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https://gitlab.freedesktop.org/wayland/weston
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![Daniel Stone](/assets/img/avatar_default.png)
Just discard the value, rather than trying to return a value from a void function. Signed-off-by: Daniel Stone <daniels@collabora.com>
409 lines
9.6 KiB
C
409 lines
9.6 KiB
C
/*
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* Copyright © 2013 David Herrmann <dh.herrmann@gmail.com>
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*
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* Permission is hereby granted, free of charge, to any person obtaining
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* a copy of this software and associated documentation files (the
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* "Software"), to deal in the Software without restriction, including
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* without limitation the rights to use, copy, modify, merge, publish,
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* distribute, sublicense, and/or sell copies of the Software, and to
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* permit persons to whom the Software is furnished to do so, subject to
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* the following conditions:
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*
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* The above copyright notice and this permission notice (including the
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* next paragraph) shall be included in all copies or substantial
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* portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
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* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
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* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*/
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/*
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* DBus Helpers
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* This file contains the dbus mainloop integration and several helpers to
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* make lowlevel libdbus access easier.
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*/
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#include "config.h"
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#include <dbus/dbus.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <stdbool.h>
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#include <stdint.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sys/epoll.h>
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#include <sys/eventfd.h>
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#include <sys/timerfd.h>
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#include <unistd.h>
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#include <wayland-server.h>
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#include <libweston/libweston.h>
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#include "dbus.h"
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/*
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* DBus Mainloop Integration
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* weston_dbus_bind() and weston_dbus_unbind() allow to bind an existing
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* DBusConnection to an existing wl_event_loop object. All dbus dispatching
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* is then nicely integrated into the wayland event loop.
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* Note that this only provides basic watch and timeout dispatching. No
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* remote thread wakeup, signal handling or other dbus insanity is supported.
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* This is fine as long as you don't use any of the deprecated libdbus
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* interfaces (like waking up remote threads..). There is really no rational
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* reason to support these.
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*/
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static int weston_dbus_dispatch_watch(int fd, uint32_t mask, void *data)
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{
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DBusWatch *watch = data;
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uint32_t flags = 0;
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if (dbus_watch_get_enabled(watch)) {
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if (mask & WL_EVENT_READABLE)
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flags |= DBUS_WATCH_READABLE;
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if (mask & WL_EVENT_WRITABLE)
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flags |= DBUS_WATCH_WRITABLE;
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if (mask & WL_EVENT_HANGUP)
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flags |= DBUS_WATCH_HANGUP;
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if (mask & WL_EVENT_ERROR)
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flags |= DBUS_WATCH_ERROR;
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dbus_watch_handle(watch, flags);
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}
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return 0;
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}
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static dbus_bool_t weston_dbus_add_watch(DBusWatch *watch, void *data)
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{
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struct wl_event_loop *loop = data;
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struct wl_event_source *s;
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int fd;
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uint32_t mask = 0, flags;
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if (dbus_watch_get_enabled(watch)) {
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flags = dbus_watch_get_flags(watch);
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if (flags & DBUS_WATCH_READABLE)
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mask |= WL_EVENT_READABLE;
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if (flags & DBUS_WATCH_WRITABLE)
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mask |= WL_EVENT_WRITABLE;
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}
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fd = dbus_watch_get_unix_fd(watch);
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s = wl_event_loop_add_fd(loop, fd, mask, weston_dbus_dispatch_watch,
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watch);
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if (!s)
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return FALSE;
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dbus_watch_set_data(watch, s, NULL);
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return TRUE;
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}
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static void weston_dbus_remove_watch(DBusWatch *watch, void *data)
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{
