Philip Warner wrote: > At 01:02 AM 23/10/2002 -0400, Bruce Momjian wrote: > > >OK, you are saying if we don't have fseeko(), there is no reason to use > >off_t, and we may as well use long. What limitations does that impose, > >and are the limitations clear to the user. > > What I'm saying is that if we have not got fseeko then we should use any > 'seek-class' function that returns a 64 bit value. We have already made the > assumption that off_t is an integer; the same logic that came to that > conclusion, applies just as validly to the other seek functions.
Oh, I see, so try to use fsetpos/fgetpos? I can write wrappers for those to look like fgetpos/fsetpos and put it in /port. > Secondly, if there is no 64 bit 'seek-class' function, then we should > probably use a size_t, but a long would probably be fine too. I am not > particularly attached to this part; long, int etc etc. Whatever is most > likely to return an integer and work with whatever function we choose. > > As to implications: assuming they are all integers (which as you know I > don't like), we should have no problems. > > If a system does not have any function to access 64 bit file offsets, then > I'd say they are pretty unlikely to have files > 2GB. OK, my OS can handle 64-bit files, but has only fgetpos/fsetpos, so I could get that working. The bigger question is what about OS's that have 64-bit off_t/files but don't have any seek-type functions. I did research to find mine, but what about others that may have other variants? I think you are right that we have to not use off_t and use long if we can't find a proper 64-bit seek function, but what are the failure modes of doing this? Exactly what happens for larger files? -- Bruce Momjian | http://candle.pha.pa.us [EMAIL PROTECTED] | (610) 359-1001 + If your life is a hard drive, | 13 Roberts Road + Christ can be your backup. | Newtown Square, Pennsylvania 19073 ---------------------------(end of broadcast)--------------------------- TIP 5: Have you checked our extensive FAQ? http://www.postgresql.org/users-lounge/docs/faq.html
