On Fri, Sep 11, 2015 at 04:54:13PM -0700, David Grayson wrote: > Hello. > > In Linux, there seems to be a period of time when a newly-connected > USB device will be detectable by libudev, but the udev rules governing > its permissions have not been applied. This is a problem for me > because I want to write user-mode software that waits for a USB device > to appear, and then opens a handle to it and performs I/O. If I > connect too early, I will end up getting a permission error. > Specifically, I will get the EACCES error when I call open() on the > USB device node (e.g. /dev/bus/usb/006/041). What is the best way to > solve this problem? Is there any way to ask the system whether all of > the udev rules have been applied for a particular device? Can't you wait for libudev to notify your application when the usb device is attached? That should happen after the normal rules are run. Have you tried that? thanks, greg k-h -- 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
