From mboxrd@z Thu Jan  1 00:00:00 1970
Message-Id: <200103282256.f2SMuEl95658@orthanc.ab.ca>
From: Lyndon Nerenberg <lyndon@orthanc.ab.ca>
To: 9fans@cse.psu.edu
Subject: Re: [9fans] 9fs/9auth for FreeBSD 
In-reply-to: Your message of "Wed, 28 Mar 2001 17:28:06 EST."
             <Pine.GSO.4.21.0103281725160.26500-100000@weyl.math.psu.edu> 
Date: Wed, 28 Mar 2001 15:56:14 -0700
Topicbox-Message-UUID: 76486672-eac9-11e9-9e20-41e7f4b1d025

>>>>> "Alexander" == Alexander Viro <viro@math.psu.edu> writes:

    Alexander> PS: POSIX says nothing, since append-only is BSDism and
    Alexander> POSIX is a codification of Missed'em'V bugs, so
    Alexander> append-only is out of scope.

Let's make sure we're talking about the same thing here. The chflags()
behaviour is 4.4BSD-specific. The O_APPEND behaviour has been around
since the dawn of time (or at least SVR1). My copy of POSIX is at
home, however SuS V2 states explicitly (both open(2) and write(2))
that O_APPEND causes all writes to set the file pointer to the end of
the file prior to performing the write I/O, and that the combination
of the implicit seek and the associated write are atomic.

--lyndon