Re: the method about start rygel

[Jens Georg <mail jensge org>]

On Thu, Nov 01, 2012 at 03:34:54PM +0800, Soho Soho123 wrote:
> Dear Jen,
> 
> I find the issue:
> when I try to use system function to start rygel,
> then there is only 1 process from the ourput of "ps".
> the rygel process will not accept any signal, like terminate
> I can not use "kill -TERM $rygel-pid"

That is actually a bug you found there.

> 
> but if I start rygel in terminal by the command "rygel -g 5 -n br0", then
> there are 2 threads from ps output.
> then is this condition , I can use kill -TERM $rygel-pid to tell rygel stop.
> Do you have idea about the difference between 2 kind of method?

& is a special character for the shell, meaning it's bash that then does the
backgrounding. When you try tostart rygel with system("rygel -n br0&") you make
it listen on a network device called "br0&". And apparently there's an issue
that the unix signal handlers are not set up properly if there's no network
interface to listen on or something like that. I've filed this as

https://bugzilla.gnome.org/show_bug.cgi?id=687325

If you want to launch rygel as a background process, you have to either fork
and exec in the child or use DBus activation.

> 
> thanks!
> 
> Best Regards,
> Soho
> 
> 2012/11/1 Soho Soho123 <soho123 2012 gmail com>:
> > Dear Jens,
> >
> > I got the result about :
> > when I try to use system function in c code to start rygel with
> > command "rygel -g 5 -n br0 &",
> > then I will see there is ONLY ONE process from output of ps
> >
> > for example :
> > in c code , I use the system function :
> > system("rygel -g 5 -n br0&"),
> > then there is only one process when ps output
> >
> > But if I just  use the command in terminal "rygel -g 5 -n br0&"
> > then try to get process list by ps,
> > I can see there are 2 threads,
> >
> > do you have idea about  this phenomenon?
> >
> > it seems both case workable, but I am not sure whether any  side-effect?
> >
> >
> > Best Regards,
> > Soho
>