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| JNIEXPORT jint JNICALL
Java_java_net_SocketInputStream_socketRead0(JNIEnv *env, jobject this,
jobject fdObj, jbyteArray data,
jint off, jint len, jint timeout)
{
char *bufP;
char BUF[MAX_BUFFER_LEN];
jint fd, newfd;
jint nread;
if (IS_NULL(fdObj)) {
JNU_ThrowByName(env, JNU_JAVANETPKG "SocketException", "socket closed");
return -1;
}
fd = (*env)->GetIntField(env, fdObj, IO_fd_fdID);
if (fd == -1) {
NET_ThrowSocketException(env, "Socket closed");
return -1;
}
/*
* If the caller buffer is large than our stack buffer then we allocate
* from the heap (up to a limit). If memory is exhausted we always use
* the stack buffer.
*/
if (len <= MAX_BUFFER_LEN) {
bufP = BUF;
} else {
if (len > MAX_HEAP_BUFFER_LEN) {
len = MAX_HEAP_BUFFER_LEN;
}
bufP = (char *)malloc((size_t)len);
if (bufP == NULL) {
/* allocation failed so use stack buffer */
bufP = BUF;
len = MAX_BUFFER_LEN;
}
}
if (timeout) {
if (timeout <= 5000 || !isRcvTimeoutSupported) {
int ret = NET_Timeout (fd, timeout);
if (ret <= 0) {
if (ret == 0) {
JNU_ThrowByName(env, JNU_JAVANETPKG "SocketTimeoutException",
"Read timed out");
} else if (ret == JVM_IO_ERR) {
JNU_ThrowByName(env, JNU_JAVANETPKG "SocketException", "socket closed");
} else if (ret == JVM_IO_INTR) {
JNU_ThrowByName(env, JNU_JAVAIOPKG "InterruptedIOException",
"Operation interrupted");
}
if (bufP != BUF) {
free(bufP);
}
return -1;
}
/*check if the socket has been closed while we were in timeout*/
newfd = (*env)->GetIntField(env, fdObj, IO_fd_fdID);
if (newfd == -1) {
NET_ThrowSocketException(env, "Socket Closed");
return -1;
}
}
}
nread = recv(fd, bufP, len, 0);
if (nread > 0) {
(*env)->SetByteArrayRegion(env, data, off, nread, (jbyte *)bufP);
} else {
if (nread < 0) {
/*
* Recv failed.
*/
switch (WSAGetLastError()) {
case WSAEINTR:
JNU_ThrowByName(env, JNU_JAVANETPKG "SocketException",
"socket closed");
break;
case WSAECONNRESET:
case WSAESHUTDOWN:
/*
* Connection has been reset - Windows sometimes reports
* the reset as a shutdown error.
*/
JNU_ThrowByName(env, "sun/net/ConnectionResetException",
"");
break;
case WSAETIMEDOUT :
JNU_ThrowByName(env, JNU_JAVANETPKG "SocketTimeoutException",
"Read timed out");
break;
default:
NET_ThrowCurrent(env, "recv failed");
}
}
}
if (bufP != BUF) {
free(bufP);
}
return nread;
} |
