My company, DEY Storage Systems , is in the process of creating a new product around the illumos operating system. As you might imagine, this product includes a variety of open and proprietary source code. The product itself is not delivered as a separate executable, but as a complete product. We don't permit our customers to crack it open, both from the sense of protecting our IP, but also to protect our support and release engineering organizations -- our software releases consist only of a single file and we don't supply tools or source for other parties to modify that file. One of the pieces that we wanted to integrate into the tree is an excellent little piece of software called Zookeeper , produced by the Apache organization. Like illumos, Zookeeper has a nice non-viral copyleft license, which makes it nice for integration into our product. However, I discovered that as part of our integration, one of my engineers had decided to integrate GNU grep. Why? Becaus
modunload -i "id of qfe"
cp /kernel/drv/sparcv9/hme /kernel/drv/sparcv9/qfe
now qfe seems to work with GLDv3 features.
But, yes, qfe is nearly 100% the same code as hme, and mostly the qfe changes just make it work by directly calling into the hme driver. (There are packaging changes, of course.)