Re: [GENERAL] Linux Largefile Support In Postgresql RPMS

Tom Lane writes:

> > The prototype for fseek() is long int; I had assumed that off_t was not
> > defined if _LARGEFILE_SOURCE was not defined.

All that _LARGEFILE_SOURCE does is make fseeko() and ftello() visible on
some systems, but on some systems they should be available by default.

> Oh, you're right.  A quick look at HPUX shows it's the same way: ftell
> returns long int, ftello returns off_t (which presumably is an alias
> for long long int).  Okay, OFF_T seems a reasonable answer.

fseek() and ftell() using long int for the offset was a mistake, therefore
fseeko() and ftello() were invented.  (This is independent of whether the
large file interface is used.)

To activate the large file interface you define _FILE_OFFSET_BITS=64,
which transparently replaces off_t and everything that uses it with a 64
bit version.  There is no need to use any of the proposed macro tricks
(because that exact macro trick is already provided by the OS).

-- 
Peter Eisentraut   peter_e@gmx.net