Date: Sat, 4 Sep 2010 22:21:57 +0100 From: "Robert N. M. Watson" <rwatson@freebsd.org> To: Andre Oppermann <andre@freebsd.org> Cc: =?iso-8859-1?Q?Michael_T=FCxen?= <Michael.Tuexen@lurchi.franken.de>, freebsd-net@freebsd.org Subject: Re: Removal of deprecated implied connect for TCP Message-ID: <5A1BD1ED-B55D-43A5-8D91-DD243A48F1AE@freebsd.org> In-Reply-To: <4C7D02BB.40300@freebsd.org> References: <4C7A7B25.9040300@freebsd.org> <alpine.BSF.2.00.1008311102220.22661@fledge.watson.org> <7B42D7FB-B782-4EE9-8813-BF7D3ED3274B@lurchi.franken.de> <4C7D02BB.40300@freebsd.org>
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On 31 Aug 2010, at 14:25, Andre Oppermann wrote: >>> I'm not entirely comfortable with this change, and would like a chance to cogitate on it a bit >>> more. While I'm not aware of any applications depending on the semantic for TCP, I know that >>> we do use it for UNIX domain sockets. Since it's a documented API, if we are going to remove >>> it, then we need to go through a deprecation process, not least by marking it as a deprecated >>> API in 8.x before having it vanish in 9.0. > > >> sendto() is also used for SCTP SOCK_STREAMS and SOCK_SEQPACKET sockets... > > sendto() will not be touched or modified. It's just that on a TCP socket > the tcp protocol will not perform an implied connect anymore. The only thing > that changes is TCP dropping a deprecated and experimental extension and > behaving like every other UNIXy OS. > > sendto() will continue to work for UDP, SCTP and Domain sockets and whoever > else currently supports it, except TCP. Right -- I think you're missing the thrust of this objection: it's a standard part of the FreeBSD API that sendto(2) with an address implicitly connects across all over our protocols, so making TCP be the only exception seems counter-productive. What is it that will actually be accomplished by removing this functionality, other than reducing the number of lines of code in tcp_usr_send by a couple of dozen? Robert
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