// Error handling is omitted
char error_buf[128];

wasm_module_t module = wasm_runtime_load(
  module_array, module_array_length, error_buf, sizeof(error_buf));

wasm_module_inst_t module_inst = wasm_runtime_instantiate(
  module, STACK_SIZE, HEAP_SIZE, error_buf, sizeof(error_buf));

wasm_exec_env_t exec_env = wasm_runtime_create_exec_env(
  module_inst, STACK_SIZE);

wasm_function_inst_t func = wasm_runtime_lookup_function(
  module_inst, "wasm_module");

// Arguments can be supplied to the function
// by passing a pointer to an args buffer.
// No arguments are set here, but a single
// slot is reserved for the return value.
uint32_t argv[1];
uint32_t argc = 0;
wasm_runtime_call_wasm(exec_env, func, argc, argv);
uint32_t retval = argv[0];