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/// An allocated pty
pub struct Pty {
pt: std::fs::File,
pts: std::fs::File,
}
impl Pty {
/// Allocate and return a new pty.
///
/// # Errors
/// Returns an error if the pty failed to be allocated.
pub fn new() -> crate::Result<Self> {
let (pt, ptsname) = crate::sys::create_pt()?;
let pts = std::fs::OpenOptions::new()
.read(true)
.write(true)
.open(&ptsname)?;
Ok(Self { pt, pts })
}
/// Change the terminal size associated with the pty.
///
/// # Errors
/// Returns an error if we were unable to set the terminal size.
pub fn resize(&self, size: crate::Size) -> crate::Result<()> {
Ok(crate::sys::set_term_size(self, size)?)
}
pub(crate) fn pts(&self) -> &std::fs::File {
&self.pts
}
}
impl std::ops::Deref for Pty {
type Target = std::fs::File;
fn deref(&self) -> &Self::Target {
&self.pt
}
}
impl std::ops::DerefMut for Pty {
fn deref_mut(&mut self) -> &mut Self::Target {
&mut self.pt
}
}
impl std::os::unix::io::AsRawFd for Pty {
fn as_raw_fd(&self) -> std::os::unix::io::RawFd {
self.pt.as_raw_fd()
}
}
// there is a Read impl for &std::fs::File, but without this explicit impl,
// rust finds the Read impl for std::fs::File first, and then complains that
// it requires &mut self, because method resolution/autoderef doesn't take
// mutability into account
impl std::io::Read for &Pty {
fn read(&mut self, buf: &mut [u8]) -> std::io::Result<usize> {
(&self.pt).read(buf)
}
}
// same as above
impl std::io::Write for &Pty {
fn write(&mut self, buf: &[u8]) -> std::io::Result<usize> {
(&self.pt).write(buf)
}
fn flush(&mut self) -> std::io::Result<()> {
(&self.pt).flush()
}
}
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