <tr> <td class="parameter_name"><p>count</p></td> <td class="parameter_description"><p>the number of bytes you want to read</p></td> <td class="parameter_annotations"> </td> </tr> <tr> <td class="parameter_name"><p>cancellable</p></td> <td class="parameter_description"><p>a <a class="link" href="GCancellable.html" title="GCancellable"><span class="type">GCancellable</span></a>, or <code class="literal">NULL</code>. </p></td> <td class="parameter_annotations"><span class="annotation">[<acronym title="NULL may be passed as the value in, out, in-out; or as a return value."><span class="acronym">nullable</span></acronym>]</span></td> </tr> <tr> <td class="parameter_name"><p>error</p></td> <td class="parameter_description"><p><span class="type">GError</span> for error reporting, or <code class="literal">NULL</code> to ignore.</p></td> <td class="parameter_annotations"> </td> </tr> </tbody> </table></div> </div> <div class="refsect3"> <a name="g-pollable-input-stream-read-nonblocking.returns"></a><h4>Returns</h4> <p> the number of bytes read, or -1 on error (including <a class="link" href="gio-GIOError.html#G-IO-ERROR-WOULD-BLOCK:CAPS"><code class="literal">G_IO_ERROR_WOULD_BLOCK</code></a>).</p> </div> </div> </div> <div class="refsect1"> <a name="GPollableInputStream.other_details"></a><h2>Types and Values</h2> <div class="refsect2"> <a name="GPollableInputStream-struct"></a><h3>GPollableInputStream</h3> <pre class="programlisting">typedef struct _GPollableInputStream GPollableInputStream;</pre> <p>An interface for a <a class="link" href="GInputStream.html" title="GInputStream"><span class="type">GInputStream</span></a> that can be polled for readability.</p> <p class="since">Since: <a class="link" href="api-index-2-28.html#api-index-2.28">2.28</a></p> </div> <hr> <div class="refsect2"> <a name="GPollableInputStreamInterface"></a><h3>struct GPollableInputStreamInterface</h3> <pre class="programlisting">struct GPollableInputStreamInterface { GTypeInterface g_iface; /* Virtual Table */ gboolean (*can_poll) (GPollableInputStream *stream); gboolean (*is_readable) (GPollableInputStream *stream); GSource * (*create_source) (GPollableInputStream *stream, GCancellable *cancellable); gssize (*read_nonblocking) (GPollableInputStream *stream, void *buffer, gsize count, GError **error); }; </pre> <p>The interface for pollable input streams.</p> <p>The default implementation of <em class="parameter"><code>can_poll</code></em> always returns <code class="literal">TRUE</code>.</p> <p>The default implementation of <em class="parameter"><code>read_nonblocking</code></em> calls <a class="link" href="GPollableInputStream.html#g-pollable-input-stream-is-readable" title="g_pollable_input_stream_is_readable ()"><code class="function">g_pollable_input_stream_is_readable()</code></a>, and then calls <a class="link" href="GInputStream.html#g-input-stream-read" title="g_input_stream_read ()"><code class="function">g_input_stream_read()</code></a> if it returns <code class="literal">TRUE</code>. This means you only need to override it if it is possible that your <em class="parameter"><code>is_readable</code></em> implementation may return <code class="literal">TRUE</code> when the stream is not actually readable.</p> <div class="refsect3"> <a name="GPollableInputStreamInterface.members"></a><h4>Members</h4> <div class="informaltable"><table class="informaltable" width="100%" border="0"> <colgroup> <col width="300px" class="struct_members_name"> <col class="struct_members_description"> <col width="200px" class="struct_members_annotations"> </colgroup> <tbody> <tr> <td class="struct_member_name"><p><em class="structfield"><code><a name="GPollableInputStreamInterface.can-poll"></a>can_poll</code></em> ()</p></td> <td class="struct_member_description"><p>Checks if the <a class="link" href="GPollableInputStream.html" title="GPollableInputStream"><span class="type">GPollableInputStream</span></a> instance is actually pollable</p></td> <td class="struct_member_annotations"> </td> </tr> <tr> <td class="struct_member_name"><p><em class="structfield"><code><a name="GPollableInputStreamInterface.is-readable"></a>is_readable</code></em> ()</p></td> <td class="struct_member_description"><p>Checks if the stream is readable</p></td> <td class="struct_member_annotations"> </td> </tr> <tr> <td class="struct_member_name"><p><em class="structfield"><code><a name="GPollableInputStreamInterface.create-source"></a>create_source</code></em> ()</p></td> <td class="struct_member_description"><p>Creates a <span class="type">GSource</span> to poll the stream</p></td> <td class="struct_member_annotations"> </td> </tr> <tr> <td class="struct_member_name"><p><em class="structfield"><code><a name="GPollableInputStreamInterface.read-nonblocking"></a>read_nonblocking</code></em> ()</p></td> <td class="struct_member_description"><p>Does a non-blocking read or returns <a class="link" href="gio-GIOError.html#G-IO-ERROR-WOULD-BLOCK:CAPS"><code class="literal">G_IO_ERROR_WOULD_BLOCK</code></a></p></td> <td class="struct_member_annotations"> </td> </tr> </tbody> </table></div> </div> <p class="since">Since: <a class="link" href="api-index-2-28.html#api-index-2.28">2.28</a></p> </div> </div> <div class="refsect1"> <a name="GPollableInputStream.see-also"></a><h2>See Also</h2> <p><a class="link" href="GInputStream.html" title="GInputStream"><span class="type">GInputStream</span></a>, <a class="link" href="GPollableOutputStream.html" title="GPollableOutputStream"><span class="type">GPollableOutputStream</span></a>, <a class="link" href="GFileDescriptorBased.html" title="GFileDescriptorBased"><span class="type">GFileDescriptorBased</span></a></p> </div> </div> <div class="footer"> <hr>Generated by GTK-Doc V1.32</div> </body> </html>