Module fs

Available on crate feature fs only.

Asynchronous file and standard stream adaptation.

This module contains utility methods and adapter types for input/output to files or standard streams (Stdin, Stdout, Stderr), and filesystem manipulation, for use within (and only within) a Tokio runtime.

Tasks run by worker threads should not block, as this could delay servicing reactor events. Portable filesystem operations are blocking, however. This module offers adapters which use a blocking annotation to inform the runtime that a blocking operation is required. When necessary, this allows the runtime to convert the current thread from a worker to a backup thread, where blocking is acceptable.

Usage

Where possible, users should prefer the provided asynchronous-specific traits such as AsyncRead, or methods returning a Future or Poll type. Adaptions also extend to traits like std::io::Read where methods return std::io::Result. Be warned that these adapted methods may return std::io::ErrorKind::WouldBlock if a worker thread can not be converted to a backup thread immediately.

Modules

os

OS-specific functionality.

Structs

DirEntry

Entries returned by the ReadDir stream.

File

A reference to an open file on the filesystem.

OpenOptions

Options and flags which can be used to configure how a file is opened.

ReadDir

Stream of the entries in a directory.

Functions

canonicalize

Returns the canonical, absolute form of a path with all intermediate components normalized and symbolic links resolved.

create_dir

Creates a new, empty directory at the provided path

create_dir_all

Recursively create a directory and all of its parent components if they are missing.

hard_link

Creates a new hard link on the filesystem.

metadata

Given a path, query the file system to get information about a file, directory, etc.

read

Read the entire contents of a file into a bytes vector.

read_dir

Returns a stream over the entries within a directory.

read_link

Reads a symbolic link, returning the file that the link points to.

read_to_string

Creates a future which will open a file for reading and read the entire contents into a string and return said string.

remove_dir

Removes an existing, empty directory.

remove_dir_all

Removes a directory at this path, after removing all its contents. Use carefully!

remove_file

Removes a file from the filesystem.

rename

Rename a file or directory to a new name, replacing the original file if to already exists.

set_permissions

Changes the permissions found on a file or a directory.

symlink_metadata

Queries the file system metadata for a path.

write

Creates a future that will open a file for writing and write the entire contents of contents to it.