C++ dbus_watch_get_enabled函数代码示例

static void watch_toggled( DBusWatch *p_watch, void *p_data )
{
    intf_thread_t *p_intf = (intf_thread_t*) p_data;

    if( dbus_watch_get_enabled( p_watch ) )
        wakeup_main_loop( p_intf );
}

static dbus_bool_t add_watch(DBusWatch *watch, void *data)
{
	GIOCondition cond = G_IO_HUP | G_IO_ERR;
	DBusConnection *conn = data;
	struct watch_info *info;
	int fd, flags;

	if (!dbus_watch_get_enabled(watch))
		return TRUE;

	info = g_new(struct watch_info, 1);

	fd = dbus_watch_get_unix_fd(watch);
	info->io = g_io_channel_unix_new(fd);
	info->conn = dbus_connection_ref(conn);

	dbus_watch_set_data(watch, info, NULL);

	flags = dbus_watch_get_flags(watch);

	if (flags & DBUS_WATCH_READABLE) cond |= G_IO_IN;
	if (flags & DBUS_WATCH_WRITABLE) cond |= G_IO_OUT;

	info->watch_id = g_io_add_watch(info->io, cond, watch_func, watch);

	return TRUE;
}

static dbus_bool_t virDBusAddWatch(DBusWatch *watch,
                                   void *data)
{
    int flags = 0;
    int fd;
    struct virDBusWatch *info;

    if (VIR_ALLOC(info) < 0)
        return 0;

    if (dbus_watch_get_enabled(watch))
        flags = virDBusTranslateWatchFlags(dbus_watch_get_flags(watch));

# if HAVE_DBUS_WATCH_GET_UNIX_FD
    fd = dbus_watch_get_unix_fd(watch);
# else
    fd = dbus_watch_get_fd(watch);
# endif
    info->bus = (DBusConnection *)data;
    info->watch = virEventAddHandle(fd, flags,
                                    virDBusWatchCallback,
                                    watch, NULL);
    if (info->watch < 0) {
        VIR_FREE(info);
        return 0;
    }
    dbus_watch_set_data(watch, info, virDBusWatchFree);

    return 1;
}

static dbus_bool_t
AddWatch(DBusWatch *aWatch, void *aData)
{
  DBusThread *dbt = (DBusThread *)aData;

  if (dbus_watch_get_enabled(aWatch)) {
    // note that we can't just send the watch and inspect it later
    // because we may get a removeWatch call before this data is reacted
    // to by our eventloop and remove this watch..  reading the add first
    // and then inspecting the recently deceased watch would be bad.
    char control = DBUS_EVENT_LOOP_ADD;
    if (write(dbt->mControlFdW.get(), &control, sizeof(char)) < 0) {
      LOG("Cannot write DBus add watch control data to socket!\n");
      return false;
    }

    int fd = dbus_watch_get_unix_fd(aWatch);
    if (write(dbt->mControlFdW.get(), &fd, sizeof(int)) < 0) {
      LOG("Cannot write DBus add watch descriptor data to socket!\n");
      return false;
    }

    unsigned int flags = dbus_watch_get_flags(aWatch);
    if (write(dbt->mControlFdW.get(), &flags, sizeof(unsigned int)) < 0) {
      LOG("Cannot write DBus add watch flag data to socket!\n");
      return false;
    }

    if (write(dbt->mControlFdW.get(), &aWatch, sizeof(DBusWatch*)) < 0) {
      LOG("Cannot write DBus add watch struct data to socket!\n");
      return false;
    }
  }
  return true;
}

static dbus_bool_t edbus_add_watch(DBusWatch* watch, void* d) {
	E_ASSERT(watch != NULL);

	/* 
	 * check if watch is enabled since dbus_watch_handle() can't be used
	 * on as connection will not be ready to handle this watch yet
	 */
 	if(!dbus_watch_get_enabled(watch))
		return 1;

