Patch from Andrew Flegg:

    Here's a pretty crude patch to reload /etc/inittab when init receives a
    SIGHUP. The mailing list archives weren't entirely clear on whether or
    not it should already happen, but didn't appear to be.

    The patch:
       * Adds a new function, reload_signal() which just calls
	 parse_inittab() and run_actions(RESPAWN)

       * Before entering the while (1) loop set up SIGHUP to call
	 reload_signal()

       * Modify new_init_action to skip the action if the same command
	 already exists on the same terminal

    This last bit means that changing already running entries is a bit
    hairy as you can end up with, for example, two shells running on the
    same virtual console. However, for solely adding/removing entries this patch
    seems to work quite well.

1 files changed, 19 insertions, 2 deletions

diff --git a/init/init.c b/init/init.c
index 1f0bd4aec..657bad6cd 100644
--- a/init/init.c
+++ b/init/init.c
@@ -847,7 +847,14 @@ static void new_init_action(int action, char *command, const char *cons)
         }
 
         /* Append to the end of the list */
-        for (a = init_action_list; a && a->next; a = a->next);
+        for (a = init_action_list; a && a->next; a = a->next) {
+                /* don't enter action if it's already in the list */
+                if ((strcmp(a->command, command) == 0) && 
+                    (strcmp(a->terminal, cons) ==0)) {
+                        free(new_action);
+                        return;
+                }
+        }
         if (a) {
                 a->next = new_action;
         } else {
@@ -1022,7 +1029,14 @@ static void parse_inittab(void)
 #endif                                                  /* CONFIG_FEATURE_USE_INITTAB */
 }
 
-
+static void reload_signal(int sig)
+{
+        message(LOG, "Reloading /etc/inittab");
+        parse_inittab();
+        run_actions(RESPAWN);
+        return;
+}
+                                                                                
 extern int init_main(int argc, char **argv)
 {
         struct init_action *a;
@@ -1120,6 +1134,9 @@ extern int init_main(int argc, char **argv)
                 loop_forever();
         }
 
+        /* Redefine SIGHUP to reread /etc/inittab */
+        signal(SIGHUP, reload_signal);
+
         /* Now run the looping stuff for the rest of forever */
         while (1) {
                 /* run the respawn stuff */