C++ sd_event_default函数代码示例

Manager *manager_new(void) {
        Manager *m;
        int r;

        m = new0(Manager, 1);
        if (!m)
                return NULL;

        m->machines = hashmap_new(&string_hash_ops);
        m->machine_units = hashmap_new(&string_hash_ops);
        m->machine_leaders = hashmap_new(NULL);

        if (!m->machines || !m->machine_units || !m->machine_leaders) {
                manager_free(m);
                return NULL;
        }

        r = sd_event_default(&m->event);
        if (r < 0) {
                manager_free(m);
                return NULL;
        }

        sd_event_set_watchdog(m->event, true);

        return m;
}

static int manager_new(Manager **ret) {
        _cleanup_(manager_unrefp) Manager *m = NULL;
        int r;

        assert(ret);

        m = new0(Manager, 1);
        if (!m)
                return -ENOMEM;

        m->machines = hashmap_new(&string_hash_ops);
        m->machine_units = hashmap_new(&string_hash_ops);
        m->machine_leaders = hashmap_new(NULL);

        if (!m->machines || !m->machine_units || !m->machine_leaders)
                return -ENOMEM;

        r = sd_event_default(&m->event);
        if (r < 0)
                return r;

        r = sd_event_add_signal(m->event, NULL, SIGINT, NULL, NULL);
        if (r < 0)
                return r;

        r = sd_event_add_signal(m->event, NULL, SIGTERM, NULL, NULL);
        if (r < 0)
                return r;

        (void) sd_event_set_watchdog(m->event, true);

        *ret = TAKE_PTR(m);
        return 0;
}

int raw_export_new(
                RawExport **ret,
                sd_event *event,
                RawExportFinished on_finished,
                void *userdata) {

        _cleanup_(raw_export_unrefp) RawExport *e = NULL;
        int r;

        assert(ret);

        e = new0(RawExport, 1);
        if (!e)
                return -ENOMEM;

        e->output_fd = e->input_fd = -1;
        e->on_finished = on_finished;
        e->userdata = userdata;

        RATELIMIT_INIT(e->progress_rate_limit, 100 * USEC_PER_MSEC, 1);
        e->last_percent = (unsigned) -1;

        if (event)
                e->event = sd_event_ref(event);
        else {
                r = sd_event_default(&e->event);
                if (r < 0)
                        return r;
        }

        *ret = TAKE_PTR(e);

        return 0;
}

static int
event_attach_mainloop(void)
{
    int r;
    sd_event *e = NULL;

    if (_ctx.mainloop_source)
        return 0;

    r = sd_event_default(&e);
    if (r < 0)
        return r;

    _ctx.mainloop_source = event_create_source(e);
    if (!_ctx.mainloop_source)
        goto fail;

    sd_event_add_defer(e, &_ctx.ping, _event_mainloop_running, &_ctx);

    return 0;

fail:
    sd_event_unref(e);

    return -ENOMEM;
}

static struct rtsp *start_test_client(void)
{
	int r, fds[2] = { };

	r = sd_event_default(&event);
	ck_assert_int_ge(r, 0);

	r = socketpair(AF_UNIX, SOCK_STREAM, 0, fds);
	ck_assert_int_ge(r, 0);
	ck_assert_int_ge(fds[0], 0);
	ck_assert_int_ge(fds[1], 0);

	r = rtsp_open(&server, fds[0]);
	ck_assert_int_ge(r, 0);

	r = rtsp_attach_event(server, event, 0);
	ck_assert_int_ge(r, 0);

	r = rtsp_open(&client, fds[1]);
	ck_assert_int_ge(r, 0);

	r = rtsp_attach_event(client, event, 0);
	ck_assert_int_ge(r, 0);

	return client;
}

Manager *manager_new(void) {
    Manager *m;
    int r;

    m = new0(Manager, 1);
    if (!m)
        return NULL;

    m->machines = hashmap_new(string_hash_func, string_compare_func);
    m->machine_units = hashmap_new(string_hash_func, string_compare_func);
    m->machine_leaders = hashmap_new(trivial_hash_func, trivial_compare_func);

    if (!m->machines || !m->machine_units || !m->machine_leaders) {
        manager_free(m);
        return NULL;
    }

