$DCBDYN – Call the dynamic DCB service routine

Use $DCBDYN macro as the interface to the $DCBDYN service routine to attach or detach a JES2 data control block (DCB) and data extent block (DEB) for a specified device control table (DCT).

Format description


                                             .-(--R1--)---.   
>>-+--------+--$DCBDYN--+-ATTACH-+--,DCT--=--+-label------+----><
   '-symbol-'           '-DETACH-'           '-(--R--n--)-'

ATTACH: Requests that a DCB and/or DEB (if one is required) be dynamically created. If the DCT does not require a DCB (for example, one has already been created), JES2 takes no further action.
DETACH: Requests that the specified DCB/DEB be dynamically deleted. If the DCT does not require a DCB or if there is no DCB already attached, JES2 takes no further action.
DCT=: Specifies a label or register containing the address of the DCT to either be attached or detached.

Return codes

The following return codes (in decimal) are returned in register 15.

Return Code: Meaning
0: DCB successfully ATTACHed or DETACHed as requested
4: DCB ATTACH failed (GETMAIN unsuccessful)

Format description

Return codes

Environment