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Showing content from https://mail.python.org/pipermail/python-dev/2002-September/028870.html below:

[Python-Dev] Assign to errno allowed?

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> but PyErr_SetExcFromWindowsErr is not present in the 2.2
> maintainance branch. An easier fix would be this one, but
> I wonder if it is allowed/good style to set 'errno':
>
> *** 274,279 ****
> --- 274,282 ----
>    Py_END_ALLOW_THREADS
>
>    if (n < 0) {
> + #ifdef MS_WINDOWS
> +   errno = WSAGetLastError();
> + #endif
>     PyErr_SetFromErrno(SelectError);
>    }
>    else if (n == 0) {

Well, I'd agree it's not good style - therefore it deserves a comment
<wink>.  I'd say with a reasonable comment you should just go for it.

BDFL-pronouncement-not-withstanding ly,

Mark.

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