    r = sd_event_default(&m->event);
    if (r < 0) {
        manager_free(m);
        return NULL;
    }

    return m;
}

void DbusApiInit(int sock)
{
	fd = sock;
	sd_event_source *busSource = NULL;
	sd_bus_slot *slot = NULL;

	int ret = sd_event_default(&event);
	char tmp = '0';
	read(fd, &tmp, sizeof(char));

	ret = sd_bus_open_system(&bus);

	ret = sd_bus_add_object_vtable(bus, &slot, "/org/watchdogd1",
				"org.watchdogd1", watchdogPmon, NULL);

	ret = sd_bus_request_name(bus, "org.watchdogd1", 0);

	if (ret < 0) {
		ReloadDbusDaemon();
		ret = sd_bus_request_name(bus, "org.watchdogd1", 0);
	}

	sd_event_add_io(event, &busSource, sd_bus_get_fd(bus), EPOLLIN, BusHandler, NULL);

	sd_event_loop(event);
}

static void test_pty(void) {
        pid_t pid;
        Pty *pty;

        rcvsiz = 0;
        zero(rcvbuf);

        assert_se(sd_event_default(&event) >= 0);

        pid = pty_fork(&pty, event, pty_fn, NULL, 80, 25);
        assert_se(pid >= 0);

        if (pid == 0) {
                /* child */
                run_child(pty);
                exit(0);
        }

        /* parent */
        run_parent(pty);

        /* Make sure the PTY recycled the child; yeah, this is racy if the
         * PID was already reused; but that seems fine for a test. */
        assert_se(waitpid(pid, NULL, WNOHANG) < 0 && errno == ECHILD);

        pty_unref(pty);
        sd_event_unref(event);
}

int main(int argc, char *argv[]) {
        Context context = {};
        int r, n, fd;

        log_parse_environment();
        log_open();

        r = parse_argv(argc, argv);
        if (r <= 0)
                goto finish;

        r = sd_event_default(&context.event);
        if (r < 0) {
                log_error_errno(r, "Failed to allocate event loop: %m");
                goto finish;
        }

        r = sd_resolve_default(&context.resolve);
        if (r < 0) {
                log_error_errno(r, "Failed to allocate resolver: %m");
                goto finish;
        }

        r = sd_resolve_attach_event(context.resolve, context.event, 0);
        if (r < 0) {
                log_error_errno(r, "Failed to attach resolver: %m");
                goto finish;
        }

        sd_event_set_watchdog(context.event, true);

        n = sd_listen_fds(1);
        if (n < 0) {
                log_error("Failed to receive sockets from parent.");
                r = n;
                goto finish;
        } else if (n == 0) {
                log_error("Didn't get any sockets passed in.");
                r = -EINVAL;
                goto finish;
        }

        for (fd = SD_LISTEN_FDS_START; fd < SD_LISTEN_FDS_START + n; fd++) {
                r = add_listen_socket(&context, fd);
                if (r < 0)
                        goto finish;
        }

        r = sd_event_loop(context.event);
        if (r < 0) {
                log_error_errno(r, "Failed to run event loop: %m");
                goto finish;
        }

finish:
        context_free(&context);

        return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS;
}

int dkr_pull_new(
                DkrPull **ret,
                sd_event *event,
                const char *index_url,
                const char *image_root,
                DkrPullFinished on_finished,
                void *userdata) {

        _cleanup_(dkr_pull_unrefp) DkrPull *i = NULL;
        char *e;
        int r;

        assert(ret);
        assert(index_url);

        if (!http_url_is_valid(index_url))
                return -EINVAL;

        i = new0(DkrPull, 1);
        if (!i)
                return -ENOMEM;

        i->on_finished = on_finished;
        i->userdata = userdata;

        i->image_root = strdup(image_root ?: "/var/lib/machines");
        if (!i->image_root)
                return -ENOMEM;

        i->grow_machine_directory = path_startswith(i->image_root, "/var/lib/machines");

        i->index_url = strdup(index_url);
        if (!i->index_url)
                return -ENOMEM;

        e = endswith(i->index_url, "/");
        if (e)
                *e = 0;

        if (event)
                i->event = sd_event_ref(event);
        else {
                r = sd_event_default(&i->event);
                if (r < 0)
                        return r;
        }

        r = curl_glue_new(&i->glue, i->event);
        if (r < 0)
                return r;

        i->glue->on_finished = pull_job_curl_on_finished;
        i->glue->userdata = i;

