*
* Copyright (C) 2002 Matt Kraai.
*
- * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
+ * Licensed under GPLv2 or later, see file LICENSE in this source tree.
*/
-#include <getopt.h>
-#include <stdlib.h>
+//usage:#define losetup_trivial_usage
+//usage: "[-r] [-o OFS] LOOPDEV FILE - associate loop devices\n"
+//usage: " losetup -d LOOPDEV - disassociate\n"
+//usage: " losetup [-f] - show"
+//usage:#define losetup_full_usage "\n\n"
+//usage: " -o OFS Start OFS bytes into FILE"
+//usage: "\n -r Read-only"
+//usage: "\n -f Show first free loop device"
+//usage:
+//usage:#define losetup_notes_usage
+//usage: "No arguments will display all current associations.\n"
+//usage: "One argument (losetup /dev/loop1) will display the current association\n"
+//usage: "(if any), or disassociate it (with -d). The display shows the offset\n"
+//usage: "and filename of the file the loop device is currently bound to.\n\n"
+//usage: "Two arguments (losetup /dev/loop1 file.img) create a new association,\n"
+//usage: "with an optional offset (-o 12345). Encryption is not yet supported.\n"
+//usage: "losetup -f will show the first loop free loop device\n\n"
-#include "busybox.h"
+#include "libbb.h"
-int losetup_main(int argc, char **argv)
+int losetup_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
+int losetup_main(int argc UNUSED_PARAM, char **argv)
{
- unsigned long opt;
+ unsigned opt;
+ int n;
char *opt_o;
- int offset = 0;
+ unsigned long long offset = 0;
+ enum {
+ OPT_d = (1 << 0),
+ OPT_o = (1 << 1),
+ OPT_f = (1 << 2),
+ OPT_r = (1 << 3), /* must be last */
+ };
- opt = bb_getopt_ulflags(argc, argv, "do:", &opt_o);
- argc -= optind;
+ /* max 2 args, -d,-o,-f opts are mutually exclusive */
+ opt_complementary = "?2:d--of:o--df:f--do";
+ opt = getopt32(argv, "do:fr", &opt_o);
argv += optind;
- if (opt == 0x3) // -d + -o (illegal)
- bb_show_usage();
+ if (opt == OPT_o)
+ offset = xatoull(opt_o);
- if (opt == 0x1) { // -d
- /* detach takes exactly one argument */
- if (argc != 1)
+ if (opt == OPT_d) {
+ /* -d BLOCKDEV */
+ if (!argv[0] || argv[1])
bb_show_usage();
- if (!del_loop(argv[0]))
- return EXIT_SUCCESS;
- bb_perror_nomsg_and_die();
+ if (del_loop(argv[0]))
+ bb_simple_perror_msg_and_die(argv[0]);
+ return EXIT_SUCCESS;
}
- if (opt == 0x2) // -o
- offset = bb_xparse_number(opt_o, NULL);
+ if (argv[0]) {
+ char *s;
- /* -o or no option */
+ if (opt == OPT_f) /* -f should not have arguments */
+ bb_show_usage();
- if (argc == 2) {
- if (set_loop(&argv[0], argv[1], offset) < 0)
- bb_perror_nomsg_and_die();
- } else if (argc == 1) {
- char *s = query_loop(argv[0]);
- if (!s) bb_perror_nomsg_and_die();
+ if (argv[1]) {
+ /* [-r] [-o OFS] BLOCKDEV FILE */
+ if (set_loop(&argv[0], argv[1], offset, (opt / OPT_r)) < 0)
+ bb_simple_perror_msg_and_die(argv[0]);
+ return EXIT_SUCCESS;
+ }
+ /* [-r] [-o OFS] BLOCKDEV */
+ s = query_loop(argv[0]);
+ if (!s)
+ bb_simple_perror_msg_and_die(argv[0]);
printf("%s: %s\n", argv[0], s);
- if (ENABLE_FEATURE_CLEAN_UP) free(s);
- } else {
- char dev[11] = "/dev/loop0";
- char c;
- for (c = '0'; c <= '9'; ++c) {
- char *s;
- dev[9] = c;
- s = query_loop(dev);
- if (s) {
- printf("%s: %s\n", dev, s);
- if (ENABLE_FEATURE_CLEAN_UP) free(s);
+ if (ENABLE_FEATURE_CLEAN_UP)
+ free(s);
+ return EXIT_SUCCESS;
+ }
+
+ /* [-r] [-o OFS|-f] with no params */
+ n = 0;
+ while (1) {
+ char *s;
+ char dev[LOOP_NAMESIZE];
+
+ sprintf(dev, LOOP_FORMAT, n);
+ s = query_loop(dev);
+ n++;
+ if (!s) {
+ if (n > 9 && errno && errno != ENXIO)
+ return EXIT_SUCCESS;
+ if (opt == OPT_f) {
+ puts(dev);
+ return EXIT_SUCCESS;
}
+ } else {
+ if (opt != OPT_f)
+ printf("%s: %s\n", dev, s);
+ if (ENABLE_FEATURE_CLEAN_UP)
+ free(s);
}
}
return EXIT_SUCCESS;