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From "Oliver Deakin (JIRA)" <j...@apache.org>
Subject [jira] Resolved: (HARMONY-6315) [classlib][nio] FileChannel.map throws IOException when called with size 0
Date Wed, 16 Sep 2009 22:47:57 GMT

     [ https://issues.apache.org/jira/browse/HARMONY-6315?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel

Oliver Deakin resolved HARMONY-6315.

       Resolution: Fixed
    Fix Version/s: 5.0M12

Thanks Catherine - patch applied at repo revision r815994. Please check that the patch was
applied as expected.

> [classlib][nio] FileChannel.map throws IOException when called with size 0
> --------------------------------------------------------------------------
>                 Key: HARMONY-6315
>                 URL: https://issues.apache.org/jira/browse/HARMONY-6315
>             Project: Harmony
>          Issue Type: Bug
>          Components: Classlib
>         Environment: Unix
>            Reporter: Catherine Hope
>            Assignee: Oliver Deakin
>             Fix For: 6.0M1, 5.0M12
>         Attachments: 6315-patch.txt
> Creating a MappedByteBuffer by calling FileChannel.map with size 0 throws an IOException,
as the native call to mmap will fail with invalid argument when called with size 0.  Also
the IOException is thrown without any message from the Java after the native has returned
with -1, which isn't ideal.  On IBM and Sun Java a MappedByteBuffer is constructed with 0
> The stack trace of the error is:
> java.io.IOException: Call to mmap failed with error 22: Invalid argument
> 	at org.apache.harmony.luni.platform.OSMemory.mmap(OSMemory.java:547) /* after calling
OSMemoryLinux32.c which calls mmap */ 
> 	at org.apache.harmony.luni.platform.PlatformAddressFactory.allocMap(PlatformAddressFactory.java:37)
/* returns a PlatformAddress of where the map is */
> 	at org.apache.harmony.nio.internal.FileChannelImpl.mapImpl(FileChannelImpl.java:191)
/* creates PlatformAddress, which is passed to MappedByteBuffer constructor */
> 	at org.apache.harmony.nio.internal.ReadOnlyFileChannel.map(ReadOnlyFileChannel.java:89)
> 	at org.apache.harmony.nio.tests.java.nio.MappedByteBufferTest.testEmptyBuffer(MappedByteBufferTest.java:70)
> I think where to fix this is the native function, and return a dummy long address, as
the implementation of the MappedByteBuffer constructor (in my testcase this is a ReadOnlyDirectByteBuffer)
requires a PlatformAddress.

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