1 /*
2 * Copyright (c) 2002, 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 /*
27 */
28
29 #include "jni.h"
30 #include "jni_util.h"
31 #include "jvm.h"
32 #include "jlong.h"
33 // Android removed.
34 //
35 #include <unistd.h>
36 #include <sys/types.h>
37 #include <sys/uio.h>
38 #include <sys/socket.h>
39 #include <string.h>
40
41 #include "nio_util.h"
42 #include <limits.h>
43
44 #include "nio.h"
45 #include "JNIHelp.h"
46
47 #define NATIVE_METHOD(className, functionName, signature) \
48 { #functionName, signature, (void*)(Java_sun_nio_ch_ ## className ## _ ## functionName) }
49
50 JNIEXPORT jint JNICALL
Java_sun_nio_ch_DatagramDispatcher_read0(JNIEnv * env,jclass clazz,jobject fdo,jlong address,jint len)51 Java_sun_nio_ch_DatagramDispatcher_read0(JNIEnv *env, jclass clazz,
52 jobject fdo, jlong address, jint len)
53 {
54 jint fd = fdval(env, fdo);
55 void *buf = (void *)jlong_to_ptr(address);
56 int result = recv(fd, buf, len, 0);
57 if (result < 0 && errno == ECONNREFUSED) {
58 JNU_ThrowByName(env, JNU_JAVANETPKG "PortUnreachableException", 0);
59 return -2;
60 }
61 return convertReturnVal(env, result, JNI_TRUE);
62 }
63
64 // Android-changed : Use sysconf for IOV_MAX.
65 static int iov_max = -1;
66
67 JNIEXPORT jlong JNICALL
Java_sun_nio_ch_DatagramDispatcher_readv0(JNIEnv * env,jclass clazz,jobject fdo,jlong address,jint len)68 Java_sun_nio_ch_DatagramDispatcher_readv0(JNIEnv *env, jclass clazz,
69 jobject fdo, jlong address, jint len)
70 {
71 jint fd = fdval(env, fdo);
72 ssize_t result = 0;
73 struct iovec *iov = (struct iovec *)jlong_to_ptr(address);
74 struct msghdr m;
75
76 // Android-changed : Use sysconf for IOV_MAX.
77 if (iov_max == -1) {
78 iov_max = sysconf(_SC_IOV_MAX);
79 }
80 if (len > iov_max) {
81 len = iov_max;
82 }
83
84 // initialize the message
85 memset(&m, 0, sizeof(m));
86 m.msg_iov = iov;
87 m.msg_iovlen = len;
88
89 result = recvmsg(fd, &m, 0);
90 if (result < 0 && errno == ECONNREFUSED) {
91 JNU_ThrowByName(env, JNU_JAVANETPKG "PortUnreachableException", 0);
92 return -2;
93 }
94 return convertLongReturnVal(env, (jlong)result, JNI_TRUE);
95 }
96
97 JNIEXPORT jint JNICALL
Java_sun_nio_ch_DatagramDispatcher_write0(JNIEnv * env,jclass clazz,jobject fdo,jlong address,jint len)98 Java_sun_nio_ch_DatagramDispatcher_write0(JNIEnv *env, jclass clazz,
99 jobject fdo, jlong address, jint len)
100 {
101 jint fd = fdval(env, fdo);
102 void *buf = (void *)jlong_to_ptr(address);
103 int result = send(fd, buf, len, 0);
104 if (result < 0 && errno == ECONNREFUSED) {
105 JNU_ThrowByName(env, JNU_JAVANETPKG "PortUnreachableException", 0);
106 return -2;
107 }
108 return convertReturnVal(env, result, JNI_FALSE);
109 }
110
111 JNIEXPORT jlong JNICALL
Java_sun_nio_ch_DatagramDispatcher_writev0(JNIEnv * env,jclass clazz,jobject fdo,jlong address,jint len)112 Java_sun_nio_ch_DatagramDispatcher_writev0(JNIEnv *env, jclass clazz,
113 jobject fdo, jlong address, jint len)
114 {
115 jint fd = fdval(env, fdo);
116 struct iovec *iov = (struct iovec *)jlong_to_ptr(address);
117 struct msghdr m;
118 ssize_t result = 0;
119
120 // Android-changed : Use sysconf for IOV_MAX.
121 if (iov_max == -1) {
122 iov_max = sysconf(_SC_IOV_MAX);
123 }
124
125 if (len > iov_max) {
126 len = iov_max;
127 }
128
129 // initialize the message
130 memset(&m, 0, sizeof(m));
131 m.msg_iov = iov;
132 m.msg_iovlen = len;
133
134 result = sendmsg(fd, &m, 0);
135 if (result < 0 && errno == ECONNREFUSED) {
136 JNU_ThrowByName(env, JNU_JAVANETPKG "PortUnreachableException", 0);
137 return -2;
138 }
139 return convertLongReturnVal(env, (jlong)result, JNI_FALSE);
140 }
141
142 static JNINativeMethod gMethods[] = {
143 NATIVE_METHOD(DatagramDispatcher, read0, "(Ljava/io/FileDescriptor;JI)I"),
144 NATIVE_METHOD(DatagramDispatcher, readv0, "(Ljava/io/FileDescriptor;JI)J"),
145 NATIVE_METHOD(DatagramDispatcher, write0, "(Ljava/io/FileDescriptor;JI)I"),
146 NATIVE_METHOD(DatagramDispatcher, writev0, "(Ljava/io/FileDescriptor;JI)J"),
147 };
148
register_sun_nio_ch_DatagramDispatcher(JNIEnv * env)149 void register_sun_nio_ch_DatagramDispatcher(JNIEnv* env) {
150 jniRegisterNativeMethods(env, "sun/nio/ch/DatagramDispatcher", gMethods, NELEM(gMethods));
151 }
152