Date: Wed, 7 Jul 2004 17:55:24 -0700 (PDT) From: pradeep reddy punnam <prady_p@yahoo.com> To: freebsd-hackers@freebsd.org Subject: unable to copy data from the kernel to the user space Message-ID: <20040708005524.19141.qmail@web53407.mail.yahoo.com>
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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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