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MCQ Tutorial - Linux->Process

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121.) Semaphore P() operation usually does the following:
Options are:
A.) Descrements the semaphore count and the process sleeps if needed
B.) None of the mentioned options
C.) Increments the semaphore count
D.) Wakes up a sleeping process
122.) What is the output of the below code?

    void sig_handler ( int signum) {
        printf("Handled the signal\n");
    }

    int main() {
        int pid;
        signal (SIGKILL, sig_handler);
        pid = fork();
        if (pid==0) {
            kill(getppid(), SIGKILL);
            exit(0);
        } else {
            sleep(20);
        }
        return 0;
    }
Options are:
A.) Parent goes to the signal handler, prints handled the signal and goes back to sleep
B.) Error child cannot send a SIGKILL signal to parent.
C.) Parent exits without going to the signal handler
D.) Parent goes to the signal handler, prints handled the signal and exits
                        
123.) If a signal is received by a process, when will it be processed?
Options are:
A.) None of the mentioned options
B.) It is processed when process is switching to kernel mode
C.) It is processed immediately
D.) It is processsed in the next timeslice given to the process
                        
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