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      1 /*
      2  * Copyright (c) 1997, 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 #include <sys/socket.h>
     26 #include <sys/types.h>
     27 
     28 #include "jni.h"
     29 #include "jni_util.h"
     30 #include "jvm.h"
     31 
     32 #include "JNIHelp.h"
     33 
     34 #define NATIVE_METHOD(className, functionName, signature) \
     35 { #functionName, signature, (void*)(className ## _ ## functionName) }
     36 
     37 /*******************************************************************/
     38 /*  BEGIN JNI ********* BEGIN JNI *********** BEGIN JNI ************/
     39 /*******************************************************************/
     40 
     41 /* field id for jint 'fd' in java.io.FileDescriptor */
     42 jfieldID IO_fd_fdID;
     43 
     44 /**************************************************************
     45  * static methods to store field ID's in initializers
     46  */
     47 
     48 static void FileDescriptor_initIDs(JNIEnv *env) {
     49     jclass fdClass = (*env)->FindClass(env, "java/io/FileDescriptor");
     50     IO_fd_fdID = (*env)->GetFieldID(env, fdClass, "descriptor", "I");
     51 }
     52 
     53 /**************************************************************
     54  * File Descriptor
     55  */
     56 
     57 JNIEXPORT void JNICALL
     58 FileDescriptor_sync(JNIEnv *env, jobject this) {
     59     int fd = (*env)->GetIntField(env, this, IO_fd_fdID);
     60     if (JVM_Sync(fd) == -1) {
     61         JNU_ThrowByName(env, "java/io/SyncFailedException", "sync failed");
     62     }
     63 }
     64 
     65 JNIEXPORT jboolean JNICALL FileDescriptor_isSocket(JNIEnv *env, jclass ignored, jint fd) {
     66     int error;
     67     socklen_t error_length = sizeof(error);
     68     return TEMP_FAILURE_RETRY(getsockopt(fd, SOL_SOCKET, SO_ERROR, &error, &error_length)) == 0;
     69 }
     70 
     71 static JNINativeMethod gMethods[] = {
     72   NATIVE_METHOD(FileDescriptor, sync, "()V"),
     73   NATIVE_METHOD(FileDescriptor, isSocket, "(I)Z"),
     74 };
     75 
     76 void register_java_io_FileDescriptor(JNIEnv* env) {
     77     jniRegisterNativeMethods(env, "java/io/FileDescriptor", gMethods, NELEM(gMethods));
     78 
     79     FileDescriptor_initIDs(env);
     80 }
     81