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Re^6: Timeout for an established connection

by 0day (Sexton)
on Jan 02, 2013 at 20:41 UTC ( #1011341=note: print w/ replies, xml ) Need Help??


in reply to Re^5: Timeout for an established connection
in thread Timeout for an established connection

Dear BrowserUk, thank you for your reply.
Please tell me what to do if the call setsokopt
setsockopt($sock, 6, 18, pack("QQ", 5, 0)) or die "setsockopt SOL_TCP, TCP_USER_TIMEOUT: $!\n";
returns an error "protocol not available"?


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Re^7: Timeout for an established connection
by BrowserUk (Pope) on Jan 02, 2013 at 21:05 UTC
    "protocol not available"

    Assuming you're on some form of *nix, you could investigate whether a newer version based on a later kernel has implemented this (relatively new) option in its tcpip stack.

    Barring that, you would have no option but to effectively implement it yourself within your application.

    One way to do that would be each time you successfully send a request, push the socket handle for that client into a hash of arrays keyed by the timeout elapse time. And then each time your poll returns or times out, once you have dealt with any events returned by poll, inspect the array for the curent timeslot (if any), close the handles and remove them from your poll list.

    In an attempt to clarify: After a successful send, push the socket handle to an array keyed by the current time rounded to neasest second + your desired timeout:

    if( $sock->send( <rRE> ) ) { push @{ $timeouts{ int( time() ) + 10 ) }, $sock; } else { ## handle send failures }

    The, at the bottom o fyour poll loop:

    ... for my $sock ( @{ $timeouts{ int( time() ) { shutdown $sock, 2; close $sock; $poll->remove( $sock ); ## log failure. }

    With the rise and rise of 'Social' network sites: 'Computers are making people easier to use everyday'
    Examine what is said, not who speaks -- Silence betokens consent -- Love the truth but pardon error.
    "Science is about questioning the status quo. Questioning authority".
    In the absence of evidence, opinion is indistinguishable from prejudice.
      Thank you. This is something I have long done.

        What OS are you using?

        It looks like all linux kernels since 2.6.32 has implemented TCP_USER_TIMEOUT; which would definitely be the better option if it is available to you.

        This is something I have long done.

        Hm. Makes me wonder why you are asking here, if you already have a solution?


        With the rise and rise of 'Social' network sites: 'Computers are making people easier to use everyday'
        Examine what is said, not who speaks -- Silence betokens consent -- Love the truth but pardon error.
        "Science is about questioning the status quo. Questioning authority".
        In the absence of evidence, opinion is indistinguishable from prejudice.

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