## Why
Sandboxed commands inherit the user's controlling terminal. Without an explicit
restriction, a child can use `TIOCSTI` to queue input for the unsandboxed shell
that resumes after Codex exits.
## What changed
Append a `file-ioctl` denial for `TIOCSTI` after the shared Seatbelt policy
allowances used by `codex sandbox`.
## Testing
Add a macOS PTY integration test that first proves terminal input injection
works without the sandbox, then verifies Seatbelt rejects it with `EPERM`.
GitOrigin-RevId: 5a8b0a5b4fd980cc406ad184d04ceae9b0ea90e4
