linux下make zImage出现的问题

panda1004

问题好象有些．．．．．
我在文件socket.c里加入:
asmlinkage long sys_sendto(int fd, void * buff, size_t len, unsigned flags,
                           struct sockaddr *addr, int addr_len)
{
        printk("enter sys_sendto ok!";   //加入的语句
        struct socket *sock;
        char address[MAX_SOCK_ADDR];
        int err;
        struct msghdr msg;
        struct iovec iov;

        sock = sockfd_lookup(fd, &err);
        ......
}

用arm-linux-gcc交叉编译器编译出错:
socket.c: In function `sys_sendto':
socket.c:1204: parse error before `struct'
socket.c:1210: `sock' undeclared (first use in this function)
socket.c:1210: `err' undeclared (first use in this function)
socket.c:1213: `iov' undeclared (first use in this function)
socket.c:1215: `msg' undeclared (first use in this function)
socket.c:1223: `address' undeclared (first use in this function)
socket.c:1243: warning: control reaches end of non-void function
请各位高手指点一二！