Re: Can anyone help me with this code?

[Jan Jirmasek <jim ure cas cz>]

On Tue, 5 Sep 2000, Carlos Toledo wrote:

Hi!

  I don't understand the reason why are you doing it (the creating new 
process). If is it possible, you should avoid multithreading in a gtk
program. If you really need it, it should be enough to use threads in the
gtk program (see gtk faq).

  In this case, I think, that you should call the gtk_exit() in
the last existing process, not in the newly created process - I'd rather
finish it in regular way. (exit()). When you call gtk_exit(), it should
deallocate all the resources used by gtk, and probably also close
connections between the gtk program and X server. That is probably the
reason for 'broken pipe', when the original process then wants to display
something ...


							Jim

  

> Hello, I have a problem with this code, when I create a child process
> using gtk the program always dies with a broken pipe.
> Here is the !#"!$% code:
> 
> #include <gtk/gtk.h>
> #include <stdio.h>
> 
> 
> void sistema (GtkWidget *widget, gpointer *data)
> {
> 	int pid, index, w, estado, i=10;
> 
> 	pid = fork ();
> 
> 	switch (pid)
> 	{
> 		case 0:
> 		/* --- Codigo del hijo --- */
> 		for (index = 0; index < i ; index ++)
> 		{
> 			printf ("%d\n", index);
> 		}
> 		gtk_exit (0);
> 		break;
> 
> 		default:
> 		
> 		while ( (w = wait (&estado) ) != pid && pid != -1);
> 		printf ("Proceso padre terminado.\007\n");
> 		break;
> 	}
> 
> }
> 
> int main ( int argc, char *argv[])
> {
> 	GtkWidget *window;
> 	GtkWidget *boton;
> 
> 	gtk_init (&argc, &argv);
> 		
> 	/* --- Creamos la ventana principal --- */
> 	window = gtk_window_new (GTK_WINDOW_TOPLEVEL);
> 	gtk_container_set_border_width(GTK_CONTAINER (window), 10);
> 	gtk_window_set_title (GTK_WINDOW (window), "Prueba proceso hijo");
> 	gtk_signal_connect (GTK_OBJECT (window), "delete_event", GTK_SIGNAL_FUNC (gtk_main_quit), NULL);
> 	gtk_widget_set_usize (window, 200, 200);
> 	/* --- Creamos el boton --- */
> 	boton = gtk_button_new_with_label ("Proceso hijo");
> 	gtk_container_add (GTK_CONTAINER (window), boton);
> 	gtk_signal_connect (GTK_OBJECT (boton), "clicked", GTK_SIGNAL_FUNC (sistema), NULL);
> 	gtk_widget_show (boton);
> 	gtk_widget_show (window);
> 	gtk_main ();
> 	return 0;
> }
> 
> Can someone tell me why the program fails?
> 
> 			
> thanks in advance.
> Carlos
> 
>  
> 
> 
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