$ cc -O2 -Wall -o joy_open_race joy_open_race.c
exit=0
$ cc -O2 -Wall -o joy_crit_loop joy_crit_loop.c
exit=0

$ ./joy_open_race
open /dev/joy0: No such file or directory (errno=2)
joy(4) not attached on this machine -- cannot exercise joyopen() race
exit=2

$ ./joy_crit_loop
open /dev/joy0: No such file or directory (errno=2)
joy(4) not attached on this machine -- cannot exercise joyread() crit loop
exit=2

$ ls /dev/joy*
ls: /dev/joy*: No such file or directory
$ kldload joy && ls /dev/joy*
ls: /dev/joy*: No such file or directory
unload_exit=0