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Copy pathSocketOutputStream.c
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163 lines (151 loc) · 5.83 KB
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/*
* Copyright (c) 1997, 2016, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
#include <malloc.h>
#include "net_util.h"
#include "java_net_SocketOutputStream.h"
/************************************************************************
* SocketOutputStream
*/
static jfieldID IO_fd_fdID;
/*
* Class: java_net_SocketOutputStream
* Method: init
* Signature: ()V
*/
JNIEXPORT void JNICALL
Java_java_net_SocketOutputStream_init(JNIEnv *env, jclass cls) {
IO_fd_fdID = NET_GetFileDescriptorID(env);
}
/*
* Class: java_net_SocketOutputStream
* Method: socketWrite
* Signature: (Ljava/io/FileDescriptor;[BII)V
*/
JNIEXPORT void JNICALL
Java_java_net_SocketOutputStream_socketWrite0(JNIEnv *env, jobject this,
jobject fdObj, jbyteArray data,
jint off, jint len) {
char *bufP;
char BUF[MAX_BUFFER_LEN];
int buflen;
int fd;
if (IS_NULL(fdObj)) {
JNU_ThrowByName(env, JNU_JAVANETPKG "SocketException", "Socket closed");
return;
} else {
fd = (*env)->GetIntField(env, fdObj, IO_fd_fdID);
}
if (IS_NULL(data)) {
JNU_ThrowNullPointerException(env, "data argument");
return;
}
/*
* Use stack allocate buffer if possible. For large sizes we allocate
* an intermediate buffer from the heap (up to a maximum). If heap is
* unavailable just use our stack buffer.
*/
if (len <= MAX_BUFFER_LEN) {
bufP = BUF;
buflen = MAX_BUFFER_LEN;
} else {
buflen = min(MAX_HEAP_BUFFER_LEN, len);
bufP = (char *)malloc((size_t)buflen);
if (bufP == NULL) {
bufP = BUF;
buflen = MAX_BUFFER_LEN;
}
}
while(len > 0) {
int loff = 0;
int chunkLen = min(buflen, len);
int llen = chunkLen;
int retry = 0;
(*env)->GetByteArrayRegion(env, data, off, chunkLen, (jbyte *)bufP);
if ((*env)->ExceptionCheck(env)) {
break;
} else {
while(llen > 0) {
int n = send(fd, bufP + loff, llen, 0);
if (n > 0) {
llen -= n;
loff += n;
continue;
}
/*
* Due to a bug in Windows Sockets (observed on NT and Windows
* 2000) it may be necessary to retry the send. The issue is that
* on blocking sockets send/WSASend is supposed to block if there
* is insufficient buffer space available. If there are a large
* number of threads blocked on write due to congestion then it's
* possile to hit the NT/2000 bug whereby send returns WSAENOBUFS.
* The workaround we use is to retry the send. If we have a
* large buffer to send (>2k) then we retry with a maximum of
* 2k buffer. If we hit the issue with <=2k buffer then we backoff
* for 1 second and retry again. We repeat this up to a reasonable
* limit before bailing out and throwing an exception. In load
* conditions we've observed that the send will succeed after 2-3
* attempts but this depends on network buffers associated with
* other sockets draining.
*/
if (WSAGetLastError() == WSAENOBUFS) {
if (llen > MAX_BUFFER_LEN) {
buflen = MAX_BUFFER_LEN;
chunkLen = MAX_BUFFER_LEN;
llen = MAX_BUFFER_LEN;
continue;
}
if (retry >= 30) {
JNU_ThrowByName(env, JNU_JAVANETPKG "SocketException",
"No buffer space available - exhausted attempts to queue buffer");
if (bufP != BUF) {
free(bufP);
}
return;
}
Sleep(1000);
retry++;
continue;
}
/*
* Send failed - can be caused by close or write error.
*/
if (WSAGetLastError() == WSAENOTSOCK) {
JNU_ThrowByName(env, JNU_JAVANETPKG "SocketException", "Socket closed");
} else {
NET_ThrowCurrent(env, "socket write error");
}
if (bufP != BUF) {
free(bufP);
}
return;
}
len -= chunkLen;
off += chunkLen;
}
}
if (bufP != BUF) {
free(bufP);
}
}