I'm looking for a way to have a driver notify a user-mode process or thread that an event has occurred. It looked like eventfd() could be useful but it doesn't look like eventfd_signal() is exported to modules. So I'm not exactly sure what eventfd was intended for. Another option might be to send a process a signal with send_sig() but then I'd have to resort to some other trickery so the process could figure out which device triggered the event, and which event from the device was triggered. So none of the methods I've found seem ideal for what I want to do. My device has multiple high speed I/O channels that will likely be mmapped to user-mode for zero-copy data transfers. I'd like a way to send events to the user-mode process to indicate things like an acquisition has started/stopped, N samples have arrived, etc. Am I missing some options, or are there better ways to do this? -- Shawn -- To unsubscribe from this list: send an email with "unsubscribe kernelnewbies" to ecartis@xxxxxxxxxxxx Please read the FAQ at http://kernelnewbies.org/FAQ
