Re: Cygwin: Implement sched_[gs]etaffinity() commit breaks RTEMS port

[Eric Blake <eblake at redhat dot com>]

On 6/28/19 7:57 PM, Mark Geisert wrote:

> 
> Please forgive my ignorance of licensing details...  Are we allowed to
> copy GNU library source into Cygwin?

Cygwin is a different beast (it has GPL code, but still tries to avoid
wholesale imports from glibc, preferring to copy from BSD where
possible).  But you asked a question on the newlib list, and here the
answer is a definitive now - newlib cannot include [L]GPL code, so
copying from glibc is forbidden.

>  Or is re-implementation from
> documentation the way to go?

Correct, unless you can find an existing BSD implementation with
appropriate semantics to copy.

>  In either case, must the glibc file
> organization be followed or is platform-specific rejiggering acceptable?

The more you copy glibc's layout, the more questionable it is on whether
you did inappropriate copying. What matters more is getting something
that implements the right semantics.

> 
> I'd like to just add the CPU_SET macros to Cygwin's new sys/cpuset.h and
> any needed support code to our sched.cc but am willing to hear other
> options.
> Thanks,
> 
> ..mark
> 

-- 
Eric Blake, Principal Software Engineer
Red Hat, Inc.           +1-919-301-3226
Virtualization:  qemu.org | libvirt.org

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