src/wayland-server.h

/*
 * Copyright © 2008 Kristian Høgsberg
 *
 * Permission to use, copy, modify, distribute, and sell this software and its
 * documentation for any purpose is hereby granted without fee, provided that
 * the above copyright notice appear in all copies and that both that copyright
 * notice and this permission notice appear in supporting documentation, and
 * that the name of the copyright holders not be used in advertising or
 * publicity pertaining to distribution of the software without specific,
 * written prior permission.  The copyright holders make no representations
 * about the suitability of this software for any purpose.  It is provided "as
 * is" without express or implied warranty.
 *
 * THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
 * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
 * EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY SPECIAL, INDIRECT OR
 * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,
 * DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
 * TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
 * OF THIS SOFTWARE.
 */

#ifndef WAYLAND_SERVER_H
#define WAYLAND_SERVER_H

#ifdef  __cplusplus
extern "C" {
#endif

#include <sys/types.h>
#include <stdint.h>
#include "wayland-util.h"
#include "wayland-version.h"

enum {
	WL_EVENT_READABLE = 0x01,
	WL_EVENT_WRITABLE = 0x02,
	WL_EVENT_HANGUP   = 0x04,
	WL_EVENT_ERROR    = 0x08
};

struct wl_event_loop;
struct wl_event_source;
typedef int (*wl_event_loop_fd_func_t)(int fd, uint32_t mask, void *data);
typedef int (*wl_event_loop_timer_func_t)(void *data);
typedef int (*wl_event_loop_signal_func_t)(int signal_number, void *data);
typedef void (*wl_event_loop_idle_func_t)(void *data);

struct wl_event_loop *wl_event_loop_create(void);
void wl_event_loop_destroy(struct wl_event_loop *loop);
struct wl_event_source *wl_event_loop_add_fd(struct wl_event_loop *loop,
					     int fd, uint32_t mask,
					     wl_event_loop_fd_func_t func,
					     void *data);
int wl_event_source_fd_update(struct wl_event_source *source, uint32_t mask);
struct wl_event_source *wl_event_loop_add_timer(struct wl_event_loop *loop,
						wl_event_loop_timer_func_t func,
						void *data);
struct wl_event_source *
wl_event_loop_add_signal(struct wl_event_loop *loop,
			int signal_number,
			wl_event_loop_signal_func_t func,
			void *data);

int wl_event_source_timer_update(struct wl_event_source *source,
				 int ms_delay);
int wl_event_source_remove(struct wl_event_source *source);
void wl_event_source_check(struct wl_event_source *source);


int wl_event_loop_dispatch(struct wl_event_loop *loop, int timeout);
void wl_event_loop_dispatch_idle(struct wl_event_loop *loop);
struct wl_event_source *wl_event_loop_add_idle(struct wl_event_loop *loop,
					       wl_event_loop_idle_func_t func,
					       void *data);
int wl_event_loop_get_fd(struct wl_event_loop *loop);

struct wl_client;
struct wl_display;
struct wl_listener;
struct wl_resource;
struct wl_global;
typedef void (*wl_notify_func_t)(struct wl_listener *listener, void *data);

void wl_event_loop_add_destroy_listener(struct wl_event_loop *loop,
					struct wl_listener * listener);
struct wl_listener *wl_event_loop_get_destroy_listener(
					struct wl_event_loop *loop,
					wl_notify_func_t notify);

struct wl_display *wl_display_create(void);
void wl_display_destroy(struct wl_display *display);
struct wl_event_loop *wl_display_get_event_loop(struct wl_display *display);
int wl_display_add_socket(struct wl_display *display, const char *name);
void wl_display_terminate(struct wl_display *display);
void wl_display_run(struct wl_display *display);
void wl_display_flush_clients(struct wl_display *display);

typedef void (*wl_global_bind_func_t)(struct wl_client *client, void *data,
				      uint32_t version, uint32_t id);

uint32_t wl_display_get_serial(struct wl_display *display);
uint32_t wl_display_next_serial(struct wl_display *display);

void wl_display_add_destroy_listener(struct wl_display *display,
				     struct wl_listener *listener);
struct wl_listener *wl_display_get_destroy_listener(struct wl_display *display,
						    wl_notify_func_t notify);

struct wl_global *wl_global_create(struct wl_display *display,
				   const struct wl_interface *interface,
				   int version,
				   void *data, wl_global_bind_func_t bind);
void wl_global_destroy(struct wl_global *global);

struct wl_client *wl_client_create(struct wl_display *display, int fd);
void wl_client_destroy(struct wl_client *client);
void wl_client_flush(struct wl_client *client);
void wl_client_get_credentials(struct wl_client *client,
			       pid_t *pid, uid_t *uid, gid_t *gid);

void wl_client_add_destroy_listener(struct wl_client *client,
				    struct wl_listener *listener);
struct wl_listener *wl_client_get_destroy_listener(struct wl_client *client,
						   wl_notify_func_t notify);

struct wl_resource *
wl_client_get_object(struct wl_client *client, uint32_t id);
void
wl_client_post_no_memory(struct wl_client *client);

