RFR: 8364361: [process] java.lang.Process should implement Closeable [v22]

[Alan Bateman]

On Mon, 27 Oct 2025 02:10:05 GMT, Roger Riggs <rriggs at openjdk.org> wrote:

>> The teardown of a Process launched by `ProcessBuilder` includes the closing of streams and ensuring the termination of the process is the responsibility of the caller. The `Process.close()` method provides a clear and obvious way to ensure all the streams are closed and the process terminated.
>> 
>> The try-with-resources statement is frequently used to open streams and ensure they are closed on exiting the block. By implementing `AutoClosable.close()` the completeness of closing the streams and process termination can be done by try-with-resources.
>> 
>> The actions of the `close()` method are to close each stream and destroy the process if it has not terminated.
>
> Roger Riggs has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Corrected ProcessCloseTest to expect a racy result from "echo abc" and Process.close.

src/java.base/share/classes/java/lang/Process.java line 212:

> 210:      * The {@code outputWriter} and {@code outputStream} to the process are closed.
> 211:      * The {@code inputReader} and {@code inputStream} from the process are closed.
> 212:      * The {@code errorReader} and {@code errorStream} from the process are closed.

The implSpec is quite verbose as it lists all 6 streams and character streams. Maybe shorten to say that the method first closes all I/O streams, then waits for the process to terminate?

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PR Review Comment: https://git.openjdk.org/jdk/pull/26649#discussion_r2466405551