Giving additional resource(.so file) to an s-function and generate FMU

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Mayur
Mayur 2025-8-5
评论： Mayur 2025-8-14
I am generating FMU from a matlab s-function. The s-function needs an additional resource (.so file) to run and this is made available in the current path. No reference or definition given in s-function for this additional resource( I don't know how to give)
Issue: The FMU runs only when the additional resource (.so file) is in the current path else Matlab crashes. I want to run the FMU by having this additional resouce (.so file) inside FMU so that it can run on another PC. I tried creating a "resources/filename.so" inside MyModel.fmu unfortunately it doesn't helps.
Any thoughts?
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Mayur
Mayur 2025-8-6
Thanks @Meg Noah for your suggestion.
Yes. It works for running the sfunction. After that I am generating FMU and it fails to find the file while running the FMU. Also, manually copying the file inside FMU doesn't help

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回答（1 个）

Arushi
Arushi 2025-8-8
Hi Mayur,
If your S-function depends on a .so file and you're trying to generate a portable FMU that works across different machines, here's what worked best for me:
  • Include the .so file in the resources/ folder when exporting the FMU.
  • Modify your S-function C/C++ code to dynamically load the .so using dlopen() with the full path.
void* handle = dlopen("myLibrary.so", RTLD_NOW);
  • At runtime, the FMU is automatically extracted to a temporary directory. You can build the path to the .so file like this:
char path[PATH_MAX];
sprintf(path, "%s/resources/myLibrary.so", modelResourcePath);
void* handle = dlopen(path, RTLD_NOW);
modelResourcePath can be obtained from the FMU runtime or passed in using the FMI callback functions, depending on your setup.
This approach makes the FMU completely self-contained and portable.
Hope this helps!
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Arushi
Arushi 2025-8-14
Hi Mayur,
Since you’re on MATLAB R2021b, you can use the built-in Additional Files option when exporting the FMU to include your .so dependency directly inside the FMU package. This removes the need to unzip/re-zip the FMU manually.
Export Simulink Model to Standalone FMU
In the “Additional Files” section of the export dialog, you can specify:
  • binaries/<arch>/ for dependent libraries loaded automatically by the FMU binary, or
  • resources/ for files you plan to load manually (e.g. dlopen in your S-Function).
Once you add your .so here and adjust your S-Function to build the absolute path at runtime, your FMU should run without needing the .so in the working directory.

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