Re: gtk in fork()ed process

[Oliver Rauch <oliver rauch rauch-domain de>]

Marcelo wrote:

> Well, if you don't at least wait4() the child process, you will let zombie process stay on your system 
> until the main program dies, when init becomes parent of the zombies and clean them for you.
> So, if you have to clean the process, you can do the error check by the return value of the child. Look:
>
> pid_t wait4(pid_t pid, int *status, int options, struct rusage *rusage)
>
> you can just call wait4 this way:
>   int ret;
>   wait4 (child_pid, &ret, 0, NULL);
> and them, to check the return value,
>   if (!WIFEXITED (ret) || WEXITSTATUS(ret)) {
>     gtk....show_dialog..iguessthisisimplementedin2.0 ("Child process failed.");
>   }

The parent process must not be stopped when the child process is running.
I now added an inter process comunication via pipe to display the error meassge
by the parent process.

I think the cleanup of the zombie can be done in the parent process by a signal
handler (sigaction(SIGCHLD)).

Bye
Oliver

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