Red Bear OS
87 lines
2.4 KiB
Rust
87 lines
2.4 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-only resource exposing the PTY's numeric id.
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///
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/// relibc's `ptsname`/`ptsname_r` resolve the subterminal path via the
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/// `TIOCGPTN` ioctl, which does `dup(master, "ptsname")` and reads a
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/// `c_int` (4 bytes) — the PTS number — then formats `/scheme/pty/<n>`.
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/// Without this handler ptyd's `dup` returned `EINVAL` for "ptsname", so
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/// `ptsname` failed, getty resolved a bogus slave path, and it panicked
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/// with "failed to open slave stdin: No such file or directory". Because
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/// `Pty::id` is also the master's scheme handle id, returning it here makes
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/// the subsequent `/scheme/pty/<n>` slave open resolve to the right master.
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pub struct PtyPtsname {
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pty: Weak<RefCell<Pty>>,
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flags: usize,
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}
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impl PtyPtsname {
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pub fn new(pty: Weak<RefCell<Pty>>, flags: usize) -> Self {
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PtyPtsname { pty, flags }
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}
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}
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impl Resource for PtyPtsname {
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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<usize> {
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if let Some(pty_lock) = self.pty.upgrade() {
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let id = pty_lock.borrow().id as i32;
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let bytes = id.to_ne_bytes();
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let n = core::cmp::min(buf.len(), bytes.len());
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buf[..n].copy_from_slice(&bytes[..n]);
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Ok(n)
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} else {
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Ok(0)
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}
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}
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fn write(&mut self, _buf: &[u8]) -> Result<usize> {
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Err(Error::new(EINVAL))
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}
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fn sync(&mut self) -> Result<()> {
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Ok(())
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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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