I didn't know where to begin, so I pretty much rewrote them X_X It was basically overly complex. If you wonder why I made a certain change, feel free to ask.

I did find it odd that "12" is hardcoded in the server (as opposed to being looked up by $process_name, or specified by the client), but "cs2" isn't.

server.pl

#!/usr/bin/perl

# die commands probably need to be replaced with something else.

use strict;
use warnings;

use IO::Socket;

my $EOL = "\015\012";

my $listen_sock = new IO::Socket::INET (
   LocalAddr => '127.0.0.1',  ###
   LocalPort => '8888',
   Proto     => 'tcp',
   Listen    => 1,
   Reuse     => 1,
) or die("Could not create socket: $!\n");

my $client_sock = $listen_sock->accept()
or die("Error accecpting connnection: $!\n");

{
   local $/ = $EOL;
   my $incoming;
   while (defined($incoming = <$client_sock>)) {
      chomp($incoming);

      die("Received nothing.\n") unless length $incoming;

      my $command;
      ($command, $incoming) = split /\s+/, $incoming, 2;

      if ($command eq "check") {
         my $process_name = $incoming;
         die("check: Bad process name.\n") unless $process_name =~ /^\
+w+$/;
#         my $num_processes = grep { /$process/ } `ps -ef`;
         my $num_processes = int(rand()*24);  ###
         print $client_sock ($num_processes >= 12 ? "up" : "down"), $E
+OL;
         next;
      }

      die("Bad command $command.\n");
   }
}

close($client_sock);
close($listen_sock);
[download]

client.pl

#!/usr/bin/perl

use strict;
use warnings;

use IO::Socket;

my $EOL = "\015\012";

my $mpts;

### Until I get cgi working.
open OUT, "> testpage.html"
or die("Unable to open output file: $!\n");
select(OUT);

if (0) ###
{
   local *HEADER;
   open HEADER, "< 1.html"
   or die("Unable to open header file: $!\n");
   print while (<HEADER>);
   close HEADER;
}

my $sock = new IO::Socket::INET(
#   PeerAddr => '53.230.116.97',
   PeerAddr => '127.0.0.1',  ###
   PeerPort => '8888',
   Proto    => 'tcp',
) or die("Error creating connnection: $!\n");

for (1..20) {
   my $command = "check cs2";
   print $sock $command, $EOL;

   local $/ = $EOL;
   my $reply = <$sock>;
   die("Lost connection to server.\n") unless defined $reply;
   chomp($reply);

   if ($reply eq "up") {
      print STDERR "up\n";
      print "<img src=\"./cs2up.gif\">\n";
      $mpts++;
   } elsif ($reply eq "down") {
      print STDERR "down\n";
      print "<img src=\"./cs2down.gif\">\n";
   } else {
      die("Bad reply $reply\n");
   }

   sleep(1);
}

close($sock);
close(OUT);
[download]

Okay, this definitely works. Thanks for the fix. Now I need to understand a few things.
In server.pl:
why do you have LocalPort => '127.0.0.1',  ###? Shouldn't that be LocalAddress?
why while (defined($incoming = <$client_sock>)) { instead of while ($incoming = <$client_sock>){?
In client.pl:
I don't understand the use of if (0). Is that just to disable that section of code? That is the only thing I can think of...

Again, thanks for the help!

--


Believe nothing, no matter where you read it, or who said it - even if I have said it - unless it agrees with your own reason and your own common sense.
(Buddha)