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#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
static void handler(int);
int ctrl_c = 0;
int *ptr = (int*) &ctrl_c;
void main(void) {
if (signal(SIGINT, handler) == SIG_ERR)
printf( "Couldn't handle SIGINT.\n");
while (1) {
if (ctrl_c) {
printf("Ctrl+C is pressed\n");
static void handler(int signum) {
printf("key is pressed\n");
*ptr = 1;
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