RFR: 8349812: (fs) Files.newByteChannel with empty path name and CREATE_NEW throws unexpected exception [v3]

[Brian Burkhalter]

On Wed, 12 Feb 2025 10:13:27 GMT, Maxim Kartashev <mkartashev at openjdk.org> wrote:

>> `UnixFileChannelFactory.open()` checks for the current directory by looking at the first byte of the name, which in case of an empty path is simply not there. This check throws an `ArrayIndexOutOfBoundsException` and prevents the correct exception from being thrown.
>> 
>> The suggested solution is to use another method that translates a path name into a byte array called `getByteArrayForSysCalls()` that is specifically designed to handle the case of empty path names.
>> 
>> Tested by running `java/nio` tests on Linux.
>
> Maxim Kartashev has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Extended the test for empty path name

test/jdk/java/nio/file/Files/SBC.java line 444:

> 442:         } catch (FileSystemException x) { }
> 443: 
> 444:         try (var channel = Files.newByteChannel(Path.of(""), READ, LinkOption.NOFOLLOW_LINKS)) {

This sub-test fails on Windows with a `java.nio.file.AccessDeniedException`.

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PR Review Comment: https://git.openjdk.org/jdk/pull/23560#discussion_r1953452170