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All the Perl that's Practical to Extract and Report

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  • You're right: O_EXCL only matters with O_CREAT. It guarantees (on a local filesystem, at least, don't expect anything on networked filesystems) that the open(2) fails (with errno == EEXIST) if a file by the specified name already exists. Nothing to do with locking, only to do with EXCLusive CREATion.
  • Yes, I am wrong.

    Thanks :)