openai/codex · error · std::io::Error

too many fds: {}

Error message

too many fds: {}

What it means

Error "too many fds: {}" thrown in openai/codex.

Source

Thrown at codex-rs/shell-escalation/src/unix/socket.rs:212

            ),
        ));
    }
    Ok(())
}

fn encode_length(len: usize) -> std::io::Result<[u8; LENGTH_PREFIX_SIZE]> {
    let len_u32 = u32::try_from(len).map_err(|_| {
        std::io::Error::new(
            std::io::ErrorKind::InvalidInput,
            format!("message too large: {len}"),
        )
    })?;
    Ok(len_u32.to_le_bytes())
}

fn make_control_message(fds: &[OwnedFd]) -> std::io::Result<Vec<u8>> {
    if fds.len() > MAX_FDS_PER_MESSAGE {
        Err(std::io::Error::new(
            std::io::ErrorKind::InvalidInput,
            format!("too many fds: {}", fds.len()),
        ))
    } else if fds.is_empty() {
        Ok(Vec::new())
    } else {
        let mut control = vec![0u8; control_space_for_fds(fds.len())];
        unsafe {
            let cmsg = control.as_mut_ptr().cast::<libc::cmsghdr>();
            (*cmsg).cmsg_len =
                libc::CMSG_LEN(size_of::<RawFd>() as c_uint * fds.len() as c_uint) as _;
            (*cmsg).cmsg_level = libc::SOL_SOCKET;
            (*cmsg).cmsg_type = libc::SCM_RIGHTS;
            let data_ptr = libc::CMSG_DATA(cmsg).cast::<RawFd>();
            for (i, fd) in fds.iter().enumerate() {
                data_ptr.add(i).write(fd.as_raw_fd());
            }
        }

View on GitHub (pinned to 339751715c)

When it happens

Trigger: Thrown at codex-rs/shell-escalation/src/unix/socket.rs:212 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/880ca3acf434a054. Report an issue: GitHub.