Oracle Linux implements at-suffixed system
interfaces as individual system calls, for example:
faccessat()fchmodat()fchownat()fstatat64()futimensat()linkat()mkdirat()mknodat()name_to_handle_at()newfstatat()open_by_handle_at()openat()readlinkat()renameat()symlinkat()unlinkat()utimensat()
These system calls implement a superset of the functionality
of their old non-at-suffixed counterparts.
They take an additional first argument that is either an open
directory file descriptor. In which case, the operation on a
relative pathname is taken relative to the specified
directory, or is the reserved value
AT_FDCWD, in which case the operation takes
place relative to the current working directory.