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how to calculate the size of sys.stdin?

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grante at visi.com (Grant Edwards) writes:> In article <mailman.987030856.375.python-list at python.org>, Robin Thomas wrote:>> >sys.stdin is more like a pipe, and not a regular file. You> >can't ask a pipe how many bytes it contains before you read> >from it.>> Actually, you can.>> At least on some Unix systems, the FIONREAD ioctl() call will> tell you how many bytes there are in a pipe waiting to be read.> IIRC, it also works on some tty devices as well. Probably not> very portable, and somebody could have shoved more bytes into> the other end after the ioctl() and before the read(), so you> could get more that you expect, but you shouldn't get less.That's interesting for a pet project of mine.  How on earth does onego about learning things like that?  Is this sort of stuff in Stevens'APUE?Cheers,M.--   We did requirements and task analysis, iterative design, and user  testing. You'd almost think programming languages were an interface  between people and computers.                    -- Steven Pemberton          (one of the designers of Python's direct ancestor ABC)

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