--- a/src/java.base/unix/native/libjava/FileOutputStream_md.c	Wed Jun 13 13:48:39 2018 -0400
+++ b/src/java.base/unix/native/libjava/FileOutputStream_md.c	Wed Jun 13 20:11:18 2018 +0200
@@ -70,7 +70,3 @@
     writeBytes(env, this, bytes, off, len, append, fos_fd);
 }
 
-void JNICALL
-Java_java_io_FileOutputStream_close0(JNIEnv *env, jobject this) {
-    fileClose(env, this, fos_fd);
-}

--- a/src/java.base/unix/native/libjava/io_util_md.c	Wed Jun 13 13:48:39 2018 -0400
+++ b/src/java.base/unix/native/libjava/io_util_md.c	Wed Jun 13 20:11:18 2018 +0200
@@ -121,16 +121,6 @@
     } END_PLATFORM_STRING(env, ps);
 }
 
-void
-fileClose(JNIEnv *env, jobject this, jfieldID fid)
-{
-    jobject fileDescriptor = (*env)->GetObjectField(env, (this), (fid));
-    if (fileDescriptor == NULL) {
-        return;
-    }
-    fileDescriptorClose(env, fileDescriptor);
-}
-
 // Function to close the fd held by this FileDescriptor and set fd to -1.
 void
 fileDescriptorClose(JNIEnv *env, jobject this)

--- a/src/java.base/unix/native/libjava/io_util_md.h	Wed Jun 13 13:48:39 2018 -0400
+++ b/src/java.base/unix/native/libjava/io_util_md.h	Wed Jun 13 20:11:18 2018 +0200
@@ -99,10 +99,6 @@
     } while((_result == -1) && (errno == EINTR)); \
 } while(0)
 
-/*
- * IO helper function(s)
- */
-void fileClose(JNIEnv *env, jobject this, jfieldID fid);
 void fileDescriptorClose(JNIEnv *env, jobject this);
 
 #ifdef MACOSX

--- a/src/java.base/windows/native/libjava/FileOutputStream_md.c	Wed Jun 13 13:48:39 2018 -0400
+++ b/src/java.base/windows/native/libjava/FileOutputStream_md.c	Wed Jun 13 20:11:18 2018 +0200
@@ -72,7 +72,3 @@
     writeBytes(env, this, bytes, off, len, append, fos_fd);
 }
 
-JNIEXPORT void JNICALL
-Java_java_io_FileOutputStream_close0(JNIEnv *env, jobject this) {
-        handleClose(env, this, fos_fd);
-}

--- a/src/java.base/windows/native/libjava/io_util_md.c	Wed Jun 13 13:48:39 2018 -0400
+++ b/src/java.base/windows/native/libjava/io_util_md.c	Wed Jun 13 20:11:18 2018 +0200
@@ -535,16 +535,6 @@
     return writeInternal(fd, buf, len, JNI_TRUE);
 }
 
-void
-handleClose(JNIEnv *env, jobject this, jfieldID fid)
-{
-    jobject fileDescriptor = (*env)->GetObjectField(env, (this), (fid));
-    if (fileDescriptor == NULL) {
-        return;
-    }
-    fileDescriptorClose(env, fileDescriptor);
-}
-
 // Function to close the fd held by this FileDescriptor and set fd to -1.
 void
 fileDescriptorClose(JNIEnv *env, jobject this)

--- a/src/java.base/windows/native/libjava/io_util_md.h	Wed Jun 13 13:48:39 2018 -0400
+++ b/src/java.base/windows/native/libjava/io_util_md.h	Wed Jun 13 20:11:18 2018 +0200
@@ -48,7 +48,6 @@
 JNIEXPORT jint handleRead(FD fd, void *buf, jint len);
 jint handleWrite(FD fd, const void *buf, jint len);
 jint handleAppend(FD fd, const void *buf, jint len);
-void handleClose(JNIEnv *env, jobject this, jfieldID fid);
 void fileDescriptorClose(JNIEnv *env, jobject this);
 JNIEXPORT jlong JNICALL
 handleLseek(FD fd, jlong offset, jint whence);