my client-script:

use strict;
use IO::Socket;

my ($host,$port) = ("localhost","9000");

my $remote = IO::Socket::INET->new(
    Proto    => "udp",
    PeerAddr => $host,
     PeerPort => $port
  ) or log_die "cannot connect to $host - $port\n";
die("[Connected to $host:$port]\n");

syswrite($remote, "Yooo\n")
[download]

Server-script:

use strict;
use IO::Socket;


my $socket=IO::Socket::INET->new(LocalAddr => 'localhost',
                                 LocalPort => 9000,
                                 Proto     => 'udp')
or die "socket: $!";

my $length;
while (defined($length=sysread($socket, my $buffer, 65536)) && $length
+ != 0)
{
  die "sysread: $!" if (!defined($length));
  # When I have a connect from a client start another very big script 
+:)
  system('./sleep.pl');
  exit;
}
[download]

So as you see when there's a connect from a client, I need to start another proces.

1) client -> server -> start ./sleep

2) client -> server -> ./sleep still running -> don't wait

3) client -> server -> ./sleep still running -> don't wait

4) client -> server -> sleep not running? start ./sleep

=> for these 4 cases the server will start sleep 4 times in a row . This I don't want, I want ./sleep only to start when client connects and there is no other sleep running.

For the moment my existing codes makes sure only one ./sleep process is running at a time(thanks to spawning a child and a wait() in the parent). In case 2 and 3 there should never run a ./sleep. only when there is a new connect when there is no ./sleep running.

--
My opinions may have changed,
but not the fact that I am right

---

---

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