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>


 

Index

NAME
SYNOPSIS
DESCRIPTION
RETURN VALUE
NOTES
AVAILABILITY
SEE ALSO
AUTHOR
LinuxReviews : manual page archive : man9