[Python-3000] Non-blocking I/O? (Draft PEP for New IO system)
daniel at stutzbachenterprises.com
Wed Mar 7 03:52:09 CET 2007
On 3/6/07, Adam Olsen <rhamph at gmail.com> wrote:
> What's the rationale for IOError instead of ValueError? Isn't it an
> error in the application to apply the buffering layer to a
> non-blocking socket, and not something related to a connection reset?
The buffering layer can't easily detect that the file object is
non-blocking a priori. It only finds out when a system call returns
-1 and errno is set to EAGAIN. In the meantime, it might have
actually read or writen some data. An IOError makes it more clear
that something went awry, while a ValueError typically implies that
the operation was rejected altogether.
Daniel Stutzbach, Ph.D. President, Stutzbach Enterprises LLC
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