	EdbusConnImpl* dc = (EdbusConnImpl*)d;
	E_ASSERT(dc != NULL);
	E_ASSERT(dc->watch_list != NULL);

	int fd = dbus_watch_get_fd(watch);
	int flags = dbus_watch_get_flags(watch);

	dc->watch_list->push_back(watch);

	if(flags & DBUS_WATCH_READABLE)
		Fl::add_fd(fd, FL_READ, read_watch_cb, d);

	if(flags & DBUS_WATCH_WRITABLE)
		Fl::add_fd(fd, FL_WRITE, write_watch_cb, d);

	return 1;
}

/**
 * GetPollFds() fills an array of pollfd data structures with :
 *  - the set of enabled dbus watches
 *  - the unix pipe which we use to manually wake up the main loop
 *
 * This function must be called with p_sys->lock locked
 *
 * @return The number of file descriptors
 *
 * @param intf_thread_t *p_intf this interface thread's state
 * @param struct pollfd *p_fds a pointer to a pollfd array large enough to
 * contain all the returned data (number of enabled dbus watches + 1)
 */
static int GetPollFds( intf_thread_t *p_intf, struct pollfd *p_fds )
{
    intf_sys_t *p_sys = p_intf->p_sys;
    int i_fds = 1, i_watches = vlc_array_count( p_sys->p_watches );

    p_fds[0].fd = p_sys->p_pipe_fds[PIPE_OUT];
    p_fds[0].events = POLLIN | POLLPRI;

    for( int i = 0; i < i_watches; i++ )
    {
        DBusWatch *p_watch = NULL;
        p_watch = vlc_array_item_at_index( p_sys->p_watches, i );
        if( !dbus_watch_get_enabled( p_watch ) )
            continue;

        p_fds[i_fds].fd = dbus_watch_get_unix_fd( p_watch );
        int i_flags = dbus_watch_get_flags( p_watch );

        if( i_flags & DBUS_WATCH_READABLE )
            p_fds[i_fds].events |= POLLIN | POLLPRI;

        if( i_flags & DBUS_WATCH_WRITABLE )
            p_fds[i_fds].events |= POLLOUT;

        i_fds++;
    }

    return i_fds;
}

static dbus_bool_t add_watch(DBusWatch *w, void *data)
{
    	if (!dbus_watch_get_enabled(w))
      		return TRUE;

	ASDBusFd *fd = safecalloc (1, sizeof(ASDBusFd));
	fd->fd =  dbus_watch_get_unix_fd(w);
	unsigned int flags = dbus_watch_get_flags(w);
	if (get_flags(flags, DBUS_WATCH_READABLE))
		fd->readable = True;
    /*short cond = EV_PERSIST;
    if (flags & DBUS_WATCH_READABLE)
        cond |= EV_READ;
    if (flags & DBUS_WATCH_WRITABLE)
        cond |= EV_WRITE; */

      // TODO add to the list of FDs
	dbus_watch_set_data(w, fd, NULL);
	if (ASDBus.watchFds == NULL)
		ASDBus.watchFds = create_asvector (sizeof(ASDBusFd*));

	append_vector(ASDBus.watchFds, &fd, 1);

	show_debug(__FILE__,__FUNCTION__,__LINE__,"added dbus watch fd=%d watch=%p readable =%d\n", fd->fd, w, fd->readable);
	return TRUE;
}

static int
pcmk_dbus_watch_dispatch(gpointer userdata)
{
    bool oom = FALSE;
    DBusWatch *watch = userdata;
    int flags = dbus_watch_get_flags(watch);
    bool enabled = dbus_watch_get_enabled (watch);
    mainloop_io_t *client = dbus_watch_get_data(watch);

    crm_trace("Dispatching client %p: %s", client, dbus_watch_flags_to_string(flags));
    if (enabled && is_set(flags, DBUS_WATCH_READABLE)) {
        oom = !dbus_watch_handle(watch, flags);

    } else if (enabled && is_set(flags, DBUS_WATCH_READABLE)) {
        oom = !dbus_watch_handle(watch, flags);

