From bf8558bc9cab35f31bccd6a55e51f121370765c4 Mon Sep 17 00:00:00 2001
From: Martin Mares <mj@ucw.cz>
Date: Sun, 16 Jan 2000 17:40:26 +0000
Subject: Converted shutdown to a kind of reconfiguration, it's no more handled
 as a exception in protocol state machines. Introduced a `shutdown' CLI
 command. Killed few reconfiguration bugs.

---
 conf/conf.c | 34 +++++++++++++++++++++++++++++++---
 conf/conf.h |  6 ++++++
 2 files changed, 37 insertions(+), 3 deletions(-)

(limited to 'conf')

diff --git a/conf/conf.c b/conf/conf.c
index 1c5401b..c3f5234 100644
--- a/conf/conf.c
+++ b/conf/conf.c
@@ -25,6 +25,7 @@ static jmp_buf conf_jmpbuf;
 
 struct config *config, *new_config, *old_config, *future_config;
 static event *config_event;
+int shutting_down;
 
 struct config *
 config_alloc(byte *name)
@@ -100,11 +101,13 @@ config_del_obstacle(struct config *c)
 }
 
 static int
-global_commit(struct config *c, struct config *old)
+global_commit(struct config *new, struct config *old)
 {
   if (!old)
     return 0;
-  if (c->router_id != old->router_id)
+  if (!new->router_id)
+    new->router_id = old->router_id;
+  if (new->router_id != old->router_id)
     return 1;
   return 0;
 }
@@ -116,7 +119,7 @@ config_do_commit(struct config *c)
 
   DBG("do_commit\n");
   old_config = config;
-  config = c;
+  config = new_config = c;
   if (old_config)
     old_config->obstacle_count++;
   DBG("sysdep_commit\n");
@@ -144,6 +147,8 @@ config_done(void *unused)
   DBG("config_done\n");
   for(;;)
     {
+      if (config->shutdown)
+	sysdep_shutdown_done();
       log(L_INFO "Reconfigured");
       if (old_config)
 	{
@@ -171,6 +176,12 @@ config_commit(struct config *c)
     }
   if (old_config)			/* Reconfiguration already in progress */
     {
+      if (shutting_down)
+	{
+	  log(L_INFO "New configuration discarded due to shutdown");
+	  config_free(c);
+	  return CONF_SHUTDOWN;
+	}
       if (future_config)
 	{
 	  log(L_INFO "Queueing new configuration, ignoring the one already queued");
@@ -194,6 +205,23 @@ config_commit(struct config *c)
   return CONF_PROGRESS;
 }
 
+void
+order_shutdown(void)
+{
+  struct config *c;
+
+  if (shutting_down)
+    return;
+  log(L_INFO "Shutting down");
+  c = lp_alloc(config->mem, sizeof(struct config));
+  memcpy(c, config, sizeof(struct config));
+  init_list(&c->protos);
+  init_list(&c->tables);
+  c->shutdown = 1;
+  config_commit(c);
+  shutting_down = 1;
+}
+
 void
 cf_error(char *msg, ...)
 {
diff --git a/conf/conf.h b/conf/conf.h
index 7d13ae9..9fe133e 100644
--- a/conf/conf.h
+++ b/conf/conf.h
@@ -27,6 +27,7 @@ struct config {
   struct symbol **sym_hash;		/* Lexer: symbol hash table */
   struct symbol **sym_fallback;		/* Lexer: fallback symbol hash table */
   int obstacle_count;			/* Number of items blocking freeing of this config */
+  int shutdown;				/* This is a pseudo-config for daemon shutdown */
 };
 
 /* Please don't use these variables in protocols. Use proto_config->global instead. */
@@ -35,6 +36,8 @@ extern struct config *new_config;	/* Configuration being parsed */
 extern struct config *old_config;	/* Old configuration when reconfiguration is in progress */
 extern struct config *future_config;	/* New config held here if recon requested during recon */
 
+extern int shutting_down;
+
 struct config *config_alloc(byte *name);
 int config_parse(struct config *);
 int cli_parse(struct config *);
@@ -43,10 +46,12 @@ int config_commit(struct config *);
 void cf_error(char *msg, ...) NORET;
 void config_add_obstacle(struct config *);
 void config_del_obstacle(struct config *);
+void order_shutdown(void);
 
 #define CONF_DONE 0
 #define CONF_PROGRESS 1
 #define CONF_QUEUED 2
+#define CONF_SHUTDOWN 3
 
 /* Pools */
 
@@ -98,5 +103,6 @@ int cf_parse(void);
 
 void sysdep_preconfig(struct config *);
 int sysdep_commit(struct config *, struct config *);
+void sysdep_shutdown_done(void);
 
 #endif
-- 
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