# Server.serverProcessID()

- **Module:** Server
- **Package:** libtmux-swift
- **Language:** Swift
- **Kind:** method
- **Source:** https://github.com/libtmux/libtmux-swift/blob/254f8b2be7eb60cacc3ffcb3ea8e456784f582df/Sources/LibTmux/Server.swift#L312
- **Page:** https://libtmux.org/en/swift/latest/reference/server-serverprocessid()/

```
Server.serverProcessID()() -> Int
```

The running server's process id.

A restart changes it, which is what lets a multi-command capture prove
it came from one server.

## Raises

- `TmuxError`