RE: [gtk-list] Re: external program;Somebody else with running problems

[Low Yoke Hean <yhlow gintic gov sg>]

I got a similar error when using fork() in
a callback function.

The point here is that you need to exit the
child process explicitly using _exit(). 
 
>From the unix man page, _exit() is Async_Signal_Safe.


-malcolm 

-----Original Message-----
From: Sergiu Gavrila [mailto:sergiu@deuroconsult.ro]
Sent: Friday, February 26, 1999 5:10 PM
To: gtk-list@redhat.com
Subject: [gtk-list] Re: external program;Somebody else with running
problems


I try to run a program from a Gtk1.0.2 application (using fork, exec,...)
when
I press a button, but I am doing something wrong because I get an error
(Xlib
asynchronous replay, then core dump). I don't think is something with the
Gtk
(maybe with my lack of X programing knowledge), but if someone has a
solution,
please help. The function I am using to launch a program is bellow:

void launch(char *line)
{
 pid_t pid;

 switch (pid=vfork()){
  case -1:
    g_print("Fork error!");
    break;
  case 0:
           execl(line,line,NULL);
           exit(0);
           break;
  default:
    g_print("GrandPa");
 }
}


Havoc Pennington wrote:

> On Fri, 26 Feb 1999, Low Yoke Hean wrote:
> >
> >       static void run(GtkWidget *widget, gpointer data){
> >
> >         pop a modal dialog box
> >         execute an external program
>
> I assume you're waiting for the external program to finish running?
> If you do that, there's no way for Gtk to run, so it can't update the
> display.
>
> If you don't care about the output of the external program, just fork(),
> exec(), and forget it. (Gnome has some convenience functions to do this if
> you use Gnome.)
>
> If you do care about the output and you're reading it via pipes or
> something, use gtk_input_add() to install a handler function to
> be called whenever there is data on the pipe. Or alternatively, install a
> timeout function and periodically read from the pipe.
>
> Havoc
>
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