Moved: This thread is more suitable in Programming and has been moved accordingly to help your thread/question get the exposure it deserves.
I don't know Minix code, but I can tell you from Linux/BSD experience. I bet the solution is the same. When you run such call from user space, you run software interrupt and then the handler (in the system) redirects it to the right place. Search for system_call or similar functions. In general, you should be able to find it somewhere where interrupt handlers are set.
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