Jeremy Soller
108 lines
2.3 KiB
Rust
108 lines
2.3 KiB
Rust
use std::cell::RefCell;
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use std::rc::{Rc, Weak};
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use syscall::error::{Error, Result, EINVAL, EWOULDBLOCK};
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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 PtyMaster {
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pty: Rc<RefCell<Pty>>,
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flags: usize,
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}
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impl PtyMaster {
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pub fn new(pty: Rc<RefCell<Pty>>, flags: usize) -> Self {
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PtyMaster {
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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 PtyMaster {
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fn boxed_clone(&self) -> Box<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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Rc::downgrade(&self.pty)
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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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self.pty.borrow_mut().path(buf)
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}
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fn read(&self, buf: &mut [u8]) -> Result<usize> {
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let mut pty = self.pty.borrow_mut();
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if let Some(packet) = pty.miso.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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Ok(i)
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} else if self.flags & O_NONBLOCK == O_NONBLOCK || Rc::weak_count(&self.pty) == 0 {
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Ok(0)
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} else {
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Err(Error::new(EWOULDBLOCK))
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}
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}
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fn write(&self, buf: &[u8]) -> Result<usize> {
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let mut pty = self.pty.borrow_mut();
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let mut i = 0;
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while i < buf.len() {
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pty.mosi.push_back(buf[i]);
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i += 1;
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}
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Ok(i)
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}
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fn sync(&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(&self) -> Result<()> {
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Ok(())
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}
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fn fevent_count(&self) -> Option<usize> {
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{
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let pty = self.pty.borrow();
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if let Some(data) = pty.miso.front() {
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return Some(data.len());
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}
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}
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if Rc::weak_count(&self.pty) == 0 {
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Some(0)
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} else {
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None
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}
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}
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}
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