Hi Iam trying to implement a system call as a module . In the user program iam defining the address of the system call as #define __NR_my_call (__NR_SYSCALL_BASE + 226) when the program is compiled it gives __NR_SYSCALL_BASE: undefined varibale. I have included the header file /usr/src/linux/include/asm-arm/unistd.h could someone help me in solving this error?? thanks! Charumathi . You Can If U think U Can _________________________________________________________________ MSN Photos is the easiest way to share and print your photos: http://photos.msn.com/support/worldwide.aspx -- Kernelnewbies: Help each other learn about the Linux kernel. Archive: http://mail.nl.linux.org/kernelnewbies/ FAQ: http://kernelnewbies.org/faq/