skb_unshare — make a copy of a shared buffer
struct sk_buff * skb_unshare ( | struct sk_buff * skb, |
gfp_t pri); |
If the socket buffer is a clone then this function creates a new
copy of the data, drops a reference count on the old copy and returns
the new copy with the reference count at 1. If the buffer is not a clone
the original buffer is returned. When called with a spinlock held or
from interrupt state pri must be GFP_ATOMIC
NULL is returned on a memory allocation failure.