6a818c3cb4
fd_duplicate_data_fd() is renamed to copy_data_fd(). This makes the two functions have nicely similar names. Now fd-util.[ch] is again about low-level file descriptor manipulations. copy_data_fd() is a complex function that internally wraps the other functions in copy.c. I want to move copy.c and the whole cluster of related code from basic/ to shared/ later on, and this is a preparatory step for that.
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