SPI Programming Considerations for TMF
HP NonStop TMF Management Programming Manual—540140-008
3-7
Error Handling
TMF can return an empty response if an application returns a ZSPI-TKN-
CONTEXT token to the TMFSERVE process and there are no more responses to
be returned. The return token ZSPI-TKN-RETCODE in an empty response record
always has the value ZTMF-ERR-EMPTYRESPONSE.
6. Take action appropriate to the information in the response.
The response buffer always contains the return token, ZSPI-TKN-RETCODE. The
value of the ZSPI-TKN-RETCODE token is either zero (to indicate that the command is
successful), or it is a non-zero error number (to indicate that the command was not
performed). The command can contain error lists in either case.
TMF supports multiple occurrences of the same token in responses for specific
commands, and the TMFSERVE process returns multiple instances of the same token
in responses for these commands.
TMF returns multiple response records in its responses to some commands, as
described in the SPI Programming Manual. A response record normally contains
response information for the operation of the command on a single object.
The recommended buffer size (in bytes) for all commands sent to TMF is ZMHS-VAL-
BUFLEN. The minimum buffer length is ZTMF-VAL-MINBUFLEN and the maximum
buffer length is ZTMF-VAL-MAXBUFLEN.
Although TMF generates responses for all commands, responses from some
commands (such as INFO AUDITTRAIL and STATUS AUDITTRAIL) must be obtained
from fields within an extensible structured token. The token in this example contains all
of the information about audit trails that is available from the TMFSERVE process. To
refer to a field within an extensible structured token, you must first obtain the entire
structured token using SSGET. Then you refer to the fields of the structure using the
defined field names.
The TMFSERVE process does not provide support for selecting the types of responses
to be returned with the SPI standard token ZSPI-TKN-RESPONSE-TYPE. TMF always
returns a response for every object—whether or not errors or warnings occurred for the
object. For more information about sending messages to TMFSERVE and receiving
the responses, see the SPI Programming Manual.
Error Handling
Each response returned by TMF includes a return token (ZSPI-TKN-RETCODE),
whose value indicates whether an error occurred when TMF attempted to perform the
command. An error is a serious condition that prevents the command from being
completed. If the command completed with no errors, the value of the return token is
zero. If ZSPI-TKN-RETCODE has any non-zero value, this means that an error
occurred. In this case, TMF includes an error list in the response, providing information
about the error.
A warning reports a condition less serious than that of an error. If no errors occurred
but a warning did occur, the return token has a value of zero, but an error list appears
in the response, providing information about the warning condition.
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