Jeremy Soller
126 lines
3.4 KiB
Rust
126 lines
3.4 KiB
Rust
use std::collections::BTreeMap;
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use std::cell::RefCell;
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use std::rc::Rc;
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use std::str;
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use syscall::data::Stat;
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use syscall::error::{Error, Result, EBADF, EINVAL, ENOENT};
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use syscall::flag::MODE_CHR;
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use syscall::scheme::SchemeMut;
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use master::PtyMaster;
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use pty::Pty;
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use resource::Resource;
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use slave::PtySlave;
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use termios::PtyTermios;
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pub struct PtyScheme {
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next_id: usize,
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pub handles: BTreeMap<usize, Box<Resource>>,
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}
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impl PtyScheme {
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pub fn new() -> Self {
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PtyScheme {
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next_id: 0,
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handles: BTreeMap::new(),
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}
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}
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}
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impl SchemeMut for PtyScheme {
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fn open(&mut self, path: &[u8], flags: usize, _uid: u32, _gid: u32) -> Result<usize> {
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let path = str::from_utf8(path).or(Err(Error::new(EINVAL)))?.trim_matches('/');
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if path.is_empty() {
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let id = self.next_id;
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self.next_id += 1;
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let pty = Rc::new(RefCell::new(Pty::new(id)));
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self.handles.insert(id, Box::new(PtyMaster::new(pty, flags)));
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Ok(id)
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} else {
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let master_id = path.parse::<usize>().or(Err(Error::new(EINVAL)))?;
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let pty = {
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let handle = self.handles.get(&master_id).ok_or(Error::new(ENOENT))?;
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handle.pty()
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};
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let id = self.next_id;
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self.next_id += 1;
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self.handles.insert(id, Box::new(PtySlave::new(pty, flags)));
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Ok(id)
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}
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}
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fn dup(&mut self, old_id: usize, buf: &[u8]) -> Result<usize> {
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let handle = {
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let old_handle = self.handles.get(&old_id).ok_or(Error::new(EBADF))?;
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if buf.is_empty() {
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old_handle.boxed_clone()
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} else if buf == b"termios" {
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Box::new(PtyTermios::new(old_handle.pty(), old_handle.flags()))
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} else {
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return Err(Error::new(EINVAL));
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}
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};
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let id = self.next_id;
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self.next_id += 1;
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self.handles.insert(id, handle);
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Ok(id)
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}
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fn read(&mut self, id: usize, buf: &mut [u8]) -> Result<usize> {
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let handle = self.handles.get(&id).ok_or(Error::new(EBADF))?;
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handle.read(buf)
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}
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fn write(&mut self, id: usize, buf: &[u8]) -> Result<usize> {
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let handle = self.handles.get(&id).ok_or(Error::new(EBADF))?;
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handle.write(buf)
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}
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fn fcntl(&mut self, id: usize, cmd: usize, arg: usize) -> Result<usize> {
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let mut handle = self.handles.get_mut(&id).ok_or(Error::new(EBADF))?;
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handle.fcntl(cmd, arg)
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}
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fn fevent(&mut self, id: usize, _flags: usize) -> Result<usize> {
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let handle = self.handles.get(&id).ok_or(Error::new(EBADF))?;
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handle.fevent().and(Ok(id))
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}
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fn fpath(&mut self, id: usize, buf: &mut [u8]) -> Result<usize> {
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let handle = self.handles.get(&id).ok_or(Error::new(EBADF))?;
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handle.path(buf)
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}
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fn fstat(&mut self, id: usize, stat: &mut Stat) -> Result<usize> {
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let _handle = self.handles.get(&id).ok_or(Error::new(EBADF))?;
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*stat = Stat {
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st_mode: MODE_CHR | 0o666,
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..Default::default()
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};
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Ok(0)
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}
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fn fsync(&mut self, id: usize) -> Result<usize> {
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let handle = self.handles.get(&id).ok_or(Error::new(EBADF))?;
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handle.sync()
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}
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fn close(&mut self, id: usize) -> Result<usize> {
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drop(self.handles.remove(&id));
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Ok(0)
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}
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}
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