Find the answer to your Linux question:
Results 1 to 2 of 2
Hi, I have a requirement to use a freeware linux user mode library for data processing. The input data is purely in kernel space and we are finding it very ...
Enjoy an ad free experience by logging in. Not a member yet? Register.
  1. #1
    Just Joined!
    Join Date
    May 2011
    Posts
    1

    user mode callback from kernel


    Hi,
    I have a requirement to use a freeware linux user mode library for data processing.
    The input data is purely in kernel space and we are finding it very difficult to port
    whole freeware community based project to build under linux kernel build system !

    So normally the requirement is to make a callback from kernel to user mode,
    call user mode lib and let it process input data
    return back to kernel mode and signal the consumer.
    Is it possible to achieve kernel to user mode callback ?
    Or
    If it's not possible, then I have another idea to create a user mode thread making kernel calls (ioctl),
    which initially blocked, being signalled when there is sufficient data. Come back to user mode,
    process data in user mode, make an ioctl call, switch to kernel mode,
    unblock consumer.
    But the second scheme will be costlier and include 2 context switch and also difficult
    to adapt in our enviornment.

    Your suggestions will be very helpful.

    Many Thanks

  2. #2
    Just Joined!
    Join Date
    Feb 2010
    Posts
    2

    What about a kernel module?

    I don't have experience in kernel programming, but what if you program a kernel module so you can export the kernel data to a file, then with program running in user mode just read the file, poling or with select().

    Sorry if I'm peeing outside the can....

    Ernesto.

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •