Re: [tcpm] Is this a problem?

[Mahesh Jethanandani <[e-mail]>]

Ethan,

Would we not receive a EWOULDBLOCK if the connection was throttled 
because of congestion in the network? Under the scenario you describe we 
would have timed out a connection that was either slow or congested. Is 
that true?

Ethan Blanton wrote:
> Ethan Blanton spake unto us the following wisdom:
>   
>> It is my understanding (correct me if I am wrong) that close() returns
>> immediately, regardless of queued data in the send buffer.  In
>> addition, I am not aware of any way to force a reset on a TCP socket
>> without pending data in the read buffer.
>>     
>
> SO_LINGER is indeed more flexible than I have used it for -- it can be
> used to solve both of these problems.  For the benefit of those
> listening:
>
> 1) Set SO_LINGER with l_onoff != 0 and l_linger = timeout in seconds.
> 2) If a nonblocking close returns EWOULDBLOCK, the linger timeout
>    expired, so:
>    2a) set SO_LINGER with l_onoff != 0 and l_linger = 0
>    2b) call close, which will emit a RST
>
> I recant my previous claims -- this can be handled cleanly with
> standard sockets.
>
>   
>>>> It does not seem unreasonable to add a zero-window timeout tunable to
>>>> any given TCP implementation; I don't necessarily think it is a TCP
>>>> standardization issue, however, as there is no wire impact.
>>>>         
>
> I do stand by this, however.
>
> Ethan
>
>   
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