Hi all, I have problems using netlink to send messages to my user application. When I use skb = skb_recv_datagram(), initially, to receive a message from the userspace, and send it (netlink_unicast) back using the same skb pointer, then I have no problem. However, the second time when I send the second time the kernel freezes. Below is the code: struct sk_buff *skb_nl = NULL; struct nlmsghdr *nlh = NULL; int err; // Netlink queue is my new netlink type nl_sk = netlink_kernel_create(NETLINK_QUEUE, nl_data_ready); skb_nl = skb_recv_datagram(nl_sk, 0, 0, &err); nlh = (struct nlmsghdr *)skb_nl->data; nlq_pid = nlh->nlmsg_pid; NETLINK_CB(skb_nl).groups = 0; NETLINK_CB(skb_nl).pid = 0; /* from kernel */ NETLINK_CB(skb_nl).dst_pid = nlq_pid; NETLINK_CB(skb_nl).dst_groups = 0; err = netlink_unicast(nl_sk, skb_nl, nlq_pid, MSG_DONTWAIT); err = netlink_unicast(nl_sk, skb_nl, nlq_pid, MSG_DONTWAIT); Hope somebody can explain what happens. cheers Chiang -- Kernelnewbies: Help each other learn about the Linux kernel. Archive: http://mail.nl.linux.org/kernelnewbies/ FAQ: http://kernelnewbies.org/faq/
