---
name: "SDL_GetAsyncIOSize"
section: "3"
platform: "linux"
package: "libsdl3-doc"
version: "3.2.10+ds-1"
release: "Debian 13 (Trixie)"
platforms: ["linux"]
url: "https://new.carta.tech/SDL_GetAsyncIOSize"
---

# SDL\_GetAsyncIOSize(3)

Use this function to get the size of the data stream in an SDL\_AsyncIO .

## NAME

SDL\_GetAsyncIOSize - Use this function to get the size of the data stream in an  **SDL\_AsyncIO** .

## HEADER FILE

Defined in SDL3/SDL\_asyncio.h

## SYNOPSIS

```
#include "SDL3/SDL.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

( **Sint64** ) 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.