xl/libxl: make shutdown accept the long option --wait for -w

Make xl/libxl accept the long option --wait for -w to be compatible with xm.
The long options are used in the default init and sysconfig scripts.

Signed-off-by: Sander Eikelenboom <linux@eikelenboom.it>
Acked-by: Ian Campbell <ian.campbell@citrix.com>
Committed-by: Ian Campbell <ian.campbell@citrix.com>

xen-unstable changeset: 26045:ba7198bfc679
Backport-requested-by: Ian Campbell <Ian.Campbell@citrix.com>
Committed-by: Ian Jackson <ian.jackson@eu.citrix.com>

docs/man/xl.pod.1

@@ -550,7 +550,7 @@ B<OPTIONS>
 
 =over 4
 
-=item B<-w>
+=item B<-w>, B<--wait>
 
 Wait for the domain to complete shutdown before returning.
 

tools/libxl/xl_cmdimpl.c

@@ -3683,8 +3683,12 @@ int main_shutdown(int argc, char **argv)
     int opt;
     int wait = 0;
     int fallback_trigger = 0;
+    static struct option long_options[] = {
+        {"wait", 0, 0, 'w'},
+        {0, 0, 0, 0}
+    };
 
-    while ((opt = def_getopt(argc, argv, "wF", "shutdown", 1)) != -1) {
+    while ((opt = getopt_long(argc, argv, "wF", long_options, NULL)) != -1) {
         switch (opt) {
         case 0: case 2:
             return opt;

tools/libxl/xl_cmdtable.c

@@ -64,7 +64,7 @@ struct cmd_spec cmd_table[] = {
       "-h                      Print this help.\n"
       "-F                      Fallback to ACPI power event for HVM guests with\n"
       "                        no PV drivers.\n"
-      "-w                      Wait for guest to shutdown.\n"
+      "-w, --wait              Wait for guest to shutdown.\n"
     },
     { "reboot",
       &main_reboot, 0, 1,