src/java.base/unix/native/libnio/ch/FileChannelImpl.c

*** 274,278 ****
--- 274,306 ----
  #else
      return IOS_UNSUPPORTED_CASE;
  #endif
  }
  
+ JNIEXPORT jint JNICALL
+ Java_sun_nio_ch_FileChannelImpl_setDirect0(JNIEnv *env, jobject this, jobject fObj)
+ {
+     jint fd = fdval(env, fObj);
+     jint result;
+ 
+ #ifdef O_DIRECT
+     result = fcntl(fd, F_SETFL, O_DIRECT);
+     if (result == -1) {
+         JNU_ThrowIOExceptionWithLastError(env, "DirectIO setup failed");
+     }
+     return result;
+ #elif F_NOCACHE
+     result = fcntl(fd, F_NOCACHE, 1);
+     if (result == -1) {
+         JNU_ThrowIOExceptionWithLastError(env, "DirectIO setup failed");
+     }
+     return result;
+ //#elif DIRECTIO_ON
+ //    result = directio(fd, DIRECTIO_ON);
+ //    if (result == -1) {
+ //        JNU_ThrowIOExceptionWithLastError(env, "DirectIO setup failed");
+ //    }
+     return result;
+ #else
+     return -1;
+ #endif
+ }