Beefy Boxes and Bandwidth Generously Provided by pair Networks
There's more than one way to do things

Comment on

( #3333=superdoc: print w/ replies, xml ) Need Help??

The only practical way that I have ever found to determine whether a client has crashed is to oblige the protocol between the two to periodically send a “heartbeat” message if there is nothing else to be sent during some mutually agreed-upon interval.   The host should record the latest timestamp as each socket sends a message, or just a boolean flag, and use a periodic timer, say about half-again as long as the heartbeat, to check for absence of response within that time.   Upon which the host might presume that the client is dead.   You see, you really can’t be 100% sure, AFAIK, that all of the intermediates between here-and-there are still in good working order.   Maybe the host knows that the socket has been closed or that communication has failed, or maybe it doesn’t.   But if a bottle washes up on shore, even if it’s empty, you know the sender is still out there.

In reply to Re: IO::Select and correct way to detect client crashed? by sundialsvc4
in thread IO::Select and correct way to detect client crashed? by flexvault

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, 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, 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.
  • Log In?

    What's my password?
    Create A New User
    and the web crawler heard nothing...

    How do I use this? | Other CB clients
    Other Users?
    Others perusing the Monastery: (4)
    As of 2015-11-27 20:58 GMT
    Find Nodes?
      Voting Booth?

      What would be the most significant thing to happen if a rope (or wire) tied the Earth and the Moon together?

      Results (732 votes), past polls