static int get_partition_start(int fd, int partno, uint64_t *start)
{
struct stat st;
struct sysfs_cxt disk = UL_SYSFSCXT_EMPTY,
part = UL_SYSFSCXT_EMPTY;
dev_t devno = 0;
int rc = -1;
/*
* wholedisk
*/
if (fstat(fd, &st) || !S_ISBLK(st.st_mode))
goto done;
devno = st.st_rdev;
if (sysfs_init(&disk, devno, NULL))
goto done;
/*
* partition
*/
devno = sysfs_partno_to_devno(&disk, partno);
if (!devno)
goto done;
if (sysfs_init(&part, devno, &disk))
goto done;
if (sysfs_read_u64(&part, "start", start))
goto done;
rc = 0;
done:
sysfs_deinit(&part);
sysfs_deinit(&disk);
return rc;
}
int main(int argc, char *argv[])
{
struct sysfs_cxt cxt = UL_SYSFSCXT_EMPTY;
char *devname;
dev_t devno;
char path[PATH_MAX];
int i, is_part;
uint64_t u64;
ssize_t len;
if (argc != 2)
errx(EXIT_FAILURE, "usage: %s <devname>", argv[0]);
devname = argv[1];
devno = sysfs_devname_to_devno(devname, NULL);
if (!devno)
err(EXIT_FAILURE, "failed to read devno");
is_part = sysfs_devno_has_attribute(devno, "partition");
printf("NAME: %s\n", devname);
printf("DEVNO: %u (%d:%d)\n", (unsigned int) devno, major(devno), minor(devno));
printf("DEVNOPATH: %s\n", sysfs_devno_path(devno, path, sizeof(path)));
printf("DEVPATH: %s\n", sysfs_devno_to_devpath(devno, path, sizeof(path)));
printf("PARTITION: %s\n", is_part ? "YES" : "NOT");
if (sysfs_init(&cxt, devno, NULL))
return EXIT_FAILURE;
len = sysfs_readlink(&cxt, NULL, path, sizeof(path) - 1);
if (len > 0) {
path[len] = '\0';
printf("DEVNOLINK: %s\n", path);
}
if (!is_part) {
printf("First 5 partitions:\n");
for (i = 1; i <= 5; i++) {
dev_t dev = sysfs_partno_to_devno(&cxt, i);
if (dev)
printf("\t#%d %d:%d\n", i, major(dev), minor(dev));
}
}
printf("SLAVES: %d\n", sysfs_count_dirents(&cxt, "slaves"));
if (sysfs_read_u64(&cxt, "size", &u64))
printf("read SIZE failed\n");
else
printf("SIZE: %jd\n", u64);
if (sysfs_read_int(&cxt, "queue/hw_sector_size", &i))
printf("read SECTOR failed\n");
else
printf("SECTOR: %d\n", i);
printf("DEVNAME: %s\n", sysfs_get_devname(&cxt, path, sizeof(path)));
sysfs_deinit(&cxt);
return EXIT_SUCCESS;
}