43 lines
1.1 KiB
Python
43 lines
1.1 KiB
Python
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#!/usr/bin/env python3
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"""L3 probe for the bootstrap slice.
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Runs under ``swactor.run`` and reports facts observable without any
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data-plane primitives: context shape, wake readability, and descriptor
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hygiene across an exec boundary.
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"""
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from __future__ import annotations
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import os
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import select
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import subprocess
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import sys
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import swactor
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_CHILD_CHECK = (
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"import os, sys; "
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"sys.exit(0 if sys.argv[1] not in os.listdir('/proc/self/fd') else 3)"
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)
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async def main(ctx: swactor.Context) -> None:
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facts = [f"HAS_DATA={int(isinstance(ctx.data, swactor.DataPlane))}"]
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wake = int(os.environ["SWACTOR_WAKE_FD"])
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readable = bool(select.select([wake], [], [], 0)[0])
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facts.append(f"WAKE_READABLE={int(readable)}")
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# B5: a close_fds=False child must not see the CLOEXEC-armed wake fd.
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child = subprocess.Popen(
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[sys.executable, "-c", _CHILD_CHECK, str(wake)],
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close_fds=False,
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)
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child.wait()
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facts.append(f"WAKE_LEAKED={int(child.returncode == 3)}")
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print(" ".join(facts))
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if __name__ == "__main__":
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swactor.run(main)
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