#include <stdlib.h>void _Exit(int exit_code);
_Exit( ) was added by C99.
The _Exit( ) function is similar to exit( ) except for the following:
No calls to termination functions registered by atexit( ) are made.
No calls to signal handlers registered by signal( ) are made.
Open files are not necessarily flushed or closed.
Related functions are atexit( ), abort( ), and exit( ).