I don't know if this is related (regarding functions registered in C) but one problem I often have is to always execute exit functions. I have come up with this: http://grodola.blogspot.com/2016/02/how-to-always-execute-exit-functions-in-py.html
On Fri, Jan 20, 2017 at 1:46 PM, Thomas Kluyver <tho...@kluyver.me.uk> wrote: > Not uncommonly, I want to do something like this in code: > > import signal > > # Install my own signal handler > prev_hup = signal.signal(signal.SIGHUP, my_handler) > prev_term = signal.signal(signal.SIGTERM, my_handler) > try: > do_something_else() > finally: > # Restore previous signal handlers > signal.signal(signal.SIGHUP, prev_hup) > signal.signal(signal.SIGTERM, prev_term) > > This works if the existing signal handler is a Python function, or the > special values SIG_IGN (ignore) or SIG_DFL (default). However, it breaks > if code has set a signal handler in C: this is not returned, and there > is no way in Python to reinstate a C-level signal handler once we've > replaced it from Python. > > I propose two possible solutions: > > 1. The high-level approach: a context manager which can temporarily set > one or more signal handlers. If this was implemented in C, it could > restore C-level as well as Python-level signal handlers. > > 2. A lower level approach: signal() and getsignal() would gain the > ability to return an opaque object which refers to a C-level signal > handler. The only use for this would be to pass it back to > signal.signal() to set it as a signal handler again. The context manager > from (1) could then be implemented in Python. > > Crosslinking http://bugs.python.org/issue13285 > > Thomas > _______________________________________________ > Python-ideas mailing list > Python-ideas@python.org > https://mail.python.org/mailman/listinfo/python-ideas > Code of Conduct: http://python.org/psf/codeofconduct/ > -- Giampaolo - http://grodola.blogspot.com
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