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Date: Mon, 19 Mar 2007 15:41:38 +0000 From: David Howells <dhowells@...hat.com> To: Alan Cox <alan@...rguk.ukuu.org.uk> Cc: Kyle Moffett <mrmacman_g4@....com>, davem@...emloft.net, netdev@...r.kernel.org, herbert.xu@...hat.com, linux-kernel@...r.kernel.org, hch@...radead.org, arjan@...radead.org Subject: Re: [PATCH 0/5] [RFC] AF_RXRPC socket family implementation [try #2] Alan Cox <alan@...rguk.ukuu.org.uk> wrote: > > > Other RPC types use normal socket types. > > > > They do? Examples please. I didn't think Linux, at least, has any other > > RPC socket families, though I could be wrong as I haven't made a thorough > > study of them. > > SunRPC is implemented in user space and uses the existing TCP/IP layer > and socket types, even though it is using them in an RPC manner and > viewed at the RPC layer they are RPCs SunRPC is not then a suitable analogy. There is no socket interface that provides SunRPC as far as I know, so your example is invalid. Yes, SunRPC is built on top of something else, SOCK_DGRAM, SOCK_STREAM or whatever, but that's like saying TCP is a datagram service rather than a stream service because it's built on a datagram service (IP). What a protocol uses out the back is pretty much irrelevant - what is relevant is what the protocol in question actually appears to provide to anyone using it. > > I have made my client sockets use connect(), but that's just a > > convenience and I need to make it possible to avoid doing that to > > make it useful to the kernel. It's similar to SOCK_DGRAM sockets in > > this respect. > > So use SOCK_DGRAM, its clearly near enough. No, it's not. SOCK_DGRAM is an unreliable, unidirectional datagram passing service. David - To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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