RFR: 8337143: (fc, fs) Move filesystem-related native objects from libnio to libjava [v2]

[Brian Burkhalter]

On Fri, 26 Jul 2024 19:40:24 GMT, Brian Burkhalter <bpb at openjdk.org> wrote:

>> This proposed change would move the native objects required for NIO file interaction from the libnio native library to the libjava native library on Linux, macOS, and Windows.
>
> Brian Burkhalter has updated the pull request incrementally with one additional commit since the last revision:
> 
>   8337143: Move natives to <platform>/native/libjava/nio/{ch,fs} as a function of their original location in libnio

As part of 7e8a02e, the `nio_util.h` header files were modified. One unused symbolic constant was removed. Symbolic constants used in only one file were moved to that file. Function declarations that were only used where the function is defined were removed. Function declarations used in only one file other than the one where the function is defined were moved to an `extern` in that file. On Unix, one function declaration used in three files was moved to a new header file `Net.h`.

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PR Comment: https://git.openjdk.org/jdk/pull/20317#issuecomment-2273748931