C++ SCOPE函数代码示例

static void scope_realize(GtkWidget *widget)
{
	Scope *scope;
	GdkWindowAttr attributes;
	gint attributes_mask;
	GdkGCValues gc_values;
	GtkAllocation allocation;
	GdkWindow *window;
	GtkStyle *style;

	g_return_if_fail(widget != NULL);
	g_return_if_fail(IS_SCOPE(widget));

	scope = SCOPE(widget);
	gtk_widget_set_realized(widget, TRUE);
	gtk_widget_get_allocation(widget, &allocation);

	attributes.window_type = GDK_WINDOW_CHILD;
	attributes.x = allocation.x;
	attributes.y = allocation.y;
	attributes.width = allocation.width;
	attributes.height = allocation.height;
	attributes.wclass = GDK_INPUT_OUTPUT;
	attributes.visual = gtk_widget_get_visual(widget);
	attributes.colormap = gtk_widget_get_colormap(widget);
	attributes.event_mask = gtk_widget_get_events(widget) | GDK_EXPOSURE_MASK;

	attributes_mask = GDK_WA_X | GDK_WA_Y | GDK_WA_VISUAL | GDK_WA_COLORMAP;

	gtk_widget_set_has_window(widget, TRUE);
	window = gdk_window_new(gtk_widget_get_parent_window(widget), &attributes, attributes_mask);
	gtk_widget_set_window(widget, window);
	gdk_window_set_user_data(window, scope);

	gtk_widget_style_attach(widget);
	style = gtk_widget_get_style(widget);
	gtk_style_set_background(style, window, GTK_STATE_NORMAL);

	/* gc's if necessary */
	if (!gdk_colormap_alloc_color(style->colormap, &scope->tracecol,
				      FALSE, TRUE))
		g_warning("unable to allocate color: ( %d %d %d )",
			  scope->tracecol.red, scope->tracecol.green, scope->tracecol.blue);
	gc_values.foreground = scope->tracecol;
	scope->trace_gc = gtk_gc_get(style->depth, 
				    style->colormap,
				    &gc_values, GDK_GC_FOREGROUND);
	if (!gdk_colormap_alloc_color(style->colormap, &scope->gridcol,
				      FALSE, TRUE))
		g_warning("unable to allocate color: ( %d %d %d )",
			  scope->gridcol.red, scope->gridcol.green, scope->gridcol.blue);
	gc_values.foreground = scope->gridcol;
	scope->grid_gc = gtk_gc_get(style->depth,
				   style->colormap,
				   &gc_values, GDK_GC_FOREGROUND);
	/* create backing store */
	scope->pixmap = gdk_pixmap_new(window, SCOPE_WIDTH, SCOPE_HEIGHT, -1);

	scope_send_configure(SCOPE(widget));
}

static gint idle_callback(gpointer data)
{
	g_return_val_if_fail(data != NULL, FALSE);
	g_return_val_if_fail(IS_SCOPE(data), FALSE);
	SCOPE(data)->idlefunc = 0;
	if (!gtk_widget_is_drawable(GTK_WIDGET(data)))
		return FALSE;
	draw(SCOPE(data));
	return FALSE;  /* don't call this callback again */
}

static int scope_load_init_scope(Unit *u) {
        assert(u);

        if (!unit_has_name(u, SPECIAL_INIT_SCOPE))
                return 0;

        u->transient = true;
        u->perpetual = true;

        /* init.scope is a bit special, as it has to stick around forever. Because of its special semantics we
         * synthesize it here, instead of relying on the unit file on disk. */

        u->default_dependencies = false;
        u->ignore_on_isolate = true;

        SCOPE(u)->kill_context.kill_signal = SIGRTMIN+14;

        /* Prettify things, if we can. */
        if (!u->description)
                u->description = strdup("System and Service Manager");
        if (!u->documentation)
                (void) strv_extend(&u->documentation, "man:systemd(1)");

        return 1;
}

static int scope_load(Unit *u) {
        Scope *s = SCOPE(u);
        int r;

        assert(s);
        assert(u->load_state == UNIT_STUB);

        if (!u->transient && !manager_is_reloading_or_reexecuting(u->manager))
                return -ENOENT;

        u->load_state = UNIT_LOADED;

        r = unit_load_dropin(u);
        if (r < 0)
                return r;

        r = unit_patch_contexts(u);
        if (r < 0)
                return r;

        r = unit_set_default_slice(u);
        if (r < 0)
                return r;

        r = scope_add_default_dependencies(s);
        if (r < 0)
                return r;

