On Tuesday, September 16, 2003, at 08:56 AM, Stefan Werner wrote: Hi, I want to send UDP packets from kernel space and am currently struggling with the sosocket() call. It appears to be close to undocumented and almost an hour of research on google did not turn up much. I'd be very happy if I could get a simple code snippet that will allow me to send a void* buffer (I haven't figured out how to use mbuf yet) to a remote IP/Port. I found a little code in the nfs source code, but I couldn't quite figure out where exactly the payload is and what the other values mean. I can understand your struggle. I don't find the 'sosocket()' call anywhere in the xnu source base. Are you sure you have that right? Some thoughts: A) Using in-the-kernel calls like this is risky, in that there is no guarantee that the semantics of the call will remain untouched as the kernel evolves. This is just FYI. B) Use the source, Luke. The 'xnu' project contains the code that both implements and uses these calls, and you should be able to make use of it to get the information you need by reading code. There is no documentation, per se, for the kernel (cf. (A)). In particular, check the "aurp" code in the "bsd/netat" directory. This code sets up a UDP tunnel between the local system and a remote system to transmit AppleTalk packets; it should have a lot in common with your efforts. Note that the code is a bit encrusted with the dust of the ages; I don't know that it has been run or tested since the Rhapsody days. C) As a guide to the code, you should consider looking at Wright/Stevens, "TCP/IP Illustrated, V.2", Addison-Wesley, 1995. It is a very good "walk-through" of the code implementing the IP support in earier BSD variants. A lot of nits are different, and Darwin has the DLIL layer that is not mentioned in the book, but it will provide you with enough information that the Darwin code should look familiar. The 'mbuf' structure and use is detailed in Ch. 2. Regards, Justin -- /~\ The ASCII Justin C. Walker, Curmudgeon-at-Large \ / Ribbon Campaign X Help cure HTML Email / \ _______________________________________________ darwin-kernel mailing list | darwin-kernel@lists.apple.com Help/Unsubscribe/Archives: http://www.lists.apple.com/mailman/listinfo/darwin-kernel Do not post admin requests to the list. They will be ignored.