I am generating signal and facing the strange behaviour

Question

I have started getting my hands of signals in Linux but here is some strange behavior happening in my code. I have just started and I searched for it too but I have not found anything, sorry if the question is too lame, here is the code-

void Handler(int sig ){
    printf("Inside Handler\n");
}

int main(int argc, char * argv[], char * envp[]){
    if( signal(SIGINT, Handler) ==SIG_ERR )
        exit(EXIT_FAILURE);

    for(size_t i = 0; ; i++){
        printf("%d\n", i);
        sleep(2);
    }
}

I know printf, signal calls are not the good idea to use but I have not studied sigaction till now. Now according to my book and others tutorial if I press ctrl+c then it has to call Handler every time but here is the strange thing: when I am pressing ctrl+c once, it's calling Handler but the next time it's terminating the program. Why is this strange thing happening?

Answer 1

Here is the code which I have written with your help which is working perfectly fine and I believe this will work nicely in each and every platform

#define _GNU_SOURCE

void Handler(int sig ){
printf("Inside Handler\n");
}

int main(int argc, char *argv[], char *envp[] ){
sighandler_t Action =Handler;

if( Action == SIG_DFL ){
Action = Handler;
}

if( signal(SIGINT, Action ) == SIG_ERR )
  exit(EXIT_FAILURE );

for(size_t k = 0 ; ; k++ ){
 printf("%d\n", k );
 sleep(2);
}

}