RFR(S) 8199924: Solaris: Correctly enqueue null arguments of attach operations (original) (raw)

David Holmes david.holmes at oracle.com
Wed Mar 21 22:23:45 UTC 2018

On 22/03/2018 12:51 AM, Daniel D. Daugherty wrote:

On 3/21/18 10:23 AM, Daniel D. Daugherty wrote:

On 3/21/18 10:00 AM, Langer, Christoph wrote:

Hi Dan,

that is, you mean the C-code? My original change? Hmmm... I think I confused myself before I drank enough coffee... Looking again... Okay I definitely confused myself... and I clearly don't remember the attach-on-demand code as well as I used to... sigh... I think you should keep your original fix since it now properly handles null arguments at the same attach-on-demand layer as the Linux code that you quoted. Handling this in args array processing would also be possible as David suggests, but it would bother me that Linux and Solaris lower attach-on-demand layers would have different behaviors.

They already do have completely different behaviours. Linux handles NULL at the Java layer by inserting empty strings!

David

Hope this is more clear.

Dan

Dan

Best regards Christoph -----Original Message----- From: Daniel D. Daugherty [mailto:daniel.daugherty at oracle.com] Sent: Mittwoch, 21. März 2018 14:59 To: Langer, Christoph <christoph.langer at sap.com>; David Holmes <david.holmes at oracle.com>; serviceability-dev at openjdk.java.net Subject: Re: RFR(S) 8199924: Solaris: Correctly enqueue null arguments of attach operations Hmmm... shouldn't the inconsistency in the Solaris backend also be addressed? Dan

On 3/21/18 8:45 AM, Langer, Christoph wrote: Hi David, thanks for looking at this. I currently have no emotions whether to fix it in C or in Java - I'll check it out... Best regards Christoph -----Original Message----- From: David Holmes [mailto:david.holmes at oracle.com] Sent: Mittwoch, 21. März 2018 10:20 To: Langer, Christoph <christoph.langer at sap.com>; serviceability- dev at openjdk.java.net Subject: Re: RFR(S) 8199924: Solaris: Correctly enqueue null arguments of attach operations Hi Christoph, On 21/03/2018 6:10 PM, Langer, Christoph wrote: Hi,

may I please ask for reviews of the following small fix. Webrev: http://cr.openjdk.java.net/~clanger/webrevs/8199924.0/ Bug: https://bugs.openjdk.java.net/browse/JDK-8199924 If one passes null arguments to the varargs of attach operations, they get swallowed on Solaris and following arguments will shift to lower positions. Other platform implementations handle this correctly, for instance linux: http://hg.openjdk.java.net/jdk/jdk/file/f6ad4d73c834/src/jdk.attach/linux/cl asses/sun/tools/attach/VirtualMachineImpl.java#l178 Wouldn't it be simpler to just handle this at the Java level and substitute "" for null in the args array? We're only looking at a maximum of three possible entries. Thanks, David Thanks Christoph

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