File Descriptor - Upcoming Operations

Upcoming Operations

A series of new operations on file descriptors has been added to many modern Unix-like systems, as well as numerous C libraries, to be standardized in a future version of POSIX. The at suffix signifies that the function takes an additional first argument supplying a file descriptor from which relative paths are resolved, the forms lacking the at suffix thus becoming equivalent to passing a file descriptor corresponding to the current working directory. The purpose of these new operations is to defend against a certain class of TOCTTOU attacks.

  • openat
  • faccessat
  • fchmodat
  • fchownat
  • fstatat
  • futimesat
  • linkat
  • mkdirat
  • mknodat
  • readlinkat
  • renameat
  • symlinkat
  • unlinkat
  • mkfifoat
  • fdopendir

The Native API of the Windows NT family of operating systems also allows callers to specify a root directory when they open a file or other object by name.

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