[issue16105] Pass read only FD to signal.set_wakeup_fd

[Felipe Cruz]

Felipe Cruz added the comment:

> Raising an error in case the signal can't be written to the FD
> (because the other end didn't drain the pipe/socket) seems reasonable.
> You should just retry on EINTR (although any sane implementation
> shouldn't return EINTR on non-blocking write, I don't think it's
> strictly prohibited by POSIX).

You mean retry one time or until success?

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Added file: http://bugs.python.org/file27406/issue16105_v2.patch

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