This rather large commit changes the way modules are loaded.

As partly documented in loader.c and include/asterisk/module.h,
modules are now expected to return all of their methods and flags
into a structure 'mod_data', and are normally loaded with RTLD_NOW
| RTLD_LOCAL, so symbols are resolved immediately and conflicts
should be less likely.  Only in a small number of cases (res_*,
typically) modules are loaded RTLD_GLOBAL, so they can export
symbols.
 
The core of the change is only the two files loader.c and
include/asterisk/module.h, all the rest is simply adaptation of the
existing modules to the new API, a rather mechanical (but believe
me, time and finger-consuming!) process whose detail you can figure
out by svn diff'ing any single module.

Expect some minor compilation issue after this change, please
report it on mantis http://bugs.digium.com/view.php?id=6968
so we collect all the feedback in one place.

I am just sorry that this change missed SVN version number 20000!



git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@20003 65c4cc65-6c06-0410-ace0-fbb531ad65f3

pbx/pbx_realtime.c

@@ -61,7 +61,6 @@ ASTERISK_FILE_VERSION(__FILE__, "$Revision$")
 
 #define EXT_DATA_SIZE 256
 
-static char *tdesc = "Realtime Switch";
 
 /* Realtime switch looks up extensions in the supplied realtime table.
 
@@ -246,30 +245,26 @@ static struct ast_switch realtime_switch =
         matchmore:              realtime_matchmore,
 };
 
-const char *description(void)
+static const char *description(void)
 {
-	return tdesc;
+	return "Realtime Switch";
 }
 
-int usecount(void)
-{
-	return 1;
-}
-
-const char *key()
+static const char *key(void)
 {
 	return ASTERISK_GPL_KEY;
 }
 
-int unload_module(void)
+static int unload_module(void *mod)
 {
 	ast_unregister_switch(&realtime_switch);
 	return 0;
 }
 
-int load_module(void)
+static int load_module(void *mod)
 {
 	ast_register_switch(&realtime_switch);
 	return 0;
 }
 
+STD_MOD(MOD_1 | NO_USECOUNT | NO_UNLOAD, NULL, NULL, NULL);