Re: Switching between foreground and background

[Silambu Chelvan <silambu_mdu@yahoo.com>]

Yes, You have understood what I want. Forcing the
program to run in background is not a problem. I need
to get the program back in foreground.

Do you have any idea?

with regards,
M. SilambuChelvan

--- "John T. Williams" <jowillia@vt.edu> wrote:
> I think part of the problem here might be
> conceptual.
> 
> If I understand what you want, you'd like, on a
> signal, for your program to
> go into the background (still running but no longer
> blocking the terminal
> input/output). On another signal you would like the
> program to come back to
> the foreground.
> 
> If this is the case, the problem you're facing is
> that the program being in
> the foreground and the background is actually part
> of the shell, not a
> property of the program running.  Most Shells
> provide a way to switch
> programs from the foreground to the background and
> back.
> BASH for example I could type
> 
> $>./myprogram
> (cntr + Z) //suspends the current program and prings
> the prompt back
> $>bg  (runs the program in the background)
> 
> The only way that I know of to force a program to
> run in the background in
> the code is to make it a daemon which is done by
> forking twice
> 
> int main(  ) {
>    if(fork()==0)  {
>             if( fork() == 0 )  {
>                     program code starts here
>              }
>             exit(0);
>     }
>     exit(0);
> }
> 
> 
> ----- Original Message ----- 
> From: "Silambu Chelvan" <silambu_mdu@yahoo.com>
> To: <linux-newbie@vger.kernel.org>
> Sent: Monday, September 22, 2003 6:48 AM
> Subject: Switching between foreground and background
> 
> 
> > 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?
> >
> > with regards,
> > M. SilambuChelvan
> >
> >
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