[Bug 197309] ggatec has been broken since rev 238119

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=197309

            Bug ID: 197309
           Summary: ggatec has been broken since rev 238119
           Product: Base System
           Version: 10.0-RELEASE
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: kern
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: ota at j.email.ne.jp

Created attachment 152537
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=152537&action=edit
Easy work arond to unbreak ggatec <-> ggated but break HAST

ggated disconnects ggatec connections immediately.

The server side prints "ioctl(/dev/ggctl): Invalid argument."

https://svnweb.freebsd.org/base?view=revision&revision=238119 looks to be the
cause.

The server side expects gctl_readprov[] to be filled with geom provider but
ggatec does not pass such argument.

10.0 RELEASE and thereafter seem to be affected by this.

The attached patch allows ggatec and ggated to communicate again but as the
change mention HAST and I don't know how it really works and never used it, the
patch may break HAST.

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