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Could someone please explain, what exactly this O_LARGEFILE option does to support opening of large files.
And can there be any side effects of compiling with -D_FILE_OFFSET_BITS=64 flag. In other words, when compiled with this option do we have to make sure something.
Use _FILE_OFFSET_BITS in preference to O_LARGEFILE. These are used on 32 bit systems to allow opening files so large that they exceed the range of a 32bit file pointer.
No, you don’t have to do anything special. If you are on 64bit Linux it makes no difference anyway.