hi, i have piece of code utilizing Net::SNMP to query printers. sometimes it takes real long time to finish the query.I have used the -timeout and it doesn't appear do anything. now i am using eval and alarm but run into a problem. 

sub fun1 {

  foreach (printers ){
        my ($session, $error) = Net::SNMP->session(
              -hostname  => $ip,
              -community => chomp($cmnt),
              -port      => 161,
              -timeout   => 5,
        );

        my $result = $session->get_request(
              -varbindlist => [$OID]
        );

     eval {
        local $SIG{ALRM} = sub { die "alarm\n" }; 
        alarm 5;
            $result = $session->get_request(
                  -varbindlist => [$oid]
            );
        alarm 0;
        };
            $row .= lc($result->{$oid})."-";
   }
}

[download]
in the foreachloop, only the first loop times out within the eval block. the rest of loops takes less than 5 seconds to finish. however, after the first loop, $result->{$oid} is always empty. which isn't if i take out of the eval block. any idea ?

In reply to eval alarm on mod_perl by Qiang

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.