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small gleam coding and persistent agent daemon with a detachable cli and a canvas ui forked from okami.mom/albedo
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albedo_zygote.py <socket-path>
Imports what a spare imports, freezes the heap so children share its pages,prints `{"ready": bundle}`, then forks one child per connection to the unixsocket. The child serves albedo_spare's stdio protocol over that connection.The zygote stays single-threaded, so forking is safe; it exits on stdin EOF(its owner closed the port) or once the bundle changes under it."""
from __future__ import annotations
import asyncioimport contextlibimport gcimport jsonimport osimport selectimport signalimport socketimport sysimport tracebackfrom typing import Any
import albedo_bundleimport albedo_cellsimport albedo_procimport albedo_spare
def child(connection: socket.socket, bundle: str) -> None: os.dup2(connection.fileno(), 0) os.dup2(connection.fileno(), 1) connection.close() signal.signal(signal.SIGCHLD, signal.SIG_DFL) # Every child needs its own selector. Closing the inherited loop would # unregister its self-pipe from the epoll set the zygote shares, so only # this process's copies of its descriptors are dropped (macOS does not # inherit a kqueue at all). inherited: Any = albedo_cells.LOOP for resource in (inherited._ssock, inherited._csock, inherited._selector._selector): with contextlib.suppress(OSError, ValueError): resource.close() albedo_cells.LOOP = asyncio.new_event_loop() asyncio.set_event_loop(albedo_cells.LOOP) albedo_proc.reap_stopped_safely(albedo_cells.LOOP) albedo_spare.main(bundle)
def main(path: str) -> None: if os.getpgrp() != os.getpid(): os.setsid() bundle = albedo_spare.preimport() listener = socket.socket(socket.AF_UNIX, socket.SOCK_STREAM) directory, name = os.path.split(path) os.chdir(directory) if os.path.exists(name): os.unlink(name) listener.bind(name) os.chmod(name, 0o600) listener.listen(64) # Children are reaped by the kernel; each resets this before running code. signal.signal(signal.SIGCHLD, signal.SIG_IGN) gc.collect() gc.freeze() print(json.dumps({"ready": bundle, "pid": os.getpid()}), flush=True) while True: readable, _, _ = select.select([listener, 0], [], []) if 0 in readable and not os.read(0, 4096): return if listener not in readable: continue connection, _ = listener.accept() if albedo_bundle.digest() != bundle: connection.close() return if os.fork() == 0: listener.close() try: child(connection, bundle) except BaseException: traceback.print_exc() finally: os._exit(1) connection.close()
if __name__ == "__main__": main(sys.argv[1])