> After more staring at the code, I have a theory. SlruPhysicalWritePage
> and SlruPhysicalReadPage are coded on the assumption that close() can
> never return any interesting failure. However, it now occurs to me that
> there are some filesystem implementations wherein ENOSPC could be
> returned at close() rather than the preceding write(). (For instance,
> the HPUX man page for close() states that this never happens on local
> filesystems but can happen on NFS.) So it'd be possible for
> SlruPhysicalWritePage to think it had successfully written a page when
> it hadn't. This would allow a checkpoint to complete :-(
FreeBSD 4.7/4.9 and the UFS filesystem
RETURN VALUES The close() function returns the value 0 if successful; otherwise the value -1 is returned and
theglobal variable errno is set to
indicate the error.
ERRORS Close() will fail if:
[EBADF] D is not an active descriptor.
[EINTR] An interrupt was received.
Chris