On success, S3L_get_attribute returns S3L_SUCCESS.
S3L_get_attribute performs generic checking of the validity of the arrays it accepts as arguments. If an array argument contains an invalid or corrupted value, the function terminates and an error code indicating which value of the array handle was invalid is returned. See Appendix A of this manual for a detailed list of these error codes.
In addition, the following condition will cause the function to terminate and return the associated error code:
S3L_ERR_ATTR_INVALID - Invalid attribute; the supplied descriptor does not have the requested attribute type.