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 <unistd.h> 27 #include <errno.h> 28 29 #include "jni.h" 30 #include "jni_util.h" 31 #include "jlong.h" 32 #include "jdk_internal_jimage_concurrent_ConcurrentPReader.h" 33 34 #ifdef _ALLBSD_SOURCE 35 #define pread64 pread 36 #endif 37 38 #define RESTARTABLE(_cmd, _result) do { \ 39 do { \ 40 _result = _cmd; \ 41 } while((_result == -1) && (errno == EINTR)); \ 42 } while(0) 43 44 static jfieldID fd_fdID; 45 46 JNIEXPORT void JNICALL 47 Java_jdk_internal_jimage_concurrent_ConcurrentPReader_initIDs(JNIEnv *env, jclass clazz) 48 { 49 CHECK_NULL(clazz = (*env)->FindClass(env, "java/io/FileDescriptor")); 50 CHECK_NULL(fd_fdID = (*env)->GetFieldID(env, clazz, "fd", "I")); 51 } 52 53 JNIEXPORT jint JNICALL 54 Java_jdk_internal_jimage_concurrent_ConcurrentPReader_pread(JNIEnv *env, jclass clazz, 55 jobject fdo, jlong address, 56 jint len, jlong offset) 57 { 58 jint fd = (*env)->GetIntField(env, fdo, fd_fdID); 59 void *buf = (void *)jlong_to_ptr(address); 60 int res; 61 RESTARTABLE(pread64(fd, buf, len, offset), res); 62 if (res == -1) { 63 JNU_ThrowIOExceptionWithLastError(env, "pread failed"); 64 } 65 return res; 66 }