        return scope_verify(s);
}

static int scope_start(Unit *u) {
        Scope *s = SCOPE(u);
        int r;

        assert(s);

        if (s->state == SCOPE_FAILED)
                return -EPERM;

        if (s->state == SCOPE_STOP_SIGTERM ||
            s->state == SCOPE_STOP_SIGKILL)
                return -EAGAIN;

        assert(s->state == SCOPE_DEAD);

        if (!u->transient && UNIT(s)->manager->n_reloading <= 0)
                return -ENOENT;

        r = unit_realize_cgroup(u);
        if (r < 0) {
                log_error("Failed to realize cgroup: %s", strerror(-r));
                return r;
        }

        r = cg_attach_many_everywhere(u->manager->cgroup_supported, u->cgroup_path, UNIT(s)->pids);
        if (r < 0)
                return r;

        s->result = SCOPE_SUCCESS;

        scope_set_state(s, SCOPE_RUNNING);
        return 0;
}

static int scope_deserialize_item(Unit *u, const char *key, const char *value, FDSet *fds) {
        Scope *s = SCOPE(u);

        assert(u);
        assert(key);
        assert(value);
        assert(fds);

        if (streq(key, "state")) {
                ScopeState state;

                state = scope_state_from_string(value);
                if (state < 0)
                        log_unit_debug(u, "Failed to parse state value: %s", value);
                else
                        s->deserialized_state = state;

        } else if (streq(key, "was-abandoned")) {
                int k;

                k = parse_boolean(value);
                if (k < 0)
                        log_unit_debug(u, "Failed to parse boolean value: %s", value);
                else
                        s->was_abandoned = k;
        } else
                log_unit_debug(u, "Unknown serialization key: %s", key);

        return 0;
}

static int scope_dispatch_timer(sd_event_source *source, usec_t usec, void *userdata) {
        Scope *s = SCOPE(userdata);

        assert(s);
        assert(s->timer_event_source == source);

        switch (s->state) {

        case SCOPE_STOP_SIGTERM:
                if (s->kill_context.send_sigkill) {
                        log_warning_unit(UNIT(s)->id, "%s stopping timed out. Killing.", UNIT(s)->id);
                        scope_enter_signal(s, SCOPE_STOP_SIGKILL, SCOPE_FAILURE_TIMEOUT);
                } else {
                        log_warning_unit(UNIT(s)->id, "%s stopping timed out. Skipping SIGKILL.", UNIT(s)->id);
                        scope_enter_dead(s, SCOPE_FAILURE_TIMEOUT);
                }

                break;

        case SCOPE_STOP_SIGKILL:
                log_warning_unit(UNIT(s)->id, "%s still around after SIGKILL. Ignoring.", UNIT(s)->id);
                scope_enter_dead(s, SCOPE_FAILURE_TIMEOUT);
                break;

        default:
                assert_not_reached("Timeout at wrong time.");
        }

        return 0;
}

static int scope_start(Unit *u) {
        Scope *s = SCOPE(u);
        int r;

        assert(s);

        if (s->state == SCOPE_FAILED)
                return -EPERM;

        /* We can't fulfill this right now, please try again later */
        if (s->state == SCOPE_STOP_SIGTERM ||
            s->state == SCOPE_STOP_SIGKILL)
                return -EAGAIN;

        assert(s->state == SCOPE_DEAD);

        if (!u->transient && UNIT(s)->manager->n_reloading <= 0)
                return -ENOENT;

        (void) unit_realize_cgroup(u);
        (void) unit_reset_cpu_usage(u);

        r = unit_attach_pids_to_cgroup(u);
        if (r < 0) {
                log_unit_warning_errno(UNIT(s), r, "Failed to add PIDs to scope's control group: %m");
                scope_enter_dead(s, SCOPE_FAILURE_RESOURCES);
                return r;
        }

        s->result = SCOPE_SUCCESS;

        scope_set_state(s, SCOPE_RUNNING);
        return 1;
}

static int scope_load(Unit *u) {
        Scope *s = SCOPE(u);
        int r;

        assert(s);
        assert(u->load_state == UNIT_STUB);

        if (!u->transient && UNIT(s)->manager->n_reloading <= 0)
                return -ENOENT;

        u->load_state = UNIT_LOADED;

        r = unit_load_dropin(u);
        if (r < 0)
                return r;

        r = unit_add_default_slice(u);
        if (r < 0)
                return r;

        if (u->default_dependencies) {
                r = scope_add_default_dependencies(s);
                if (r < 0)
                        return r;
        }

        return scope_verify(s);
}

int bus_scope_set_property(
                Unit *u,
                const char *name,
                sd_bus_message *message,
                UnitSetPropertiesMode mode,
                sd_bus_error *error) {

