SKB_APPEND_DATATO_FR(9) Linux Networking SKB_APPEND_DATATO_FR(9)NAME
skb_append_datato_frags - append the user data to a skb
int skb_append_datato_frags(struct sock * sk, struct sk_buff * skb,
int (*getfrag) (void *from, char *to, int offset, int len, int odd, struct sk_buff *skb), void * from,
skb structure to be appened with user data.
call back function to be used for getting the user data
pointer to user message iov
length of the iov message
This procedure append the user data in the fragment part of the skb if any page alloc fails user this procedure returns -ENOMEM
COPYRIGHT Kernel Hackers Manual 3.10 June 2014 SKB_APPEND_DATATO_FR(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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