Provided by: libsdl3-doc_3.2.26+ds-2_all 

NAME
SDL_GetAsyncIOSize - Use this function to get the size of the data stream in an SDL_AsyncIO.
SYNOPSIS
#include <SDL3/SDL_asyncio.h>
Sint64 SDL_GetAsyncIOSize(SDL_AsyncIO *asyncio);
DESCRIPTION
This call is _not_ asynchronous; it assumes that obtaining this info is a non-blocking operation in most
reasonable cases.
FUNCTION PARAMETERS
asyncio
the SDL_AsyncIO to get the size of the data stream from.
RETURN VALUE
Returns the size of the data stream in the SDL_IOStream on success or a negative error code on failure;
call SDL_GetError() for more information.
THREAD SAFETY
It is safe to call this function from any thread.
AVAILABILITY
This function is available since SDL 3.2.0.
Simple Directmedia Layer SDL 3.2.26 SDL_GetAsyncIOSize(3)