Function return_error 

pub unsafe fn return_error(
    error: &str,
    result_buf: *mut *mut u8,
    result_len: *mut usize,
) -> i32

Return an error result to the framework

This wraps the error message in a JSON object and returns it with an error code.

Safety

The caller must ensure that:

• result_buf points to valid, properly aligned memory for writing a pointer
• result_len points to valid, properly aligned memory for writing a usize
• These pointers remain valid for the duration of the call
• The pointers are not aliased (no other mutable references exist)

Example

unsafe {
    return return_error("Product not found", result_buf, result_len);
}