    } else if(enabled) {
        oom = !dbus_watch_handle(watch, DBUS_WATCH_ERROR);
    }

    if(flags != dbus_watch_get_flags(watch)) {
        flags = dbus_watch_get_flags(watch);
        crm_trace("Dispatched client %p: %s (%d)", client, dbus_watch_flags_to_string(flags), flags);
    }

    if(oom) {
        crm_err("DBus encountered OOM while attempting to dispatch %p (%s)", client, dbus_watch_flags_to_string(flags));
    }
    return 0;
}

//Callbacks implementation
unsigned int DBusHandler::Callbacks::addWatch(DBusWatch* watch, void* data)
{
	if(!data) return 0;
	auto& loop = static_cast<DBusHandler*>(data)->compositor().wlEventLoop();

    unsigned int mask = 0;
    if (dbus_watch_get_enabled(watch))
    {
        unsigned int flags = dbus_watch_get_flags(watch);

        if (flags & DBUS_WATCH_READABLE) mask |= WL_EVENT_READABLE;
        if (flags & DBUS_WATCH_WRITABLE) mask |= WL_EVENT_WRITABLE;
    }

    int fd = dbus_watch_get_unix_fd(watch);
    wl_event_source* source = wl_event_loop_add_fd(&loop, fd, mask, dispatchWatch, watch);

    if (!source)
	{
		ny::sendWarning("failed to add dbus watch wl_event_loop_fd");
		return 0;
	}

    dbus_watch_set_data(watch, source, nullptr);
    return 1;
}

void set_dbus_listeners(int *maxfdp,
			fd_set *rset, fd_set *wset, fd_set *eset)
{
  struct watch *w;
  
  for (w = daemon->watches; w; w = w->next)
    if (dbus_watch_get_enabled(w->watch))
      {
	unsigned int flags = dbus_watch_get_flags(w->watch);
#if (DBUS_MINOR > 0)
	int fd = dbus_watch_get_unix_fd(w->watch);
#else
	int fd = dbus_watch_get_fd(w->watch);
#endif
	
	bump_maxfd(fd, maxfdp);
	
	if (flags & DBUS_WATCH_READABLE)
	  FD_SET(fd, rset);
	
	if (flags & DBUS_WATCH_WRITABLE)
	  FD_SET(fd, wset);
	
	FD_SET(fd, eset);
      }
}

static void read_watch_cb(int fd, void* d) { 
	/* E_DEBUG(E_STRLOC ": read_watch_cb()\n"); */

	EdbusConnImpl* dc = (EdbusConnImpl*)d;
	E_ASSERT(dc != NULL);
	E_ASSERT(dc->watch_list != NULL);

	WatchListIter it = dc->watch_list->begin(), it_end = dc->watch_list->end();
	while(it != it_end) {
		if(dbus_watch_get_fd(*it) == fd && dbus_watch_get_enabled(*it)) {
			if(!dbus_watch_handle(*it, DBUS_WATCH_READABLE))
				E_WARNING(E_STRLOC ": Out of memory\n");
			break;
		}
		++it;
	}

	/*
	 * Check if there are more incomming data and process them. Note that 
	 * dbus_connection_dispatch() call will also remove data from queue. 
	 * This means that (here) timer will not be installed if only one unprocessed
	 * message is in queue; opposite, after installment it will process the rest
	 * of the messages without interrupting read_watch_cb() flow.
	 *
	 * If this is not set (e.g. all data are processed here), we can miss initial
	 * (or later) messages that are sent to us. Also, timer will be triggered faster
	 * as it can (seems that 0.5 as timer value misses some data...).
	 */
	if(dbus_connection_dispatch(dc->conn) == DBUS_DISPATCH_DATA_REMAINS)
		Fl::add_timeout(0.2, dispatch_cb, dc);
}

