UTMP: Set BOOT_TIME record and add shutdown

This patch adds support for initializing /var/run/utmp with the initial
reboot as well as a shutdown record in the UTMP db.

Also, the run level change now properly records ~ and ~~ as line and id,
respectively, and the kernel release and time of each UTMP record is now
set properly.

Signed-off-by: Joachim Nilsson <troglobit@gmail.com>

sig.c

@@ -78,6 +78,7 @@
 #include "private.h"
 #include "sig.h"
 #include "service.h"
+#include "utmp-api.h"
 
 static int   stopped = 0;
 static uev_t sigterm_watcher, sigusr1_watcher, sigusr2_watcher;
@@ -105,6 +106,9 @@ void do_shutdown(shutop_t op)
 	/* Call all shutdown hooks before rebooting... */
 	plugin_run_hooks(HOOK_SHUTDOWN);
 
+	/* Update UTMP db */
+	utmp_set_halt();
+
 	/* Here is where we signal watchdogd to do a forced reset for us */
 	_d("Sending SIGTERM to all processes.");
 	kill(-1, SIGTERM);