System calls in user and kernel space

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Hi,

I am writing new system calls for a security project, and I was wondering if there is any way to specify whether they will be accessible from user space or kernel space. Basically, I am writing a monitor that writes to a buffer, and I would like to be able to use this both in the programs I write (running in user space) as well as in kernel space. I have successfully used this syscall in kernel space, but whenever I try to use it in a C program, I get a compile error that says "Undefined reference ...".

Thanks,

Jug

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