Jeremy Soller
50 lines
1.3 KiB
Rust
50 lines
1.3 KiB
Rust
//! File structs
|
|
|
|
use alloc::sync::Arc;
|
|
use crate::event;
|
|
use spin::RwLock;
|
|
use crate::scheme::{self, SchemeNamespace, SchemeId};
|
|
use crate::syscall::error::{Result, Error, EBADF};
|
|
|
|
/// A file description
|
|
#[derive(Debug)]
|
|
pub struct FileDescription {
|
|
/// The namespace the file was opened from (used for debugging)
|
|
pub namespace: SchemeNamespace,
|
|
/// The scheme that this file refers to
|
|
pub scheme: SchemeId,
|
|
/// The number the scheme uses to refer to this file
|
|
pub number: usize,
|
|
/// The flags passed to open or fcntl(SETFL)
|
|
pub flags: usize,
|
|
}
|
|
|
|
/// A file descriptor
|
|
#[derive(Clone, Debug)]
|
|
#[must_use = "File descriptors must be closed"]
|
|
pub struct FileDescriptor {
|
|
/// Corresponding file description
|
|
pub description: Arc<RwLock<FileDescription>>,
|
|
/// Cloexec flag
|
|
pub cloexec: bool,
|
|
}
|
|
|
|
impl FileDescriptor {
|
|
pub fn close(self) -> Result<usize> {
|
|
if let Ok(file) = Arc::try_unwrap(self.description) {
|
|
let file = file.into_inner();
|
|
|
|
event::unregister_file(file.scheme, file.number);
|
|
|
|
let scheme = {
|
|
let schemes = scheme::schemes();
|
|
let scheme = schemes.get(file.scheme).ok_or(Error::new(EBADF))?;
|
|
scheme.clone()
|
|
};
|
|
scheme.close(file.number)
|
|
} else {
|
|
Ok(0)
|
|
}
|
|
}
|
|
}
|