Blocking Netlink calls

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Hi,

I have a kernel module that acts as a Generic Netlink server. In the user space I have a daemon which receives Netlink unicast messages from the kernel module using the libnl library [1].

What I'd like to know is if it's possible to send a Netlink message in a blocking manner and to get a direct result back from the daemon. As far as I understand the Netlink concept it is a bus-like system and thus I'm not sure if it's possible at all.

Currently my call to send the message to the user space is as follows:

...
rc = genlmsg_unicast(skb, daemon_pid);
...

Thanks
Yves

[1] http://www.infradead.org/~tgr/libnl/

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