bjorn3
93 lines
2.3 KiB
Rust
93 lines
2.3 KiB
Rust
use std::cell::RefCell;
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use std::rc::Weak;
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use syscall::error::{Error, Result, EBADF, EINVAL, EPIPE};
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use syscall::flag::{EventFlags, F_GETFL, F_SETFL, O_ACCMODE};
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use crate::pty::Pty;
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use crate::resource::Resource;
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/// Read side of a pipe
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pub struct PtyPgrp {
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pty: Weak<RefCell<Pty>>,
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flags: usize,
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}
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impl PtyPgrp {
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pub fn new(pty: Weak<RefCell<Pty>>, flags: usize) -> Self {
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PtyPgrp {
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pty: pty,
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flags: flags,
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}
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}
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}
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impl Resource for PtyPgrp {
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fn pty(&self) -> Weak<RefCell<Pty>> {
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self.pty.clone()
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}
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fn flags(&self) -> usize {
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self.flags
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}
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fn path(&mut self, buf: &mut [u8]) -> Result<usize> {
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if let Some(pty_lock) = self.pty.upgrade() {
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pty_lock.borrow_mut().path(buf)
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} else {
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Err(Error::new(EPIPE))
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}
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}
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fn read(&mut self, buf: &mut [u8]) -> Result<Option<usize>> {
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if let Some(pty_lock) = self.pty.upgrade() {
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let pty = pty_lock.borrow();
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//println!("READ PGRP {}: {}", pty.id, pty.pgrp);
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let dst_buf = buf.get_mut(..4).and_then(|b| <&mut [u8; 4]>::try_from(b).ok()).ok_or(Error::new(EBADF))?;
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*dst_buf = (pty.pgrp as u32).to_ne_bytes();
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Ok(Some(4))
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} else {
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Ok(Some(0))
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}
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}
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fn write(&mut self, buf: &[u8]) -> Result<Option<usize>> {
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if let Some(pty_lock) = self.pty.upgrade() {
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let mut pty = pty_lock.borrow_mut();
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let new_pgrp = u32::from_ne_bytes(buf.get(..4).and_then(|b| <[u8; 4]>::try_from(b).ok()).ok_or(Error::new(EBADF))?);
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pty.pgrp = new_pgrp as usize;
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//println!("WRITE PGRP {}: {} => {}", pty.id, pty.pgrp, new_pgrp);
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Ok(Some(4))
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} else {
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Err(Error::new(EPIPE))
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}
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}
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fn sync(&mut self) -> Result<usize> {
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Ok(0)
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}
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fn fcntl(&mut self, cmd: usize, arg: usize) -> Result<usize> {
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match cmd {
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F_GETFL => Ok(self.flags),
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F_SETFL => {
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self.flags = (self.flags & O_ACCMODE) | (arg & !O_ACCMODE);
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Ok(0)
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}
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_ => Err(Error::new(EINVAL)),
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}
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}
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fn fevent(&mut self) -> Result<EventFlags> {
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Err(Error::new(EBADF))
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}
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fn events(&mut self) -> EventFlags {
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EventFlags::empty()
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}
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}
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