[Bug 227342] [dpv] dpv -x is broken

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=227342

            Bug ID: 227342
           Summary: [dpv] dpv -x is broken
           Product: Base System
           Version: 11.1-STABLE
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: bin
          Assignee: dteske at FreeBSD.org
          Reporter: eugen at freebsd.org
                CC: stable at FreeBSD.org

An example from dpv(1) manual page does not work:

tar cf - . | dpv -x "gzip -9 > out.tgz" \
                   $( du -s . | awk '{print $1 * 1024}' ):label

In fact, even simplier command cannot work: dd if=/dev/zero bs=10000 count=1 |
dpv -x "cat >/dev/null" 10000:label

It just draws initial dialog then sits doing nothing.

The reason is that dpv(3) library uses posix_spawn_file_actions_adddup2()
function that effectively clobbers standard input file handle with a call to
dup2(terminal, 0) and ktrace(1) assures that.

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