RFR: 8294899: Process.waitFor() throws IllegalThreadStateException when a process on Windows returns an exit code of 259

[Jaikiran Pai]

On Wed, 12 Oct 2022 16:30:07 GMT, Roger Riggs <rriggs at openjdk.org> wrote:

> Process.waitFor() throws IllegalThreadStateException when a process returns an exit code of 259.
> As described in the bug report, `waitFor()` should not be sensitive to the exit value.
> Previously, it erroneously threw IllegalStateException.
> Added a test to verify.

The reporter of the issue provided additional details that it was their own application/program which was returning that exit value:

> I encountered it while prototyping an idea involving a Java application spawning a process running a C++ application that returned an exit value indicating the number of items it processed.

So this appears like the case where this change would help. I haven't found any conclusive/official Windows documentation which forbids user applications from returning this exit value (which represents `STILL_ACTIVE`).

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PR: https://git.openjdk.org/jdk/pull/10680