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Error in code, old C style

Hello everyone.
I am trying to build a custom call in FreeBSD 4.2 just as a proof of concept. I have no idea about C. Can anybody help me fixing these errors.


struct syshello_args
char *buf;

int sys_myhello(p, uap)
struct proc* p; struct syshello_args* uap;
sprintf(uap->buf, "Hello");
return 0;

Thank you
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