[mdlug] aix, mode_t, struct stat, >2G

[Robert Meier]

big developers,

I'm trying to write files larger than 2G on aix-5.3 with gcc-3.3.2.

write(2) is called successively with more than 2G cumulative data.

On linux, the result is a file that ls reports as longer than 2G.
On aix, the result is a file that ls reports is one byte shorter than 2G.

I have example gcc code on aix which writes files greater than 2G.
As far as I have been able to determine, it uses only open(2), and write(2).
Files produced by the example code less than 2G have a normal mode
(see <sys/stat.h> struct stat .st_mode) 0100644 (regular file u+rw,go+r).
Files produced by the example code greater than 2G have no mode (0).

I've found nothing so far in the aix manuals, gcc manuals,
or elsewhere on line, that documents the change in mode with size.

Has anyone seen change in mode before?
On what OS?
With what compiler?
Where is it documented?

TIA,
-- 
Dr. Robert J. Meier