8352392: AIX: implement attach API v2 and streaming output

[varada1110]

AIX changes for attach API to support arbitrary length arguments and the streaming output support.
serviceability/attach/AttachAPIv2/StreamingOutputTest.java test passes

tier1, tier2 and tier3 testing is successful with fastdebug level

JBS Issue : JDK-8352392

---

Progress

• Change must be properly reviewed (1 review required, with at least 1 Reviewer)
• Change must not contain extraneous whitespace
• Commit message must refer to an issue

Issue

• JDK-8352392: AIX: implement attach API v2 and streaming output (Enhancement - P4)

Reviewing

Using git

Checkout this PR locally:
$ git fetch https://git.openjdk.org/jdk.git pull/24177/head:pull/24177
$ git checkout pull/24177

Update a local copy of the PR:
$ git checkout pull/24177
$ git pull https://git.openjdk.org/jdk.git pull/24177/head

Using Skara CLI tools

Checkout this PR locally:
$ git pr checkout 24177

View PR using the GUI difftool:
$ git pr show -t 24177

Using diff file

Download this PR as a diff file:
https://git.openjdk.org/jdk/pull/24177.diff

Using Webrev

Link to Webrev Comment

[bridgekeeper]

👋 Welcome back varadam! A progress list of the required criteria for merging this PR into master will be added to the body of your pull request. There are additional pull request commands available for use with this pull request.

[openjdk]

❗ This change is not yet ready to be integrated.
See the Progress checklist in the description for automated requirements.

[openjdk]

@varada1110 The following labels will be automatically applied to this pull request:

• hotspot-runtime
• serviceability

When this pull request is ready to be reviewed, an "RFR" email will be sent to the corresponding mailing lists. If you would like to change these labels, use the /label pull request command.

[mlbridge]

Webrevs

• 00: Full (8efd253f)

[JoKern65]

Hi Varada, it looks to me that with your change you've brought the AIX code closer to the POSIX implementation, but not completely. Could you please explain your changes in detail so I can review the PR? I'm not that familiar with this.