Man page 9 : kernel_recvmsg

kernel_recvmsg - Receive a message from a socket (kernel space)

int kernel_recvmsg(struct socket *  sock , struct msghdr *  msg , struct kvec *  vec , size_t  num , size_t  size , int  flags );

sock
    The socket to receive the message from

msg
    Received message

vec
    Input s/g array for message data

num
    Size of input s/g array

size
    Number of bytes to read

flags
    Message flags (MSG_DONTWAIT, etc...)

On return the msg structure contains the scatter/gather array passed in the vec argument. The array is modified so that it consists of the unfilled portion of the original array.

The returned value is the total number of bytes received, or an error.