I agree with you, for me the main limitation of this system is that you have to be sure that the temporary file exists in the same fs as the target, which in ge

I agree with you, for me the main limitation of this system is that you have to be sure that the temporary file exists in the same fs as the target, which in general involves creating the temporary file in the same directory. It works well, but I always feel icky creating temporary files in the middle of the filesystem (which may end up lingering if my program crashes before I could issue the rename syscall). But beyond that I'm not aware of any portability issue, except maybe with weird filesystems like NFS in some non-standard configuration that doesn't implement strict locking.