title: Is it possible to add a system call via a LKM?
body: <p>I'd like to add a new system call via an LKM, but I'm not sure how to do this. That is, I know that if I want to add a completely new system call, I can look through the sys_call_table and find a <code>sys_ni_syscall</code> and just replace it, but I was curious if it was possible to actually <strong>add</strong> to the <code>sys_call_table</code>. I realize it's probably <strong>not</strong> possible, given that it's a fixed size array, but I was wondering if there were any other clever ways to add system calls without overriding an unused system call number.</p>