Symbian3/SDK/Source/GUID-817C43E8-9169-4750-818B-B431D138D71A.dita
author Dominic Pinkman <Dominic.Pinkman@Nokia.com>
Thu, 21 Jan 2010 18:18:20 +0000
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<?xml version="1.0" encoding="utf-8"?>
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<!-- Copyright (c) 2007-2010 Nokia Corporation and/or its subsidiary(-ies) All rights reserved. -->
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<!-- This component and the accompanying materials are made available under the terms of the License 
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"Eclipse Public License v1.0" which accompanies this distribution, 
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and is available at the URL "http://www.eclipse.org/legal/epl-v10.html". -->
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<!-- Initial Contributors:
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    Nokia Corporation - initial contribution.
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Contributors: 
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-->
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<!DOCTYPE concept
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  PUBLIC "-//OASIS//DTD DITA Concept//EN" "concept.dtd">
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<concept id="GUID-817C43E8-9169-4750-818B-B431D138D71A" xml:lang="en"><title>Using <codeph>GIOChannel</codeph></title><shortdesc>GIOChannel provides a portable method for using file descriptors,
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sockets and pipes and integrating them into the GLib main loop.</shortdesc><prolog><metadata><keywords/></metadata></prolog><conbody>
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<p>The <codeph>g_io_channel_unix_new()</codeph> API takes a file descriptor
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as an input parameter and is used to create a new <codeph>GIOChannel</codeph>.
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Alternatively, the <codeph>g_io_channel_new_file()</codeph> API can be used
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to create a channel for a file. Once the channel is created, it can be used
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in a generic manner.</p>
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<p>To read a channel, APIs such as the following can be used: </p>
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<ul>
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<li><p><codeph>g_io_channel_read_chars()</codeph></p></li>
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<li><p><codeph>g_io_channel_read_line()</codeph></p></li>
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<li><p><codeph>g_io_channel_read_to_end()</codeph></p></li>
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</ul>
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<p>To write to a channel an API like <codeph>g_io_channel_write_chars()</codeph> is
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used.</p>
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<p>To set the position in the current <codeph>GIOChannel</codeph>, <codeph>g_io_channel_seek_position()</codeph> can
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be used.</p>
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<p>Finally the channel can be closed using <codeph>g_io_channel_shutdown()</codeph>.</p>
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<p>The following is an example code where a file descriptor to a plain file
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is used to create a <codeph>GIOChannel</codeph>, and then the contents of
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the file are read in chunks of 100 bytes and printed using <codeph>g_print</codeph>.
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Finally the channel is closed. </p>
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<codeblock xml:space="preserve">#include &lt;glib.h&gt;
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#include &lt;stdio.h&gt;
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int main(int argc, char *argv[])
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{
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	GIOChannel *channel;
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	gchar buf[100];
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	gsize bytes_read;
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	FILE *fp;
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	if(argc != 2)
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	{
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		g_print("usage:cat &lt;file_name&gt;\n");
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		g_print("Press any key to exit\n");
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		getchar();
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		return 1;
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	}
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	fp = fopen(argv[1],"r");
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	if(!fp)
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	{
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		g_print("Unable to open the file %s\n",argv[1]);
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		return 1;
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	}
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	channel = g_io_channel_unix_new(fileno(fp));
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 	do
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 	{
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		g_io_channel_read_chars(channel,buf,100,&amp;bytes_read,NULL);
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		g_print("%s",buf);
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	}
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	while(bytes_read &gt; 0);
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	g_io_channel_shutdown(channel,TRUE,NULL);
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	fclose(fp);
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	return 0;
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}
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    76
 </codeblock>
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<p>In the example below, a sample code to copy a file is written. In the code,
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channels are opened using <codeph>g_io_channel_new_file()</codeph>. The contents
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of the file are read using <codeph>g_io_channel_read_chars()</codeph>, and
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the contents are written to a new file using <codeph>g_io_channel_write_chars()</codeph>.</p>
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<codeblock xml:space="preserve">#include &lt;glib.h&gt;
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#include &lt;stdio.h&gt;
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    84
int main(int argc, char *argv[])
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    85
{
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	GIOChannel *in_channel,*out_channel;
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    87
	gchar buf[100];
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	gsize bytes_read,bytes_written;
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    89
	GError *error = NULL;
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    90
	
