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From "Catherine Hope (JIRA)" <j...@apache.org>
Subject [jira] Created: (HARMONY-6315) [classlib][nio] FileChannel.map throws IOException when called with size 0
Date Mon, 24 Aug 2009 09:11:59 GMT
[classlib][nio] FileChannel.map throws IOException when called with size 0
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                 Key: HARMONY-6315
                 URL: https://issues.apache.org/jira/browse/HARMONY-6315
             Project: Harmony
          Issue Type: Bug
          Components: Classlib
         Environment: Unix
            Reporter: Catherine Hope


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
capacity.

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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