Struct File 

pub struct File {
    pub mode: FileMode,
    pub file: FileKind,
}

The File struct represents an abstraction over a file descriptor in the operating system.

This struct encapsulates information about an open file, access mode, and other metadata necessary for performing file operations such as reading, writing, and seeking. It also holds a reference to the kernel’s underlying file structure (FileKind), allowing the operating system to perform actual file operations on the filesystem.

The File struct is used to track the state of an open file, ensuring that the correct file operations are executed and resources are managed efficiently.

Fields

mode: FileMode

The access mode of the file (e.g., read, write, read/write).

FileMode is used by user program to tell kernel “how” open the file, and records internally what operation can be done on the file.

Refer to FileMode for detail.

file: FileKind

The kernel file structure.

This field contains the underlying representation of the file within the operating system kernel. It holds the kernel’s metadata for the file, such as its name, permissions, and the actual file object used to perform system-level file operations.

The FileKind enum allows this field to represent either a regular file (FileKind::RegularFile) or a special file such as standard input/output (FileKind::Stdio).

Trait Implementations

impl Clone for File

fn clone(&self) -> File

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.