# Server.serverProcessID()

- **Module:** Server
- **Package:** libtmux-swift
- **Language:** Swift
- **Kind:** method
- **Source:** https://github.com/libtmux/libtmux-swift/blob/f02a4668570e1cc5198c941413750e021f42c214/Sources/LibTmux/Server.swift#L286
- **Page:** https://libtmux.org/reference/swift/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`