Hi, I am writing a character driver.And I am implementing the ioctl call for that.I need to select the unique magic number of ioctl.And when i see ioctl-numbers.txt that was given in the documentation all the letters are reserved.So,How can i select unique magic number? I am using fedora core 4 and linux kernel 2.6.11-1.1369_FC4 version. thanks in advance. raja -- Kernelnewbies: Help each other learn about the Linux kernel. Archive: http://mail.nl.linux.org/kernelnewbies/ FAQ: http://kernelnewbies.org/faq/