Revert "Introduce plugin_crt0.c that every plugin links."

Too much errors and no time to fix them now.

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@27863 a1c6a512-1295-4272-9138-f99709370657

apps/plugins/lib/pluginlib_exit.h

@@ -22,33 +22,35 @@
 #ifndef __PLUGINLIB_EXIT_H__
 #define __PLUGINLIB_EXIT_H__
 
-/* make sure we are in sync with the real definitions, especially on
- * hosted systems */
-#include <stdlib.h>
-#include "gcc_extensions.h"
-
-/* these are actually implemented in plugin_crt0.c which all plugins link */
-extern int atexit(void (*func)(void));
-extern void exit(int status) NORETURN_ATTR;
-/* these don't call the exit handlers */
-extern void _exit(int status) NORETURN_ATTR;
-/* C99 version */
-#define _Exit _exit
-
-#ifndef EXIT_SUCCESS
-#define EXIT_SUCCESS 0
-#define EXIT_FAILURE 1
+#include "config.h"
+#if (CONFIG_PLATFORM & PLATFORM_NATIVE)
+#include "../../codecs/lib/setjmp.h"
+#else
+#include <setjmp.h>
 #endif
 
-/**
- * helper function to handle USB connected events coming from
- * button_get()
- *
- * it will exit the plugin if usb is detected, but it will call the atexit func
- * before actually showing the usb screen
- *
- * it additionally handles power off as well, with the same behavior
+#define _PLUGINLIB_EXIT_INIT(atexit) switch(setjmp(__exit_env))   \
+                                     {                            \
+                                         case 1:                  \
+                                             atexit               \
+                                             return PLUGIN_OK;    \
+                                         case 2:                  \
+                                             atexit               \
+                                             return PLUGIN_ERROR; \
+                                         case 0:                  \
+                                         default:                 \
+                                             break;               \
+                                     }
+
+/* Either PLUGINLIB_EXIT_INIT or PLUGINLIB_EXIT_INIT_ATEXIT needs to be placed
+ * as the first line in plugin_start. The _ATEXIT version will call the named
+ * no-argument function when exit() is called before exiting the plugin, to
+ * allow for cleanup.
  */
-extern void exit_on_usb(int button);
+#define PLUGINLIB_EXIT_INIT _PLUGINLIB_EXIT_INIT()
+#define PLUGINLIB_EXIT_INIT_ATEXIT(atexit) _PLUGINLIB_EXIT_INIT(atexit();)
+
+extern jmp_buf __exit_env;
+#define exit(status) longjmp(__exit_env, status != 0 ? 2 : 1)
 
 #endif /*  __PLUGINLIB_EXIT_H__ */