Struct File 

pub struct File {
    pub node: Arc<dyn VfsNode>,
    pub flags: OpenFlags,
    pub nonblock: AtomicBool,
    pub position: RwLock<usize>,
    pub refcount: RwLock<usize>,
    pub path: Option<String>,
}

Open file structure

Fields

node: Arc<dyn VfsNode>

VFS node this file refers to

flags: OpenFlags

Open flags

nonblock: AtomicBool

Non-blocking I/O flag (can be toggled via fcntl F_SETFL after open). Stored as AtomicBool because File is behind Arc and F_SETFL needs to toggle this without mutable access.

position: RwLock<usize>

Current position in file

refcount: RwLock<usize>

Reference count

path: Option<String>

Absolute path this file was opened with (for dirfd resolution in *at syscalls)

Implementations

impl File

pub fn new(node: Arc<dyn VfsNode>, flags: OpenFlags) -> Self

Create a new file structure

pub fn new_with_path( node: Arc<dyn VfsNode>, flags: OpenFlags, path: String, ) -> Self

Create a new file structure with a known path

pub fn read(&self, buffer: &mut [u8]) -> Result<usize, KernelError>

Read from the file

pub fn write(&self, data: &[u8]) -> Result<usize, KernelError>

Write to the file

pub fn seek(&self, from: SeekFrom) -> Result<usize, KernelError>

Seek to a position in the file

pub fn tell(&self) -> usize

Get current position

pub fn inc_ref(&self)

Increment reference count

pub fn dec_ref(&self) -> usize

Decrement reference count