centos man page for skb_share_check

SKB_SHARE_CHECK(9)						 Linux Networking						SKB_SHARE_CHECK(9)

NAME
       skb_share_check - check if buffer is shared and if so clone it

SYNOPSIS
       struct sk_buff * skb_share_check(struct sk_buff * skb, gfp_t pri);

ARGUMENTS
       skb
	   buffer to check

       pri
	   priority for memory allocation

DESCRIPTION
       If the buffer is shared the buffer is cloned and the old copy drops a reference. A new clone with a single reference is returned. If the
       buffer is not shared the original buffer is returned. When being called from interrupt status or with spinlocks held pri must be
       GFP_ATOMIC.

       NULL is returned on a memory allocation failure.

COPYRIGHT
Kernel Hackers Manual 3.10					     June 2014							SKB_SHARE_CHECK(9)