openai/codex · error

failed to openpty: {:?}

Error message

failed to openpty: {:?}

What it means

Error "failed to openpty: {:?}" thrown in openai/codex.

Source

Thrown at codex-rs/utils/pty/src/pty.rs:448

    let mut size = libc::winsize {
        ws_row: size.rows,
        ws_col: size.cols,
        ws_xpixel: 0,
        ws_ypixel: 0,
    };
    let winp = std::ptr::addr_of_mut!(size);

    let result = unsafe {
        libc::openpty(
            &mut master,
            &mut slave,
            std::ptr::null_mut(),
            std::ptr::null_mut(),
            winp,
        )
    };
    if result != 0 {
        anyhow::bail!("failed to openpty: {:?}", std::io::Error::last_os_error());
    }

    set_cloexec(master)?;
    set_cloexec(slave)?;

    Ok(unsafe { (File::from_raw_fd(master), File::from_raw_fd(slave)) })
}

#[cfg(unix)]
fn set_cloexec(fd: RawFd) -> std::io::Result<()> {
    let flags = unsafe { libc::fcntl(fd, libc::F_GETFD) };
    if flags == -1 {
        return Err(std::io::Error::last_os_error());
    }
    let result = unsafe { libc::fcntl(fd, libc::F_SETFD, flags | libc::FD_CLOEXEC) };
    if result == -1 {
        return Err(std::io::Error::last_os_error());
    }

View on GitHub (pinned to 339751715c)

When it happens

Trigger: Thrown at codex-rs/utils/pty/src/pty.rs:448 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of openai/codex@339751715c (2026-08-25). Data as JSON: /api/errors/fd3c00e2251916d0. Report an issue: GitHub.