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> FWIW, there are times when we *want* the interrupted system call to
> return control to Python rather than retrying the call.
I'm a bit curious, do you know of any use cases?
> If someone is making a Python equivalent of the low level system call
> such as select() or poll(), the EINTR should be exposed for Python
> code to handle.
As mentioned in another issue, you would use a special wakeup fd to
wakeup select() or poll() calls.
> Getting an EINTR errno does *not* mean you can simply retry the system
> calls with the exact same arguments. ie: If you did that with the
> select() call within time.sleep it'd be trivial to make the process
> sleep forever by sending it signals with a frequency less than the
> sleep time.
Indeed. That's already done in e.g. socketmodule.c : take a look at the
BEGIN_SELECT_LOOP / END_SELECT_LOOP macros.