jint netty_unix_filedescriptor_JNI_OnLoad(JNIEnv* env, const char* nettyPackagePrefix) {
void* mem = malloc(1);
if (mem == NULL) {
netty_unix_errors_throwOutOfMemoryError(env);
return JNI_ERR;
}
jobject directBuffer = (*env)->NewDirectByteBuffer(env, mem, 1);
if (directBuffer == NULL) {
free(mem);
netty_unix_errors_throwOutOfMemoryError(env);
return JNI_ERR;
}
if ((*env)->GetDirectBufferAddress(env, directBuffer) == NULL) {
free(mem);
netty_unix_errors_throwRuntimeException(env, "failed to get direct buffer address");
return JNI_ERR;
}
jclass cls = (*env)->GetObjectClass(env, directBuffer);
// Get the method id for Buffer.position() and Buffer.limit(). These are used as fallback if
// it is not possible to obtain the position and limit using the fields directly.
posId = (*env)->GetMethodID(env, cls, "position", "()I");
if (posId == NULL) {
free(mem);
// position method was not found.. something is wrong so bail out
netty_unix_errors_throwRuntimeException(env, "failed to get method ID: ByteBuffer.position()");
return JNI_ERR;
}
limitId = (*env)->GetMethodID(env, cls, "limit", "()I");
if (limitId == NULL) {
free(mem);
// limit method was not found.. something is wrong so bail out
netty_unix_errors_throwRuntimeException(env, "failed to get method ID: ByteBuffer.limit()");
return JNI_ERR;
}
// Try to get the ids of the position and limit fields. We later then check if we was able
// to find them and if so use them get the position and limit of the buffer. This is
// much faster then call back into java via (*env)->CallIntMethod(...).
posFieldId = (*env)->GetFieldID(env, cls, "position", "I");
if (posFieldId == NULL) {
// this is ok as we can still use the method so just clear the exception
(*env)->ExceptionClear(env);
}
limitFieldId = (*env)->GetFieldID(env, cls, "limit", "I");
if (limitFieldId == NULL) {
// this is ok as we can still use the method so just clear the exception
(*env)->ExceptionClear(env);
}
free(mem);
}
jint netty_kqueue_bsdsocket_JNI_OnLoad(JNIEnv* env, const char* packagePrefix) {
// Register the methods which are not referenced by static member variables
JNINativeMethod* dynamicMethods = createDynamicMethodsTable(packagePrefix);
if (netty_unix_util_register_natives(env,
packagePrefix,
"io/netty/channel/kqueue/BsdSocket",
dynamicMethods,
dynamicMethodsTableSize()) != 0) {
freeDynamicMethodsTable(dynamicMethods);
return JNI_ERR;
}
freeDynamicMethodsTable(dynamicMethods);
dynamicMethods = NULL;
// Initialize this module
char* nettyClassName = netty_unix_util_prepend(packagePrefix, "io/netty/channel/DefaultFileRegion");
jclass fileRegionCls = (*env)->FindClass(env, nettyClassName);
free(nettyClassName);
nettyClassName = NULL;
if (fileRegionCls == NULL) {
return JNI_ERR;
}
fileChannelFieldId = (*env)->GetFieldID(env, fileRegionCls, "file", "Ljava/nio/channels/FileChannel;");
if (fileChannelFieldId == NULL) {
netty_unix_errors_throwRuntimeException(env, "failed to get field ID: DefaultFileRegion.file");
return JNI_ERR;
}
transferredFieldId = (*env)->GetFieldID(env, fileRegionCls, "transferred", "J");
if (transferredFieldId == NULL) {
netty_unix_errors_throwRuntimeException(env, "failed to get field ID: DefaultFileRegion.transferred");
return JNI_ERR;
}
jclass fileChannelCls = (*env)->FindClass(env, "sun/nio/ch/FileChannelImpl");
if (fileChannelCls == NULL) {
// pending exception...
return JNI_ERR;
}
fileDescriptorFieldId = (*env)->GetFieldID(env, fileChannelCls, "fd", "Ljava/io/FileDescriptor;");
if (fileDescriptorFieldId == NULL) {
netty_unix_errors_throwRuntimeException(env, "failed to get field ID: FileChannelImpl.fd");
return JNI_ERR;
}
jclass fileDescriptorCls = (*env)->FindClass(env, "java/io/FileDescriptor");
if (fileDescriptorCls == NULL) {
// pending exception...
return JNI_ERR;
}
fdFieldId = (*env)->GetFieldID(env, fileDescriptorCls, "fd", "I");
if (fdFieldId == NULL) {
netty_unix_errors_throwRuntimeException(env, "failed to get field ID: FileDescriptor.fd");
return JNI_ERR;
}
stringCls = (*env)->FindClass(env, "java/lang/String");
if (stringCls == NULL) {
// pending exception...
return JNI_ERR;
}
nettyClassName = netty_unix_util_prepend(packagePrefix, "io/netty/channel/unix/PeerCredentials");
jclass localPeerCredsClass = (*env)->FindClass(env, nettyClassName);
free(nettyClassName);
nettyClassName = NULL;
if (localPeerCredsClass == NULL) {
// pending exception...
return JNI_ERR;
}
peerCredentialsClass = (jclass) (*env)->NewGlobalRef(env, localPeerCredsClass);
if (peerCredentialsClass == NULL) {
// out-of-memory!
netty_unix_errors_throwOutOfMemoryError(env);
return JNI_ERR;
}
peerCredentialsMethodId = (*env)->GetMethodID(env, peerCredentialsClass, "<init>", "(II[I)V");
if (peerCredentialsMethodId == NULL) {
netty_unix_errors_throwRuntimeException(env, "failed to get method ID: PeerCredentials.<init>(int, int, int[])");
return JNI_ERR;
}
return NETTY_JNI_VERSION;
}
