When shutting down "gracefully", go through and run the unload() callbacks for

all of the modules.  "stop now" is considered a non-graceful shutdown and will
not go through this process.
(issue #9804, reported by chrisost, patch by me)


git-svn-id: https://origsvn.digium.com/svn/asterisk/branches/1.4@67308 65c4cc65-6c06-0410-ace0-fbb531ad65f3

include/asterisk/module.h

@@ -134,6 +134,13 @@ int ast_loader_register(int (*updater)(void));
  */
 int ast_loader_unregister(int (*updater)(void));
 
+/*!
+ * \brief Run the unload() callback for all loaded modules
+ *
+ * This function should be called when Asterisk is shutting down gracefully.
+ */
+void ast_module_shutdown(void);
+
 /*! 
  * \brief Match modules names for the Asterisk cli.
  * \param line Unused by this function, but this should be the line we are

main/asterisk.c

@@ -124,6 +124,7 @@ int daemon(int, int);  /* defined in libresolv of all places */
 #include "asterisk/version.h"
 #include "asterisk/linkedlists.h"
 #include "asterisk/devicestate.h"
+#include "asterisk/module.h"
 
 #include "asterisk/doxyref.h"		/* Doxygen documentation */
 
@@ -1253,6 +1254,9 @@ static void quit_handler(int num, int nice, int safeshutdown, int restart)
 				ast_verbose("Asterisk %s cancelled.\n", restart ? "restart" : "shutdown");
 			return;
 		}
+
+		if (nice)
+			ast_module_shutdown();
 	}
 	if (ast_opt_console || ast_opt_remote) {
 		if (getenv("HOME")) 

main/loader.c

@@ -427,6 +427,31 @@ static struct ast_module *load_dynamic_module(const char *resource_in, unsigned
 }
 #endif
 
+void ast_module_shutdown(void)
+{
+	struct ast_module *mod;
+	AST_LIST_HEAD_NOLOCK_STATIC(local_module_list, ast_module);
+
+	/* We have to call the unload() callbacks in reverse order that the modules
+	 * exist in the module list so it is the reverse order of how they were
+	 * loaded. */
+
+	AST_LIST_LOCK(&module_list);
+	while ((mod = AST_LIST_REMOVE_HEAD(&module_list, entry)))
+		AST_LIST_INSERT_HEAD(&local_module_list, mod, entry);
+	AST_LIST_UNLOCK(&module_list);
+
+	while ((mod = AST_LIST_REMOVE_HEAD(&local_module_list, entry))) {
+		if (mod->info->unload)
+			mod->info->unload();
+		/* Since this should only be called when shutting down "gracefully",
+		 * all channels should be down before we get to this point, meaning
+		 * there will be no module users left. */
+		AST_LIST_HEAD_DESTROY(&mod->users);
+		free(mod);
+	}
+}
+
 int ast_unload_resource(const char *resource_name, enum ast_module_unload_mode force)
 {
 	struct ast_module *mod;