Question

What’s the output of following code fragment:

1. #include<stdio.h>

2. #include<signal.h>

3. void response (int sig_no) { printf("25"); }

4. void response2 (int sig_no) { printf("43"); }

5.    

6. int main() {

7.      int id = getpid();

8.      signal(SIGUSR1, response);

9. signal(SIGKILL, response2);

10. for(int i=0; i<4; i++) {

11. sleep(1);

12. if (i % 3 == 0) { kill(id, SIGUSR1); }

13. else { kill(id, SIGKILL); }

14. }

15. return 0;

16. }

Answer 1

source code:

#include<stdio.h>

#include<signal.h>

void response (int sig_no) { printf("25"); }

void response2 (int sig_no) { printf("43"); }

int main() {

int id = getpid();

signal(SIGUSR1, response);

signal(SIGKILL, response2);

for(int i=0; i<4; i++) {

sleep(1);

if (i % 3 == 0) { kill(id, SIGUSR1); }

else { kill(id, SIGKILL); }

}

return 0;

}

output:

Killed

screenshot:

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