[Bug 224011] kevent fails on cuse(3) devices

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=224011

            Bug ID: 224011
           Summary: kevent fails on cuse(3) devices
           Product: Base System
           Version: 11.0-STABLE
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: yuri at freebsd.org

kevent fails on /dev/video0 (created through cuse(3) by webcamd).

The below testcase fails:
> QKqueueFileSystemWatcherEngine::addPaths: kevent: Invalid argument


Qt-styled testcase:

> #include <QFileSystemWatcher>
> #include <QThread>
> 
> class T : public QThread {
> public:
>   void run() {
>     auto m_fsWatcher = new QFileSystemWatcher({"/dev"}, nullptr);
>     QStringList paths;
>     paths.push_back("/dev/video0");
>     m_fsWatcher->addPaths(paths);
>   }
> };
> 
> int main(int argc, char* argv[]) {
>   T t;
>   t.start();
>   t.wait();
> }

> c++ -std=c++11 -fPIC -o testcase -I/usr/local/include/qt5/QtCore -I/usr/local/include/qt5 testcase.cpp  -L/usr/local/lib/qt5/ -lQt5Core

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