Re: Switching between foreground and background

[Silambu Chelvan <silambu_mdu@yahoo.com>]

Hi,

Thanks for your information. 

The method you suggested works fine but I still have a
requirement. The control is still in the process and
could not see the command prompt. The thing is that I
should get the command prompt whenever the process is
put into background so that I can issue some other
command on the prompt.

Any clues??

with regards,
M. SilambuChelvan

--- Markus Klotzbuecher
<markus.klotzbuecher@creamnet.de> wrote:
> On Monday 22 September 2003 12:48 pm, Silambu
> Chelvan wrote:
> > Hi all,
> >
> > I have written some program with signal handler.
> Is
> > this possible, if
> > one of the signals registered with my program is
> > raised, my program
> > should goto background and should come to
> foreground
> > when some other of the
> > registered signal is raised. how to do it?
> >
> > Any function available to switch a process between
> > foreground and
> > background at runtime?
> 
> Hi 
> 
> Switching a task between forground and background is
> nothing else as 
> suspending and restarting. What i would try to do
> is, when you get the signal 
> you want to suspend on, call the pause() function
> (see pause(2) ). When you 
> get the signal you want to restart on, just do
> nothing as this will let the 
> pause() function return and continue doing what
> happend before suspend.
> 
> Try something like this:
> 
> ***************************************
> #include <signal.h>
> #include <stdio.h>
> 
> void suspend()
> {
>         printf("Suspending...\n");
>         pause();
> }
> 
> void wake()
> {
>         printf("Woken up.\n");
> }
> 
> int main()
> {
> 
>         signal(SIGUSR1, suspend);
>         signal(SIGUSR2, wake);
> 
>         while(1) {
>                 /* do whatever */
>                 printf("doing whatever...\n");
>                 sleep(1);
>         }
> }
> 
> Cheers
> 
>         Markus
> -
> To unsubscribe from this list: send the line
> "unsubscribe linux-newbie" in
> the body of a message to majordomo@vger.kernel.org
> More majordomo info at 
> http://vger.kernel.org/majordomo-info.html
> Please read the FAQ at
http://www.linux-learn.org/faqs


__________________________________
Do you Yahoo!?
Yahoo! SiteBuilder - Free, easy-to-use web site design software
http://sitebuilder.yahoo.com
-
To unsubscribe from this list: send the line "unsubscribe linux-newbie" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.linux-learn.org/faqs