The full block device names are returned, eg. C</dev/sda>
-
This function returns a NULL-terminated array of strings
(like L<environ(3)>), or NULL if there was an error.
I<The caller must free the strings and the array after use>.
underlying disk image.
You should always call this if you have modified a disk image, before
-calling C<guestfs_close>.
+closing the handle.
This function returns 0 on success or -1 on error.