You can simply your code greatly by using IO::Socket::INET. For example, 
use Socket qw( PF_INET SOCK_STREAM inet_aton );

$proto = getprotobyname("tcp");
$iaddr = inet_aton($host) or
    die "Invalid host : $!\n";
$paddr = sockaddr_in($port,$iaddr);

socket(SOCKET,PF_INET,SOCK_STREAM,$proto) or
    die "socket: $!\n";

connect(SOCKET,$paddr) or
    die "connect: $!\n";

my $old_fh = select(SOCKET);
$|=1;
select($old_fh);

[download]

can be written as: 

use IO::Socket::INET qw( );

my $sock = IO::Socket::INET->new(
   Proto    => 'tcp',
   PeerAddr => $host,
   PeerPort => $port,
) or die("Unable to create client socket: $!\n");

[download]

The server would be 

use IO::Socket::INET qw( );
use Socket           qw( SOMAXCONN );

my $server_sock = IO::Socket::INET->new(
   Proto     => 'tcp',
   LocalPort => $port,
   ReuseAddr => 1,
   Listen    => SOMAXCONN,
) or die("Unable to create server socket: $!\n");

[download]

As an additional bonus, IO::Socket::INET turns on autoflush for the socket, so if kyle is correct, it will also fix your problem.

In reply to Re: Client/server issues - Server is not receiving information until client closes the connection by ikegami
in thread Client/server issues - Server is not receiving information until client closes the connection by sergey

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