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skb_pull(9) [centos man page]

SKB_PULL(9)							 Linux Networking						       SKB_PULL(9)

skb_pull - remove data from the start of a buffer SYNOPSIS
unsigned char * skb_pull(struct sk_buff * skb, unsigned int len); ARGUMENTS
skb buffer to use len amount of data to remove DESCRIPTION
This function removes data from the start of a buffer, returning the memory to the headroom. A pointer to the next data in the buffer is returned. Once the data has been pulled future pushes will overwrite the old data. COPYRIGHT
Kernel Hackers Manual 3.10 June 2014 SKB_PULL(9)

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__SKB_RECV_DATAGRAM(9)						 Linux Networking					    __SKB_RECV_DATAGRAM(9)

__skb_recv_datagram - Receive a datagram skbuff SYNOPSIS
struct sk_buff * __skb_recv_datagram(struct sock * sk, unsigned int flags, int * peeked, int * off, int * err); ARGUMENTS
sk socket flags MSG_ flags peeked returns non-zero if this packet has been seen before off an offset in bytes to peek skb from. Returns an offset within an skb where data actually starts err error code returned DESCRIPTION
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 skb_free_datagram) * 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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