Specify user data
void ssSetUserData(SimStruct *S, void *data)
SimStruct that represents an S-Function block.
Stores a pointer to the memory location containing the S-function's user data. To
avoid memory leaks, the S-function must free this memory location during the call to
An S-function containing user data must perform the following steps.
Allocate memory for the user data, using a customized structure to store more complicated data.
mdlInitializeSizes, to ensure the Simulink® engine always calls the
Store the pointer to the memory location in the user data, using a call to
ssGetUserDatato retrieve the pointer to the memory location and free the memory.
See Creating Run-Time Parameters from Multiple S-Function Parameters for an example that uses user data in conjunction with run-time parameters.
You cannot access user data from within a Target Language Compiler (TLC) file.
Use DWork vectors instead of user data if you need to write a TLC-file to inline
the S-function during code generation with Simulink
Coder™. For an example using DWork vectors, see
See the S-function
sfun_runtime4.c used in
Introduced before R2006a