Enforce causal child acquisition boundaries

crates/lazaret-linux/tests/sa_nocldwait.py

@@ -0,0 +1,21 @@
+import os
+import pathlib
+import subprocess
+import sys
+import tempfile
+
+
+source = pathlib.Path(__file__).with_suffix(".c")
+with tempfile.TemporaryDirectory(prefix="lazaret-sa-nocldwait-") as directory:
+    preload = pathlib.Path(directory) / "sa_nocldwait.so"
+    subprocess.run(
+        ["cc", "-shared", "-fPIC", "-o", preload, source],
+        check=True,
+    )
+    environment = os.environ.copy()
+    environment["LD_PRELOAD"] = str(preload)
+    result = subprocess.run(
+        [sys.argv[1], "--run-acquisition", "success", sys.argv[2]],
+        env=environment,
+    )
+    raise SystemExit(result.returncode)