Which signal should I send to a background process to move it foreground? SIGTTIN, SIGTOU or...?
gurudoglu. I think your request s response is here :
It s not signals which directly control whether jobs are foreground or background. The jobs are under the control of a shell (usually).
For example, under bash, if you execute:
pax> sleep 3600 &
pax> jobs
you will see output like:
[1]+ Running sleep 3600 &
Then, you can bring that job back into the foreground by using:
pax> fg %1
sleep 3600
(and the terminal waits).
Using CTRLZ does send a signal to the process (SIGSTOP) as well as putting it into the background but the only signal that can change that is SIGCONT (to continue):
pax> fg %1
sleep 3600
^Z
[1]+ Stopped sleep 3600
pax> jobs
[1]+ Stopped sleep 3600
pax> kill -CONT %1
pax> jobs
[1]+ Running sleep 3600 &
That will instruct the process to start running again but it doesn t bring it into the foreground. For that, you need the fg command.
It s probably best to think of signals (which affect the process) and foreground/background (which affect the shell that started the process by determining whether it waits for it, amongst other things) separately.
There is no way (In any OS I know of yet) to use a signal to bring a process to the foreground.
I believe you can only bring a process to the foreground using fg
Foreground is only relevant in the context of a console, and a signal cannot tell the process what console to foreground to...
Assuming you are on Unix and started the process from a shell you could type the following
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