Ian Douglas Scott
52 lines
1.4 KiB
Rust
52 lines
1.4 KiB
Rust
//! File structs
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use alloc::arc::Arc;
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use spin::RwLock;
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use scheme::{self, SchemeId};
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use core::mem;
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use syscall::error::{Result, Error, EBADF};
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use scheme::FileHandle;
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use context;
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/// A file description
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#[derive(Debug)]
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pub struct FileDescription {
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/// The scheme that this file refers to
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pub scheme: SchemeId,
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/// The number the scheme uses to refer to this file
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pub number: usize,
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/// The flags passed to open or fcntl(SETFL)
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pub flags: usize,
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}
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/// A file descriptor
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#[derive(Clone, Debug)]
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pub struct FileDescriptor {
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/// Corresponding file description
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pub description: Arc<RwLock<FileDescription>>,
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/// If events are on, this is the event ID
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pub event: Option<usize>,
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/// Cloexec flag
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pub cloexec: bool,
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}
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impl FileDescriptor {
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pub fn close(self, fd: FileHandle) -> Result<usize> {
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if let Some(event_id) = self.event {
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context::event::unregister(fd, self.description.read().scheme, event_id);
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}
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if let Ok(file) = Arc::try_unwrap(self.description) {
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let file = file.into_inner();
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let scheme = {
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let schemes = scheme::schemes();
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let scheme = schemes.get(file.scheme).ok_or(Error::new(EBADF))?;
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scheme.clone()
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};
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scheme.close(file.number)
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} else {
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Ok(0)
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}
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}
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}
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