tcp_sendmsg working

[linux lover <linux_lover2004@yahoo.com>]

hello,
how tcp_sendmsg add message from application layer to
socket buffer skb? 

i am unable to find message field in msghdr help me.
struct msghdr {
        void    *       msg_name;       /* Socket name
                 
*/
        int             msg_namelen;    /* Length of
name               
*/
        struct iovec *  msg_iov;        /* Data blocks
                 
*/
        __kernel_size_t msg_iovlen;     /* Number of
blocks             
*/
        void    *       msg_control;    /* Per
protocol magic (eg BSD 
file descriptor passing) */
        __kernel_size_t msg_controllen; /* Length of
cmsg list */
        unsigned        msg_flags;
};
also what is use of struct iovec? is that store actual
data? if yes then how that is included in socket
buffer?

regards,
linux_lover



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