You havn't shown code, but it is likely you need a localized SIG handler in your children.
#!/usr/bin/perl
$SIG{INT} = sub { print "Caught zap in $$\n"; exit };
if ( my $pid = fork() ) {
print "Parent Start\n";
sleep 5;
local $SIG{INT} = sub { print "Parent $$ ignoring zap\n" };
kill 2 => $pid, $$;
sleep 10;
print "Parent exit!\n";
}
else {
print "Child start\n";
sleep 10;
print "Child exit!\n";
}
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