[zeromq-dev] czmq_new() and automatically installed signal handlers

[Felipe Cruz]

I just made a PR to restore original sighandlers in zctx_destroy (and tests)


2013/1/3 Andy Ballingall TF <ballingall at thefoundry.co.uk>

> You're going to run into trouble if you want to exit any 0MQ loop, if
>> your application is catching the signals, unless you emulate something
>> like zctx_interrupted.
>>
>
> In this scenario, I was envisaging that the application would be obliged
> to state whether it handled the signals in question, and if so, would
> additionally be obliged to call a function in my library which would set
> zctx_interrupted to 1.
>
>
>>
>> Assuming you have an answer for that, I'd suggest a simple change; if
>> zctx_interrupted is non-zero, don't install a signal handler.
>>
>> Yes, that's perfect. So I'll just temporarily set zctx_interrupted to 1
> prior to calling zctx_new() and reset it to 0 immediately afterwards so
> that my reactor will run normally.
>
> Many thanks,
> Andy
>
>
>> I've made a patch that does this:
>>
>> https://github.com/hintjens/czmq/commit/4491c46f2063442eafcaffcebaa31e54dc2ecdf4
>>
>> Waiting for someone to merge to master along with other changes at
>> https://github.com/zeromq/czmq/pull/106.
>>
>> -Pieter
>>
>> On Mon, Dec 31, 2012 at 5:52 PM, Andy Ballingall TF
>> <ballingall at thefoundry.co.uk> wrote:
>> > If you call zctx_new(), then it automatically adds a signal handler
>> which
>> > captures SIGINT and SIGTERM. (At least for *nix)
>> >
>> > I'm using czmq to add new functionality to existing applications, some
>> of
>> > which already have signal handling in place, so that's going to be an
>> issue.
>> >
>> > Has anyone discussed making the signal handling addition an option when
>> > calling zctx_new()?
>> >
>> > (This is the only discussion I could find and it isn't quite what I'm
>> after)
>> >
>> >
>> http://grokbase.com/t/zeromq/zeromq-dev/11cpsq2ccg/czmq-zctx-new-signal-handler-side-effect
>> >
>> > Andy
>> >
>> >
>> > --
>> > Andy Ballingall
>> > Senior Software Engineer
>> >
>> > The Foundry
>> > 6th Floor, The Communications Building,
>> > 48, Leicester Square,
>> > London, WC2H 7LT, UK
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>> >
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>
>
>
> --
> Andy Ballingall
> Senior Software Engineer
>
> The Foundry
> 6th Floor, The Communications Building,
> 48, Leicester Square,
> London, WC2H 7LT, UK
> Tel: +44 (0)20 7968 6828 - Fax: +44 (0)20 7930 8906
> Web: http://www.thefoundry.co.uk/
>
> The Foundry Visionmongers Ltd.
> Registered in England and Wales No: 4642027
>
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