SKB_PEEK_TAIL(9) Linux Networking SKB_PEEK_TAIL(9)NAME
skb_peek_tail - peek at the tail of an sk_buff_head
struct sk_buff * skb_peek_tail(const struct sk_buff_head * list_);
list to peek at
Peek an sk_buff. Unlike most other operations you _MUST_ be careful with this one. A peek leaves the buffer on the list and someone else
may run off with it. You must hold the appropriate locks or have a private queue to do this.
Returns NULL for an empty list or a pointer to the tail element. The reference count is not incremented and the reference is therefore
volatile. Use with caution.
COPYRIGHT Kernel Hackers Manual 3.10 June 2014 SKB_PEEK_TAIL(9)
Check Out this Related Man Page
__SKB_RECV_DATAGRAM(9) Linux Networking __SKB_RECV_DATAGRAM(9)NAME
__skb_recv_datagram - Receive a datagram skbuff
struct sk_buff * __skb_recv_datagram(struct sock * sk, unsigned int flags, int * peeked, int * off, int * err);
returns non-zero if this packet has been seen before
an offset in bytes to peek skb from. Returns an offset within an skb where data actually starts
error code returned
Get a datagram skbuff, understands the peeking, nonblocking wakeups and possible races. This replaces identical code in packet, raw and
udp, as well as the IPX AX.25 and Appletalk. It also finally fixes the long standing peek and read race for datagram sockets. If you alter
this routine remember it must be re-entrant.
This function will lock the socket if a skb is returned, so the caller needs to unlock the socket in that case (usually by calling
* It does not lock socket since today. This function is * free of race conditions. This measure should/can improve * significantly datagram
socket latencies at high loads, * when data copying to user space takes lots of time. * (BTW I've just killed the last cli in
IP/IPv6/core/netlink/packet * 8) Great win.) * --ANK (980729)
The order of the tests when we find no data waiting are specified quite explicitly by POSIX 1003.1g, don't change them without having the
standard around please.
COPYRIGHT Kernel Hackers Manual 3.10 June 2014 __SKB_RECV_DATAGRAM(9)
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