typedef struct job_info_msg {
           time_t last_update;     /* time of latest info */
           uint32_t record_count;  /* number of records */
           job_info_t *job_array;  /* the job records */
       } job_info_msg_t;

{
           last_update => 1285847672,
           job_array => [ {account => 'test', alloc_node => 'ln0', alloc_sid => 1234, ...},
                          {account => 'debug', alloc_node => 'ln2', alloc_sid => 5678, ...},
                          ...
                        ]
       }

$rc = $slurm->update_node({node_names => 'node[0-7]', node_state => NODE_STATE_DRAIN});