zellij-org/zellij · error

failed to find terminal fd for id {terminal_id}

Error message

failed to find terminal fd for id {terminal_id}

What it means

Error "failed to find terminal fd for id {terminal_id}" thrown in zellij-org/zellij.

Source

Thrown at zellij-server/src/os_input_output_unix.rs:377

            format!(
                "failed to set terminal id {} to size ({}, {})",
                terminal_id, rows, cols
            )
        };
        match self
            .terminal_id_to_raw_fd
            .lock()
            .to_anyhow()
            .with_context(err_context)?
            .get(&terminal_id)
        {
            Some(Some(fd)) => {
                if cols > 0 && rows > 0 {
                    set_terminal_size_using_fd(*fd, cols, rows, width_in_pixels, height_in_pixels);
                }
            },
            _ => {
                Err::<(), _>(anyhow!("failed to find terminal fd for id {terminal_id}"))
                    .with_context(err_context)
                    .non_fatal();
            },
        }
        Ok(())
    }

    pub fn write_to_tty_stdin(&self, terminal_id: u32, buf: &[u8]) -> Result<usize> {
        let err_context = || format!("failed to write to stdin of TTY ID {}", terminal_id);

        let fd = match self
            .terminal_id_to_raw_fd
            .lock()
            .to_anyhow()
            .with_context(err_context)?
            .get(&terminal_id)
        {
            Some(Some(fd)) => *fd,

View on GitHub (pinned to 5cb5df5cce)

Solutions

1. Check system resource limits (open files, processes) and the OS error attached to the failure.
2. Retry the operation; if persistent, report the OS error with a zellij issue.

When it happens

Trigger: Occurs at zellij-server/src/os_input_output_unix.rs:377 when the operation fails: "failed to find terminal fd for id {terminal_id}". Currently there is no defensive handling preventing or contextualizing this failure before it surfaces.

Common situations: Typically resource exhaustion, invalid fd state, or platform-specific pty limitations.

AI-assisted analysis of zellij-org/zellij@5cb5df5cce (2026-08-19). Data as JSON: /api/errors/e9d04151725d4cb5. Report an issue: GitHub.