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The Simulink® software provides a set of functions for accessing the fields of an S-function's simulation data structure (SimStruct). S-function callback methods use these functions to store and retrieve information about an S-function.
Some SimStruct functions are available only in some of the languages supported by the Simulink software. The reference page for each SimStruct macro or function lists the languages in which it is available and gives the syntax for these languages.
The file simstruc.hsimstruc.h is a C language header file that defines the Simulink data structure and the SimStruct access macros. It encapsulates all the data relating to the model or S-function, including block parameters and outputs.
There is one SimStruct data structure allocated for the Simulink model. Each S-function in the model has its own SimStruct associated with it. The organization of these SimStructs is much like a directory tree. The SimStruct associated with the model is the root SimStruct. The SimStructs associated with the S-functions are the child SimStructs.