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How to bring an orphaned process to foreground ?

Posted on 2004-05-02
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Last Modified: 2008-02-26
Hi.

This is the situation I have.

1. Process "p0" forks (started form terminal).
2. Child "exec"s process "p1"
3. Process "p0" terminates leaving child orphaned.

Now p1 need to read keyboard input. But since it is a background process it can not.

How to solve this ?

Maybe I can bring child to foreground or regain control over terminal ?

Thank You.
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Question by:lklm
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7 Comments
 
LVL 12

Expert Comment

by:stefan73
ID: 10975489
Hi lklm,
> Now p1 need to read keyboard input. But since it is a background process
> it can not.

Maybe you can exec in p0 instead of p1?

Cheers,
Stefan
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Author Comment

by:lklm
ID: 10975993
Hi

Unfortunately I can't change the structure of application.
This is multi process application I have access to all the sources but I change change the arch.

Thanks
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LVL 7

Expert Comment

by:glassd
ID: 10976291
Not sure if this will work but:

The command "jobs" should show the backgrounded job, if it is still associated with the terminal. If it is job 1 then:
fg %1
should bring it to the foreground.

Might be worth a try.
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LVL 12

Expert Comment

by:stefan73
ID: 10976375
lklm,
Is p1 really an interactive process? Or do you want to "remote control" its I/O from p0?

Stefan
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LVL 8

Expert Comment

by:Anthony2000
ID: 10983085
I am assuming that once p0 terminates, process p1 loses its associated terminal and becomes owned by init.

Is there a reason why you cannot change the point where p0 is forked so that the parent just waits until the child is finished before exiting. Shell programs do this all the time. In your case when you return to your parent, have the parent exit then, instead of after it forks and execs to p1.

Does this make sense?

Anthony.
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