RFR: 8291067: macOS should use O_CLOEXEC instead of FD_CLOEXEC [v4]

[Gerard Ziemski]

On Wed, 16 Nov 2022 20:05:16 GMT, Daniel D. Daugherty <dcubed at openjdk.org> wrote:

>> Gerard Ziemski has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   create our own test file, to guarantee it will exist
>
> test/hotspot/gtest/runtime/test_os.cpp line 893:
> 
>> 891: TEST_VM(os, open_O_CLOEXEC) {
>> 892: #if !defined(_WIN32)
>> 893:   int err = system("touch test.txt"); // create the "test.txt" file
> 
> Where will the new test file get created and what will clean it up?
> If it's created in the JTREG scratch dir, then I believe it is cleaned
> up automatically.

On Mach5 it would be created here:

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PR: https://git.openjdk.org/jdk/pull/9663