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Most of the glibc file functions have a 64-bit version with "64" appended to the name. I think this will alter the size type used, so you might need to use a 64-bit integer for size and offset values. If you look at info libc and find a function such as open you should see a variant such as open64.
I am opening the file using ofstream, and when I write to this file, at the point where it exceeds the 2GB limit, I get the error "filesize limit exceeded".
I'm pretty sure ofstream is stuck with the register size of the architecture. While it's a portable way to deal with files in the C++ realm, with glibc available I think you're better off just using C to deal with huge files.