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struct wl_event_source *s;
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s = dbus_watch_get_data(watch);
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if (!s)
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return;
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wl_event_source_remove(s);
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}
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static void weston_dbus_toggle_watch(DBusWatch *watch, void *data)
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{
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struct wl_event_source *s;
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uint32_t mask = 0, flags;
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s = dbus_watch_get_data(watch);
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if (!s)
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return;
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if (dbus_watch_get_enabled(watch)) {
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flags = dbus_watch_get_flags(watch);
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if (flags & DBUS_WATCH_READABLE)
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mask |= WL_EVENT_READABLE;
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if (flags & DBUS_WATCH_WRITABLE)
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mask |= WL_EVENT_WRITABLE;
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}
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wl_event_source_fd_update(s, mask);
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}
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static int weston_dbus_dispatch_timeout(void *data)
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{
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DBusTimeout *timeout = data;
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if (dbus_timeout_get_enabled(timeout))
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dbus_timeout_handle(timeout);
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return 0;
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}
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static int weston_dbus_adjust_timeout(DBusTimeout *timeout,
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struct wl_event_source *s)
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{
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int64_t t = 0;
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if (dbus_timeout_get_enabled(timeout))
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t = dbus_timeout_get_interval(timeout);
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return wl_event_source_timer_update(s, t);
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}
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static dbus_bool_t weston_dbus_add_timeout(DBusTimeout *timeout, void *data)
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{
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struct wl_event_loop *loop = data;
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struct wl_event_source *s;
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int r;
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s = wl_event_loop_add_timer(loop, weston_dbus_dispatch_timeout,
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timeout);
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if (!s)
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return FALSE;
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r = weston_dbus_adjust_timeout(timeout, s);
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if (r < 0) {
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wl_event_source_remove(s);
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return FALSE;
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}
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dbus_timeout_set_data(timeout, s, NULL);
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return TRUE;
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}
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static void weston_dbus_remove_timeout(DBusTimeout *timeout, void *data)
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{
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struct wl_event_source *s;
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s = dbus_timeout_get_data(timeout);
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if (!s)
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return;
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wl_event_source_remove(s);
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}
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static void weston_dbus_toggle_timeout(DBusTimeout *timeout, void *data)
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{
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struct wl_event_source *s;
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s = dbus_timeout_get_data(timeout);
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if (!s)
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return;
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weston_dbus_adjust_timeout(timeout, s);
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}
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static int weston_dbus_dispatch(int fd, uint32_t mask, void *data)
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{
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DBusConnection *c = data;
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int r;
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do {
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r = dbus_connection_dispatch(c);
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if (r == DBUS_DISPATCH_COMPLETE)
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r = 0;
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else if (r == DBUS_DISPATCH_DATA_REMAINS)
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r = -EAGAIN;
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else if (r == DBUS_DISPATCH_NEED_MEMORY)
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r = -ENOMEM;
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else
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r = -EIO;
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} while (r == -EAGAIN);
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if (r)
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weston_log("cannot dispatch dbus events: %d\n", r);
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return 0;
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}
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static int weston_dbus_bind(struct wl_event_loop *loop, DBusConnection *c,
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struct wl_event_source **ctx_out)
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{
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bool b;
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int r, fd;
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/* Idle events cannot reschedule themselves, therefore we use a dummy
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* event-fd and mark it for post-dispatch. Hence, the dbus
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* dispatcher is called after every dispatch-round.
