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POSIX file semantics

In the area of "requires POSIX filesystem semantics" what is typically meant is:

  • allows hierarchical file names and resolution (......)
  • supports at least close-to-open semantics
  • umask/unix permissions, 3 filetimes
  • 8bit byte support
  • supports atomic renames on same filesystem
  • fsync/dirfsync durability gurantee/limitation
  • supports multi-user protection (resizing file returns 0 bytes not junk)
  • rename and delete open files (Windows does not do that)
  • file names supporting all bytes beside '/' and \0

Sometimes it also means symlink/hardlink support as well as file names and 32bit file pointers (minimum). In some cases it is also used to refer specific API features like fcntl locking, mmap or truncate or AIO.

See also:
  • 7 tools to robocopy copy locked files or in use files.
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