mex: is_rosetta()

Author: scivision

private/get_mex_sources.m

@@ -8,6 +8,7 @@
 % Matlab and Java don't have these functions
 srcs = {fullfile(top, "src/is_char_device.cpp"), ...
   fullfile(top, "src/set_permissions.cpp"), ...
+  fullfile(top, "src/is_rosetta.cpp"), ...
 };
 
 s = fullfile(top, "src/windows_shortname.cpp");

src/is_rosetta.cpp

@@ -0,0 +1,52 @@
+#include "mex.hpp"
+#include "mexAdapter.hpp"
+
+#include <vector>
+#include <memory>
+
+
+#if defined(__APPLE__) && defined(__MACH__)
+#include <cerrno>
+#include <sys/sysctl.h>
+#endif
+
+static bool fs_is_rosetta()
+{
+#if defined(__APPLE__) && defined(__MACH__)
+// https://developer.apple.com/documentation/apple-silicon/about-the-rosetta-translation-environment
+    int ret = 0;
+    size_t size = sizeof(ret);
+
+    if (sysctlbyname("sysctl.proc_translated", &ret, &size, nullptr, 0) < 0)
+      return false;
+
+    return ret == 1;
+#else
+    return false;
+#endif
+}
+
+
+class MexFunction : public matlab::mex::Function {
+public:
+  void operator()(matlab::mex::ArgumentList outputs, matlab::mex::ArgumentList inputs) {
+// boilerplate engine & ArrayFactory setup
+    std::shared_ptr<matlab::engine::MATLABEngine> matlabPtr = getEngine();
+
+    matlab::data::ArrayFactory factory;
+// boilerplate input checks
+    if (inputs.size() != 0) {
+      matlabPtr->feval(u"error", 0,
+        std::vector<matlab::data::Array>({ factory.createScalar("No input required") }));
+    }
+
+// actual function algorithm / computation
+    bool y = fs_is_rosetta();
+
+// convert to Matlab output
+// https://www.mathworks.com/help/matlab/matlab_external/create-matlab-array-with-matlab-data-cpp-api.html
+// https://www.mathworks.com/help/matlab/apiref/matlab.data.arrayfactory.html
+
+    outputs[0] = factory.createScalar<bool>(y);
+  }
+};