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* This is required as dbus doesn't allow dispatching events from
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* within its own event sources. */
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fd = eventfd(0, EFD_CLOEXEC);
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if (fd < 0)
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return -errno;
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*ctx_out = wl_event_loop_add_fd(loop, fd, 0, weston_dbus_dispatch, c);
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close(fd);
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if (!*ctx_out)
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return -ENOMEM;
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wl_event_source_check(*ctx_out);
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b = dbus_connection_set_watch_functions(c,
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weston_dbus_add_watch,
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weston_dbus_remove_watch,
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weston_dbus_toggle_watch,
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loop,
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NULL);
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if (!b) {
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r = -ENOMEM;
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goto error;
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}
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b = dbus_connection_set_timeout_functions(c,
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weston_dbus_add_timeout,
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weston_dbus_remove_timeout,
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weston_dbus_toggle_timeout,
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loop,
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NULL);
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if (!b) {
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r = -ENOMEM;
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goto error;
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}
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dbus_connection_ref(c);
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return 0;
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error:
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dbus_connection_set_timeout_functions(c, NULL, NULL, NULL,
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NULL, NULL);
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dbus_connection_set_watch_functions(c, NULL, NULL, NULL,
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NULL, NULL);
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wl_event_source_remove(*ctx_out);
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*ctx_out = NULL;
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return r;
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}
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static void weston_dbus_unbind(DBusConnection *c, struct wl_event_source *ctx)
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{
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dbus_connection_set_timeout_functions(c, NULL, NULL, NULL,
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NULL, NULL);
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dbus_connection_set_watch_functions(c, NULL, NULL, NULL,
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NULL, NULL);
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dbus_connection_unref(c);
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wl_event_source_remove(ctx);
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}
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/*
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* Convenience Helpers
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* Several convenience helpers are provided to make using dbus in weston
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* easier. We don't use any of the gdbus or qdbus helpers as they pull in
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* huge dependencies and actually are quite awful to use. Instead, we only
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* use the basic low-level libdbus library.
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*/
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int weston_dbus_open(struct wl_event_loop *loop, DBusBusType bus,
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DBusConnection **out, struct wl_event_source **ctx_out)
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{
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DBusConnection *c;
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int r;
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/* Ihhh, global state.. stupid dbus. */
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dbus_connection_set_change_sigpipe(FALSE);
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/* This is actually synchronous. It blocks for some authentication and
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* setup. We just trust the dbus-server here and accept this blocking
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* call. There is no real reason to complicate things further and make
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* this asynchronous/non-blocking. A context should be created during
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* thead/process/app setup, so blocking calls should be fine. */
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c = dbus_bus_get_private(bus, NULL);
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if (!c)
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return -EIO;
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dbus_connection_set_exit_on_disconnect(c, FALSE);
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r = weston_dbus_bind(loop, c, ctx_out);
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if (r < 0)
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goto error;
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*out = c;
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return r;
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error:
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dbus_connection_close(c);
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dbus_connection_unref(c);
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return r;
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}
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void weston_dbus_close(DBusConnection *c, struct wl_event_source *ctx)
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{
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weston_dbus_unbind(c, ctx);
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dbus_connection_close(c);
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dbus_connection_unref(c);
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}
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int weston_dbus_add_match(DBusConnection *c, const char *format, ...)
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{
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DBusError err;
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int r;
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va_list list;
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char *str;
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va_start(list, format);
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r = vasprintf(&str, format, list);
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va_end(list);
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if (r < 0)
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return -ENOMEM;
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dbus_error_init(&err);
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dbus_bus_add_match(c, str, &err);
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free(str);
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if (dbus_error_is_set(&err)) {
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dbus_error_free(&err);
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return -EIO;
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}
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return 0;
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}
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int weston_dbus_add_match_signal(DBusConnection *c, const char *sender,
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const char *iface, const char *member,
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const char *path)
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{
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return weston_dbus_add_match(c,
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"type='signal',"
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"sender='%s',"
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"interface='%s',"
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"member='%s',"
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"path='%s'",
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sender, iface, member, path);
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}
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void weston_dbus_remove_match(DBusConnection *c, const char *format, ...)
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{
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int r;
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va_list list;
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char *str;
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va_start(list, format);
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r = vasprintf(&str, format, list);
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va_end(list);
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if (r < 0)
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return;
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dbus_bus_remove_match(c, str, NULL);
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free(str);
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}
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void weston_dbus_remove_match_signal(DBusConnection *c, const char *sender,
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const char *iface, const char *member,
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const char *path)
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{
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weston_dbus_remove_match(c,
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"type='signal',"
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"sender='%s',"
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"interface='%s',"
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"member='%s',"
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"path='%s'",
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sender, iface, member, path);
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}
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