What happens when you try it? It's pretty trivial to test...

Calling script that runs another script with system() (call.pl):

use warnings;
use strict;

system 'perl', 'call.pl';
[download]

Script that gets called by the one above that we'll ^C (called.pl):

use warnings;
use strict;

my $c = 1;

while (1){
    print $c++ ."\n";
    sleep 1;
}
[download]

Run call.pl to exec called.pl:

$ perl call.pl 
1
2
3
4
5
[download]

In another terminal window, see if called.pl is running:

$ ps ax | grep called
29221 pts/9    S+     0:00 perl called.pl
[download]

Yep, it is. Back to the other terminal:

6
7
^C
[download]

Check if called.pl is still running after ^C:

$ ps ax | grep called
[download]

Nope!

The whole process chain is killed when you kill the top process, unless you explicitly set the process called by system to go into the background, whether it be a daemon, service etc.

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