added childeren kill after parent exit

fork_bomb/fork_bomb.c

@@ -6,6 +6,8 @@
 #include <dirent.h>
 #include <ctype.h>
 #include <time.h>
+#include <signal.h>
+#include <sys/prctl.h>
 
 
 #define DEFAULT_NUM_LEN 512
@@ -287,6 +289,12 @@ int main(void)
     }
 
     if (pid == 0) {
+      if (prctl(PR_SET_PDEATHSIG, SIGKILL) != 0) {
+        _exit(1);
+      }
+      if (getppid() == 1) {
+        _exit(0);
+      }
       pause();
       return 0;
     }