On Wed, 25 May 2011, Arvid Brodin wrote: > Hi, > > What's the best way to get a notification in user space when an overcurrent > event occurs on a usb port? The idea is to let a user application notify the > user that something is wrong. > > When a usb port is short-circuited (or otherwise over-loaded), a message like > this is sent to the system log: > > hub 1-1:1.0: over-current change on port 3 > > So one solution would be to create a chain of pipes, running something like > 'tail -f /var/log/messages | egrep "hub.*over-current change"' and read the > output from this in the program. Is there a better way (some kind of sysfs > interface for port power state, maybe)? The port status information is not exported to userspace in any way other than the kernel log. Alan Stern -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
