Re: Switching between foreground and background

Silambu Chelvan
2003-09-22T15:51:26Z

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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