Adjusted mg_callbacks.md documentation and embedded.c example for server_domain paramter to init_ssl

docs/api/mg_callbacks.md

@@ -22,8 +22,8 @@
 | |The callback function `init_lua()` is called just before a Lua server page is to be served. Lua page serving must have been enabled at compile time for this callback function to be called. The parameter `lua_context` is a `lua_State *` pointer.|
 |**`external_ssl_ctx`**|**`int (*external_ssl_ctx)(void **ssl_ctx, void *user_data);`**|
 | |The callback function `external_ssl_ctx()` is called when civetweb is about to create (`*ssl_ctx` is `NULL`) or free (`*ssl_ctx` is not `NULL`) a SSL context. The parameter `user_data` contains a pointer to the data which was provided to `mg_start()` when the server was started. The callback function can return 0 to signal that CivetWeb should setup the SSL context. With a return value of 1 the callback function signals CivetWeb that the SSL context has already been setup and no further processing is necessary. Also with a return value of 1 another callback function `init_ssl()` is not called. The value -1 should be returned when the SSL context initialization fails.|
-|**`init_ssl`**|**`int (*init_ssl)( void *ssl_context, void *user_data );`**|
-| |The callback function `init_ssl()` is called when CivetWeb initializes the SSL library. The parameter `user_data` contains a pointer to the data which was provided to `mg_start()` when the server was started. The callback function can return 0 to signal that CivetWeb should setup the SSL certificate. With a return value of 1 the callback function signals CivetWeb that the certificate has already been setup and no further processing is necessary. The value -1 should be returned when the SSL initialization fails.|
+|**`init_ssl`**|**`int (*init_ssl)( const char *server_domain, void *ssl_ctx, void *user_data );`**|
+| |The callback function `init_ssl()` is called when CivetWeb initializes the SSL library. The parameter `server_domain` is a pointer to the `authentication_domain` config parameter of the domain being configured. The `ssl_ctx` parameter is a pointer to the SSL context being configure. The parameter `user_data` contains a pointer to the data which was provided to `mg_start()` when the server was started. The callback function can return 0 to signal that CivetWeb should setup the SSL certificate. With a return value of 1 the callback function signals CivetWeb that the certificate has already been setup and no further processing is necessary. The value -1 should be returned when the SSL initialization fails.|
 |**`init_thread`**|**`void * (*init_thread)( const struct mg_context *ctx, int thread_type );`**|
 | |The callback function `init_thread()` is called when a new thread is created by CivetWeb. The `thread_type` parameter indicates which type of thread has been created. following thread types are recognized:|
 | |**0** - The master thread is created |

examples/embedded_c/embedded_c.c

@@ -916,10 +916,10 @@ get_dh2236()
 
 #ifndef TEST_WITHOUT_SSL
 int
-init_ssl(void *ssl_context, void *user_data)
+init_ssl(const char *server_domain, void *ssl_ctx, void *user_data)
 {
 	/* Add application specific SSL initialization */
-	struct ssl_ctx_st *ctx = (struct ssl_ctx_st *)ssl_context;
+	struct ssl_ctx_st *ctx = (struct ssl_ctx_st *)ssl_ctx;
 
 #ifdef USE_SSL_DH
 	/* example from https://github.com/civetweb/civetweb/issues/347 */