Path: utzoo!utgpu!news-server.csri.toronto.edu!mailrus!wuarchive!decwrl!sgi!rpw3@rigden.wpd.sgi.com
From: rpw3@rigden.wpd.sgi.com (Rob Warnock)
Newsgroups: comp.protocols.tcp-ip
Subject: Re: TCP Push?
Message-ID: <70729@sgi.sgi.com>
Date: 30 Sep 90 08:55:32 GMT
References: <9009281442.AA26616@cssun.tamu.edu>
Sender: guest@sgi.sgi.com
Reply-To: rpw3@sgi.com (Rob Warnock)
Organization: Silicon Graphics, Inc., Mountain View, CA
Lines: 25

In article <9009281442.AA26616@cssun.tamu.edu> willis@CSSUN.TAMU.EDU
(Willis Marti) writes:
+---------------
| This has to be one of the novice questions, but I haven't been able to dig
| out the answer. Programming under SunOS 4.1, using sockets and send and all
| that, how can I tell the TCP to "push" the (possibly buffered) data out *now*
| and not wait to piggyback anything....
+---------------

All "BSD 4.x"-derived TCPs (and I believe that includes Sun's) automatically
set the "PUSH" bit on the last packet of any Unix "write()". That is, a write
to a socket *is* a "write-and-push".

There are too many applications that would break if this were not the case.


-Rob

-----
Rob Warnock, MS-9U/510		rpw3@sgi.com		rpw3@pei.com
Silicon Graphics, Inc.		(415)335-1673		Protocol Engines, Inc.
2011 N. Shoreline Blvd.
Mountain View, CA  94039-7311