To resolve java/io/File/GetXSpace.java failure, I fix libGetXSpace.c to use Cygwin’s `df` to get the size for comparison if the test target drive is a CD-ROM drive.
As described in JDK-8343342, GetDiskSpaceInformationW can't get information about the size of the CD-ROM drive. GetDiskFreeSpaceExW can also get information about the size of the CD-ROM drive. However, because GetDiskFreeSpaceExW is called by the File.get-X-Space methods, it seems more reasonable to compare the size got by other way than GetDiskFreeSpaceExW as a test. For this reason, I use Cygwin's `df`. In JDK-8298619, GetDiskSpaceInformationW was adopted instead of `df` because the size got by File.get-X-Space methods may not match the size got by `df` when per-user quotas are used. I don't think this problem applies to CD-ROM drive, so I think we can use Cygwin's `df` for CD-ROM drive. After fix, I ran a test on Windows Server 2019 where drive C is a normal local disk, drive D is an unmounted iso CD-ROM drive, and drive F is an iso mounted CD-ROM drive and confirmed that it passes. I think this fix may also resolves the similar failure reported at https://github.com/openjdk/jdk/pull/12397#issuecomment-1705164515. Thanks ------------- Commit messages: - Add 2>&1 to prevent messages containing "No such file or directory" from being output to System.err on jtr - Fix libGetXSpace.c Changes: https://git.openjdk.org/jdk/pull/21799/files Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=21799&range=00 Issue: https://bugs.openjdk.org/browse/JDK-8343342 Stats: 51 lines in 1 file changed: 49 ins; 0 del; 2 mod Patch: https://git.openjdk.org/jdk/pull/21799.diff Fetch: git fetch https://git.openjdk.org/jdk.git pull/21799/head:pull/21799 PR: https://git.openjdk.org/jdk/pull/21799
