player/Project/Src/MY/sys_api.h

#ifndef sys_api_h__
#define sys_api_h__

#include "stddef.h"
#include "stdint.h"
#include "stdlib.h"

typedef struct {
  void *fun;
  int index;
} api_item_struct;

#define api_item(fun_, index_)                                                 \
  __attribute__((used, section(".sys_api"))) static const api_item_struct      \
      api_##index_ = {.fun = fun_, .index = index_}

#endif