        *ret = i;
        i = NULL;

        return 0;
}

int manager_new(Manager **ret) {
        _cleanup_manager_free_ Manager *m = NULL;
        int r;

        m = new0(Manager, 1);
        if (!m)
                return -ENOMEM;

        r = sd_event_default(&m->event);
        if (r < 0)
                return r;

        sd_event_set_watchdog(m->event, true);

        r = sd_rtnl_open(&m->rtnl, RTMGRP_LINK | RTMGRP_IPV4_IFADDR);
        if (r < 0)
                return r;

        r = sd_bus_default_system(&m->bus);
        if (r < 0 && r != -ENOENT) /* TODO: drop when we can rely on kdbus */
                return r;

        r = setup_signals(m);
        if (r < 0)
                return r;

        m->udev = udev_new();
        if (!m->udev)
                return -ENOMEM;

        /* udev does not initialize devices inside containers,
         * so we rely on them being already initialized before
         * entering the container */
        if (detect_container(NULL) > 0) {
                m->udev_monitor = udev_monitor_new_from_netlink(m->udev, "kernel");
                if (!m->udev_monitor)
                        return -ENOMEM;
        } else {
                m->udev_monitor = udev_monitor_new_from_netlink(m->udev, "udev");
                if (!m->udev_monitor)
                        return -ENOMEM;
        }

        m->links = hashmap_new(uint64_hash_func, uint64_compare_func);
        if (!m->links)
                return -ENOMEM;

        m->netdevs = hashmap_new(string_hash_func, string_compare_func);
        if (!m->netdevs)
                return -ENOMEM;

        LIST_HEAD_INIT(m->networks);

        *ret = m;
        m = NULL;

        return 0;
}

int main(int argc, char *argv[]) {
        _cleanup_(sd_event_unrefp) sd_event *event = NULL;
        _cleanup_(sd_bus_track_unrefp) sd_bus_track *x = NULL, *y = NULL;
        _cleanup_(sd_bus_unrefp) sd_bus *a = NULL, *b = NULL;
        const char *unique;
        int r;

        r = sd_event_default(&event);
        assert_se(r >= 0);

        r = sd_bus_open_system(&a);
        if (IN_SET(r, -ECONNREFUSED, -ENOENT)) {
                log_info("Failed to connect to bus, skipping tests.");
                return EXIT_TEST_SKIP;
        }
        assert_se(r >= 0);

        r = sd_bus_attach_event(a, event, SD_EVENT_PRIORITY_NORMAL);
        assert_se(r >= 0);

        r = sd_bus_open_system(&b);
        assert_se(r >= 0);

        r = sd_bus_attach_event(b, event, SD_EVENT_PRIORITY_NORMAL);
        assert_se(r >= 0);

        /* Watch b's name from a */
        r = sd_bus_track_new(a, &x, track_cb_x, NULL);
        assert_se(r >= 0);

        r = sd_bus_get_unique_name(b, &unique);
        assert_se(r >= 0);

        r = sd_bus_track_add_name(x, unique);
        assert_se(r >= 0);

        /* Watch's a's own name from a */
        r = sd_bus_track_new(a, &y, track_cb_y, NULL);
        assert_se(r >= 0);

        r = sd_bus_get_unique_name(a, &unique);
        assert_se(r >= 0);

        r = sd_bus_track_add_name(y, unique);
        assert_se(r >= 0);

        /* Now make b's name disappear */
        sd_bus_close(b);

        r = sd_event_loop(event);
        assert_se(r >= 0);

        assert_se(track_cb_called_x);
        assert_se(track_cb_called_y);

        return 0;
}

int device_wait_for_initialization(sd_device *device, const char *subsystem, sd_device **ret) {
        _cleanup_(sd_device_monitor_unrefp) sd_device_monitor *monitor = NULL;
        _cleanup_(sd_event_unrefp) sd_event *event = NULL;
        struct DeviceMonitorData data = {};
        int r;

        assert(device);
        assert(subsystem);

        if (sd_device_get_is_initialized(device) > 0) {
                if (ret)
                        *ret = sd_device_ref(device);
                return 0;
        }

        assert_se(sd_device_get_sysname(device, &data.sysname) >= 0);

