...ch (opt) { case 's': mode = 1; break; case 'r': mode = 2; break; case 't': msgtype = atoi(optarg); if (msgtype <= 0) usage(argv[0], "-t option must be greater than 0\n"); break;…...ch (opt) { case 's': mode = 1; break; case 'r': mode = 2; break; case 't': msgtype = atoi(optarg); if (msgtype <= 0) usage(argv[0], "-t option must be greater than 0\n"); break;…...ch (opt) { case 's': mode = 1; break; case 'r': mode = 2; break; case 't': msgtype = atoi(optarg); if (msgtype <= 0) usage(argv[0], "-t option must be greater than 0\n"); break;…change properties of a mount or mount tree NAME mount_setattr - change properties of a mount or mount tree LIBRARY Standard C library ( libc , -lc ) SYNOPSIS #include <linux/fcntl.…