1/*
2 * Copyright (c) 1997, 2013, 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 <unistd.h>
27#include <fcntl.h>
28
29#include "jni.h"
30#include "jni_util.h"
31#include "jvm.h"
32
33#include "io_util_md.h"
34#include "java_io_FileDescriptor.h"
35
36/*******************************************************************/
37/*  BEGIN JNI ********* BEGIN JNI *********** BEGIN JNI ************/
38/*******************************************************************/
39
40/* field id for jint 'fd' in java.io.FileDescriptor */
41jfieldID IO_fd_fdID;
42
43/* field id for jboolean 'append' in java.io.FileDescriptor */
44jfieldID IO_append_fdID;
45
46/**************************************************************
47 * static methods to store field ID's in initializers
48 */
49
50JNIEXPORT void JNICALL
51Java_java_io_FileDescriptor_initIDs(JNIEnv *env, jclass fdClass) {
52    CHECK_NULL(IO_fd_fdID = (*env)->GetFieldID(env, fdClass, "fd", "I"));
53    CHECK_NULL(IO_append_fdID = (*env)->GetFieldID(env, fdClass, "append", "Z"));
54}
55
56/**************************************************************
57 * File Descriptor
58 */
59
60JNIEXPORT void JNICALL
61Java_java_io_FileDescriptor_sync(JNIEnv *env, jobject this) {
62    FD fd = THIS_FD(this);
63    if (IO_Sync(fd) == -1) {
64        JNU_ThrowByName(env, "java/io/SyncFailedException", "sync failed");
65    }
66}
67
68JNIEXPORT jboolean JNICALL
69Java_java_io_FileDescriptor_getAppend(JNIEnv *env, jclass fdClass, jint fd) {
70    int flags = fcntl(fd, F_GETFL);
71    return ((flags & O_APPEND) == 0) ? JNI_FALSE : JNI_TRUE;
72}
73