Here's a example server and socket:

server.pl

use strict;
use warnings;

use IO::Socket ();

my $listen_fh = IO::Socket->new(
    Domain    => IO::Socket::AF_INET(),
    Proto     => 'tcp',
    LocalAddr => '127.0.0.1',
    Listen    => 1,
) or die("Unable to create listening socket: $!$/");

print('Listening on port ', $listen_fh->sockport(), '.', $/);

my $client_fh = $listen_fh->accept()
or die("Unable to accept a connection: $!$/");

print('Accepted a connection from ', $client_fh->peerhost(), ':', $cli
+ent_fh->peerport(), '.', $/);

while (<$client_fh>) {
   print $client_fh uc($_);
}

print('Connection closed by client or by error.', $/);

[download]

client.pl


use strict;
use warnings;

use IO::Socket ();

my $peer_port = shift(@ARGV)
or die("Specify the port on the command line.$/");

my $server_fh = IO::Socket->new(
    Domain   => IO::Socket::AF_INET(),
    Proto    => 'tcp',
    PeerAddr => '127.0.0.1',
    PeerPort => $peer_port,
) or die("Unable to connect to server: $!$/");

print('Connected to ', $server_fh->peerhost(), ':', $server_fh->peerpo
+rt(), '.', $/);

print('Type stuff to be uppercased by server. Blank line to exit.', $/
+);

for (;;) {
   last if (!defined($_ = <STDIN>) || $_ eq $/);
   print $server_fh $_;
   last if (!defined($_ = <$server_fh>));
   print;
}

print('Connection closed by server or by error or by request.', $/);

[download]

In reply to Re^2: two-way socket works once only? by ikegami
in thread two-way socket works once only? by wolfger

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