1 /* 2 * Copyright (c) 2014, 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 <windows.h> 27 28 #include "jni_util.h" 29 #include "jlong.h" 30 #include "jdk_internal_jimage_concurrent_ConcurrentPReader.h" 31 32 static jfieldID handle_fdID; 33 34 JNIEXPORT void JNICALL 35 Java_jdk_internal_jimage_concurrent_ConcurrentPReader_initIDs(JNIEnv *env, jclass clazz) 36 { 37 CHECK_NULL(clazz = (*env)->FindClass(env, "java/io/FileDescriptor")); 38 CHECK_NULL(handle_fdID = (*env)->GetFieldID(env, clazz, "handle", "J")); 39 } 40 41 JNIEXPORT jint JNICALL 42 Java_jdk_internal_jimage_concurrent_ConcurrentPReader_pread(JNIEnv *env, jclass clazz, 43 jobject fdo, jlong address, 44 jint len, jlong offset) 45 { 46 OVERLAPPED ov; 47 DWORD nread; 48 BOOL result; 49 50 jlong handle = (*env)->GetLongField(env, fdo, handle_fdID); 51 void *buf = (void *)jlong_to_ptr(address); 52 53 ZeroMemory(&ov, sizeof(ov)); 54 ov.Offset = (DWORD)offset; 55 ov.OffsetHigh = (DWORD)(offset >> 32); 56 57 result = ReadFile(handle, (LPVOID)buf, len, &nread, &ov); 58 if (result == 0) { 59 JNU_ThrowIOExceptionWithLastError(env, "ReadFile failed"); 60 } 61 62 return nread; 63 } 64