1 /*
   2  * Copyright (c) 2003, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.  Oracle designates this
   8  * particular file as subject to the "Classpath" exception as provided
   9  * by Oracle in the LICENSE file that accompanied this code.
  10  *
  11  * This code is distributed in the hope that it will be useful, but WITHOUT
  12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  14  * version 2 for more details (a copy is included in the LICENSE file that
  15  * accompanied this code).
  16  *
  17  * You should have received a copy of the GNU General Public License version
  18  * 2 along with this work; if not, write to the Free Software Foundation,
  19  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  20  *
  21  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  22  * or visit www.oracle.com if you need additional information or have any
  23  * questions.
  24  */
  25 
  26 #include "jni.h"
  27 #include "jni_util.h"
  28 #include "jvm.h"
  29 #include "io_util.h"
  30 #include "jlong.h"
  31 #include "io_util_md.h"
  32 
  33 #include "java_io_FileDescriptor.h"
  34 
  35 /*******************************************************************/
  36 /*  BEGIN JNI ********* BEGIN JNI *********** BEGIN JNI ************/
  37 /*******************************************************************/
  38 
  39 /* field id for jint 'fd' in java.io.FileDescriptor */
  40 jfieldID IO_fd_fdID;
  41 
  42 /* field id for jlong 'handle' in java.io.FileDescriptor */
  43 jfieldID IO_handle_fdID;
  44 
  45 /**************************************************************
  46  * static methods to store field IDs in initializers
  47  */
  48 
  49 JNIEXPORT void JNICALL
  50 Java_java_io_FileDescriptor_initIDs(JNIEnv *env, jclass fdClass) {
  51     CHECK_NULL(IO_fd_fdID = (*env)->GetFieldID(env, fdClass, "fd", "I"));
  52     CHECK_NULL(IO_handle_fdID = (*env)->GetFieldID(env, fdClass, "handle", "J"));
  53 }
  54 
  55 JNIEXPORT jlong JNICALL
  56 Java_java_io_FileDescriptor_set(JNIEnv *env, jclass fdClass, jint fd) {
  57     SET_HANDLE(fd);
  58 }
  59 
  60 /**************************************************************
  61  * File Descriptor
  62  */
  63 
  64 JNIEXPORT void JNICALL
  65 Java_java_io_FileDescriptor_sync(JNIEnv *env, jobject this) {
  66     FD fd = THIS_FD(this);
  67     if (IO_Sync(fd) == -1) {
  68         JNU_ThrowByName(env, "java/io/SyncFailedException", "sync failed");
  69     }
  70 }