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(This is the legacy documentation for stable SDL2, the current stable version; SDL3 is the current development version.)


Set the device handle to be non-blocking.

Header File

Defined in SDL_hidapi.h


int SDL_hid_set_nonblocking(SDL_hid_device *dev, int nonblock);

Function Parameters

SDL_hid_device * dev A device handle returned from SDL_hid_open().
int nonblock enable or not the nonblocking reads - 1 to enable nonblocking - 0 to disable nonblocking.

Return Value

(int) Returns 0 on success and -1 on error.


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.


This function is available since SDL 2.0.18.

CategoryAPI, CategoryAPIFunction, CategoryHIDAPI

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