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Path: utzoo!watmath!watcgl!dmmartindale
From: dmmartindale@watcgl.UUCP (Dave Martindale)
Newsgroups: net.unix-wizards
Subject: Re: rcs problem
Message-ID: <2386@watcgl.UUCP>
Date: Sat, 7-Apr-84 14:56:19 EST
Article-I.D.: watcgl.2386
Posted: Sat Apr  7 14:56:19 1984
Date-Received: Sun, 8-Apr-84 01:33:43 EST
References: <971@qubix.UUCP>
Organization: U of Waterloo, Ontario
Lines: 6

In versions of stdio which use _sobuf, it is the already-allocated internal
buffer used for the standard output stream.  "setbuf(stdout, _sobuf)"
forces stdio to buffer stdout even when it would ordinarily not do so
(e.g. output is to a tty) but cleverly uses the buffer which is already
allocated to that purpose rather than allocating a new one.
As you discovered, rather non-portable.