> >> for example,what if out_fd is a non block I/O?
>
> > sendfile sends as many data as possible without blocking. After that,
> > it returns `EWOULDBLOCK'.
>
> Are you very sure? Last time I checked, it didn't. (Granted, this was by
> looking at the code).
I've only looked at the code, too. :-/ I won't say that you are wrong
(despite your k3wl `root' local-part ;), but you might want to have
a look at file_send_actor(). The call on file->f_op->write() can return
-EWOULDBLOCK, and an error is passed to the calling function.
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