SKB_DEQUEUE
Section: Networking Functions (9)
Updated: November 24, 1997
Page Index
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_ counterparts. 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 wrapper functionality in addition to performing their specific tasks.
AVAILABILITY
Linux 1.0+
SEE ALSO
intro(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>