Problems with the old code:
* Insufficient error checking.
* It used TIOCNOTTY (obsolete BSDism) to get rid of the controlling
tty, except for hpux || Rel4, where it attempted to use the POSIX
way, but screwed up.
* It left file descriptors 0, 1, 2 in a somewhat weird state.
when it runs as daemon, because it relies on player_socket remaining
open across disassoc(). Change disassoc() to only close file
descriptors 0..2 instead of 0..9. By the way, it should really
redirect 0..2 to /dev/null instead.
