Non-JCL dynamic allocation functions

The keys listed in Table 1 and described on the following pages do not have JCL equivalents; they have meaning only when you request dynamic allocation by dsname (verb code 01). You can request that the system return information about either a dsname or a ddname dynamic allocation request by specifying either of the following:

• The non-JCL dynamic allocation functions keys 0055-0057, 005D, and 007B-007D, which request that the system return information about your dsname allocation request
• Information retrieval keys greater than C000, described in Dynamic information retrieval text units

For example, on Input the text unit initializes the PARM field to "AAAAAAAA". On Output the text unit contains the name "MYDD" and a LEN of X'0004'. Beyond the valid length (4 bytes) of "MYDD", the PARM field might contain data from the previous request ("MYDDAAAA").

        KEY  #     LEN    PARM
Input:  0055 0001  0008   C1C1C1C1C1C1C1C1

Output: 0055 0001  0004   D4E8C4C4C1C1C1C1

When you request information for multiple parameters, the LEN and PARM fields of the next parameter immediately follow the information returned from the previous parameter. For example, on Output the text unit below contains a second LEN and PARM pair. The request returns the information "X" in the PARM2 field. The information in the fields is contiguous; spaces are shown in the example only for readability.

        KEY  #     LEN1   PARM1     LEN2     PARM2
Output: nnnn 0002  0004   D4E8C4C4  0001     E7