/** \class wl_listener
 *
 * \brief A single listener for Wayland signals
 *
 * wl_listener provides the means to listen for wl_signal notifications. Many
 * Wayland objects use wl_listener for notification of significant events like
 * object destruction.
 *
 * Clients should create wl_listener objects manually and can register them as
 * listeners to signals using #wl_signal_add, assuming the signal is
 * directly accessible. For opaque structs like wl_event_loop, adding a
 * listener should be done through provided accessor methods. A listener can
 * only listen to one signal at a time.
 *
 * ~~~
 * struct wl_listener your_listener;
 *
 * your_listener.notify = your_callback_method;
 *
 * \comment{Direct access}
 * wl_signal_add(&some_object->destroy_signal, &your_listener);
 *
 * \comment{Accessor access}
 * wl_event_loop *loop = ...;
 * wl_event_loop_add_destroy_listener(loop, &your_listener);
 * ~~~
 *
 * If the listener is part of a larger struct, #wl_container_of can be used
 * to retrieve a pointer to it:
 *
 * \code
 * void your_listener(struct wl_listener *listener, void *data)
 * {
 * 	struct your_data *data;
 *
 * 	your_data = wl_container_of(listener, data, your_member_name);
 * }
 * \endcode
 *
 * If you need to remove a listener from a signal, use wl_list_remove().
 *
 * \code
 * wl_list_remove(&your_listener.link);
 * \endcode
 *
 * \sa wl_signal
 */
struct wl_listener {
	struct wl_list link;
	wl_notify_func_t notify;
};

/** \class wl_signal
 *
 * \brief A source of a type of observable event
 *
 * Signals are recognized points where significant events can be observed.
 * Compositors as well as the server can provide signals. Observers are
 * wl_listener's that are added through #wl_signal_add. Signals are emitted
 * using #wl_signal_emit, which will invoke all listeners until that
 * listener is removed by wl_list_remove() (or whenever the signal is
 * destroyed).
 *
 * \sa wl_listener for more information on using wl_signal
 */
struct wl_signal {
	struct wl_list listener_list;
};

/** Initialize a new \ref wl_signal for use.
 *
 * \param signal The signal that will be initialized
 *
 * \memberof wl_signal
 */
static inline void
wl_signal_init(struct wl_signal *signal)
{
	wl_list_init(&signal->listener_list);
}

/** Add the specified listener to this signal.
 *
 * \param signal The signal that will emit events to the listener
 * \param listener The listener to add
 *
 * \memberof wl_signal
 */
static inline void
wl_signal_add(struct wl_signal *signal, struct wl_listener *listener)
{
	wl_list_insert(signal->listener_list.prev, &listener->link);
}

/** Gets the listener struct for the specified callback.
 *
 * \param signal The signal that contains the specified listener
 * \param notify The listener that is the target of this search
 * \return the list item that corresponds to the specified listener, or NULL
 * if none was found
 *
 * \memberof wl_signal
 */
static inline struct wl_listener *
wl_signal_get(struct wl_signal *signal, wl_notify_func_t notify)
{
	struct wl_listener *l;

	wl_list_for_each(l, &signal->listener_list, link)
		if (l->notify == notify)
			return l;

	return NULL;
}

/** Emits this signal, notifying all registered listeners.
 *
 * \param signal The signal object that will emit the signal
 * \param data The data that will be emitted with the signal
 *
 * \memberof wl_signal
 */
static inline void
wl_signal_emit(struct wl_signal *signal, void *data)
{
	struct wl_listener *l, *next;

	wl_list_for_each_safe(l, next, &signal->listener_list, link)
		l->notify(l, data);
}

typedef void (*wl_resource_destroy_func_t)(struct wl_resource *resource);

#ifndef WL_HIDE_DEPRECATED

struct wl_object {
	const struct wl_interface *interface;
	const void *implementation;
	uint32_t id;
};

struct wl_resource {
	struct wl_object object;
	wl_resource_destroy_func_t destroy;
	struct wl_list link;
	struct wl_signal destroy_signal;
	struct wl_client *client;
	void *data;
};

struct wl_buffer {
	struct wl_resource resource;
	int32_t width, height;
	uint32_t busy_count;
} WL_DEPRECATED;


uint32_t
wl_client_add_resource(struct wl_client *client,
		       struct wl_resource *resource) WL_DEPRECATED;

struct wl_resource *
wl_client_add_object(struct wl_client *client,
		     const struct wl_interface *interface,
		     const void *implementation,
		     uint32_t id, void *data) WL_DEPRECATED;
struct wl_resource *
wl_client_new_object(struct wl_client *client,
		     const struct wl_interface *interface,
		     const void *implementation, void *data) WL_DEPRECATED;

struct wl_global *
wl_display_add_global(struct wl_display *display,
		      const struct wl_interface *interface,
		      void *data,
		      wl_global_bind_func_t bind) WL_DEPRECATED;

void
wl_display_remove_global(struct wl_display *display,
			 struct wl_global *global) WL_DEPRECATED;

