Re: Switching between foreground and background

Silambu Chelvan
2003-09-22T12:38:22Z

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
> -
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