Operating Systems

Daffodil International University Faculty of Science & Information Technology Department of Computer Science & Engineering CT-02, Fall 2026 Course Code: CSE323, Section: O, Course Title: Operating System Time: 30 Mints Marks: 15 Answer ALL Questions [The figures in the right margin indicate the full marks and corresponding course outcomes. All portions of each question must be answered sequentially.] #include <stdio.h> #include <unistd.h> #include <sys/types.h> int main() { pid_t pid = fork(); if (pid == 0) { printf("Child: PID = %d\n", getpid()); sleep(3); printf("Child: Execution completed\n"); } else { printf("Parent: PID = %d\n", getpid()); sleep(1); printf("Parent: Execution completed\n"); } return 0; } 1. Explain how fork() creates a new process with a diagram. Identify the parent and child processes in this program and state the return value of fork() in each process. [4] 2. Explain whether a zombie or an orphan process can occur during the execution of this program. Justify your answer using the execution sequence. [4] 3. Modify only one line of the program to ensure that the parent waits for the child to finish before terminating. Write the modified line and explain its effect. [3] 4. Suppose the child process must send the message "Task completed" to the parent process instead of relying on printf(). Identify a suitable IPC mechanism and explain with a diagram how it can accomplish this communication. [4]