1 /* vi: set sw=4 ts=4: */
3 * Mini losetup implementation for busybox
5 * Copyright (C) 2002 Matt Kraai.
7 * Licensed under GPLv2 or later, see file LICENSE in this source tree.
10 //usage:#define losetup_trivial_usage
11 //usage: "[-r] [-o OFS] LOOPDEV FILE - associate loop devices\n"
12 //usage: " losetup -d LOOPDEV - disassociate\n"
13 //usage: " losetup [-f] - show"
14 //usage:#define losetup_full_usage "\n\n"
15 //usage: " -o OFS Start OFS bytes into FILE"
16 //usage: "\n -r Read-only"
17 //usage: "\n -f Show first free loop device"
19 //usage:#define losetup_notes_usage
20 //usage: "No arguments will display all current associations.\n"
21 //usage: "One argument (losetup /dev/loop1) will display the current association\n"
22 //usage: "(if any), or disassociate it (with -d). The display shows the offset\n"
23 //usage: "and filename of the file the loop device is currently bound to.\n\n"
24 //usage: "Two arguments (losetup /dev/loop1 file.img) create a new association,\n"
25 //usage: "with an optional offset (-o 12345). Encryption is not yet supported.\n"
26 //usage: "losetup -f will show the first loop free loop device\n\n"
30 int losetup_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
31 int losetup_main(int argc UNUSED_PARAM, char **argv)
36 unsigned long long offset = 0;
41 OPT_r = (1 << 3), /* must be last */
44 /* max 2 args, -d,-o,-f opts are mutually exclusive */
45 opt_complementary = "?2:d--of:o--df:f--do";
46 opt = getopt32(argv, "do:fr", &opt_o);
50 offset = xatoull(opt_o);
54 if (!argv[0] || argv[1])
56 if (del_loop(argv[0]))
57 bb_simple_perror_msg_and_die(argv[0]);
64 if (opt == OPT_f) /* -f should not have arguments */
68 /* [-r] [-o OFS] BLOCKDEV FILE */
69 if (set_loop(&argv[0], argv[1], offset, (opt / OPT_r)) < 0)
70 bb_simple_perror_msg_and_die(argv[0]);
73 /* [-r] [-o OFS] BLOCKDEV */
74 s = query_loop(argv[0]);
76 bb_simple_perror_msg_and_die(argv[0]);
77 printf("%s: %s\n", argv[0], s);
78 if (ENABLE_FEATURE_CLEAN_UP)
83 /* [-r] [-o OFS|-f] with no params */
87 char dev[LOOP_NAMESIZE];
89 sprintf(dev, LOOP_FORMAT, n);
93 if (n > 9 && errno && errno != ENXIO)
101 printf("%s: %s\n", dev, s);
102 if (ENABLE_FEATURE_CLEAN_UP)