# Spawn/wait fixture

This deterministic AArch64 Linux fixture uses the runtime's constrained
`clone(CLONE_VM | CLONE_VFORK | SIGCHLD)` mode. The child verifies PID 2 and
parent PID 1, writes `child`, and exits 7. The restored parent verifies PID 1,
reaps PID 2 with `wait4`, checks the encoded exit status, writes `parent`, and
exits zero.

Rebuild it from the repository root while keeping the Zig cache local:

```sh
TMPDIR="$PWD/.tmp" guest-tests/spawn-wait/build.sh
```