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572742b376
Make the result of alcove_cgroup:set/6 more consistent:
* return ok on success
* return an errno tuple if open() or write() fails
* return {error,enoent} if the cgroup does not exist, instead of []
In the case of a partial write, currently the code will crash, taking
care to close the fd in the unix child process first. The code could
select on the fd and attempt another write.