I'm trying to send the output of logfile on an NT machine to a TCP client on a Unix machine.
I've spliced the following script together from the O'Reilly Perl cookbook.

#!/usr/bin/perl -w
require 5.002;
use strict;
BEGIN { $ENV{PATH} = '/usr/ucb:/bin' }
use Socket;
use Carp;
use IO::File;
use IO::Handle;

sub logmsg { print "$0 $$: @_ at ", scalar localtime, "\n" }
my $port = 8068;
my $proto = getprotobyname('tcp');
my $naptime = 1;
my $LOGFILE;
my $curpos;

open ($LOGFILE, 'c:\logfile\log') or die "Can't open logfile: $!";

socket(Server, PF_INET, SOCK_DGRAM, $proto)  or die "socket: $!";
setsockopt(Server, SOL_SOCKET, SO_REUSEADDR, pack("l", 1))
                                             or die "setsockopt:$!";
bind(Server, sockaddr_in($port, INADDR_ANY)) or die "bind: $!";
listen(Server,SOMAXCONN)                     or die "listen: $!";
logmsg "server started on port $port";
my $paddr;
$SIG{CHLD} = \&REAPER;
for ( ; $paddr = accept(Client,Server); close Client) {
  my($port,$iaddr) = sockaddr_in($paddr);
  my $name = gethostbyaddr($iaddr,AF_INET);
  logmsg "connection from $name [",
          inet_ntoa($iaddr), "] at port $port";
  for (;;) {
  my $msg= '';
    for ($curpos = tell($LOGFILE); <$LOGFILE>; 
                   $curpos = tell($LOGFILE)) {
      readline $LOGFILE;
      $msg = $_;
      print Client $msg;
    }
  sleep $naptime;
  seek($LOGFILE, $curpos, 0);
  }
}

[download]
It works with quick updates, but not if the logfile is updated very rarely. It seems as if the script buffers the message before sending.
can anyone see any glaring mistakes?
Please be gentle , its my first time :-)

In reply to Tailing a file to a TCP socket by kmugglet

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