Proposal for adding O_DIRECT support into JDK 9

[Brian Burkhalter]

On Sep 7, 2017, at 12:41 PM, Lu, Yingqi <yingqi.lu at intel.com> wrote:

> I tested your patch and it works on both MacOS and Linux both. I will include it in the next version of the patch.
>  
> Please also let me know if you see anything missing from the build+regession test.

This patch fixes the build problem on all Unix platforms, but when I run the Direct I/O tests locally on macOS I get this error

java.lang.UnsatisfiedLinkError: Native Library /Users/bpb/Work/CoreLibs/jdk/jdk10/dev/build/macosx-x86_64-normal-server-fastdebug/support/test/jdk/jtreg/native/lib/libDirectIO.dylib already loaded in another classloader

for the four read and writes tests. The DirectIOTests passes.

Thanks,

Brian
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