| /* |
| * Licensed to the Apache Software Foundation (ASF) under one or more |
| * contributor license agreements. See the NOTICE file distributed with |
| * this work for additional information regarding copyright ownership. |
| * The ASF licenses this file to You under the Apache License, Version 2.0 |
| * (the "License"); you may not use this file except in compliance with |
| * the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| #include <jni.h> |
| #include "file_descriptor.h" |
| #include "org_apache_hadoop.h" |
| |
| // class of java.io.FileDescriptor |
| static jclass fd_class; |
| // the internal field for the integer fd |
| static jfieldID fd_descriptor; |
| // the no-argument constructor |
| static jmethodID fd_constructor; |
| |
| #ifdef WINDOWS |
| // the internal field for the long handle |
| static jfieldID fd_handle; |
| #endif |
| |
| void fd_init(JNIEnv* env) |
| { |
| if (fd_class != NULL) return; // already initted |
| |
| fd_class = (*env)->FindClass(env, "java/io/FileDescriptor"); |
| PASS_EXCEPTIONS(env); |
| fd_class = (*env)->NewGlobalRef(env, fd_class); |
| |
| fd_descriptor = (*env)->GetFieldID(env, fd_class, "fd", "I"); |
| PASS_EXCEPTIONS(env); |
| |
| #ifdef WINDOWS |
| fd_handle = (*env)->GetFieldID(env, fd_class, "handle", "J"); |
| PASS_EXCEPTIONS(env); |
| #endif |
| |
| fd_constructor = (*env)->GetMethodID(env, fd_class, "<init>", "()V"); |
| } |
| |
| void fd_deinit(JNIEnv *env) { |
| if (fd_class != NULL) { |
| (*env)->DeleteGlobalRef(env, fd_class); |
| fd_class = NULL; |
| } |
| fd_descriptor = NULL; |
| #ifdef WINDOWS |
| fd_handle = NULL; |
| #endif |
| fd_constructor = NULL; |
| } |
| |
| #ifdef UNIX |
| /* |
| * Given an instance 'obj' of java.io.FileDescriptor, return the |
| * underlying fd, or throw if unavailable |
| */ |
| int fd_get(JNIEnv* env, jobject obj) { |
| if (obj == NULL) { |
| THROW(env, "java/lang/NullPointerException", |
| "FileDescriptor object is null"); |
| return -1; |
| } |
| return (*env)->GetIntField(env, obj, fd_descriptor); |
| } |
| |
| /* |
| * Create a FileDescriptor object corresponding to the given int fd |
| */ |
| jobject fd_create(JNIEnv *env, int fd) { |
| jobject obj = (*env)->NewObject(env, fd_class, fd_constructor); |
| PASS_EXCEPTIONS_RET(env, NULL); |
| |
| (*env)->SetIntField(env, obj, fd_descriptor, fd); |
| return obj; |
| } |
| #endif |
| |
| #ifdef WINDOWS |
| /* |
| * Given an instance 'obj' of java.io.FileDescriptor, return the |
| * underlying fd, or throw if unavailable |
| */ |
| long fd_get(JNIEnv* env, jobject obj) { |
| if (obj == NULL) { |
| THROW(env, "java/lang/NullPointerException", |
| "FileDescriptor object is null"); |
| return -1; |
| } |
| return (long) (*env)->GetLongField(env, obj, fd_handle); |
| } |
| |
| /* |
| * Create a FileDescriptor object corresponding to the given int fd |
| */ |
| jobject fd_create(JNIEnv *env, long fd) { |
| jobject obj = (*env)->NewObject(env, fd_class, fd_constructor); |
| PASS_EXCEPTIONS_RET(env, (jobject) NULL); |
| |
| (*env)->SetLongField(env, obj, fd_handle, fd); |
| return obj; |
| } |
| #endif |