RFR: 8234262: Unmask SIGQUIT in a child process [v3]

[Roger Riggs]

On Fri, 23 Sep 2022 03:25:49 GMT, Thomas Stuefe <stuefe at openjdk.org> wrote:

>> Roger Riggs has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   Move clearing of the signal mask to jspawnhelper so the launched
>>   process gets a clear signal mask.
>
> test/jdk/java/lang/ProcessBuilder/UnblockSignals.java line 37:
> 
>> 35:     public static void main(String[] args)  throws IOException, InterruptedException {
>> 36:         // Check that SIGQUIT is not masked, in previous releases it was masked
>> 37:         final ProcessBuilder pb = new ProcessBuilder("sleep", "30").inheritIO();
> 
> SIGQUITing the child may leave a core dump. You may want to wrap the sleep in a shell call with ulimit to prevent that, e.g. 
> 
> `new ProcessBuilder("sh", "-c", "ulimit -c 0 && sleep 30");`

That doesn't work as intended; the `sh` is killed, not the sleep; and the core dump would be of `sh`.
The core dump of sleep will be small, I think it can be tolerated if it happens.

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PR: https://git.openjdk.org/jdk/pull/10379