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I already posted this question on Stack overflow, but no luck there: http://stackoverflow.com/questions/14784525/dereferencing-pointer-to-incomplete-type-in-compiling-freebsd-custom-system-caF

I am getting compilation error when I compile this code:

#include <sys/param.h> 
#include <sys/system.h>

struct syshello_args 
{
   char *buf;
};

int sys_myhello(p, uap)
struct proc* p; struct syshello_args* uap;
{
   sprintf(uap->buf, "Hello");
   p->p_retval[0]=0;
   return 0;
}

I am getting many errors:

I am not familiar with C language at all. I found this example in a couple of tutorials but it doesn't work for me. Can anyone help me fixing the error.

Thank you

share|improve this question
This is a plain C question, it does belong on Stack Overflow, not here. But as you were already told over there, find another tutorial. That's ancient C style. – Mat Feb 9 at 15:09
It looks like struct proc isn't defined. You are probably missing an #include line (or, as @Mat hints, you are following an ancient tutorial on a new system, where things are done differently). – vonbrand Feb 9 at 15:37

closed as off topic by Mat, rahmu, Renan, jasonwryan, Shadur Feb 9 at 20:59

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