GIOChannel issues

[Travis Miller <raphtee@xxxxxxxxx>]

Hello,

I am trying to use GIOChannel in order to use sockets in a simple way (I
am trying to get notification on events like read and disconnect).
Anyway, here is the code that creates the GIOCHannel

void
on_ListenButton_clicked                (GtkButton       *button,
                                        gpointer         user_data)
{
	GtkWidget *text = lookup_widget(GTK_WIDGET(button),
"StatusText");
	
	// create the listening socket
	int sockfd, new_fd;  
    	struct sockaddr_in my_addr;    
    	struct sockaddr_in their_addr; 
    	int sin_size;

   	 if ((sockfd = socket(AF_INET, SOCK_STREAM, 0)) == -1) {
      	  perror("socket");
      	  exit(1);
    	}
	 
	my_addr.sin_family = AF_INET;        
   	my_addr.sin_port = htons(1352); 
   	my_addr.sin_addr.s_addr = INADDR_ANY; 
    	bzero(&(my_addr.sin_zero), 8);       

    	if (bind(sockfd, (struct sockaddr *)&my_addr, sizeof(struct 
			sockaddr)) == -1) {
	        perror("bind");
	        exit(1);
	}
	 
	 
	if (listen(sockfd, 5) == -1) {
        	perror("listen");
       	 	exit(1);
    	}
	gtk_entry_set_text(GTK_ENTRY(text), "Listening");
	 
	sin_size = sizeof(struct sockaddr_in);
    	if ((new_fd = accept(sockfd, (struct sockaddr *)&their_addr, 
			&sin_size)) == -1) {
	        perror("accept");
    	}
	  
	// we got a socket so set text box
	gtk_entry_set_text(GTK_ENTRY(text), "Connection accepted");
	  
	// now create GIOChannel from connection 
	GIOChannel *iochannel = g_io_channel_unix_new(new_fd);
	
	// now add to main event loop
	GtkWidget *window = lookup_widget(GTK_WIDGET(button),
						"MainWindow");
	g_io_add_watch(iochannel, G_IO_IN, (GIOFunc *) &ReceiveData, 	
						(gpointer) window);
	 
	
	
	// now close the listener
	close(sockfd);
	
}

The function g_io_watch() ties to the G_IO_IN (there is data to read on
the socket) event to the function ReceiveData that is defined as

gboolean ReceiveData(GIOChannel *source, GIOCondition condition,
gpointer data)
{
	gchar buf[500];
	int bytes_read;
	GtkWidget *text = NULL;
	GQuark quark;
	GError *error = NULL;
	gint sd;	
	
	
	
	g_print("data received\n");
	text = lookup_widget(GTK_WIDGET(data), "StatusText");
	gtk_entry_set_text(GTK_ENTRY(text), "received data");
	
	sd = g_io_channel_unix_get_fd(source);
	
	bytes_read = recv(sd, buf, 500, 0);
	
	if(bytes_read == -1) {
		g_print("error\n");
	}
	else {
		buf[bytes_read] = '\0';
		g_print("buf = %s\n", buf);
		text = lookup_widget(GTK_WIDGET(data), "ReceivedText");
		gtk_entry_set_text(GTK_ENTRY(text), buf);
	}
	
	return TRUE;
}

The problem is this.  If the client closes the connection then I get a
flood of empty buffers and the ReceiveData() function is repeatedly
called.  What could cause this weird behavior?


Travis Miller

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