How to specity the -agentlib option in a jtreg test?

[Staffan Larsen]

> On 18 apr. 2016, at 21:59, Jonathan Gibbons <jonathan.gibbons at oracle.com> wrote:
> 
> HI Staffan,
> 
> The text specifically describes Windows and Solaris.   Should we assume that Mac and Linux also use LD_LIBRARY_PATH.

As David said, Mac uses DYLD_LIBRARY_PATH.

> And, my question still stands:  which is the better one to fix: jtreg, or jvmti?

I think the fix needs to be in jtreg.

/Staffan

> 
> -- Jon
> 
> On 04/18/2016 11:07 AM, Staffan Larsen wrote:
>> The JVMTI spec is kind of vague on this point, but does not mention system properties.
>> 
>> -agentlib:<agent-lib-name>=<options>
>> The name following -agentlib: is the name of the library to load. Lookup of the library, both its full name and location, proceeds in a platform-specific manner. Typically, the <agent-lib-name> is expanded to an operating system specific file name. The <options> will be passed to the agent on start-up. For example, if the option -agentlib:foo=opt1,opt2 is specified, the VM will attempt to load the shared library foo.dllfrom the system PATH under WindowsTM or libfoo.so from the LD_LIBRARY_PATH under the SolarisTM operating environment. If the agent library is statically linked into the executable then no actual loading takes place.
>> 
>> http://docs.oracle.com/javase/8/docs/platform/jvmti/jvmti.html <http://docs.oracle.com/javase/8/docs/platform/jvmti/jvmti.html>
>> 
>> 
>> 
>>> On 18 apr. 2016, at 19:51, Jonathan Gibbons <jonathan.gibbons at oracle.com <mailto:jonathan.gibbons at oracle.com>> wrote:
>>> 
>>> OK, thanks for clarifying.
>>> 
>>> The question is, should -agentlib use the system property (that is already being set) or should jtreg set LD_LIBRARY_PATH (which is platform specific.)
>>> 
>>> -- Jon
>>> 
>>> On 04/18/2016 04:53 AM, Alexander Kulyakhtin wrote:
>>>> Jon,
>>>> 
>>>> In the 'rerun' section I have:
>>>> 
>>>> images/jdk/bin/java \\
>>>> ...
>>>> -Dtest.nativepath=<...>images/test/hotspot/jtreg/native
>>>> -Djava.library.path=<...>images/test/hotspot/jtreg/native
>>>> -agentlib:TestGetModules
>>>> ...
>>>> 
>>>> While TestGetModules.so does reside in the images/test/hotspot/jtreg/native, jtreg does not set LD_LIBRARY_PATH to that directory before invoking java.
>>>> Therefore -agentlib does not know where to look for the library.
>>>> The System.loadLibrary, on the contrary, does succeed because of the -Djava.library.path passed to java.
>>>> 
>>>> Best regards,
>>>> Alexander
>>>> 
>>>> ----- Original Message -----
>>>> From: jonathan.gibbons at oracle.com <mailto:jonathan.gibbons at oracle.com>
>>>> To: jtreg-use at openjdk.java.net <mailto:jtreg-use at openjdk.java.net>
>>>> Sent: Friday, April 15, 2016 7:05:18 PM GMT +03:00 Iraq
>>>> Subject: Re: How to specity the -agentlib option in a jtreg test?
>>>> 
>>>> jtreg should report the command it is trying to execute in the "rerun"
>>>> section.
>>>> 
>>>> If you execute that command directly, does it work?   In other words,
>>>> can you isolate the problem to jtreg or to the execution of the command
>>>> that jtreg execs?
>>>> 
>>>> -- Jon
>>>> 
>>>> On 04/15/2016 07:53 AM, Staffan Larsen wrote:
>>>>> I don’t know why it does not work for -agentlib, but as a workaround you can create an @driver class that launches your test program with the -agentpath parameter and get the location of the native libraries through the system property test.nativepath.
>>>>> 
>>>>> Staffan
>>>>> 
>>>>>> On 15 apr. 2016, at 16:29, Alexander Kulyakhtin <alexander.kulyakhtin at oracle.com <mailto:alexander.kulyakhtin at oracle.com>> wrote:
>>>>>> 
>>>>>> Hi,
>>>>>> 
>>>>>> I'm trying to create a jtreg test which compiles and then executes a java class with the -agentlib option (to test some JVMTI functionality)
>>>>>> 
>>>>>> In my test I have
>>>>>> 
>>>>>> @compile MyTest.java
>>>>>> @run main/othervm -agentlib:mylib MyTest
>>>>>> 
>>>>>> I run the test with:
>>>>>> 
>>>>>> jtreg -nativepath:<path to libmylib.so> MyTest
>>>>>> 
>>>>>> However, it fails with:
>>>>>> 
>>>>>> "Could not find agent library mylib on the library path, libmylib.so: cannot open shared object file: No such file or directory"
>>>>>> 
>>>>>> The -nativepath does provide for the successful loading of the library when I use System.loadLibrary("mylib").
>>>>>> However, for the -agentlib option, it does not help.
>>>>>> 
>>>>>> Does someone know if it is possible to specify the library path for the -agentlib option, from within a jtreg test or using the jtreg options?
>>>>>> 
>>>>>> Thank you very much for your help.
>>>>>> 
>>>>>> Best regards,
>>>>>> Alexander
>>>>>> 
>>> 
>> 
> 

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