        /* Wait until the device is initialized, so that we can get access to the ID_PATH property */

        r = sd_event_default(&event);
        if (r < 0)
                return log_error_errno(r, "Failed to get default event: %m");

        r = sd_device_monitor_new(&monitor);
        if (r < 0)
                return log_error_errno(r, "Failed to acquire monitor: %m");

        r = sd_device_monitor_filter_add_match_subsystem_devtype(monitor, subsystem, NULL);
        if (r < 0)
                return log_error_errno(r, "Failed to add %s subsystem match to monitor: %m", subsystem);

        r = sd_device_monitor_attach_event(monitor, event);
        if (r < 0)
                return log_error_errno(r, "Failed to attach event to device monitor: %m");

        r = sd_device_monitor_start(monitor, device_monitor_handler, &data);
        if (r < 0)
                return log_error_errno(r, "Failed to start device monitor: %m");

        /* Check again, maybe things changed. Udev will re-read the db if the device wasn't initialized
         * yet. */
        if (sd_device_get_is_initialized(device) > 0) {
                if (ret)
                        *ret = sd_device_ref(device);
                return 0;
        }

        r = sd_event_loop(event);
        if (r < 0)
                return log_error_errno(r, "Event loop failed: %m");

        if (ret)
                *ret = TAKE_PTR(data.device);
        return 0;
}

int manager_new(Manager **ret) {
        _cleanup_manager_free_ Manager *m = NULL;
        int r;

        m = new0(Manager, 1);
        if (!m)
                return -ENOMEM;

        r = sd_event_default(&m->event);
        if (r < 0)
                return r;

        sd_event_set_watchdog(m->event, true);

        r = sd_rtnl_open(RTMGRP_LINK | RTMGRP_IPV4_IFADDR, &m->rtnl);
        if (r < 0)
                return r;

        m->udev = udev_new();
        if (!m->udev)
                return -ENOMEM;

        m->udev_monitor = udev_monitor_new_from_netlink(m->udev, "udev");
        if (!m->udev_monitor)
                return -ENOMEM;

        m->links = hashmap_new(uint64_hash_func, uint64_compare_func);
        if (!m->links)
                return -ENOMEM;

        m->bridges = hashmap_new(string_hash_func, string_compare_func);
        if (!m->bridges)
                return -ENOMEM;

        LIST_HEAD_INIT(m->networks);

        m->network_dirs = strv_new("/etc/systemd/network/",
                        "/run/systemd/network/",
                        "/usr/lib/systemd/network",
#ifdef HAVE_SPLIT_USER
                        "/lib/systemd/network",
#endif
                        NULL);
        if (!m->network_dirs)
                return -ENOMEM;

        if (!path_strv_canonicalize_uniq(m->network_dirs))
                return -ENOMEM;

        *ret = m;
        m = NULL;

        return 0;
}

int main(int argc, char *argv[]) {
        Context context = {};
        _cleanup_event_unref_ sd_event *event = NULL;
        _cleanup_bus_close_unref_ sd_bus *bus = NULL;
        int r;

        log_set_target(LOG_TARGET_AUTO);
        log_parse_environment();
        log_open();

        umask(0022);
        mac_selinux_init("/etc");

        if (argc != 1) {
                log_error("This program takes no arguments.");
                r = -EINVAL;
                goto finish;
        }

        if (argc != 1) {
                log_error("This program takes no arguments.");
                r = -EINVAL;
                goto finish;
        }

        r = sd_event_default(&event);
        if (r < 0) {
                log_error_errno(r, "Failed to allocate event loop: %m");
                goto finish;
        }

        sd_event_set_watchdog(event, true);

        r = connect_bus(&context, event, &bus);
        if (r < 0)
                goto finish;

        r = context_read_data(&context);
        if (r < 0) {
                log_error_errno(r, "Failed to read hostname and machine information: %m");
                goto finish;
        }

        r = bus_event_loop_with_idle(event, bus, "org.freedesktop.hostname1", DEFAULT_EXIT_USEC, NULL, NULL);
        if (r < 0) {
                log_error_errno(r, "Failed to run event loop: %m");
                goto finish;
        }

finish:
        context_free(&context);

        return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS;
}