diff options
Diffstat (limited to 'util-linux/losetup.c')
| -rw-r--r-- | util-linux/losetup.c | 27 |
1 files changed, 26 insertions, 1 deletions
diff --git a/util-linux/losetup.c b/util-linux/losetup.c index 4424d9cbb..d356f49c2 100644 --- a/util-linux/losetup.c +++ b/util-linux/losetup.c @@ -127,12 +127,37 @@ int losetup_main(int argc UNUSED_PARAM, char **argv) d = *argv++; if (argv[0]) { - if (set_loop(&d, argv[0], offset, (opt & OPT_r)) < 0) + if (set_loop(&d, argv[0], offset, (opt & OPT_r) ? BB_LO_FLAGS_READ_ONLY : 0) < 0) bb_simple_perror_msg_and_die(argv[0]); return EXIT_SUCCESS; } } + /* TODO: util-linux 2.28 shows this when run w/o params: + * NAME SIZELIMIT OFFSET AUTOCLEAR RO BACK-FILE DIO + * /dev/loop0 0 0 1 0 /PATH/TO/FILE 0 + * + * implemented by reading /sys: + * + * open("/sys/block", O_RDONLY|O_NONBLOCK|O_DIRECTORY|O_CLOEXEC) = 3 + * newfstatat(3, "loop0/loop/backing_file", {st_mode=S_IFREG|0444, st_size=4096, ...}, 0) = 0 + * stat("/dev/loop0", {st_mode=S_IFBLK|0660, st_rdev=makedev(7, 0), ...}) = 0 + * open("/sys/dev/block/7:0/loop/offset", O_RDONLY|O_CLOEXEC) = 5 + * read(5, "0\n", 4096) = 2 + * open("/sys/dev/block/7:0/loop/sizelimit", O_RDONLY|O_CLOEXEC) = 5 + * read(5, "0\n", 4096) = 2 + * open("/sys/dev/block/7:0/loop/offset", O_RDONLY|O_CLOEXEC) = 5 + * read(5, "0\n", 4096) = 2 + * open("/sys/dev/block/7:0/loop/autoclear", O_RDONLY|O_CLOEXEC) = 5 + * read(5, "1\n", 4096) = 2 + * open("/sys/dev/block/7:0/ro", O_RDONLY|O_CLOEXEC) = 5 + * read(5, "0\n", 4096) = 2 + * open("/sys/dev/block/7:0/loop/backing_file", O_RDONLY|O_CLOEXEC) = 5 + * read(5, "/PATH/TO/FILE", 4096) = 37 + * open("/sys/dev/block/7:0/loop/dio", O_RDONLY|O_CLOEXEC) = 5 + * read(5, "0\n", 4096) = 2 + */ + bb_show_usage(); /* does not return */ /*return EXIT_FAILURE;*/ } |