#!/usr/bin/env python3
"""Cycle the emulated USB audio device (unplug/replug) while the guest
hammer runs, driving uaudio detach/attach -> pcm mixer_uninit frees the
mixer lock while uaudio mixer sysctls are still registered."""
import socket, time, sys
sock = "dfbsd-qemu/boot-mon.sock"
cycles = int(sys.argv[1]) if len(sys.argv) > 1 else 40
s = socket.socket(socket.AF_UNIX, socket.SOCK_STREAM)
s.connect(sock)
time.sleep(0.2); s.recv(65536)
def mon(cmd, wait=0.4):
    s.send((cmd + "\n").encode()); time.sleep(wait)
    try:
        d = s.recv(1 << 20).decode(errors="replace")
    except Exception:
        d = ""
    return d
for n in range(cycles):
    r1 = mon("device_del usbaud0", 1.2)
    r2 = mon("device_add usb-audio,bus=uhci0.0,audiodev=snd0,id=usbaud0", 1.8)
    print("cycle %d: del=%s add=%s" % (n, r1.strip().splitlines()[-1:] , r2.strip().splitlines()[-1:]), flush=True)
    # wait for guest re-attach
    time.sleep(0.8)
s.close()