sendfile() in FileChannelImpl.c

[Michael Allman]

Can someone explain why we aren't using sendfile() in the transferTo0 call 
for the case of a file transfer to a network socket in FileChannelImpl.c?

Also, my understanding is that if this call cannot do a sendfile(), it 
should return IOS_UNSUPPORTED_CASE.  This will tell the caller to do a 
loop-based transfer (see sun.nio.ch.FileChannelImpl.transferTo(), line 
531).

Cheers,

Michael