use strict;
use warnings;

my @nums;
my @pids;
my $max      = 4;
my $children = 0;


foreach my $i ( 0 .. 10 ) {
# for all IP's now just 0 to 10
    pipe( READER, WRITE );
    my $pid;

    if ( $children == $max ) {
        $pid = wait();
        $children--;
    }

    if ( defined( $pid = fork() ) ) {
        if ($pid) {
            $children++;
            print "Parent: forked child ($pid)\n";
            push @pids, $pid;
            close(WRITE);
            my $num = <READER>;
            push @nums, ($num);
            close(READER);
            wait;
        }
        else {
            my $calc = 365 * $i; # just a example
# on this place i will call the function, and capture the
# return message
            print WRITE $calc;
            close(WRITE);
            exit;
        }
    }
    else {
        print "Error: failed to fork\n";
        exit;
    }
}

for my $pid (@pids) {
    waitpid $pid, 0;
}

print "Numbers: @nums \n";
# on this place i will check the array of the return values