int sysfs_init(struct sysfs_cxt *cxt, dev_t devno, struct sysfs_cxt *parent)
{
char path[PATH_MAX];
int fd, rc;
memset(cxt, 0, sizeof(*cxt));
cxt->dir_fd = -1;
if (!sysfs_devno_path(devno, path, sizeof(path)))
goto err;
fd = open(path, O_RDONLY|O_CLOEXEC);
if (fd < 0)
goto err;
cxt->dir_fd = fd;
cxt->dir_path = strdup(path);
if (!cxt->dir_path)
goto err;
cxt->devno = devno;
cxt->parent = parent;
return 0;
err:
rc = errno > 0 ? -errno : -1;
sysfs_deinit(cxt);
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;
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");
printf("NAME: %s\n", devname);
printf("DEVNO: %u\n", (unsigned int) 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",
sysfs_devno_has_attribute(devno, "partition") ? "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);
}
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;
}
