Undocumented {packet,http} and gen_tcp:recv/3 timeout

Sean Hinde <>
Tue Nov 1 21:59:53 CET 2005


Hi!

Yes, indeed. I will fix the tutorial.

Sean

On 1 Nov 2005, at 20:01, Eric Merritt wrote:

> Just for future reference, Pete pointed out the race condition in
> iserve_socket:init. It's an easy fix and pretty noticeable once you
> think about it.
>
> ---------- Forwarded message ----------
> From: Pete Kazmier <>
> Date: Oct 31, 2005 1:20 PM
> Subject: Re: Undocumented {packet,http} and gen_tcp:recv/3 timeout
> To: Eric Merritt <>
>
>
> Hi there,
>
> I recently went through that same tutorial and found the bug that the
> author hinted at in his recent post to the mailing list.  In the event
> that you have not already found it, there is a race condition within
> iserve_socket:init in between the gen_tcp:accept and inet:setsockopts
> call.  Its possible that part of the HTTP request arrives before the
> socket is placed it {packet, http} mode, and since the socket is in
> active mode, a message would be delivered to the current process which
> does nothing with it.  In this case, inet:setsockopts needs to be
> called on the listening socket so the accepted socket will be in
> {packet, http} right from the start.
>
> As an erlang newbie, I still have not been able to get his example to
> run yet as I can't figure out appropriate directory layout for the
> application.  If you have this working, would you mind sending me a
> tarball of the directory?  It would be very helpful!
>
> Thanks,
> Pete
>




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