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1.15 Error Handling

If a QSMM API function returns a value of type int, then it can be an error code. All error codes are negative. Zero and positive return values may indicate additional information regarding successful completion of a function call. If a QSMM API function does not return a value of type int, it may not return an error code, because error condition cannot arise within the function, or at least this was assumed when the function had first appeared in the QSMM API.

If not otherwise noted in the description of an error code of a QSMM API function, returning the error code by the function means the system state remains unchanged, i.e. just after calling the function, the system retains its state it had just before calling the function.

To get the text description of an error code, the following API function from the header file qsmm.h can be used.

Function: const char * qsmm_err_str (int err)

This function returns the text description of QSMM API error code err. For invalid error codes, the string "(invalid error code)" is returned.

When you use the QSMM package for creating multinode models, you can associate an error handler with the model. In this case, the error handler may receive extended information on an error occurred. The use of an error handler may eliminate the need to check return codes of calls to QSMM API functions that have an argument of type qsmm_t to determine whether any of these functions have failed. See Error Handling for a Multinode Model, for information on using error handlers.

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