Horton

Thread

  1. Re: pg_dump and large files - is this a problem?

    Giles Lean <giles@nemeton.com.au> — 2002-10-24T02:54:50Z

    > OK, does pre-1.6 NetBSD have fgetpos/fsetpos that is off_t/quad?

Yes:

    int
    fgetpos(FILE *stream, fpos_t *pos);

    int
    fsetpos(FILE *stream, const fpos_t *pos);

Per comments in <stdio.h> fpos_t is the same format as off_t, and
off_t and fpos_t have been 64 bit since 1994.

    http://cvsweb.netbsd.org/bsdweb.cgi/basesrc/include/stdio.h

Regards,

Giles

  2. Re: pg_dump and large files - is this a problem?

    Bruce Momjian <pgman@candle.pha.pa.us> — 2002-10-24T02:56:01Z

    Looks like I have some more work to do.  Thanks.

---------------------------------------------------------------------------

Giles Lean wrote:
> 
> > OK, does pre-1.6 NetBSD have fgetpos/fsetpos that is off_t/quad?
> 
> Yes:
> 
>     int
>     fgetpos(FILE *stream, fpos_t *pos);
> 
>     int
>     fsetpos(FILE *stream, const fpos_t *pos);
> 
> Per comments in <stdio.h> fpos_t is the same format as off_t, and
> off_t and fpos_t have been 64 bit since 1994.
> 
>     http://cvsweb.netbsd.org/bsdweb.cgi/basesrc/include/stdio.h
> 
> Regards,
> 
> Giles
> 
> 
> 
> 
> 
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-- 
  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, Pennsylvania 19073

  3. Re: pg_dump and large files - is this a problem?

    Bruce Momjian <pgman@candle.pha.pa.us> — 2002-10-24T03:11:44Z

    OK, NetBSD added.  

Any other OS's need this?  Is it safe for me to code something that
assumes fpos_t and off_t are identical?  I can't think of a good way to
test if two data types are identical.  I don't think sizeof is enough.

---------------------------------------------------------------------------

Giles Lean wrote:
> 
> > OK, does pre-1.6 NetBSD have fgetpos/fsetpos that is off_t/quad?
> 
> Yes:
> 
>     int
>     fgetpos(FILE *stream, fpos_t *pos);
> 
>     int
>     fsetpos(FILE *stream, const fpos_t *pos);
> 
> Per comments in <stdio.h> fpos_t is the same format as off_t, and
> off_t and fpos_t have been 64 bit since 1994.
> 
>     http://cvsweb.netbsd.org/bsdweb.cgi/basesrc/include/stdio.h
> 
> Regards,
> 
> Giles
> 
> 
> 
> 
> 

-- 
  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, Pennsylvania 19073

  4. Re: pg_dump and large files - is this a problem?

    Peter Eisentraut <peter_e@gmx.net> — 2002-10-24T22:12:56Z

    Bruce Momjian writes:

> OK, NetBSD added.
>
> Any other OS's need this?  Is it safe for me to code something that
> assumes fpos_t and off_t are identical?  I can't think of a good way to
> test if two data types are identical.  I don't think sizeof is enough.

No, you can't assume that fpos_t and off_t are identical.

But you can simulate a long fseeko() by calling fseek() multiple times, so
it should be possible to write a replacement that works on all systems.

-- 
Peter Eisentraut   peter_e@gmx.net

  5. Re: pg_dump and large files - is this a problem?

    Bruce Momjian <pgman@candle.pha.pa.us> — 2002-10-24T23:43:00Z

    Peter Eisentraut wrote:
> Bruce Momjian writes:
> 
> > OK, NetBSD added.
> >
> > Any other OS's need this?  Is it safe for me to code something that
> > assumes fpos_t and off_t are identical?  I can't think of a good way to
> > test if two data types are identical.  I don't think sizeof is enough.
> 
> No, you can't assume that fpos_t and off_t are identical.

I was wondering --- if fpos_t and off_t are identical sizeof, and fpos_t
can do shift << or >>, that means fpos_t is also integral like off_t.
Can I then assume they are the same?

> But you can simulate a long fseeko() by calling fseek() multiple times, so
> it should be possible to write a replacement that works on all systems.

Yes, but I can't simulate ftello, so I then can't do SEEK_CUR. and if I
can't duplicate the entire API, I don't want to try.

-- 
  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, Pennsylvania 19073