Include <paths.h>, <error.h>, <sys/wait.h>, and <hurd/msg_reply.h>.

(run_for_real, open_console, process_signal, reboot_mach,
run_for_real, run, reboot_system): Use error instead of fprintf.
(notify_shutdown): Always emit terminating newline.
(S_startup_essential_task): When all core servers have showed up, call
launch_single_user only if RB_SINGLE; otherwise call
process_rc_script.  Call init_stdarrays here.
(open_console): New function; massaged guts taken from
launch_single_user.  Be more verbose if we do something unusual.
(launch_single_user): Call open_console.  Don't call init_stdarrays
here.
(system_state, default_ints): New variables.
(main): Initialize SYSTEM_STATE and DEFAULT_INTS.
(run_for_real): Pass default_ints.
(run): Likewise.
(S_startup_essential_task): Delete var INITDONE; use SYSTEM_STATE
instead.
(launch_single_user): Set SYSTEM_STATE to SINGLE.
(process_rc_script): New function.
(launch_multi_user): New function.
(kill_everyone): New function.
(kill_multi_user): New function.
(do_fastboot, rc_pid, session_pid): New variables.
(process_signal): New function; guts from S_msg_sig_post_untraced.
Handle state transitions here when programs exit.  Process SIGTERM,
and SIGHUP appropriately.
(_PATH_RUNCOM, _PATH_LOGIN): New macros.
(S_msg_sig_post_untraced): Only validate signal here; use
process_signal to do the work, but reply first.
(S_msg_sig_post): Likewise.
(notify_shutdown): New function.
(reboot_system): Use notify_shutdown.

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