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The difference between mmap and mmap64 is the type of 'offset' argument. mmap64 always uses a 64-bit interger as offset, while mmap uses off_t, whose size can vary on different operating systems or architectures. However, not all operating systems support mmap64. Fortunately, although FreeBSD only has mmap, its off_t is always 64-bit regardless of architectures, so we can simply use mmap when sizeof(off_t) == 8. https://bugzilla.gnome.org/show_bug.cgi?id=791779
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