#include <stdio.h>
#include <signal.h>
#include <errno.h>

void handler(int sig);

int main()
{
    printf("Hello.\n");

    if(signal(SIGINT, handler) == SIG_ERR )
        printf("Signal error: %s\n", strerror(errno));
    
    while(1) 
        sleep(1000); 

    return 0;

}

void handler(int sig)
{
    printf("Received SIGINT: %d\n", sig);
}