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    SubjectRe: Adding checkpointing API to Linux kernel
    Hi Pavel,

    > PS: How many things would break if we forced ioctls to _always_ pass
    >
    > struct foo {
    > int len;
    > char data[len];
    > } ?

    Everything would break. Remember that lots of programs use terminal
    control ioctls.

    So far I've seen two design ideas. One is an new 'nioctl' system call
    which takes 'len' as a fourth parameter. The other is to add
    'ioctl_register' and 'ioctl_unregister' to the kernel, so that the
    kernel knows this information and can export it, even though the
    information is not present in the API.

    Michael

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