8.5.4 The RexxVariablePool() function This function is used to process a sequence of variable requests, and process them sequentially. The prototype of this function is: APIRET APIENTRY ULONG RexxVariablePool( SHVBLOCK *Request ) ; Its only parameter is a pointer to a SHVBLOCK structure, which may be the first of the linked list. The function performs the operation specified in each block. If an error should occur, the current request is terminated, and the function moves on to the next request in the chain. The result value is a bit peculiar. If the returned value is less than 128, it is calculated by logically OR'ing the returned shvret field of all the requests in the chain. That way, you can easily check whether any of the requests was e.g. skipped because of lack of memory. To determine which request, you have to iterate through the list. If the result value is higher than 127, it signifies an error. If any of these values are set, you can not assume that any of the requests have been processed. The following symbolic name gives its meaning. [RXSHV_NOAVL] Means that the interface is not available for this request. This might occur if the interface was not able to start the interpreter, or if an operation requested a variable when the interpreter is not currently executing any script (i.e. idle and waiting for a script to execute).