Unified shutdown and init to use 3 second wait between SIGTERM and

SIGKILL. Defined this value in init.h (WAIT_BETWEEN_SIGNALS) for
easy modification.
Updated documentation to address Debian bug #375274.

src/init.c

@@ -133,7 +133,7 @@ int wrote_wtmp_reboot = 1;	/* Set when we wrote the reboot record */
 int wrote_utmp_reboot = 1;	/* Set when we wrote the reboot record */
 int wrote_wtmp_rlevel = 1;	/* Set when we wrote the runlevel record */
 int wrote_utmp_rlevel = 1;	/* Set when we wrote the runlevel record */
-int sltime = 5;			/* Sleep time between TERM and KILL */
+int sltime = WAIT_BETWEEN_SIGNALS;    /* Sleep time between TERM and KILL */
 char *argv0;			/* First arguments; show up in ps listing */
 int maxproclen;			/* Maximal length of argv[0] with \0 */
 struct utmp utproto;		/* Only used for sizeof(utproto.ut_id) */

src/init.h

@@ -33,6 +33,7 @@
 #define INITPID	   1			/* pid of first process */
 #define PIPE_FD    10			/* Fileno of initfifo. */
 #define STATE_PIPE 11			/* used to pass state through exec */
+#define WAIT_BETWEEN_SIGNALS 3        /* default time to wait between TERM and KILL */
 
 /* Failsafe configuration */
 #define MAXSPAWN   10			/* Max times respawned in.. */

src/shutdown.c

@@ -348,7 +348,7 @@ void fastdown()
 	/* Kill all processes. */
 	fprintf(stderr, "shutdown: sending all processes the TERM signal...\r\n");
 	kill(-1, SIGTERM);
-	sleep(sltime ? atoi(sltime) : 3);
+	sleep(sltime ? atoi(sltime) : WAIT_BETWEEN_SIGNALS);
 	fprintf(stderr, "shutdown: sending all processes the KILL signal.\r\n");
 	(void) kill(-1, SIGKILL);