From mboxrd@z Thu Jan  1 00:00:00 1970
From: Silambu Chelvan <silambu_mdu@yahoo.com>
Subject: Re: Switching between foreground and background
Date: Mon, 22 Sep 2003 05:38:22 -0700 (PDT)
Sender: linux-newbie-owner@vger.kernel.org
Message-ID: <20030922123822.71099.qmail@web20003.mail.yahoo.com>
References: <200309221355.51014.markus.klotzbuecher@creamnet.de>
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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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