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

res/res_odbc.c

@@ -106,7 +106,6 @@ static void odbc_init(void)
 	}
 }
 
-static char *tdesc = "ODBC Resource";
 /* internal stuff */
 
 SQLHSTMT odbc_prepare_and_execute(odbc_obj *obj, SQLHSTMT (*prepare_cb)(odbc_obj *obj, void *data), void *data)
@@ -578,7 +577,7 @@ odbc_status odbc_obj_connect(odbc_obj *obj)
 
 LOCAL_USER_DECL;
 
-int unload_module(void)
+static int unload_module(void *mod)
 {
 	STANDARD_HANGUP_LOCALUSERS;
 	odbc_destroy();
@@ -589,7 +588,7 @@ int unload_module(void)
 	return 0;
 }
 
-int load_module(void)
+static int load_module(void *mod)
 {
 	odbc_init();
 	load_odbc_config();
@@ -600,19 +599,14 @@ int load_module(void)
 	return 0;
 }
 
-const char *description(void)
+static const char *description(void)
 {
-	return tdesc;
+	return "ODBC Resource";
 }
 
-int usecount(void)
-{
-	int res;
-	STANDARD_USECOUNT(res);
-	return res;
-}
-
-const char *key()
+static const char *key(void)
 {
 	return ASTERISK_GPL_KEY;
 }
+
+STD_MOD(MOD_0, NULL, NULL, NULL);