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+/*
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+ * QEMU I/O channels null driver
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+ *
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+ * Copyright (c) 2022 Red Hat, Inc.
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+ *
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+ * This library is free software; you can redistribute it and/or
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+ * modify it under the terms of the GNU Lesser General Public
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+ * License as published by the Free Software Foundation; either
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+ * version 2.1 of the License, or (at your option) any later version.
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+ *
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+ * This library is distributed in the hope that it will be useful,
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+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
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+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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+ * Lesser General Public License for more details.
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+ *
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+ * You should have received a copy of the GNU Lesser General Public
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+ * License along with this library; if not, see <http://www.gnu.org/licenses/>.
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+ *
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+ */
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+
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+#include "qemu/osdep.h"
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+#include "io/channel-null.h"
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+#include "io/channel-watch.h"
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+#include "qapi/error.h"
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+#include "trace.h"
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+#include "qemu/iov.h"
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+
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+typedef struct QIOChannelNullSource QIOChannelNullSource;
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+struct QIOChannelNullSource {
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+ GSource parent;
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+ QIOChannel *ioc;
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+ GIOCondition condition;
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+};
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+
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+
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+QIOChannelNull *
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+qio_channel_null_new(void)
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+{
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+ QIOChannelNull *ioc;
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+
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+ ioc = QIO_CHANNEL_NULL(object_new(TYPE_QIO_CHANNEL_NULL));
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+
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+ trace_qio_channel_null_new(ioc);
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+
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+ return ioc;
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+}
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+
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+
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+static void
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+qio_channel_null_init(Object *obj)
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+{
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+ QIOChannelNull *ioc = QIO_CHANNEL_NULL(obj);
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+ ioc->closed = false;
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+}
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+
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+
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+static ssize_t
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+qio_channel_null_readv(QIOChannel *ioc,
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+ const struct iovec *iov,
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+ size_t niov,
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+ int **fds G_GNUC_UNUSED,
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+ size_t *nfds G_GNUC_UNUSED,
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+ Error **errp)
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+{
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+ QIOChannelNull *nioc = QIO_CHANNEL_NULL(ioc);
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+
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+ if (nioc->closed) {
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+ error_setg_errno(errp, EINVAL,
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+ "Channel is closed");
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+ return -1;
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+ }
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+
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+ return 0;
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+}
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+
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+
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+static ssize_t
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+qio_channel_null_writev(QIOChannel *ioc,
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+ const struct iovec *iov,
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+ size_t niov,
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+ int *fds G_GNUC_UNUSED,
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+ size_t nfds G_GNUC_UNUSED,
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+ int flags G_GNUC_UNUSED,
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+ Error **errp)
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+{
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+ QIOChannelNull *nioc = QIO_CHANNEL_NULL(ioc);
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+
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+ if (nioc->closed) {
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+ error_setg_errno(errp, EINVAL,
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+ "Channel is closed");
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+ return -1;
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+ }
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+
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+ return iov_size(iov, niov);
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+}
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+
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+
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+static int
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+qio_channel_null_set_blocking(QIOChannel *ioc G_GNUC_UNUSED,
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+ bool enabled G_GNUC_UNUSED,
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+ Error **errp G_GNUC_UNUSED)
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+{
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+ return 0;
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+}
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+
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+
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+static off_t
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+qio_channel_null_seek(QIOChannel *ioc G_GNUC_UNUSED,
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+ off_t offset G_GNUC_UNUSED,
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+ int whence G_GNUC_UNUSED,
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+ Error **errp G_GNUC_UNUSED)
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+{
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+ return 0;
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+}
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+
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+
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+static int
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+qio_channel_null_close(QIOChannel *ioc,
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+ Error **errp G_GNUC_UNUSED)
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+{
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+ QIOChannelNull *nioc = QIO_CHANNEL_NULL(ioc);
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+
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+ nioc->closed = true;
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+ return 0;
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+}
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+
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+
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+static void
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+qio_channel_null_set_aio_fd_handler(QIOChannel *ioc G_GNUC_UNUSED,
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+ AioContext *ctx G_GNUC_UNUSED,
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+ IOHandler *io_read G_GNUC_UNUSED,
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+ IOHandler *io_write G_GNUC_UNUSED,
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+ void *opaque G_GNUC_UNUSED)
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+{
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+}
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+
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+
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+static gboolean
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+qio_channel_null_source_prepare(GSource *source G_GNUC_UNUSED,
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+ gint *timeout)
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+{
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+ *timeout = -1;
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+
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+ return TRUE;
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+}
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+
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+
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+static gboolean
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+qio_channel_null_source_check(GSource *source G_GNUC_UNUSED)
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+{
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+ return TRUE;
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+}
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+
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+
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+static gboolean
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+qio_channel_null_source_dispatch(GSource *source,
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+ GSourceFunc callback,
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+ gpointer user_data)
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+{
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+ QIOChannelFunc func = (QIOChannelFunc)callback;
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+ QIOChannelNullSource *ssource = (QIOChannelNullSource *)source;
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+
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+ return (*func)(ssource->ioc,
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+ ssource->condition,
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+ user_data);
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+}
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+
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+
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+static void
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+qio_channel_null_source_finalize(GSource *source)
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+{
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+ QIOChannelNullSource *ssource = (QIOChannelNullSource *)source;
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+
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+ object_unref(OBJECT(ssource->ioc));
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+}
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+
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+
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+GSourceFuncs qio_channel_null_source_funcs = {
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+ qio_channel_null_source_prepare,
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+ qio_channel_null_source_check,
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+ qio_channel_null_source_dispatch,
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+ qio_channel_null_source_finalize
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+};
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+
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+
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+static GSource *
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+qio_channel_null_create_watch(QIOChannel *ioc,
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+ GIOCondition condition)
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+{
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+ GSource *source;
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+ QIOChannelNullSource *ssource;
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+
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+ source = g_source_new(&qio_channel_null_source_funcs,
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+ sizeof(QIOChannelNullSource));
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+ ssource = (QIOChannelNullSource *)source;
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+
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+ ssource->ioc = ioc;
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+ object_ref(OBJECT(ioc));
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+
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+ ssource->condition = condition;
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+
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+ return source;
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+}
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+
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+
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+static void
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+qio_channel_null_class_init(ObjectClass *klass,
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+ void *class_data G_GNUC_UNUSED)
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+{
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+ QIOChannelClass *ioc_klass = QIO_CHANNEL_CLASS(klass);
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+
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+ ioc_klass->io_writev = qio_channel_null_writev;
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+ ioc_klass->io_readv = qio_channel_null_readv;
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+ ioc_klass->io_set_blocking = qio_channel_null_set_blocking;
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+ ioc_klass->io_seek = qio_channel_null_seek;
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+ ioc_klass->io_close = qio_channel_null_close;
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+ ioc_klass->io_create_watch = qio_channel_null_create_watch;
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+ ioc_klass->io_set_aio_fd_handler = qio_channel_null_set_aio_fd_handler;
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+}
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+
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+
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+static const TypeInfo qio_channel_null_info = {
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+ .parent = TYPE_QIO_CHANNEL,
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+ .name = TYPE_QIO_CHANNEL_NULL,
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+ .instance_size = sizeof(QIOChannelNull),
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+ .instance_init = qio_channel_null_init,
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+ .class_init = qio_channel_null_class_init,
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+};
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+
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+
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+static void
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+qio_channel_null_register_types(void)
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+{
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+ type_register_static(&qio_channel_null_info);
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+}
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+
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+type_init(qio_channel_null_register_types);
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