Make fd non-iheritable in FileIO

Author: otethal

graalpython/com.oracle.graal.python/src/com/oracle/graal/python/builtins/modules/io/FileIOBuiltins.java

@@ -356,6 +356,12 @@ public PNone doInit(VirtualFrame frame, PFileIO self, Object nameobj, String mod
                         throw raise(ValueError, OPENER_RETURNED_D, self.getFD());
                     }
                 }
+                try {
+                    posixLib.setInheritable(getPosixSupport(), self.getFD(), false);
+                } catch (PosixSupportLibrary.PosixException e) {
+                    exceptionProfile.enter();
+                    throw raiseOSErrorFromPosixException(frame, e);
+                }
                 fdIsOwn = true;
             }
             self.setBlksize(DEFAULT_BUFFER_SIZE);

graalpython/com.oracle.graal.python/src/com/oracle/graal/python/runtime/ImageBuildtimePosixSupport.java

@@ -220,7 +220,10 @@ final boolean getInheritable(int fd,
     @ExportMessage
     final void setInheritable(int fd, boolean inheritable,
                     @CachedLibrary("this.nativePosixSupport") PosixSupportLibrary nativeLib) throws PosixException {
-        checkNotInImageBuildtime();
+        if (ImageInfo.inImageBuildtimeCode()) {
+            PosixSupportLibrary.getUncached().setInheritable(emulatedPosixSupport, fd, inheritable);
+            return;
+        }
         nativeLib.setInheritable(nativePosixSupport, fd, inheritable);
     }