Re: [uml-devel] Re: [uml-user] UNIX socket networking

[BlaisorBlade <blaisorblade_spam@yahoo.it>]

Alle 22:40, martedì 2 marzo 2004, Patrick Kilian ha scritto:
> Hi all,
>
> Am Dienstag, 2. März 2004 19:09 schrieb BlaisorBlade:
> >> Well bind is returning -2 which seams to be -ENOENT. Does somebody
> >> know why this happens?
> >
> > Hmm, I'm no expert with sockets; possibly the folder in which you
> > create the socket does not exist. However, possibly code it like a
> > normal program which just opens the socket and calls bind() and try
> > it.
>
> No the folder exists and is on a rw filesystem. This problem was the reason
> why I abandond the the driver the first time.

You refer to bind in the guest, right? Well, you call the socket->ops->bind, 
while you should probably at least call sys_bind.

Your kernel thread is simply a process running in kernel mode - so instead of 
calling bind(), you just call sys_bind() skipping some useless code (int 
0x80, userspace/kernelspace transition and so on). But you cannot, in 
general, skip anything else unless you have a reason to do so.

Probably, the same reasoning applies to a lot of other code - why sock_create 
instead of sys_socket, why sock_recvmsg  ... and so on. Please, at least 
change both sys_socket and sys_bind before asking again.

I *do not* understand how ENOENT is actually returned, but probably something 
that normally fails for a missing file failed for the lack of coherency.

> Most of the above code should probably be edited with rm
What is that? Indentation cleanup?
> , but you
> wanted to have my results so far. Now go and find a brown paper bag.

No, do not - seeing the code is very useful indeed.

Bye
-- 
Paolo Giarrusso, aka Blaisorblade
Linux registered user n. 292729



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