shutdown: Adapt to changes in reboot

Now that halt and reboot actually signal init, shutdown needs to run
fasthalt or fastboot instead when given the -o option.

MFC after:	1 month
Reviewed by:	imp, allanjude
Differential Revision:	https://reviews.freebsd.org/D54122

sbin/shutdown/shutdown.8

@@ -105,9 +105,9 @@ or
 options is specified,
 .Nm
 will execute
-.Xr halt 8
+.Xr fasthalt 8
 or
-.Xr reboot 8
+.Xr fastboot 8
 instead of sending a signal to
 .Xr init 8 .
 .It Fl n
@@ -116,9 +116,9 @@ If the
 option is specified, prevent the file system cache from being flushed by passing
 .Fl n
 to
-.Xr halt 8
+.Xr fasthalt 8
 or
-.Xr reboot 8 .
+.Xr fastboot 8 .
 This option should probably not be used.
 .It Fl q
 Shut down quietly.

sbin/shutdown/shutdown.c

@@ -407,7 +407,7 @@ die_you_gravy_sucking_pig_dog(void)
 	} else {
 		if (doreboot) {
 			BOOTTRACE("exec reboot(8) -l...");
-			execle(_PATH_REBOOT, "reboot", "-l", nosync, 
+			execle(_PATH_REBOOT, "fastboot", "-l", nosync,
 				(char *)NULL, empty_environ);
 			syslog(LOG_ERR, "shutdown: can't exec %s: %m.",
 				_PATH_REBOOT);
@@ -415,7 +415,7 @@ die_you_gravy_sucking_pig_dog(void)
 		}
 		else if (dohalt) {
 			BOOTTRACE("exec halt(8) -l...");
-			execle(_PATH_HALT, "halt", "-l", nosync,
+			execle(_PATH_HALT, "fasthalt", "-l", nosync,
 				(char *)NULL, empty_environ);
 			syslog(LOG_ERR, "shutdown: can't exec %s: %m.",
 				_PATH_HALT);
@@ -423,14 +423,14 @@ die_you_gravy_sucking_pig_dog(void)
 		}
 		else if (dopower) {
 			BOOTTRACE("exec halt(8) -l -p...");
-			execle(_PATH_HALT, "halt", "-l", "-p", nosync,
+			execle(_PATH_HALT, "fasthalt", "-l", "-p", nosync,
 				(char *)NULL, empty_environ);
 			syslog(LOG_ERR, "shutdown: can't exec %s: %m.",
 				_PATH_HALT);
 			warn(_PATH_HALT);
 		}
 		else if (docycle) {
-			execle(_PATH_HALT, "halt", "-l", "-c", nosync,
+			execle(_PATH_HALT, "fasthalt", "-l", "-c", nosync,
 				(char *)NULL, empty_environ);
 			syslog(LOG_ERR, "shutdown: can't exec %s: %m.",
 				_PATH_HALT);