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> Wouldn't retrying on EINTR cause havoc when you try to interrupt a process?
All your C applications are doing it, why should Python cause havok there? Check the POSIX specification on that if you don't trust me.
> That is: what would happen with the proposed patch when a python script
> does a read that takes a very long time and the user tries to interrupt 
> the script (by using Ctrl+C to send a SIGTERM)?
EINTR is only returned if nothing was read so far and the call was interrupted in case of fread.
Here a quick explanation from the GNU's libc manual:
http://www.gnu.org/s/libc/manual/html_node/Interrupted-Primitives.html