Re: g_spawn_async blocking issue

[Owen Taylor <otaylor redhat com>]

<pin doomed org> writes:

> Well, I was just wondering about g_spawn_with_pipes..  I use it to execute
> an external program for me..  Under FreeBSD (at least) when it is run at
> the same time i got sound playing with a thread through ESD.. the
> g_spawn.. seems to block the main process.
> 
>    The only solution I found to make it stop blocking was with some code
> similar to the following:
> 
> if (fork() == 0) {
>     register int cnt;
> 
>     /* close all the fds in the child to prevent it from hogging thea udio
> device */
>     for (cnt = 3; cnt < 255; cnt++)
>          close(cnt);
> 
>     exec...
>     _exit(0);
> }
> 
> and well, now it does not block.  I was just wondering if there is some
> similar code in the gspawn part in the glib, but I have not checked
> myself.  I think there should be something like this, since this forked
> child should not need those fds anyway..

It does it unless you specify otherwise. (Using the CLOEXEC flag
for fcntl, rather than close())

  http://developer.gnome.org/doc/API/2.2/glib/glib-Spawning-Processes.html#GSpawnFlags

You generally want to ask questions about programming with Glib
on gtk-app-devel-list rather than here .. this list is about
the development of GLib and GTK+.

Regards,
                                        Owen