The customer I am working with uses sockets in a way I am not used to.
I need to behave as a client program, I read data from their socket (host/port on their machine) and respond with an ack.
When I want to send the data I do the usual and write to their host/port and wait for an ack.
Using the following simple read I continually see the most recent write by them on their port till the replace it with new data. Is that expected or am I doing something wrong? 
#!/usr/local/bin/perl
use strict;
use Socket;
use IO::Handle;
my $prot = getprotobyname('tcp');
my $host = inet_aton("localhost");
socket(SOCK, AF_INET, SOCK_STREAM, $prot) or die("socket failed to sta
+rt");
my $dest_addr = sockaddr_in(5003, $host);
connect(SOCK, $dest_addr) or die("Connect failed");
my $data;
while (1) {
   print STDERR "do a read\n";
   sysread(SOCK, $data, 1024);           # reads the data on the serve
+rs socket
                                         # but when loop around again 
+the data is still there as server 
                                         # has not written anything ne
+w
   print STDERR "data was $data\n";
   sleep 10;
}
close SOCK;

[download]

In reply to Read Socket on Server by ipentinmaki

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post, it's "PerlMonks-approved HTML":


  • Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
  • Titles consisting of a single word are discouraged, and in most cases are disallowed outright.
  • Read Where should I post X? if you're not absolutely sure you're posting in the right place.
  • Please read these before you post! —
  • Posts may use any of the Perl Monks Approved HTML tags:
    a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, details, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, summary, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
  • You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
            For:     Use:
    & &amp;
    < &lt;
    > &gt;
    [ &#91;
    ] &#93;
  • Link using PerlMonks shortcuts! What shortcuts can I use for linking?
  • See Writeup Formatting Tips and other pages linked from there for more info.