I'm doing some work on a SONET PHY and I was wondering what the recommended
method is for asynchronously reporting events to userspace.
I have some non-critical events (correctable ecc errors, etc) that I poll every
once in a while, but there are some critical events (loss of signal, for
instance) that I want to report immediately.
What is the usual way of doing this? I see three possibilities: 1) the
userspace app could register its pid with the driver using ioctl() and on a
fault the interrupt handler in the driver could fire off a signal to the
registered pids to alert them that something happened, at which point they do
another ioctl() to find out exactly what it was, 2) use netlink to provide a
socket-based notification of what happened, 3) provide a file descriptor that
becomes readable when an event happens.
What's the Right Thing to do here?
Thanks,
Chris
-- Chris Friesen | MailStop: 043/33/F10 Nortel Networks | work: (613) 765-0557 3500 Carling Avenue | fax: (613) 765-2986 Nepean, ON K2H 8E9 Canada | email: cfriesen@nortelnetworks.com - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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