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From: ron@topaz.rutgers.edu.UUCP
Newsgroups: comp.unix.wizards
Subject: Re: a creat() hack
Message-ID: <14533@topaz.rutgers.edu>
Date: Tue, 8-Sep-87 00:11:20 EDT
Article-I.D.: topaz.14533
Posted: Tue Sep  8 00:11:20 1987
Date-Received: Wed, 9-Sep-87 00:46:08 EDT
References: <3921@cit-vax.Caltech.Edu>
Organization: Rutgers Univ., New Brunswick, N.J.
Lines: 10
Keywords: creat truncate versions efficiency

We use the deferred truncate property to make cp/rcp totally
fool proof for dunderheads who like to copy files on top of
themselves (note you can not check for this in rcp or with
remote file systems).  The way we did it is to open files that
exits rather than always creating over them.  When we are finished
we truncate them to the right length.  The user gets what he asked
for, each block is read and written back into the same place, but
the file is not destroyed.

-Ron