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

apps/app_echo.c

@@ -95,7 +95,7 @@ static int echo_exec(struct ast_channel *chan, void *data)
 	return res;
 }
 
-int unload_module(void)
+static int unload_module(void *mod)
 {
 	int res;
 
@@ -106,24 +106,19 @@ int unload_module(void)
 	return res;
 }
 
-int load_module(void)
+static int load_module(void *mod)
 {
 	return ast_register_application(app, echo_exec, synopsis, descrip);
 }
 
-const char *description(void)
+static const char *description(void)
 {
 	return tdesc;
 }
 
-int usecount(void)
-{
-	int res;
-	STANDARD_USECOUNT(res);
-	return res;
-}
-
-const char *key()
+static const char *key(void)
 {
 	return ASTERISK_GPL_KEY;
 }
+
+STD_MOD1;