Add termios read/write file

src/termios.rs

@@ -0,0 +1,102 @@
+use std::cell::RefCell;
+use std::ops::{Deref, DerefMut};
+use std::rc::Weak;
+
+use syscall::error::{Error, Result, EBADF, EINVAL, EPIPE};
+use syscall::flag::{F_GETFL, F_SETFL, O_ACCMODE};
+
+use pty::Pty;
+use resource::Resource;
+
+/// Read side of a pipe
+#[derive(Clone)]
+pub struct PtyTermios {
+    pty: Weak<RefCell<Pty>>,
+    flags: usize,
+}
+
+impl PtyTermios {
+    pub fn new(pty: Weak<RefCell<Pty>>, flags: usize) -> Self {
+        PtyTermios {
+            pty: pty,
+            flags: flags,
+        }
+    }
+}
+
+impl Resource for PtyTermios {
+    fn boxed_clone(&self) -> Box<Resource> {
+        Box::new(self.clone())
+    }
+
+    fn pty(&self) -> Weak<RefCell<Pty>> {
+        self.pty.clone()
+    }
+
+    fn flags(&self) -> usize {
+        self.flags
+    }
+
+    fn path(&self, buf: &mut [u8]) -> Result<usize> {
+        if let Some(pty_lock) = self.pty.upgrade() {
+            pty_lock.borrow_mut().path(buf)
+        } else {
+            Err(Error::new(EPIPE))
+        }
+    }
+
+    fn read(&self, buf: &mut [u8]) -> Result<usize> {
+        if let Some(pty_lock) = self.pty.upgrade() {
+            let pty = pty_lock.borrow();
+            let termios: &[u8] = pty.termios.deref();
+
+            let mut i = 0;
+            while i < buf.len() && i < termios.len() {
+                buf[i] = termios[i];
+                i += 1;
+            }
+            Ok(i)
+        } else {
+            Ok(0)
+        }
+    }
+
+    fn write(&self, buf: &[u8]) -> Result<usize> {
+        if let Some(pty_lock) = self.pty.upgrade() {
+            let mut pty = pty_lock.borrow_mut();
+            let termios: &mut [u8] = pty.termios.deref_mut();
+
+            let mut i = 0;
+            while i < buf.len() && i < termios.len() {
+                termios[i] = buf[i];
+                i += 1;
+            }
+            Ok(i)
+        } else {
+            Err(Error::new(EPIPE))
+        }
+    }
+
+    fn sync(&self) -> Result<usize> {
+        Ok(0)
+    }
+
+    fn fcntl(&mut self, cmd: usize, arg: usize) -> Result<usize> {
+        match cmd {
+            F_GETFL => Ok(self.flags),
+            F_SETFL => {
+                self.flags = (self.flags & O_ACCMODE) | (arg & ! O_ACCMODE);
+                Ok(0)
+            },
+            _ => Err(Error::new(EINVAL))
+        }
+    }
+
+    fn fevent(&self) -> Result<()> {
+        Err(Error::new(EBADF))
+    }
+
+    fn fevent_count(&self) -> Option<usize> {
+        None
+    }
+}