bsd implementation of Java_sun_nio_ch_FileChannelImpl_transferTo0 ignores "count" argument

[Michael Allman]

There's a bug in the bsd patch to FileChannelImpl.c, as described in the 
subject of this message.  FYI, I have verified this using the "current" 
jdk16 freebsd patchset found here:

http://www.eyesbeyond.com/freebsddom/java/JDK16JRLConfirm.html

I haven't fully analyzed the impact of this defect.  I can say that in my 
case, if I call FileChannel.transferTo(0, 100, socketChannel), where 100 
is less than the length of the file in question, it transfers the entire 
file to the destination.  According to the docs for this method, it should 
only transfer a maximum of 100 bytes.  This is key to my particular usage 
of this method.

I can attempt to provide a patch, but C is not my thing, and I could not 
make a reliable claim as to the correctness of my patch.  Also, there's 
the whole license issue.  Fixing this seems simple enough, though.  I 
would like to help insofar as I can.

Also, I know this is getting pushy, but it seems like fixing this issue 
would be a great time to replace the current implementation of this method 
with a true bsd sendfile() call.  I could give that a try, too.

Cheers,

Michael

(CC'ing Landon Fuller because this is a bug in Soylatte, too)