Re: getmsg & putmsg

Chris Wedgwood (
Thu, 14 May 1998 20:08:55 +1200

On Wed, May 13, 1998 at 10:24:41PM -0700, David S. Miller wrote:
> You seem to think they must be in the kernel, nothing stops you from
> doing a userland implementation of SysV streams. Everyone first says,
> "Put this in the kernel.", very few people ask "Can we do this in
> userspace?".

I saying this in the knowledge I know almost nothing of STREAMS in practice:

So - can a full working implementation of STREAMS be done is userspace?

I think 'good enough' can be done, but not a 'full' implementation, nor
something robust enough to prevent the possibility of one application
clobbering another. (I think you might also require root privs. or
CAP_NET_BIND_SERVICE to make it work too.... not sure).

> The one advantage of Linux is that we can filter what goes into the
> kernel on technical merit alone, not what marketing or whatever
> wants.

The 'one advantage' - there is only one advantage?


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