---
name: "SDL_hid_set_nonblocking"
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_hid_set_nonblocking"
---

# SDL\_hid\_set\_nonblocking(3)

Set the device handle to be non-blocking.

## NAME

SDL\_hid\_set\_nonblocking - Set the device handle to be non-blocking.

## HEADER FILE

Defined in SDL3/SDL\_hidapi.h

## SYNOPSIS

```
#include "SDL3/SDL.h"
```

**int SDL\_hid\_set\_nonblocking(SDL\_hid\_device \*dev, int nonblock);**

## DESCRIPTION

In non-blocking mode calls to  **SDL\_hid\_read** () will return immediately with a value of 0 if there is no data to be read. In blocking mode,  **SDL\_hid\_read** () will wait (block) until there is data to read before returning.

Nonblocking can be turned on and off at any time.

## FUNCTION PARAMETERS

- *dev*

  a device handle returned from  **SDL\_hid\_open** ().

- *nonblock*

  enable or not the nonblocking reads - 1 to enable nonblocking - 0 to disable nonblocking.

## RETURN VALUE

Returns 0 on success or a negative error code on failure; call

**SDL\_GetError** () for more information.

## AVAILABILITY

This function is available since SDL 3.2.0.