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.
Read more about this topic: File Descriptor
Famous quotes containing the word operations:
“It may seem strange that any road through such a wilderness should be passable, even in winter, when the snow is three or four feet deep, but at that season, wherever lumbering operations are actively carried on, teams are continually passing on the single track, and it becomes as smooth almost as a railway.”
—Henry David Thoreau (1817–1862)