qemu/tests/unit/test-fdmon-epoll.c

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/* SPDX-License-Identifier: GPL-2.0-or-later */
/*
* fdmon-epoll tests
*
* Copyright (c) 2020 Red Hat, Inc.
*/
#include "qemu/osdep.h"
#include "block/aio.h"
#include "qapi/error.h"
#include "qemu/main-loop.h"
static AioContext *ctx;
static void dummy_fd_handler(EventNotifier *notifier)
{
event_notifier_test_and_clear(notifier);
}
static void add_event_notifiers(EventNotifier *notifiers, size_t n)
{
for (size_t i = 0; i < n; i++) {
event_notifier_init(&notifiers[i], false);
aio_set_event_notifier(ctx, &notifiers[i], false,
dummy_fd_handler, NULL);
}
}
static void remove_event_notifiers(EventNotifier *notifiers, size_t n)
{
for (size_t i = 0; i < n; i++) {
aio_set_event_notifier(ctx, &notifiers[i], false, NULL, NULL);
event_notifier_cleanup(&notifiers[i]);
}
}
/* Check that fd handlers work when external clients are disabled */
static void test_external_disabled(void)
{
EventNotifier notifiers[100];
/* fdmon-epoll is only enabled when many fd handlers are registered */
add_event_notifiers(notifiers, G_N_ELEMENTS(notifiers));
event_notifier_set(&notifiers[0]);
assert(aio_poll(ctx, true));
aio_disable_external(ctx);
event_notifier_set(&notifiers[0]);
assert(aio_poll(ctx, true));
aio_enable_external(ctx);
remove_event_notifiers(notifiers, G_N_ELEMENTS(notifiers));
}
int main(int argc, char **argv)
{
/*
* This code relies on the fact that fdmon-io_uring disables itself when
* the glib main loop is in use. The main loop uses fdmon-poll and upgrades
* to fdmon-epoll when the number of fds exceeds a threshold.
*/
qemu_init_main_loop(&error_fatal);
ctx = qemu_get_aio_context();
while (g_main_context_iteration(NULL, false)) {
/* Do nothing */
}
g_test_init(&argc, &argv, NULL);
g_test_add_func("/fdmon-epoll/external-disabled", test_external_disabled);
return g_test_run();
}