Antoine Pitrou <pit...@free.fr> added the comment:
> An errno+ferror approach works except for two cases:
>
> (1) MS fgets() does not consider reading from a write-only stream
> an error. While annoying, I think this is standard conforming.
>
> (2) OpenSolaris sets errno unreliably after getc.
>
>
> I do not know how to get around those without using OS specifics.
Ok, then perhaps it's better to have some internal {readable, writable}
flags based on the original mode string.
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<http://bugs.python.org/issue5677>
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