Проект OpenNet: MAN skb_dequeue (9) Ядро (FreeBSD и Linux)

Интерактивная система просмотра системных руководств (man-ов)

skb_dequeue (9)

>> skb_dequeue (9) ( Linux man: Ядро )

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.