/* Callback: "dbus_watch_get_enabled() may return a different value than it did before" */
static void toggled_watch(DBusWatch *watch, void* data)
{
    log_debug("%s(watch:%p, data)", __func__, watch);

    watch_app_info_t* app_info = (watch_app_info_t*)dbus_watch_get_data(watch);
    if (dbus_watch_get_enabled(watch))
    {
        if (!app_info->watch_enabled)
        {
            app_info->watch_enabled = true;
            int dbus_flags = dbus_watch_get_flags(watch);
            int glib_flags = 0;
            if (dbus_flags & DBUS_WATCH_READABLE) glib_flags |= G_IO_IN;
            if (dbus_flags & DBUS_WATCH_WRITABLE) glib_flags |= G_IO_OUT;
            log_debug(" adding watch to glib main loop. dbus_flags:%x glib_flags:%x", dbus_flags, glib_flags);
            app_info->event_source_id = g_io_add_watch(app_info->channel, (GIOCondition)glib_flags, handle_dbus_fd, watch);
        }
        /* else: it was already enabled */
    }
    else
    {
        if (app_info->watch_enabled)
        {
            app_info->watch_enabled = false;
            /* does it free the hidden GSource too? */
            log_debug(" removing watch from glib main loop");
            g_source_remove(app_info->event_source_id);
        }
        /* else: it was already disabled */
    }
}

static dbus_bool_t add_watch(DBusWatch *watch, void *data)
{
	struct wpas_dbus_priv *priv = data;
	unsigned int flags;
	int fd;

	if (!dbus_watch_get_enabled(watch))
		return TRUE;

	flags = dbus_watch_get_flags(watch);
	fd = dbus_watch_get_unix_fd(watch);

	eloop_register_sock(fd, EVENT_TYPE_EXCEPTION, process_watch_exception,
			    priv, watch);

	if (flags & DBUS_WATCH_READABLE) {
		eloop_register_sock(fd, EVENT_TYPE_READ, process_watch_read,
				    priv, watch);
	}
	if (flags & DBUS_WATCH_WRITABLE) {
		eloop_register_sock(fd, EVENT_TYPE_WRITE, process_watch_write,
				    priv, watch);
	}

	dbus_watch_set_data(watch, priv, NULL);

	return TRUE;
}

static void connection_setup_add_watch(struct ctrl_iface_dbus_priv *iface,
				       DBusWatch *watch)
{
	unsigned int flags;
	int fd;

	if (!dbus_watch_get_enabled(watch))
		return;

	flags = dbus_watch_get_flags(watch);
	fd = dbus_watch_get_unix_fd(watch);

	eloop_register_sock(fd, EVENT_TYPE_EXCEPTION, process_watch_exception,
			    iface, watch);

	if (flags & DBUS_WATCH_READABLE) {
		eloop_register_sock(fd, EVENT_TYPE_READ, process_watch_read,
				    iface, watch);
	}
	if (flags & DBUS_WATCH_WRITABLE) {
		eloop_register_sock(fd, EVENT_TYPE_WRITE, process_watch_write,
				    iface, watch);
	}

	dbus_watch_set_data(watch, iface, NULL);
}

static dbus_bool_t
add(DBusWatch *watch, void *data)
{
	JoyDBus *self = JOY_DBUS(data);
	if (G_UNLIKELY(!self)) {
		goto exit;
	}
	struct Private *priv = GET_PRIVATE(self);
	if (G_UNLIKELY(!priv->app)) {
		goto exit;
	}
	if (!dbus_watch_get_enabled(watch)) {
		goto exit;
	}
	JoySource *source = joy_source_dbus_new(self, watch);
	if (G_UNLIKELY(!source)) {
		goto exit;
	}
	g_object_ref_sink(source);
	g_hash_table_insert(priv->sources, watch, source);
	guint condition = dbus_watch_get_flags(watch);
	if (condition & DBUS_WATCH_READABLE) {
		joy_source_set_condition(source, G_IO_IN);
	}
	if (condition & DBUS_WATCH_WRITABLE) {
		joy_source_set_condition(source, G_IO_OUT);
	}
	joy_application_add_source(priv->app, source);
exit:
	return TRUE;
}