接口 netlink的app例子

#include
#include
#define MAX_PAYLOAD 1024
struct sockaddr_nl src_addr, dest_addr;
struct msghdr msg;
struct nlmsghdr *nlh = NULL;
struct iovec iov;
int sock_fd;
void main() ...{
 sock_fd = socket(PF_NETLINK, SOCK_RAW,NETLINK_TEST);
 memset(&src_addr, 0, sizeof(src_addr));
 src__addr.nl_family = AF_NETLINK;    
 src_addr.nl_pid = getpid();
 src_addr.nl_groups = 0;
 bind(sock_fd, (struct sockaddr*)&src_addr,
      sizeof(src_addr));
 memset(&dest_addr, 0, sizeof(dest_addr));
 dest_addr.nl_family = AF_NETLINK;
 dest_addr.nl_pid = 0; 
 dest_addr.nl_groups = 0;
 nlh=(struct nlmsghdr *)malloc(
                         NLMSG_SPACE(MAX_PAYLOAD));
 
 nlh->nlmsg_len = NLMSG_SPACE(MAX_PAYLOAD);
 nlh->nlmsg_pid = getpid();
 nlh->nlmsg_flags = 0;
 
 strcpy(NLMSG_DATA(nlh), "Hello you!");
 iov.iov_base = (void *)nlh;
 iov.iov_len = nlh->nlmsg_len;
 msg.msg_name = (void *)&dest_addr;
 msg.msg_namelen = sizeof(dest_addr);
 msg.msg_iov = &iov;
 msg.msg_iovlen = 1;
 sendmsg(fd, &msg, 0);
 
 memset(nlh, 0, NLMSG_SPACE(MAX_PAYLOAD));
 recvmsg(fd, &msg, 0);
 printf(" Received message payload: %s ",
        NLMSG_DATA(nlh));
  
 
 close(sock_fd);
}