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how to use mknod in LKM's

hai,
    I tried mknod( ) inside an LKM,but it needs
    "/usr/include header files, which is not preferred, I hope . 
    I turned to use sys_mknod( ) in 
        "/lib/modules/`uname -r`/build/include/linux/syscalls.h". 
    When I tried to compile the LKM, it raised a warning
    " implicit declaration of function sys_mknod "

    Can any one suggest how to create a device in an LKM.
    Thanks in advance.

- kishore, packetware.



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