Add RETRO_ENVIRONMENT_SHUTDOWN.

dynamic.c

@@ -316,6 +316,10 @@ static bool environment_cb(unsigned cmd, void *data)
          break;
       }
 
+      case RETRO_ENVIRONMENT_SHUTDOWN:
+         g_extern.system.shutdown = true;
+         break;
+
       default:
          RARCH_LOG("Environ UNSUPPORTED (#%u).\n", cmd);
          return false;

general.h

@@ -315,6 +315,7 @@ struct global
       char *environment_split;
 
       unsigned rotation;
+      bool shutdown;
    } system;
 
    struct

libretro.h

@@ -111,6 +111,10 @@ extern "C" {
 #define RETRO_ENVIRONMENT_SET_MESSAGE   6  // const struct retro_message * --
                                            // Sets a message to be displayed in implementation-specific manner for a certain amount of 'frames'.
                                            // Should not be used for trivial messages, which should simply be logged to stderr.
+#define RETRO_ENVIRONMENT_SHUTDOWN      7  // N/A (NULL) --
+                                           // Requests the frontend to shutdown.
+                                           // Should only be used if game has a specific
+                                           // way to shutdown the game from a menu item or similar.
 
 struct retro_message
 {

retroarch.c

@@ -2411,7 +2411,8 @@ bool rarch_main_iterate(void)
 
    // Time to drop?
    if (input_key_pressed_func(RARCH_QUIT_KEY) ||
-         !video_alive_func())
+         !video_alive_func() ||
+         g_extern.system.shutdown)
       return false;
 
    // Checks for stuff like fullscreen, save states, etc.