Provided by: libsdl3-doc_3.2.8+ds-1_all 

NAME
SDL_SetAssertionHandler - Set an application-defined assertion handler.
HEADER FILE
Defined in SDL3/SDL_assert.h
SYNOPSIS
#include "SDL3/SDL.h" void SDL_SetAssertionHandler( SDL_AssertionHandler handler, void *userdata);
DESCRIPTION
This function allows an application to show its own assertion UI and/or force the response to an assertion failure. If the application doesn't provide this, SDL will try to do the right thing, popping up a system-specific GUI dialog, and probably minimizing any fullscreen windows. This callback may fire from any thread, but it runs wrapped in a mutex, so it will only fire from one thread at a time. This callback is NOT reset to SDL's internal handler upon SDL_Quit ()!
FUNCTION PARAMETERS
handler the SDL_AssertionHandler function to call when an assertion fails or NULL for the default handler. userdata a pointer that is passed to handler .
THREAD SAFETY
It is safe to call this function from any thread.
AVAILABILITY
This function is available since SDL 3.2.0.
SEE ALSO
•(3), SDL_GetAssertionHandler(3) Simple Directmedia Layer SDL 3.2.8 SDL_SetAssertionHandler(3)