For a directed subsystem request, the SSI returns one of the following decimal return codes in register 15:

Return Code

(Decimal)

Meaning

SSRTOK (0)

Successful completion — the request went to the subsystem.

SSRTNSUP (4)

The subsystem does not support this function.

SSRTNTUP (8)

The subsystem exists, but is not active.

SSRTNOSS (12)

The subsystem is not defined to MVS™.

SSRTDIST (16)

The pointer to the SSOB control block or the SSIB control block is not valid, or the function code specified in the SSOBFUNC field is greater than the maximum number of functions supported by the subsystem specified in the SSIBSSNM field.

SSRTLERR (20)

The SSOB or SSIB have invalid lengths or formats

SSRTNSSI (24)

The SSI has not been initialized.

If the return code in register 15 is zero, the SSI was able to pass the request to the subsystem, and the SSOB function dependent area might contain information returned by the subsystem. The contents of the return code in the SSOB (SSOBRETN), and other fields, depend on which function you requested.