CODEWITHSUNDEEP
bashsignals
cifz
cifz

Reputation: 1078

Launch an executable and send signal to it whilst running

I need a script that runs 'A' and send to it a signal that should terminate it, and I need to iterate that with different signals so what I want basically is 

Launch A ->
send signal S to terminate A and check stuff ->
Relaunch A ->
send signal S1 ......

My problem is that in A I've a loop like:

while(1){
    scanf()
    ...DO STUFF...
}

So using a script like 

./A arguments
kill -s QUIT A'sPid

won't work, because obviously it will not reach the kill line until A's over, and it won't without a signal or user input.

Can you give me any hint? Thanks, and sorry if it's a banal question, but I've just started learning this stuff.

Upvotes: 0

Views: 210

Answers (2)

jsj
jsj

Reputation: 9381

SIGNAL=yourSignal
while [ condition ] ; do
   ./a.out &
   PID=$!
   kill -s $SIGNAL $PID
done

Upvotes: 2

martin clayton
martin clayton

Reputation: 78105

You need to put the A instance into the background (see this), so that as it runs you can do something else, namely, send it a signal using kill.

To background a process put an & at the end, i.e.:

./A arguments &

Once the background process is started the script will move on to the next command.

Upvotes: 2

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