cleanup functions.cpp

#include <stdint.h>
#include <stdlib.h>
#include <stdio.h>
#include <signal.h>

unsigned long long int numLaughs = 0;


void normalExit(void){
	printf("\nI laughed %llu times、\n\n", numLaughs);
}

void bye(const int signal){
	if (signal == SIGINT)
		printf("\n\n哈哈, I caught your SIGINT！\n");
	else if (signal == SIGABRT)
		printf("\n\n哈哈, I caught your SIGABRT！\n");
	else if (signal == SIGTERM)
		printf("\n\n哈哈, I caught your SIGINT！\n");
	else if (signal == SIGTSTP)
		printf("\n\n哈哈, I caught your SIGTSTP！\n");
	else
		printf("\n\n0____o ummmmmm err#%d", signal);
	
	exit(0); // calls normalExit()
}




int main(){

	atexit(normalExit);

    //^C
    signal(SIGINT, bye);

    //abort()
    signal(SIGABRT, bye);

    //sent by "kill" command
    signal(SIGTERM, bye);

    //^Z
    signal(SIGTSTP, bye);

	putchar('X');
	while (1) {
		putchar('D');
		numLaughs++;
	}

}