5 #include <linux/dm-ioctl.h>
9 #define DM_CRYPT_BUF_SIZE 4096
11 static void ioctl_init(struct dm_ioctl *io, size_t dataSize, const char *name, unsigned flags)
13 memset(io, 0, dataSize);
14 io->data_size = dataSize;
15 io->data_start = sizeof(struct dm_ioctl);
21 strncpy(io->name, name, sizeof(io->name));
25 int main(int argc, char *argv[])
27 char buffer[DM_CRYPT_BUF_SIZE];
29 struct dm_target_versions *v;
33 fd = open("/dev/device-mapper", O_RDWR);
35 fprintf(stderr, "Cannot open /dev/device-mapper\n");
39 io = (struct dm_ioctl *) buffer;
41 ioctl_init(io, DM_CRYPT_BUF_SIZE, NULL, 0);
43 if (ioctl(fd, DM_LIST_VERSIONS, io)) {
44 fprintf(stderr, "ioctl(DM_LIST_VERSIONS) returned an error\n");
48 /* Iterate over the returned versions, and print each subsystem's version */
49 v = (struct dm_target_versions *) &buffer[sizeof(struct dm_ioctl)];
51 printf("%s: %d.%d.%d\n", v->name, v->version[0], v->version[1], v->version[2]);
52 v = (struct dm_target_versions *)(((char *)v) + v->next);