1 #include <stdio.h> 2 #include <stdlib.h> 3 #include <unistd.h> 4 #include <getopt.h> 5 #include <sys/swap.h> 6 7 static void usage(char *name) 8 { 9 fprintf(stderr, "Usage: %s [-p prio] <filename>\n" 10 " prio must be between 0 and %d\n", name, SWAP_FLAG_PRIO_MASK); 11 } 12 13 static int parse_prio(char *prio_str) 14 { 15 unsigned long p = strtoul(prio_str, NULL, 10); 16 17 return (p > SWAP_FLAG_PRIO_MASK)? -1 : (int)p; 18 } 19 20 int swapon_main(int argc, char **argv) 21 { 22 int err = 0; 23 int flags = 0; 24 int prio; 25 26 opterr = 0; 27 do { 28 int c = getopt(argc, argv, "hp:"); 29 if (c == -1) 30 break; 31 32 switch (c) { 33 case 'p': 34 if (optarg != NULL) 35 prio = parse_prio(optarg); 36 else 37 prio = -1; 38 39 if (prio < 0) { 40 usage(argv[0]); 41 return -EINVAL; 42 } 43 flags |= SWAP_FLAG_PREFER; 44 flags |= (prio << SWAP_FLAG_PRIO_SHIFT) & SWAP_FLAG_PRIO_MASK; 45 break; 46 case 'h': 47 usage(argv[0]); 48 return 0; 49 case '?': 50 fprintf(stderr, "unknown option: %c\n", optopt); 51 return -EINVAL; 52 } 53 } while (1); 54 55 if (optind != argc - 1) { 56 usage(argv[0]); 57 return -EINVAL; 58 } 59 60 err = swapon(argv[argc - 1], flags); 61 if (err) { 62 fprintf(stderr, "swapon failed for %s\n", argv[argc - 1]); 63 } 64 65 return err; 66 } 67
