Hi gentlemen, Nice to see you. Here is my situation: I have a program chang-lids, i want it to be run when the following two conditions comes true, (1) "/dev/ttyAS1" created. (2) "/dev/mcuserv.0" created. Here is what i did: 1) put the change-lids into /lib/udev 2) creat a file /etc/udev/rules.d/75-smcu. rules which contains: ACTION=="add", KERNEL=="mcuserv.0", RUN+="/lib/udev/change-lids" I found that the "/dev/ttyAS1" has not been created, when the change-lids was called, so change-lids failed when trying to open the "/dev/ttyAS1" with a new line discipline. Does anyone have a good suggestion about this issue? Thanks in advance! Jerry -- To unsubscribe from this list: send the line "unsubscribe linux-hotplug" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html