fix: change kill to signal the whole process group to terminate

[petuomin]

In the PR that improves the ctrl+c, the signal handling may have been accidentally changed to kill just the process instead of the process group.

We are using puppeteer to launch a bash script that starts xvfb and then chrome. Since the bash script receives the SIGKILL, it has no change to do cleanup, leaving a dangling xvfb. Signaling the process group fixes the issue.

Note: I'm not familiar with Windows. The code in this PR is from BrowserRunner.ts before PR6011 was applied. It seems like it should be right based on this: https://docs.microsoft.com/en-us/windows-server/administration/windows-commands/taskkill

Note2: The nodejs documentation states: "Sending signal 0 can be used as a platform independent way to test for the existence of a process." However the documentation does not state whether it will throw an error with code ESRCH on Windows.

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[petuomin]

Ah, the CI is kind enough to provide some answers regarding the windows platform.

[mathiasbynens]

@TimvdLippe PTAL since this refers to your earlier patch

[TimvdLippe]

Ah that's unfortunate, sorry for causing unexpected regressions. At this point, I think we would benefit from having several tests that we can run to ensure that numerous process configurations and launches are behaving as expected.

Sadly I don't have the cycles myself to work on that, but @petuomin would you in a position to do so?

Ideally, we have a set of tests that can verify that launching Puppeteer as the main process, in bash scripts and on multiple platforms and that all processes are cleaned up appropriately. I am not aware of prior art in this area and I especially don't really know how you would be able to obtain process information on platforms such as Windows. Let me know if you are up for the challenge and I would happily assist wherever possible!

[petuomin]

@googlebot I signed it!

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[petuomin]

No worries, we were able to figure out a workaround for us for now.

I'll try to find some time to work on this. It might take a while though as I, too, will have to learn some windows.

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[jschfflr]

This change looks good to me! As it's basically restoring previous (also untested) behaviour, I would be happy to land this for now and figure out a better way to test this in a follow up change. Let me know what you think @TimvdLippe

[jschfflr]

@googlebot I signed it!

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[jschfflr]

@petuomin It looks like the @googlebot couldn't verify that you signed the cla yet. Could maybe check if you did and post another @googlebot I signed it!. Thanks!

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[jschfflr]

@petuomin Also, it looks like your change doesn't quite work on windows yet - could you also look into that?

[TimvdLippe]

@jschfflr I am happy with relanding, but I don't think the current fix works quite yet. Unfortunately I don't have the resources to check what is going on, but I have no objections to this PR 😄

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[jschfflr]

@googlebot I signed it!

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[jschfflr]

@petuomin I changed the implementation to ignore taskkill failures as it looks like all processes will be successfully cleaned on windows anyways.
Please make sure to get the CLA signed and I'm happy to get this landed!

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[jschfflr]

@googlebot I consent!

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[jschfflr]

@petuomin Could you make sure to sign the CLA with the email address you used to create the commit?
It looks like the google bot didn't catch that one yet :/