#include #include #include #include <sys/types.h> #include <sys/wait.h> int main(int argc, char *argv[]) { // (d) Check for correct number of arguments if (argc != 3) { fprintf(stderr, “Usage: %s \n”, argv[0]); exit(1); } // (i) Print from the parent process printf(“Parent Process ID: %d\n”, getpid()); printf(“Parent’s Parent Process ID: %d\n”, getppid()); printf(“Parent Process Group ID: %d\n”, getpgrp()); pid_t pid = fork(); // (e) Fork if (pid < 0) { perror(“fork”); exit(1); } else if (pid == 0) { // This block will be executed by child // (h) Print from the child process printf(“\nChild Process ID: %d\n”, getpid()); printf(“Child’s Parent Process ID: %d\n”, getppid()); printf(“Child Process Group ID: %d\n”, getpgrp()); // (f) Use execl to call cp // Uncomment below line for execl // execl(“/bin/cp”, “cp”, “-p”, “-i”, argv[1], argv[2], (char *)NULL); // (j) Comment out the execl call and add instead a call to execv char *newargv[] = {“cp”, “-p”, “-i”, argv[1], argv[2], NULL}; execv(“/bin/cp”, newargv); // execv call perror(“exec”); // execv or execl failed exit(1); } else { // This block will be executed by parent wait(NULL); // (g) Wait for the child to finish } return 0; }
