[Bug 82841] sendfile doesn't work with O_APPEND

[bugzilla-daemon-590EEB7GvNiWaY/ihj7yzEB+6BGkLq7r@public.gmane.org]

https://bugzilla.kernel.org/show_bug.cgi?id=82841

--- Comment #2 from Jason Newton <nevion-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> ---
(In reply to Alan from comment #1)
> O_APPEND is not supported for sendfile().
> 
> It's documented in the splice() manual page but not for sendfile so I've
> moved this to a documentation bug

OK so this quirk was not out in the open in documentation - before I opened
this bug report I read a few years old discussion:
http://fixunix.com/kernel/543017-splice-vs-o_append.html

Most of what they're talking about is splice, not sendfile.  They might use the
same implementation but sendfile should be O_APPEND safe as there is no
specifiable offset in the output filedescriptor.  Is there a reason to not
support it?

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