Hi, In 2.6.27 f_acm.c, gserial_disconnect() is called when the ACM ttygsX is reset. This has the effect of closing the TTY interface when for example the USB cable is unplugged. Hence my userspace program that was listening to ttygsX gets disconnected from ttygsX. How can my userspace program know when ttygsX is reconnected (eg. when the USB cable is replugged), so it in turn can reconnect to ttygsX? Perhaps the ACM CDC driver has some sort of way of notifying userspace programs? Cheers, Daniel -- 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