Messages in this thread |  | | Date | Tue, 18 Feb 2003 08:44:52 -0500 (EST) | From | "Richard B. Johnson" <> | Subject | Re: Help !! calling function in module from a user program |
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On Tue, 18 Feb 2003, Sudharsan Vijayaraghavan wrote:
> Hi, > > Am a new bee to linux internals. > I am trying to make a simple program witch will call a function from a > module. I made a module compiled it and INSMOD-it into kernel, that works > fine. I would like to call from my user program a function defined in my > kernel module. > > Please suggest any method thro' which this could be accomplished. > The only way i did it was by running my new module as insmod mymodule.o and > get my job done. > > Thanks, > Sudharsan.
Unix/Linux uses open() close() read() write() and ioctl() (plus a few others) to interface with modules or any kind of driver. To 'call' some module function from user-mode, you impliment open() and close(). That will provide a file-descriptor for subsequent operations. Then you impliment either read() write() or ioctl() or all, whichever is most appropriate for the function your module is going to provide.
You never 'call' a kernel function directly from user-mode. One of the kernel's primary functions is to make this impossible. Kernel code is protected from direct user-mode access.
Cheers, Dick Johnson Penguin : Linux version 2.4.18 on an i686 machine (797.90 BogoMips). Why is the government concerned about the lunatic fringe? Think about it.
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