RFR (XS): 8193105: Print error code when map_memory_to_file() fails

[David Holmes]

Hi Sangheon,

On 6/12/2017 5:46 PM, sangheon.kim wrote:
> Hi all,
> 
> Could I have some reviews for this change?
> 
> JDK-8190308 (Implementation: JEP 316: Heap Allocation on Alternative 
> Memory Devices) introduced a new test(TestAllocateHeapAt.java) but it is 
> failing on Solaris-Sparc with fastdebug build. But unfortunately there's 
> no error print when related function fails.
> 
> This proposal is simply adding error code print for further 
> investigation of JDK-8192871(TestAllocateHeapAt fails), not change its 
> logic.
> 
> CR: https://bugs.openjdk.java.net/browse/JDK-8193105
> Webrev: http://cr.openjdk.java.net/~sangheki/8193105/webrev.0
> Testing: hs-tier1

!     vm_exit_during_initialization(err_msg("Error in mapping Java heap 
at the given filesystem directory. error(%d)", ret));

You should use strerror(ret) to print a readable error string here.

Thanks,
David

> Thanks,
> Sangheon