select()

Fri Oct 9 08:58:00 GMT 1998

Todd M. Grimm said:
>> I am using select() to test whether there are bytes on a socket to read 
> without blocking my program to check on this.
>> The problem is that even when there is no data it returns a 1 to say that 
> there is data. This causes my program to try a read which blocks because 
> there really is no data.
>> I saw several messages in the archives of this list about this, but all I 
> could find were questions. No one ever seemed to answer the question.
>> Please let me know if you know how to get select() to work right or if 
> there is a nother way to test for bytes without blocking.

 Without seeing the code it is impossible to judge what is
happening, but in general, select returns whether a socket is
*ready*, not just readable. For example, if the other end has
closed the connection select() will return that the socket is
ready. A read on the socket will return 0 to indicate the
close.
 Regards,
 Harry.
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