Re: [9fans] 9fs/9auth for FreeBSD

[Lyndon Nerenberg <lyndon@orthanc.ab.ca>]

>>>>> "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