unable to copy data from the kernel to the user space

[pradeep reddy punnam]

hi hackers,
 
i am new to kernel hacking , i am just trying to play with the networking code.
i wrote a system call that will copy the mbuf address from the kernel to user space..
the sys call look like this
 
355  STD BSD  { int sn_rqueue(struct mbuf *m);}
 
and the code  in the sn_rqueue syscall look like 
struct mbuf *x;
copyout(x,uap->m;sizeof(x));
 
and the code in the user program look like 
struct mbuf *m=NULL;
syscall(355,m);
 
and when i tryed to read the ' m ' value it still stays as NULL,
may be this question is trivial for u guys..but i was struck at this point...
i will be very thankful if somebody can help in this...
 
 
-prady
 
 
 

		
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