        Scope *s = SCOPE(u);
        int r;

        assert(s);
        assert(name);
        assert(message);

        r = bus_cgroup_set_property(u, &s->cgroup_context, name, message, mode, error);
        if (r != 0)
                return r;

        if (u->load_state == UNIT_STUB) {
                /* While we are created we still accept PIDs */

                r = bus_scope_set_transient_property(s, name, message, mode, error);
                if (r != 0)
                        return r;

                r = bus_kill_context_set_transient_property(u, &s->kill_context, name, message, mode, error);
                if (r != 0)
                        return r;
        }

        return 0;
}

static int scope_load(Unit *u) {
        Scope *s = SCOPE(u);
        int r;

        assert(s);
        assert(u->load_state == UNIT_STUB);

        if (!u->transient && !MANAGER_IS_RELOADING(u->manager))
                /* Refuse to load non-transient scope units, but allow them while reloading. */
                return -ENOENT;

        r = scope_load_init_scope(u);
        if (r < 0)
                return r;
        r = unit_load_fragment_and_dropin_optional(u);
        if (r < 0)
                return r;

        if (u->load_state == UNIT_LOADED) {
                r = unit_patch_contexts(u);
                if (r < 0)
                        return r;

                r = unit_set_default_slice(u);
                if (r < 0)
                        return r;

                r = scope_add_default_dependencies(s);
                if (r < 0)
                        return r;
        }

        return scope_verify(s);
}

static void scope_enumerate_perpetual(Manager *m) {
        Unit *u;
        int r;

        assert(m);

        /* Let's unconditionally add the "init.scope" special unit
         * that encapsulates PID 1. Note that PID 1 already is in the
         * cgroup for this, we hence just need to allocate the object
         * for it and that's it. */

        u = manager_get_unit(m, SPECIAL_INIT_SCOPE);
        if (!u) {
                r = unit_new_for_name(m, sizeof(Scope), SPECIAL_INIT_SCOPE, &u);
                if (r < 0)  {
                        log_error_errno(r, "Failed to allocate the special " SPECIAL_INIT_SCOPE " unit: %m");
                        return;
                }
        }

        u->transient = true;
        u->perpetual = true;
        SCOPE(u)->deserialized_state = SCOPE_RUNNING;

        unit_add_to_load_queue(u);
        unit_add_to_dbus_queue(u);
}

static void scope_enumerate(Manager *m) {
        Unit *u;
        int r;

        assert(m);

        /* Let's unconditionally add the "init.scope" special unit
         * that encapsulates PID 1. Note that PID 1 already is in the
         * cgroup for this, we hence just need to allocate the object
         * for it and that's it. */

        u = manager_get_unit(m, SPECIAL_INIT_SCOPE);
        if (!u) {
                u = unit_new(m, sizeof(Scope));
                if (!u) {
                        log_oom();
                        return;
                }

                r = unit_add_name(u, SPECIAL_INIT_SCOPE);
                if (r < 0)  {
                        unit_free(u);
                        log_error_errno(r, "Failed to add init.scope name");
                        return;
                }
        }

        u->transient = true;
        u->default_dependencies = false;
        u->no_gc = true;
        u->ignore_on_isolate = true;
        u->refuse_manual_start = true;
        u->refuse_manual_stop = true;
        SCOPE(u)->deserialized_state = SCOPE_RUNNING;
        SCOPE(u)->kill_context.kill_signal = SIGRTMIN+14;

        /* Prettify things, if we can. */
        if (!u->description)
                u->description = strdup("System and Service Manager");
        if (!u->documentation)
                (void) strv_extend(&u->documentation, "man:systemd(1)");

        unit_add_to_load_queue(u);
        unit_add_to_dbus_queue(u);
}

static void scope_notify_cgroup_empty_event(Unit *u) {
        Scope *s = SCOPE(u);
        assert(u);

        log_unit_debug(u, "cgroup is empty");

        if (IN_SET(s->state, SCOPE_RUNNING, SCOPE_ABANDONED, SCOPE_STOP_SIGTERM, SCOPE_STOP_SIGKILL))
                scope_enter_dead(s, SCOPE_SUCCESS);
}

static void scope_init(Unit *u) {
        Scope *s = SCOPE(u);

        assert(u);
        assert(u->load_state == UNIT_STUB);

        s->timeout_stop_usec = u->manager->default_timeout_stop_usec;
        u->ignore_on_isolate = true;
}