Check all the correct claims which concern the code below.
The following code makes it
possible to exchange signals between a sender and a receiver. We assume
that the receiver is started a few seconds before the sender. Also, the
command line to start the sender provides the process id of receiver.
Last but not least, we assume that all works as
expected (no process is killed during execution, etc.)
Receiver code:
void getSignal(int signo) {
if (signo == SIGUSR1) {
    printf("Received SIGUSR1\n");
} else {
    printf("Received%d\n", signo);
}
}
int main(void)
{

printf("Registering SIGUSR1 signal / #SIGUSR1=%d\n", SIGUSR1);
signal(SIGUSR1, getSignal);
sleep(30);
}
Sender code:
int main(int argc, char**argv) {
int pid;
if (argc <2) {
    printf("Usage: sender <destination process pid>\n");
    exit(-1);

}

pid = atoi(argv[1]);
printf("Sending SIGURG to %d\n", pid);
kill(pid, SIGURG);
printf("Sending SIGUSR1 to %d\n", pid);
kill(pid, SIGUSR1);
printf("Sending SIGUSR1 to %d\n", pid);
kill(pid, SIGUSR1);
}

Question

Check all the correct claims which concern the code below. 
 The following code makes it 
possible to exchange signals between a sender and a receiver. We assume 
that the receiver is started a few seconds before the sender. Also, the 
command line to start the sender provides the process id of receiver. 
Last but not least, we assume that all works as
    expected (no process is killed during execution, etc.) 
 
 Receiver code: void getSignal(int signo) { 
   if (signo == SIGUSR1) { 
     printf("Received SIGUSR1
"); 
   } else { 
     printf("Received%d
", signo); 
   } 
 } 
 
 int main(void)
    {
     
   printf("Registering SIGUSR1 signal / #SIGUSR1=%d
", SIGUSR1); 
   signal(SIGUSR1, getSignal); 
   sleep(30); 
 }

Sender code: int main(int argc, char**argv) { 
   int pid; 
   if (argc <2) { 
     printf("Usage: sender <destination process pid>
"); 
     exit(-1); 
  
    }
     
   pid = atoi(argv[1]); 
   printf("Sending SIGURG to %d
", pid);  
   kill(pid, SIGURG); 
   printf("Sending SIGUSR1 to %d
", pid);  
   kill(pid, SIGUSR1); 
   printf("Sending SIGUSR1 to %d
", pid);  
   kill(pid, SIGUSR1); 
  }

Accepted Answer

getSignal() is called one time

Answer

getSignal() is called two times

Answer

The return values of all system calls are checked for errors

Answer

getSignal() is called three times

Answer

If SIGKILL were to be sent at first by sender instead of SIGURG, the behavior of receiver would be the same.

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