Jeremy Soller
146 lines
3.5 KiB
Rust
146 lines
3.5 KiB
Rust
use std::cell::RefCell;
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use std::rc::Weak;
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use syscall::error::{Error, Result, EINVAL, EPIPE, EAGAIN};
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use syscall::flag::{F_GETFL, F_SETFL, O_ACCMODE, O_NONBLOCK};
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use pty::Pty;
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use resource::Resource;
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/// Read side of a pipe
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#[derive(Clone)]
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pub struct PtySlave {
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pty: Weak<RefCell<Pty>>,
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flags: usize,
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notified_read: bool,
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notified_write: bool
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}
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impl PtySlave {
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pub fn new(pty: Weak<RefCell<Pty>>, flags: usize) -> Self {
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PtySlave {
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pty: pty,
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flags: flags,
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notified_read: false,
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notified_write: false
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}
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}
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}
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impl Resource for PtySlave {
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fn boxed_clone(&self) -> Box<dyn Resource> {
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Box::new(self.clone())
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}
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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(&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(&self, buf: &mut [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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if let Some(packet) = pty.mosi.pop_front() {
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let mut i = 0;
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while i < buf.len() && i < packet.len() {
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buf[i] = packet[i];
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i += 1;
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}
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if i < packet.len() {
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pty.mosi.push_front(packet[i..].to_vec());
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}
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Ok(Some(i))
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} else if self.flags & O_NONBLOCK == O_NONBLOCK {
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Err(Error::new(EAGAIN))
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} else {
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Ok(None)
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}
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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(&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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if pty.miso.len() >= 64 {
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return Ok(None);
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}
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pty.output(buf);
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Ok(Some(buf.len()))
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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(&self) -> Result<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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pty.miso.push_back(vec![1]);
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Ok(0)
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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 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<usize> {
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self.notified_read = false; // resend
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self.notified_write = false;
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Ok(self.events())
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}
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fn events(&mut self) -> usize {
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let mut events = 0;
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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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if pty.mosi.front().is_some() {
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if !self.notified_read {
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self.notified_read = true;
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events |= syscall::EVENT_READ;
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}
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} else {
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self.notified_read = false;
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}
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}
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if ! self.notified_write {
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self.notified_write = true;
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events |= syscall::EVENT_WRITE;
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}
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events
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}
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}
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