在perl socket编程中如何从客户端发送数据并从服务器接收数据以及如何获取客户端进程数和客户端ID？

Question

如何获得连接到服务器的客户端数量？如果说我已打开4个终端并在localhost上运行client.pl 4次以进行测试，我如何在服务器脚本中获取客户端ID和客户端数量？我在VirtualBox上使用Ubuntu。我在多线程环境中。

'''

#!/usr/bin/perl
#server
use warnings;
use strict;
use IO::Socket;
use threads;
use threads::shared;
$|++;
print "$$ Server started\n";;  # do a "top -p -H $$" to monitor server threads

our @clients : shared;
@clients = ();

my $server = new IO::Socket::INET(
    Timeout   => 7200,
    Proto     => "tcp",
    LocalPort => 9000,
    Reuse     => 1,
    Listen    => 3
);
my $num_of_client = -1;

while (1) {
    my $client;

    do {
        $client = $server->accept;
    } until ( defined($client) );

    my $peerhost = $client->peerhost();
    print "accepted a client $client, $peerhost, id = ", ++$num_of_client, "\n";
    my $fileno = fileno $client;
    push (@clients, $fileno);
    #spawn a thread here for each client
    my $thr = threads->new( \&processit, $client, $fileno, $peerhost )->detach(); 
}
# end of main thread

sub processit {
     my ($lclient,$lfileno,$lpeer) = @_; #local client

     if($lclient->connected){
          # Here you can do your stuff
          # I use have the server talk to the client
          # via print $client and while(<$lclient>)
          print $lclient "$lpeer->Welcome to server\n";  

          while(<$lclient>){
             # print $lclient "$lpeer->$_\n";
              print "clients-> @clients\n";           

              foreach my $fn (@clients) { 
                  open my $fh, ">&=$fn" or warn $! and die;
                  print $fh  "$_"  
                  }

           }

    }

  #close filehandle before detached thread dies out
  close( $lclient);
  #remove multi-echo-clients from echo list
  @clients = grep {$_ !~ $lfileno} @clients;

}
__END__

'''

Answer 1

使用其余参数将其传递给processit（）。