71 lines
1.4 KiB
Rust
71 lines
1.4 KiB
Rust
// SPDX-License-Identifier: MPL-2.0
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use device_id::{DeviceId, MajorId, MinorId};
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use crate::{
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events::IoEvents,
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fs::{
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device::{Device, DeviceType},
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inode_handle::FileIo,
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utils::{InodeIo, StatusFlags},
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},
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prelude::*,
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process::signal::{PollHandle, Pollable},
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};
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pub struct Full;
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impl Device for Full {
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fn type_(&self) -> DeviceType {
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DeviceType::Char
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}
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fn id(&self) -> DeviceId {
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// The same value as Linux
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DeviceId::new(MajorId::new(1), MinorId::new(7))
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}
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fn open(&self) -> Result<Box<dyn FileIo>> {
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Ok(Box::new(Self))
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}
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}
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impl Pollable for Full {
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fn poll(&self, mask: IoEvents, _poller: Option<&mut PollHandle>) -> IoEvents {
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let events = IoEvents::IN | IoEvents::OUT;
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events & mask
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}
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}
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impl InodeIo for Full {
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fn read_at(
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&self,
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_offset: usize,
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writer: &mut VmWriter,
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_status_flags: StatusFlags,
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) -> Result<usize> {
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let len = writer.avail();
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writer.fill_zeros(len)?;
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Ok(len)
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}
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fn write_at(
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&self,
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_offset: usize,
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_reader: &mut VmReader,
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_status_flags: StatusFlags,
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) -> Result<usize> {
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return_errno_with_message!(Errno::ENOSPC, "no space left on /dev/full")
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}
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}
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impl FileIo for Full {
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fn check_seekable(&self) -> Result<()> {
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Ok(())
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}
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fn is_offset_aware(&self) -> bool {
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false
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}
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}
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