Bruce Momjian <pgman@candle.pha.pa.us> writes:
> The only guess I have is that select() is modifying the timeout
> structure on return, but I didn't think it did that, does it?

You shouldn't assume so; I think it does on some platforms.  The Single
Unix Spec says

        On successful completion, the object pointed to by the timeout
        argument may be modified. 

                        regards, tom lane

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