NO_SIGNAL_HANDLERS

A hint that specifies not to catch the SIGINT or SIGTERM signals.

The variable can be set to the following values:

• "0" - SDL will install a SIGINT and SIGTERM handler, and when it

  catches a signal, convert it into an SDL_QUIT event

• "1" - SDL will not install a signal handler at all

By default SDL installs a SIGINT and SIGTERM handler, and when it catches a signal, converts it into an SDL_QUIT event.