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# Summary Unix-socket app-server startup can currently race when multiple launch attempts target the same `CODEX_HOME`. Those processes can overlap before the control socket exists, which lets them enter SQLite state initialization concurrently and reproduce the startup corruption pattern seen in SSH mode. This change makes the app-server own that singleton startup guarantee. Unix-socket startup now takes a `CODEX_HOME`-scoped advisory lock before SQLite initialization, runs the existing control-socket preparation check while holding that lock, returns the established `AddrInUse` error when another live listener already owns the socket, and releases the lock once the new listener has bound its socket. # Design decisions - The singleton rule lives in `app-server --listen unix://`, not in a desktop-only caller path, so every Unix-socket launch gets the same race protection. - A duplicate raw app-server launch returns an error instead of silently succeeding. The attach operation remains `app-server proxy`, which continues to connect to an already-running listener. - The lock is held only across the dangerous startup window: socket preparation, SQLite initialization, and socket bind. It is not held for the app-server lifetime. - Listener detection stays in `prepare_control_socket_path(...)`, so the preexisting live-listener and stale-socket behavior remains the single source of truth. # Testing Tests: targeted Unix-socket transport tests on the branch checkout, full `codex-cli` build on `efrazer-db10`, and an SSH-style smoke on `efrazer-db10` covering concurrent app-server starts, explicit duplicate-start errors, and absence of SQLite startup-error matches in launch logs.
npm i -g @openai/codex
or brew install --cask codex
Codex CLI is a coding agent from OpenAI that runs locally on your computer.
If you want Codex in your code editor (VS Code, Cursor, Windsurf), install in your IDE.
If you want the desktop app experience, run
codex app or visit the Codex App page.
If you are looking for the cloud-based agent from OpenAI, Codex Web, go to chatgpt.com/codex.
Quickstart
Installing and running Codex CLI
Install globally with your preferred package manager:
# Install using npm
npm install -g @openai/codex
# Install using Homebrew
brew install --cask codex
Then simply run codex to get started.
You can also go to the latest GitHub Release and download the appropriate binary for your platform.
Each GitHub Release contains many executables, but in practice, you likely want one of these:
- macOS
- Apple Silicon/arm64:
codex-aarch64-apple-darwin.tar.gz - x86_64 (older Mac hardware):
codex-x86_64-apple-darwin.tar.gz
- Apple Silicon/arm64:
- Linux
- x86_64:
codex-x86_64-unknown-linux-musl.tar.gz - arm64:
codex-aarch64-unknown-linux-musl.tar.gz
- x86_64:
Each archive contains a single entry with the platform baked into the name (e.g., codex-x86_64-unknown-linux-musl), so you likely want to rename it to codex after extracting it.
Using Codex with your ChatGPT plan
Run codex and select Sign in with ChatGPT. We recommend signing into your ChatGPT account to use Codex as part of your Plus, Pro, Business, Edu, or Enterprise plan. Learn more about what's included in your ChatGPT plan.
You can also use Codex with an API key, but this requires additional setup.
Docs
This repository is licensed under the Apache-2.0 License.