Cancel read on socket

[Joel Sherrill]

Sergei Organov wrote:
> Leon Pollak <leonp at plris.com> writes:
>
>   
>> On Monday, 26 בMay 2008, Sergei Organov wrote:
>>     
>>> shutdown()
>>>       
>> I studied the internet again.
>> And again I am afraid that shutdown will not help - please, correct me if I am
>> wrong:
>> 1. shutdown seems not to cancel currently in progress "read" operation (which
>> blocked the task now).
>>     
>
> Well, I'm not sure about UDP sockets, but for TCP sockets it should cancel
> read operation the same way as if remote end had closed connection, I
> believe. Though the socket won't be useful for reading after that anyway.
>
> Alternate approach to your problem could be to configure receive timeout
> for the socket, like this:
>
>   setsockopt(s, SOL_SOCKET, SO_RCVTIMEO, &tv, len);
>   
Without thinking about compatibility at all, shouldn't it be
possible to add an RTEMS specific IOCTL which forced
a read() to return an error like ECANCELED? 

> -- Sergei.
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>   


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Joel Sherrill, Ph.D.             Director of Research & Development
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