Messages in this thread |  | | Date | Sat, 13 Oct 2001 16:53:32 +0200 | From | Jamie Lokier <> | Subject | Re: Security question: "Text file busy" overwriting executables but not shared libraries? |
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Linus Torvalds wrote: > Trust me. The people who came up with MAP_COPY were stupid. Really. It's > an idiotic concept, and it's not worth implementing.
I can think of an efficiency-related use for MAP_COPY, and it has nothing to do with shared libraries:
- An editor using mmap() to read a file.
The existing semantics require that you either call read() and waste (potentially shared) memory to do this, or use MAP_PRIVATE and then deliberately page in and dirty all of the file's pages.
Neither of these seem to be the most efficient way to launch an editor.
cheers, -- Jamie - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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