On Wednesday 13 December 2006 22:03, Mauricio Lin wrote:
> Hi all,
>
> I am using a module that employs netlink functions and data.
>
> After compiling it, I insert the module as:
>
> # insmod test.ko
>
> but the terminal (prompt) gets locked. After debugging the module, I
> noticed that skb_recv_datagram() is responsible for that.
>
> Take a look the snippet of the code:
>
> skb = skb_recv_datagram(nl_sk, 0, 0, &err);
> if (!skb) {
> printk(KERN_ERR
> "netlink_test: skb_recv_datagram!\n");
> return;
> }
>
> When I interrupt the prompt (as it was locked by inserting the module)
> typing <Control>+C, the message "netlink_test: skb_recv_datagram!" is
> printed, so I wonder why this is happening.
>
> Is it normal skb_recv_datagram() blocks the terminal? How can I solve
> it?
>
Hi Mauricio,
The skb_recv_datagram() will block until data is available to read. Since you
call this function from module_init(), it will block the insmod process.
Regards,
tavi
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