I have been using the following code in linux to check for hosts with port 80 open. It works fine in linux. In windows, however, the connection attempt does not timout. When there is no response, it ignores the alarm completely and takes about 20 seconds to bomb out. I have tried many different things but cannot get any socket connection attempts to timeout in windows. Any help would be appreciated =)

Best Regards!

smack 
use IO::Socket;
use IO::Scalar;
    
    my $port = 80;
    print "Please enter an IP: ";
    my $ip = <STDIN>;
    print "\nTrying $ip";
    my $TIMEOUT = 3; # seconds
    eval {  
        local $SIG{ALRM} = sub { die "alarm\n" };
        alarm $TIMEOUT;     
        &CheckHost($ip, $port);   
        alarm 0;
        };

    if ($@) {   if($@ eq "alarm\n") {      
          die "Connection Timed out.\n"; } 
    else {      
           print "Socket Closed.\n";   
          }
    }




sub CheckHost() {
    ($hostip, $hostport) = ($_[0], $_[1]);
    my $sock = new IO::Socket::INET (
                                 PeerAddr => "$hostip",
                                 PeerPort => "$hostport",
                                 Proto => 'tcp',
                                    );        
                
    die "Could not create socket: $!\n" unless $sock;
    chomp $hostport;
    print "Port $hostport is active on $hostip\n";
    
    
    close($sock);
    }

[download]

In reply to Windows socket timout code by smack

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.