- There is a function called fileattrib, but in my case (Windows), it didn't work properly the last time I worked with it.
- Also, you can try with fopen, when the file is in use, check what is returned when you call the function.
From the documentation
fileID = fopen(filename) opens the file, filename, for binary read access, and returns an integer file identifier equal to or greater than 3. MATLAB® reserves file identifiers 0, 1, and 2 for standard input, standard output (the screen), and standard error, respectively.
If fopen cannot open the file, then fileID is -1.
- If this interface is some sort of program/process, you can check here
