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.