DESCRIPTION

     skb_insert and skb_append are essentially wrapper  functions
     for  __skb_insert  (see NOTES, below.)  __skb_insert inserts
     newsk into list, and resets the appropriate  next  and  prev
     pointers.   prev  and  next are used to frame newsk in list.
     After  setting  the  next  and  prev  pointers   in   newsk,
     __skb_insert  sets  the  prev  pointer  in next and the next
     pointer in prev, sets the list pointer in newsk, and  incre-
     ments the qlen counter in list.

     skb_insert and skb_append should be used to add sk_buffs  to
     a  list  rather than performing this task manually; in addi-
     tion to performing this task in a  standardized  way,  these
     functions  also provide for interrupt diasabling and prevent
     list mangling.  Both of these functions use the list pointer
     in old to determine to which list newsk should be attached.

     The skb_insert function adds newsk to the list before old.

     The skb_append function adds newsk to the list after old.

RETURN VALUE

     None.

NOTES

     It is important to note  the  difference  between  not  only
     skb_insert,  skb_append and __skb_insert, but all the __skb_
     functions and their  skb_  counterparts.   Essentially,  the
     __skb_  functions  are  non-atomic,  and should only be used
     with interrupts disabled.  As a convenience, the skb_  func-
     tions are provided, which perform interrupt disable / enable
     wrapper  functionality  in  addition  to  performing   their
     specific tasks.

AVAILABILITY

     Linux 1.0+

SEE ALSO

     intro(9), skb_queue_head(9), skb_queue_tail(9)

     /usr/src/linux/net/ax25/af_ax25.c
     /usr/src/linux/net/core/skbuff.c
     /usr/src/linux/net/ipv4/tcp_input.c
     /usr/src/linux/net/netrom/nr_in.c

AUTHOR

     Cyrus Durgin <cider@speakeasy.org>