kern/170203: [kern] piped dd' s don' t behave sanely when dealing with a fifo

[Garrett Cooper]

On Sat, Jul 28, 2012 at 7:56 PM, David Xu <listlog2011 at gmail.com> wrote:

...

> I have updated patch, the patch fixed lost-notification bug for select():
> http://people.freebsd.org/~davidxu/patch/fifopipe/kernel_pipe2.diff

    This patch prevents the hang from occurring on CURRENT / r238870
(it was missing a header definition in sys/pipe.h). Now all that
remains is chasing down why dd's records accounting is bogus.
    The attached patch makes the output somewhat more meaningful with
dd if it receives a SIGPIPE.
Thanks!
-Garrett

PS Fedora 17 does what I expect by reporting the actual number of
records transferred across the fifo.
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