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Comments on What's the fastest way to copy, preserving file attributes, on each platform?

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What's the fastest way to copy, preserving file attributes, on each platform?

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I am looking copy files platform-dependently on Linux, Oracle Solaris, MacOS, BSDs, and Windows.

I have found some system calls for each platform, namely sendfile(), copy_file_range(), fcopyfile(), CopyFile() et cetera. But some of them are documented to copy file attributes, whilst some are not. I am uncertain whether it would be better to do a stat() + chmod() prior the syscalls that do not copy attributes, or go with the classic route of open() + stat() + chmod() + read() + write(), that's guaranteed to work across all UNIX-like systems, and perhaps even Windows.

What is each platform's fastest solution to copy a file with attributes?

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4 comment threads

Highlight the question (4 comments)
Why platform dependent? (2 comments)
Too broad (1 comment)
Any particular use-case? (3 comments)
Highlight the question
Alexei‭ wrote 5 months ago

Can you pinpoint the actual question in the title? If I understood correctly, the question is something like:

Is Linux's 3 syscalls, and FreeBSD's and Solaris' sendfile function copying file attributes to the new file?

Karl Knechtel‭ wrote 5 months ago

Right now, it reads to me like nine questions bundled together - one for each call - each of which is best answered by linking the corresponding documentation. This doesn't really make it a coherent, useful question for a Q&A site, IMO. If the underlying idea is to make it possible for people to select a function, on each platform, that copies files with attributes, then it should be presented that way: "how can I copy files with attributes regardless of platform?" - and if there is a platform-agnostic way, that should be an acceptable answer. Unless there's some other overriding factor you want to consider (performance?) which should also be stated explicitly ("what's the fastest way to copy, preserving file attributes, on each platform?").

Melkor-1‭ wrote 5 months ago

Karl Knechtel‭ Better now?

Karl Knechtel‭ wrote 5 months ago

Yes, I think that fixes all problems.

Skipping 1 deleted comment.