SKB_DEQUEUE(9) Networking Functions SKB_DEQUEUE(9)NAME
__skb_dequeue, skb_dequeue - remove an sk_buff from the head of a list
SYNOPSIS
#include <linux/skbuff.h>
struct sk_buff *__skb_dequeue(struct sk_buff_head *list);
struct sk_buff *skb_dequeue(struct sk_buff_head *list);
DESCRIPTION
The skb_dequeue function removes the head element of an sk_buff_head.
It decrements the list qlen pointer, and cleanly detaches the head from
the queue. This function should be used instead of performing this
task manually, as it provides a clean, standardized way of manipulating
an sk_buff_head, and provides interrupt disabling (see NOTES below.)
RETURN VALUE
Returns a pointer to the head element of list, or NULL if list is
empty.
NOTES
It is important to note the difference between not only __skb_dequeue
and skb_dequeue, but all the __skb_ functions and their skb_ counter‐
parts. Essentially, the __skb_ functions are non-atomic, and should
only be used with interrupts disabled. As a convenience, the skb_
functions are provided, which perform interrupt disable / enable wrap‐
per functionality in addition to performing their specific tasks.
AVAILABILITY
Linux 1.0+
SEE ALSOintro(9), skb_unlink(9), skb_insert(9), skb_queue_head(9),
skb_queue_tail(9)
/usr/src/linux/net/netlink.c /usr/src/linux/net/ax25/af_ax25.c
/usr/src/linux/net/core/datagram.c /usr/src/linux/net/ipv4/ipmr.c
/usr/src/linux/net/ipv4/tcp.c
AUTHOR
Cyrus Durgin <cider@speakeasy.org>
Linux DDI November 24, 1997 SKB_DEQUEUE(9)
