Tom Lane wrote:
> Bruce Momjian <pgman@candle.pha.pa.us> writes:
> > I see:
> > The fseeko() function is identical to fseek(), except it takes an off_t
> > argument instead of a long. Likewise, the ftello() function is identical
> > to ftell(), except it returns an off_t.
>
> Indeed. Notice the complete lack of any commitment about the size of
> off_t ...
>
> > while fsetpos() is:
> > fsetpos(FILE *stream, const fpos_t *pos);
>
> ... or the size of fpos_t.
>
> You might find it illuminating to read this random extract from the
> HPUX 10.20 man pages:
...
> I don't see any reason to believe that fgetpos buys us anything but
> notational inconvenience. It certainly doesn't buy large file support,
> at least not without the same behind-the-scenes redefinitions needed for
> fseek/fseeko and friends...
Clearly there is the issues that fseek uses long, which isn't enough for
large file support. On BSD/OS, we have fsetpos, which is the way we do
large file support:
int fseek(FILE *stream, long offset, int whence);
int fsetpos(FILE *stream, const fpos_t *pos);
My point is that it seems fsetpos is the approved way of accessing large
files, rather than fseeko. In fact, I don't have fseeko here but I do
have fsetpos, and it does handle large files because my includes have
this:typedef off_t fpos_ttypedef quad_t off_t;
-- Bruce Momjian | http://candle.pha.pa.us pgman@candle.pha.pa.us | (610)
359-1001+ If your life is a hard drive, | 13 Roberts Road + Christ can be your backup. | Newtown Square,
Pennsylvania19073
