RFR: 8330998: System.console() writes to stderr when stdout is redirected [v3]

[Jan Lahoda]

> Consider code like:
> 
> public class ConsoleTest {
>     public static void main(String... args) {
>         System.console().printf("Hello!");
>     }
> }
> 
> 
> When run as:
> 
> $ java ConsoleTest.java >/dev/null
> 
> 
> it prints `Hello!` to stderr, instead of to stdout (where it would be redirected).
> 
> The proposed fix is to simply force the use of stdout. Sadly, this cannot be done solely using JLine configuration, we actually need to change the JLine's code for that.
> 
> The most tricky part is a test. There are two sub-tests, one effectively testing a case where all of stdin/out/err are redirected, the other is attempting to test the case where stdin is attached to a terminal, while stdout is redirected. The second sub-test using a native functions to create a pty and to attach to it, and should run in a separate VM, as it leaves the VM attached to the terminal.

Jan Lahoda has updated the pull request incrementally with one additional commit since the last revision:

  Adjusting test, as suggested.

-------------

Changes:
  - all: https://git.openjdk.org/jdk/pull/18996/files
  - new: https://git.openjdk.org/jdk/pull/18996/files/8a918e3f..76599ac9

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=18996&range=02
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=18996&range=01-02

  Stats: 57 lines in 1 file changed: 6 ins; 35 del; 16 mod
  Patch: https://git.openjdk.org/jdk/pull/18996.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/18996/head:pull/18996

PR: https://git.openjdk.org/jdk/pull/18996