How does ^C work in Python?
dan-ntp at drown.org
Tue Sep 27 18:29:26 UTC 2016
Quoting Hal Murray <hmurray at megapathdsl.net>:
> dan-ntp at drown.org said:
>> Does python have an option to just exit with the sigint signal handler and
>> not rely on the interpreter state?
> That works for "ntpq -p", but there are two cases in ntpq where that isn't
> good enough.
> One is when running in interactive mode. I suppose that could be fixed by
> running each command in a separate thread. If ^C happens, kill that thread
> and ignore it.
> The other is the mrulist command. It's two loops. One to collect the info
> and another to print it out. (there may be a sort in between) ^C during the
> first loop is supposed to stop collecting, then print what has been
So, one way to fix this would be to use a library that calls
poll/select from python, and interruptions are returned back into
For instance: http://www.dnspython.org/
Downside is that it takes more code to do the lookup:
a_records = dns.resolver.query("example.com","A")
aaaa_records = dns.resolver.query("example.com","AAAA")
# merge A/AAAA records here.
Upside is ^C works properly:
^C Traceback (most recent call last):
File "/usr/lib/python2.7/site-packages/dns/query.py", line 70, in _poll_for
event_list = pollable.poll(long(timeout * 1000))
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