Sorry for the multiple posts, am thinking about this problem
in between working on other stuff... and stuff comes up.
But bottom line -- I would look at the source of coreutils "dd" program
and find out how they do direct I/O. I know they had to deal with
alignment issues when the Linux kernel b
In thinking about this some more, you probably
want to limit your O_DIRECT to just opens on files --
not sockets.
I think that might be the cause of the error I got.
The other stuff may still apply, but may be OS dependent.
It doesn't look like it is real easy to tell in the
open routine where
