By issuing the dc_clt_get_trnid_s function, the CUP can collect the current transaction global identifiers and transaction branch identifiers.

A transaction global identifier is needed to check whether the transaction started from the CUP has been committed when an error occurs. After any of the following functions is issued for possible errors, the dc_clt_get_trnid_s function must be issued:

• dc_trn_begin_s function
• dc_trn_chained_commit_s function
• dc_trn_chained_rollback_s function