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    91
	if(argc != 3)
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	{
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		g_print("usage:&lt;cp SOURCE&gt; &lt;DESTINATION&gt;\n");
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		g_print("Press any key to exit\n");
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    95
		getchar();
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		return 1;
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    97
	}
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    98
		
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	in_channel = g_io_channel_new_file(argv[1],"r",&amp;error);
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   101
	if(!in_channel)
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	{
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		g_print("Unable to open the file %s to read\n",argv[1]);
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		g_print("Press any key to exit\n");
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   105
		getchar();
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		return 1;
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	}
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   109
	out_channel = g_io_channel_new_file(argv[2],"w",&amp;error);
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   111
	if(!out_channel)
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	{
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		g_print("Unable to open the file %s to write\n",argv[2]);
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		g_print("Press any key to exit\n");
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   115
		getchar();
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		return 1;
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	}
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	do
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	{
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		g_io_channel_read_chars(in_channel,buf,100,&amp;bytes_read,&amp;error);
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   122
		if(error)
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		{
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			g_print("Error while reading file %s\n",argv[1]);
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   125
			g_print("Press any key to exit\n");
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   126
			getchar();
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			return 1;
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		}
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   129
		
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		g_io_channel_write_chars(out_channel,buf,bytes_read,&amp;bytes_written,&amp;error);
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   131
		if(error)
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		{
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			g_print("Error while writing file %s\n",argv[2]);
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   134
			g_print("Press any key to exit\n");
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   135
			getchar();
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   136
			return 1;
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   137
		}
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   138
	}
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   139
	while(bytes_read &gt; 0);
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   140
	
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   141
       g_io_channel_shutdown(in_channel,TRUE,&amp;error);
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   142
	if(error)
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   143
	{
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   144
		g_print("Error has occured\n");
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   145
		g_print("Press any key to exit\n");
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   146
		getchar();
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   147
		return 1;
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   148
	}
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   149
	 
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   150
	g_io_channel_shutdown(out_channel,TRUE,&amp;error);
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   151
 	if(error)
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	{
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   153
		g_print("Error has occured\n");
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		g_print("Press any key to exit\n");
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		getchar();
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		return 1;
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	}
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	g_print("File copied successfully...\n");
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	getchar();
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	return 0;
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}</codeblock>
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<section id="GUID-96EC4949-D5B6-41A1-A55E-D02390E5CFD5">       <title>Using <codeph>GIOChannel</codeph> in
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GLib main loops</title>       <p><codeph>GIOChannel</codeph> provides a way
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to integrate file descriptors to main loops. The following code demonstrates
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the usage. In the code, a pipe is created. A thread is created which writes
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to the write end of the pipe. The main loop checks if the other end of the
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pipe is ready to read. If it is, then the callback function is called. The
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callback calls <codeph>g_main_loop_quit()</codeph>, and the main loop is terminated
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and <codeph>g_main_loop_run()</codeph> returns. </p><codeblock xml:space="preserve">#include &lt;glib.h&gt;
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#include &lt;stdio.h&gt;
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int fd[2];
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void *thread_function(void *data)
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{
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	// call sleep so that the main loop source is not ready immediately
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	sleep(10);
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	write(fd[1],"GIOChannel main loop example",29);
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	return NULL;
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}
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gboolean my_callback(GIOChannel *source,GIOCondition condition,gpointer data)
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{
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	char buf[100];	
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	read(fd[0],buf,sizeof(buf));
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	g_print("%s",buf);
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	getchar();
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	g_main_loop_quit((GMainLoop *)data);
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	return FALSE;
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}
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int main()
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{
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	GMainLoop *loop;
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	GIOChannel *channel;
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	pipe(fd);
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	channel = g_io_channel_unix_new(fd[0]);
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	g_thread_init(NULL);
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	g_thread_create(thread_function,NULL,TRUE,NULL);
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	loop = g_main_loop_new(NULL,FALSE);
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	g_io_add_watch(channel,G_IO_IN | G_IO_HUP | G_IO_ERR,(GIOFunc)my_callback,loop);
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	g_main_loop_run(loop);
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	g_io_channel_shutdown(channel,TRUE,NULL);
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	return 0;
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}
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</codeblock></section>
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</conbody></concept>