# LibTmux::Attachment.when-exited

- **Module:** LibTmux
- **Package:** LibTmux
- **Language:** Raku
- **Kind:** method
- **Source:** https://github.com/libtmux/libtmux-raku/blob/0b5dd3d32e20f83a0069874e33eab0eb48f55962/lib/LibTmux/Attachment.rakumod#L193
- **Page:** https://libtmux.org/en/raku/latest/reference/libtmux-attachment-when-exited/

```
method when-exited(--> Promise:D)
```

Resolve after the child exits and stderr is drained, preserving its exit status.

Resolve after the child exits and stderr is drained, preserving its exit status.