A path name in the Gfarm filesystem.
GFARM_ACL_TYPE_ACCESS (to get the access ACL) or GFARM_ACL_TYPE_DEFAULT (to get the default ACL).
A pointer of ACL structure type.
The function terminated successfully.
The gfarm_url does not exist or The gfarm_url does not have the type of ACL.
Insufficient memory was available.
An error except the above occurred. The reason is shown by gfarm_error_string(3).