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skb_peek(9) [centos man page]

SKB_PEEK(9)							 Linux Networking						       SKB_PEEK(9)

skb_peek - peek at the head of an sk_buff_head SYNOPSIS
struct sk_buff * skb_peek(const struct sk_buff_head * list_); ARGUMENTS
list_ list to peek at DESCRIPTION
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 head 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(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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