RFR: 8357179: Deprecate VFORK launch mechanism from Process implementation (linux) [v2]

[Aleksey Shipilev]

On Mon, 19 May 2025 16:59:06 GMT, Thomas Stuefe <stuefe at openjdk.org> wrote:

>> For the ratio behind this please see the companion CSR: https://bugs.openjdk.org/browse/JDK-8357180.
>> 
>> We plan to deprecate this in JDK 25 and to remove it in JDK 26.
>> 
>> This patch just writes a deprecation message to stderr:
>> 
>> 
>> 08:46:38 thomas at starfish java -Djdk.lang.Process.launchMechanism=VFORK SimpleSpawn ls
>> VFORK MODE DEPRECATED
>> The VFORK launch mechanism has been deprecated for being dangerous.
>> It will be removed in a future java version. Either remove the
>> jdk.lang.Process.launchMechanism property (preferred) or use FORK mode
>> instead (-Djdk.lang.Process.launchMechanism=FORK).
>> ...
>
> Thomas Stuefe has updated the pull request incrementally with one additional commit since the last revision:
> 
>   use string block

`VFORK` deprecation sneaked up on me. I filed [JDK-8357436](https://bugs.openjdk.org/browse/JDK-8357436) to amend `jspawnhelper` warning message.

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PR Comment: https://git.openjdk.org/jdk/pull/25282#issuecomment-2897063928