1/* 2 * Copyright (c) 2000, 2015, 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 <sys/types.h> 27#include <string.h> 28#include <sys/resource.h> 29 30#include "jni.h" 31#include "jni_util.h" 32#include "jvm.h" 33#include "jlong.h" 34#include "sun_nio_ch_IOUtil.h" 35#include "java_lang_Integer.h" 36#include "nio.h" 37#include "nio_util.h" 38 39static jfieldID fd_fdID; /* for jint 'fd' in java.io.FileDescriptor */ 40 41 42JNIEXPORT void JNICALL 43Java_sun_nio_ch_IOUtil_initIDs(JNIEnv *env, jclass clazz) 44{ 45 CHECK_NULL(clazz = (*env)->FindClass(env, "java/io/FileDescriptor")); 46 CHECK_NULL(fd_fdID = (*env)->GetFieldID(env, clazz, "fd", "I")); 47} 48 49JNIEXPORT jboolean JNICALL 50Java_sun_nio_ch_IOUtil_randomBytes(JNIEnv *env, jclass clazz, 51 jbyteArray randArray) 52{ 53 JNU_ThrowByName(env, "java/lang/UnsupportedOperationException", NULL); 54 return JNI_FALSE; 55} 56 57JNIEXPORT jint JNICALL 58Java_sun_nio_ch_IOUtil_fdVal(JNIEnv *env, jclass clazz, jobject fdo) 59{ 60 return (*env)->GetIntField(env, fdo, fd_fdID); 61} 62 63JNIEXPORT void JNICALL 64Java_sun_nio_ch_IOUtil_setfdVal(JNIEnv *env, jclass clazz, jobject fdo, jint val) 65{ 66 (*env)->SetIntField(env, fdo, fd_fdID, val); 67} 68 69static int 70configureBlocking(int fd, jboolean blocking) 71{ 72 int flags = fcntl(fd, F_GETFL); 73 int newflags = blocking ? (flags & ~O_NONBLOCK) : (flags | O_NONBLOCK); 74 75 return (flags == newflags) ? 0 : fcntl(fd, F_SETFL, newflags); 76} 77 78JNIEXPORT void JNICALL 79Java_sun_nio_ch_IOUtil_configureBlocking(JNIEnv *env, jclass clazz, 80 jobject fdo, jboolean blocking) 81{ 82 if (configureBlocking(fdval(env, fdo), blocking) < 0) 83 JNU_ThrowIOExceptionWithLastError(env, "Configure blocking failed"); 84} 85 86JNIEXPORT jlong JNICALL 87Java_sun_nio_ch_IOUtil_makePipe(JNIEnv *env, jobject this, jboolean blocking) 88{ 89 int fd[2]; 90 91 if (pipe(fd) < 0) { 92 JNU_ThrowIOExceptionWithLastError(env, "Pipe failed"); 93 return 0; 94 } 95 if (blocking == JNI_FALSE) { 96 if ((configureBlocking(fd[0], JNI_FALSE) < 0) 97 || (configureBlocking(fd[1], JNI_FALSE) < 0)) { 98 JNU_ThrowIOExceptionWithLastError(env, "Configure blocking failed"); 99 close(fd[0]); 100 close(fd[1]); 101 return 0; 102 } 103 } 104 return ((jlong) fd[0] << 32) | (jlong) fd[1]; 105} 106 107JNIEXPORT jboolean JNICALL 108Java_sun_nio_ch_IOUtil_drain(JNIEnv *env, jclass cl, jint fd) 109{ 110 char buf[128]; 111 int tn = 0; 112 113 for (;;) { 114 int n = read(fd, buf, sizeof(buf)); 115 tn += n; 116 if ((n < 0) && (errno != EAGAIN)) 117 JNU_ThrowIOExceptionWithLastError(env, "Drain"); 118 if (n == (int)sizeof(buf)) 119 continue; 120 return (tn > 0) ? JNI_TRUE : JNI_FALSE; 121 } 122} 123 124JNIEXPORT jint JNICALL 125Java_sun_nio_ch_IOUtil_fdLimit(JNIEnv *env, jclass this) 126{ 127 struct rlimit rlp; 128 if (getrlimit(RLIMIT_NOFILE, &rlp) < 0) { 129 JNU_ThrowIOExceptionWithLastError(env, "getrlimit failed"); 130 return -1; 131 } 132 if (rlp.rlim_max == RLIM_INFINITY || 133 rlp.rlim_max > (rlim_t)java_lang_Integer_MAX_VALUE) { 134 return java_lang_Integer_MAX_VALUE; 135 } else { 136 return (jint)rlp.rlim_max; 137 } 138} 139 140JNIEXPORT jint JNICALL 141Java_sun_nio_ch_IOUtil_iovMax(JNIEnv *env, jclass this) 142{ 143 jlong iov_max = sysconf(_SC_IOV_MAX); 144 if (iov_max == -1) 145 iov_max = 16; 146 return (jint)iov_max; 147} 148 149/* Declared in nio_util.h for use elsewhere in NIO */ 150 151jint 152convertReturnVal(JNIEnv *env, jint n, jboolean reading) 153{ 154 if (n > 0) /* Number of bytes written */ 155 return n; 156 else if (n == 0) { 157 if (reading) { 158 return IOS_EOF; /* EOF is -1 in javaland */ 159 } else { 160 return 0; 161 } 162 } 163 else if (errno == EAGAIN) 164 return IOS_UNAVAILABLE; 165 else if (errno == EINTR) 166 return IOS_INTERRUPTED; 167 else { 168 const char *msg = reading ? "Read failed" : "Write failed"; 169 JNU_ThrowIOExceptionWithLastError(env, msg); 170 return IOS_THROWN; 171 } 172} 173 174/* Declared in nio_util.h for use elsewhere in NIO */ 175 176jlong 177convertLongReturnVal(JNIEnv *env, jlong n, jboolean reading) 178{ 179 if (n > 0) /* Number of bytes written */ 180 return n; 181 else if (n == 0) { 182 if (reading) { 183 return IOS_EOF; /* EOF is -1 in javaland */ 184 } else { 185 return 0; 186 } 187 } 188 else if (errno == EAGAIN) 189 return IOS_UNAVAILABLE; 190 else if (errno == EINTR) 191 return IOS_INTERRUPTED; 192 else { 193 const char *msg = reading ? "Read failed" : "Write failed"; 194 JNU_ThrowIOExceptionWithLastError(env, msg); 195 return IOS_THROWN; 196 } 197} 198 199jint 200fdval(JNIEnv *env, jobject fdo) 201{ 202 return (*env)->GetIntField(env, fdo, fd_fdID); 203} 204