io: add a QIOChannelNull equivalent to /dev/null
This is for code which needs a portable equivalent to a QIOChannelFile
connected to /dev/null.
Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
Reviewed-by: Juan Quintela <quintela@redhat.com>
Signed-off-by: Juan Quintela <quintela@redhat.com>
Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
diff --git a/tests/unit/test-io-channel-null.c b/tests/unit/test-io-channel-null.c
new file mode 100644
index 0000000..b3aab17
--- /dev/null
+++ b/tests/unit/test-io-channel-null.c
@@ -0,0 +1,95 @@
+/*
+ * QEMU I/O channel null test
+ *
+ * Copyright (c) 2022 Red Hat, Inc.
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library 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
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+#include "qemu/osdep.h"
+#include "io/channel-null.h"
+#include "qapi/error.h"
+
+static gboolean test_io_channel_watch(QIOChannel *ioc,
+ GIOCondition condition,
+ gpointer opaque)
+{
+ GIOCondition *gotcond = opaque;
+ *gotcond = condition;
+ return G_SOURCE_REMOVE;
+}
+
+static void test_io_channel_null_io(void)
+{
+ g_autoptr(QIOChannelNull) null = qio_channel_null_new();
+ char buf[1024];
+ GIOCondition gotcond = 0;
+ Error *local_err = NULL;
+
+ g_assert(qio_channel_write(QIO_CHANNEL(null),
+ "Hello World", 11,
+ &error_abort) == 11);
+
+ g_assert(qio_channel_read(QIO_CHANNEL(null),
+ buf, sizeof(buf),
+ &error_abort) == 0);
+
+ qio_channel_add_watch(QIO_CHANNEL(null),
+ G_IO_IN,
+ test_io_channel_watch,
+ &gotcond,
+ NULL);
+
+ g_main_context_iteration(NULL, false);
+
+ g_assert(gotcond == G_IO_IN);
+
+ qio_channel_add_watch(QIO_CHANNEL(null),
+ G_IO_IN | G_IO_OUT,
+ test_io_channel_watch,
+ &gotcond,
+ NULL);
+
+ g_main_context_iteration(NULL, false);
+
+ g_assert(gotcond == (G_IO_IN | G_IO_OUT));
+
+ qio_channel_close(QIO_CHANNEL(null), &error_abort);
+
+ g_assert(qio_channel_write(QIO_CHANNEL(null),
+ "Hello World", 11,
+ &local_err) == -1);
+ g_assert_nonnull(local_err);
+
+ g_clear_pointer(&local_err, error_free);
+
+ g_assert(qio_channel_read(QIO_CHANNEL(null),
+ buf, sizeof(buf),
+ &local_err) == -1);
+ g_assert_nonnull(local_err);
+
+ g_clear_pointer(&local_err, error_free);
+}
+
+int main(int argc, char **argv)
+{
+ module_call_init(MODULE_INIT_QOM);
+
+ g_test_init(&argc, &argv, NULL);
+
+ g_test_add_func("/io/channel/null/io", test_io_channel_null_io);
+
+ return g_test_run();
+}
