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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"IRkernel does not handle interrupt_message control message","articleBody":"\u003c!--Before submitting an issue please be sure you can check these boxes (`[ ]` → `[x]`):--\u003e\r\n\r\n- [x] I followed the [official installation instructions](https://irkernel.github.io/installation/)\r\n  \u003c!--If you have an installation problem, a segfault, `caught illegal operation`, `cannot open shared object file`,  …\r\n      and installed IRkernel using Anaconda, please report your issue to them instead.--\u003e\r\n- [x] I reproduced the error with the newest versions of `IRkernel`, `IRdisplay`, and `repr`\r\n  \u003c!--If the following code installs packages, you didn’t yet:\r\n      old_pkgs \u003c- intersect(old.packages()[, 'Package'], c('IRkernel', 'IRdisplay', 'repr'))\r\n      if (length(old_pkgs) \u003e 0) install.packages(old_pkgs)\r\n  --\u003e\r\n- [ ] I included a [minimal reproducible example](https://stackoverflow.com/a/5963610/247482)\r\n- [x] This the right repository: I think the issue is with IRkernel, not\r\n      [IRkernel/repr](https://github.com/IRkernel/repr/issues/new) or a third party repository\r\n  \u003c!--If the way a value is displayed is ugly or you got `ERROR while rich displaying an object`, it’s a `repr` problem.\r\n      If an error stack trace or the install log shows a problem in another package, go to its issue tracker.--\u003e\r\n\r\nMy team deploys IRkernel 1.3.1 as remote kernels for a Jupyter-compatible notebook webapp.\r\n\r\nWe install it in a Docker image with ```IRkernel::installspec(user = FALSE)```.\r\n\r\nOur architecture implements implements the [Messaging protocol here](https://jupyter-client.readthedocs.io/en/stable/messaging.html#) for communicating with Jupyter kernels.\r\n\r\nThe issue we encounter is in interrupting the kernels. We send [the `interrupt_request` message type to the remote kernel via the CONTROL channel](https://jupyter-client.readthedocs.io/en/stable/messaging.html#kernel-interrupt). This works well for [ipykernel](https://github.com/ipython/ipykernel/blob/v6.20.1/ipykernel/kernelbase.py#L910-L915), but not at all for IRkernel.\r\n\r\nDigging into the code for v1.3.1 I see that the kernel [handles only one message in the CONTROL channel](https://github.com/IRkernel/IRkernel/blob/1.3.1/R/kernel.r#L329-L340), `shutdown_request`.\r\n\r\nIt would be nice if IRkernel could handle the `interrupt_request` message type the same way it does with SIGINT.\r\n\r\n## Related\r\n\r\nThis might be related to this issue with Jupyter Notebook https://github.com/IRkernel/IRkernel/issues/677\r\n\r\nAnd implementation could be similar to https://github.com/IRkernel/IRkernel/pull/704 for `kernel_info_request`.\r\n","author":{"url":"https://github.com/ahjota","@type":"Person","name":"ahjota"},"datePublished":"2023-01-12T19:29:31.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":0},"url":"https://github.com/727/IRkernel/issues/727"}