#endif

/*
 * Post an event to the client's object referred to by 'resource'.
 * 'opcode' is the event number generated from the protocol XML
 * description (the event name). The variable arguments are the event
 * parameters, in the order they appear in the protocol XML specification.
 *
 * The variable arguments' types are:
 * - type=uint: 	uint32_t
 * - type=int:		int32_t
 * - type=fixed:	wl_fixed_t
 * - type=string:	(const char *) to a nil-terminated string
 * - type=array:	(struct wl_array *)
 * - type=fd:		int, that is an open file descriptor
 * - type=new_id:	(struct wl_object *) or (struct wl_resource *)
 * - type=object:	(struct wl_object *) or (struct wl_resource *)
 */
void wl_resource_post_event(struct wl_resource *resource,
			    uint32_t opcode, ...);
void wl_resource_post_event_array(struct wl_resource *resource,
				  uint32_t opcode, union wl_argument *args);
void wl_resource_queue_event(struct wl_resource *resource,
			     uint32_t opcode, ...);
void wl_resource_queue_event_array(struct wl_resource *resource,
				   uint32_t opcode, union wl_argument *args);

/* msg is a printf format string, variable args are its args. */
void wl_resource_post_error(struct wl_resource *resource,
			    uint32_t code, const char *msg, ...)
	__attribute__ ((format (printf, 3, 4)));
void wl_resource_post_no_memory(struct wl_resource *resource);

#include "wayland-server-protocol.h"

struct wl_display *
wl_client_get_display(struct wl_client *client);

struct wl_resource *
wl_resource_create(struct wl_client *client,
		   const struct wl_interface *interface,
		   int version, uint32_t id);
void
wl_resource_set_implementation(struct wl_resource *resource,
			       const void *implementation,
			       void *data,
			       wl_resource_destroy_func_t destroy);
void
wl_resource_set_dispatcher(struct wl_resource *resource,
			   wl_dispatcher_func_t dispatcher,
			   const void *implementation,
			   void *data,
			   wl_resource_destroy_func_t destroy);

void
wl_resource_destroy(struct wl_resource *resource);
uint32_t
wl_resource_get_id(struct wl_resource *resource);
struct wl_list *
wl_resource_get_link(struct wl_resource *resource);
struct wl_resource *
wl_resource_from_link(struct wl_list *resource);
struct wl_resource *
wl_resource_find_for_client(struct wl_list *list, struct wl_client *client);
struct wl_client *
wl_resource_get_client(struct wl_resource *resource);
void
wl_resource_set_user_data(struct wl_resource *resource, void *data);
void *
wl_resource_get_user_data(struct wl_resource *resource);
int
wl_resource_get_version(struct wl_resource *resource);
void
wl_resource_set_destructor(struct wl_resource *resource,
			   wl_resource_destroy_func_t destroy);
int
wl_resource_instance_of(struct wl_resource *resource,
			const struct wl_interface *interface,
			const void *implementation);

void
wl_resource_add_destroy_listener(struct wl_resource *resource,
				 struct wl_listener * listener);
struct wl_listener *
wl_resource_get_destroy_listener(struct wl_resource *resource,
				 wl_notify_func_t notify);

#define wl_resource_for_each(resource, list)					\
	for (resource = 0, resource = wl_resource_from_link((list)->next);	\
	     wl_resource_get_link(resource) != (list);				\
	     resource = wl_resource_from_link(wl_resource_get_link(resource)->next))

#define wl_resource_for_each_safe(resource, tmp, list)					\
	for (resource = 0, tmp = 0,							\
	     resource = wl_resource_from_link((list)->next),	\
	     tmp = wl_resource_from_link((list)->next->next);	\
	     wl_resource_get_link(resource) != (list);				\
	     resource = tmp,							\
	     tmp = wl_resource_from_link(wl_resource_get_link(resource)->next))

struct wl_shm_buffer;

void
wl_shm_buffer_begin_access(struct wl_shm_buffer *buffer);

void
wl_shm_buffer_end_access(struct wl_shm_buffer *buffer);

struct wl_shm_buffer *
wl_shm_buffer_get(struct wl_resource *resource);

void *
wl_shm_buffer_get_data(struct wl_shm_buffer *buffer);

int32_t
wl_shm_buffer_get_stride(struct wl_shm_buffer *buffer);

uint32_t
wl_shm_buffer_get_format(struct wl_shm_buffer *buffer);

int32_t
wl_shm_buffer_get_width(struct wl_shm_buffer *buffer);

int32_t
wl_shm_buffer_get_height(struct wl_shm_buffer *buffer);

int
wl_display_init_shm(struct wl_display *display);

uint32_t *
wl_display_add_shm_format(struct wl_display *display, uint32_t format);

struct wl_shm_buffer *
wl_shm_buffer_create(struct wl_client *client,
		     uint32_t id, int32_t width, int32_t height,
		     int32_t stride, uint32_t format);

void wl_log_set_handler_server(wl_log_func_t handler);

#ifdef  __cplusplus
}
#endif

#endif