J. Duke | 319a3b9 | 2007-12-01 00:00:00 +0000 | [diff] [blame^] | 1 | /* |
| 2 | * Copyright 2000-2002 Sun Microsystems, Inc. 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. Sun designates this |
| 8 | * particular file as subject to the "Classpath" exception as provided |
| 9 | * by Sun 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, |
| 22 | * CA 95054 USA or visit www.sun.com if you need additional information or |
| 23 | * have any questions. |
| 24 | */ |
| 25 | |
| 26 | #include <sys/types.h> |
| 27 | #include <string.h> |
| 28 | #include "jni.h" |
| 29 | #include "jni_util.h" |
| 30 | #include "jvm.h" |
| 31 | #include "jlong.h" |
| 32 | #include "sun_nio_ch_IOUtil.h" |
| 33 | #include "nio.h" |
| 34 | #include "nio_util.h" |
| 35 | |
| 36 | static jfieldID fd_fdID; /* for jint 'fd' in java.io.FileDescriptor */ |
| 37 | |
| 38 | |
| 39 | JNIEXPORT void JNICALL |
| 40 | Java_sun_nio_ch_IOUtil_initIDs(JNIEnv *env, jclass clazz) |
| 41 | { |
| 42 | clazz = (*env)->FindClass(env, "java/io/FileDescriptor"); |
| 43 | fd_fdID = (*env)->GetFieldID(env, clazz, "fd", "I"); |
| 44 | } |
| 45 | |
| 46 | JNIEXPORT jboolean JNICALL |
| 47 | Java_sun_nio_ch_IOUtil_randomBytes(JNIEnv *env, jclass clazz, |
| 48 | jbyteArray randArray) |
| 49 | { |
| 50 | JNU_ThrowByName(env, "java/lang/UnsupportedOperationException", NULL); |
| 51 | return JNI_FALSE; |
| 52 | } |
| 53 | |
| 54 | JNIEXPORT jint JNICALL |
| 55 | Java_sun_nio_ch_IOUtil_fdVal(JNIEnv *env, jclass clazz, jobject fdo) |
| 56 | { |
| 57 | return (*env)->GetIntField(env, fdo, fd_fdID); |
| 58 | } |
| 59 | |
| 60 | JNIEXPORT void JNICALL |
| 61 | Java_sun_nio_ch_IOUtil_setfdVal(JNIEnv *env, jclass clazz, jobject fdo, jint val) |
| 62 | { |
| 63 | (*env)->SetIntField(env, fdo, fd_fdID, val); |
| 64 | } |
| 65 | |
| 66 | static int |
| 67 | configureBlocking(int fd, jboolean blocking) |
| 68 | { |
| 69 | int flags = fcntl(fd, F_GETFL); |
| 70 | |
| 71 | if ((blocking == JNI_FALSE) && !(flags & O_NONBLOCK)) |
| 72 | return fcntl(fd, F_SETFL, flags | O_NONBLOCK); |
| 73 | else if ((blocking == JNI_TRUE) && (flags & O_NONBLOCK)) |
| 74 | return fcntl(fd, F_SETFL, flags & ~O_NONBLOCK); |
| 75 | return 0; |
| 76 | } |
| 77 | |
| 78 | JNIEXPORT void JNICALL |
| 79 | Java_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 | |
| 86 | JNIEXPORT void JNICALL |
| 87 | Java_sun_nio_ch_IOUtil_initPipe(JNIEnv *env, jobject this, |
| 88 | jintArray intArray, jboolean block) |
| 89 | { |
| 90 | int fd[2]; |
| 91 | jint *ptr = 0; |
| 92 | |
| 93 | if (pipe(fd) < 0) { |
| 94 | JNU_ThrowIOExceptionWithLastError(env, "Pipe failed"); |
| 95 | return; |
| 96 | } |
| 97 | if (block == JNI_FALSE) { |
| 98 | if ((configureBlocking(fd[0], JNI_FALSE) < 0) |
| 99 | || (configureBlocking(fd[1], JNI_FALSE) < 0)) { |
| 100 | JNU_ThrowIOExceptionWithLastError(env, "Configure blocking failed"); |
| 101 | } |
| 102 | } |
| 103 | ptr = (*env)->GetPrimitiveArrayCritical(env, intArray, 0); |
| 104 | ptr[0] = fd[0]; |
| 105 | ptr[1] = fd[1]; |
| 106 | (*env)->ReleasePrimitiveArrayCritical(env, intArray, ptr, 0); |
| 107 | } |
| 108 | |
| 109 | JNIEXPORT jboolean JNICALL |
| 110 | Java_sun_nio_ch_IOUtil_drain(JNIEnv *env, jclass cl, jint fd) |
| 111 | { |
| 112 | char buf[128]; |
| 113 | int tn = 0; |
| 114 | |
| 115 | for (;;) { |
| 116 | int n = read(fd, buf, sizeof(buf)); |
| 117 | tn += n; |
| 118 | if ((n < 0) && (errno != EAGAIN)) |
| 119 | JNU_ThrowIOExceptionWithLastError(env, "Drain"); |
| 120 | if (n == (int)sizeof(buf)) |
| 121 | continue; |
| 122 | return (tn > 0) ? JNI_TRUE : JNI_FALSE; |
| 123 | } |
| 124 | } |
| 125 | |
| 126 | |
| 127 | /* Declared in nio_util.h for use elsewhere in NIO */ |
| 128 | |
| 129 | jint |
| 130 | convertReturnVal(JNIEnv *env, jint n, jboolean reading) |
| 131 | { |
| 132 | if (n > 0) /* Number of bytes written */ |
| 133 | return n; |
| 134 | if (n < 0) { |
| 135 | if (errno == EAGAIN) |
| 136 | return IOS_UNAVAILABLE; |
| 137 | if (errno == EINTR) |
| 138 | return IOS_INTERRUPTED; |
| 139 | } |
| 140 | if (n == 0) { |
| 141 | if (reading) { |
| 142 | return IOS_EOF; /* EOF is -1 in javaland */ |
| 143 | } else { |
| 144 | return 0; |
| 145 | } |
| 146 | } |
| 147 | JNU_ThrowIOExceptionWithLastError(env, "Read/write failed"); |
| 148 | return IOS_THROWN; |
| 149 | } |
| 150 | |
| 151 | /* Declared in nio_util.h for use elsewhere in NIO */ |
| 152 | |
| 153 | jlong |
| 154 | convertLongReturnVal(JNIEnv *env, jlong n, jboolean reading) |
| 155 | { |
| 156 | if (n > 0) /* Number of bytes written */ |
| 157 | return n; |
| 158 | if (n < 0) { |
| 159 | if (errno == EAGAIN) |
| 160 | return IOS_UNAVAILABLE; |
| 161 | if (errno == EINTR) |
| 162 | return IOS_INTERRUPTED; |
| 163 | } |
| 164 | if (n == 0) { |
| 165 | if (reading) { |
| 166 | return IOS_EOF; /* EOF is -1 in javaland */ |
| 167 | } else { |
| 168 | return 0; |
| 169 | } |
| 170 | } |
| 171 | JNU_ThrowIOExceptionWithLastError(env, "Read/write failed"); |
| 172 | return IOS_THROWN; |
| 173 | } |
| 174 | |
| 175 | jint |
| 176 | fdval(JNIEnv *env, jobject fdo) |
| 177 | { |
| 178 | return (*env)->GetIntField(env, fdo, fd_fdID); |
| 179 | } |