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#ifndef WLR_BACKEND_SESSION_H
#define WLR_BACKEND_SESSION_H
#include <stdbool.h>
#include <sys/types.h>
#include <wayland-server-core.h>
struct libseat;
/**
* An opened physical device.
*/
struct wlr_device {
int fd;
int device_id;
dev_t dev;
struct wl_list link; // wlr_session.devices
struct {
struct wl_signal change; // struct wlr_device_change_event
struct wl_signal remove;
} events;
};
/**
* A session manages access to physical devices (such as GPUs and input
* devices).
*
* A session is only required when running on bare metal (e.g. with the KMS or
* libinput backends).
*
* The session listens for device hotplug events, and relays that information
* via the add_drm_card event and the change/remove events on struct wlr_device.
* The session provides functions to gain access to physical device (which is a
* privileged operation), see wlr_session_open_file(). The session also keeps
* track of the virtual terminal state (allowing users to switch between
* compositors or TTYs), see wlr_session_change_vt() and the active event.
*/
struct wlr_session {
/*
* Signal for when the session becomes active/inactive.
* It's called when we swap virtual terminal.
*/
bool active;
char seat[256];
struct udev *udev;
struct udev_monitor *mon;
struct wl_event_source *udev_event;
struct libseat *seat_handle;
struct wl_event_source *libseat_event;
struct wl_list devices; // wlr_device.link
struct wl_event_loop *event_loop;
struct {
struct wl_signal active;
struct wl_signal add_drm_card; // struct wlr_session_add_event
struct wl_signal destroy;
} events;
struct {
struct wl_listener event_loop_destroy;
} WLR_PRIVATE;
};
struct wlr_session_add_event {
const char *path;
};
enum wlr_device_change_type {
WLR_DEVICE_HOTPLUG = 1,
WLR_DEVICE_LEASE,
};
struct wlr_device_hotplug_event {
uint32_t connector_id;
uint32_t prop_id;
};
struct wlr_device_change_event {
enum wlr_device_change_type type;
union {
struct wlr_device_hotplug_event hotplug;
};
};
/*
* Opens a session, taking control of the current virtual terminal.
* This should not be called if another program is already in control
* of the terminal (Xorg, another Wayland compositor, etc.).
*
* Returns NULL on error.
*/
struct wlr_session *wlr_session_create(struct wl_event_loop *loop);
/*
* Closes a previously opened session and restores the virtual terminal.
* You should call wlr_session_close_file() on each files you opened
* with wlr_session_open_file() before you call this.
*/
void wlr_session_destroy(struct wlr_session *session);
/*
* Opens the file at path.
*
* This can only be used to open DRM or evdev (input) devices. Files opened via
* this function must be closed by calling wlr_session_close_file().
*
* When the session becomes inactive:
*
* - DRM files lose their DRM master status
* - evdev files become invalid and should be closed
*/
struct wlr_device *wlr_session_open_file(struct wlr_session *session,
const char *path);
/*
* Closes a file previously opened with wlr_session_open_file().
*/
void wlr_session_close_file(struct wlr_session *session,
struct wlr_device *device);
/*
* Changes the virtual terminal.
*/
bool wlr_session_change_vt(struct wlr_session *session, unsigned vt);
/**
* Enumerate and open KMS devices.
*
* ret is filled with up to ret_len devices. The number of devices ret has been
* filled with is returned on success. If more devices than ret_len are probed,
* the extraneous ones are ignored. If there is no KMS device, the function
* will block until such device is detected up to a timeout. The first device
* returned is the default device (marked as "boot_vga" by the kernel).
*
* On error, or if no device was found, -1 is returned.
*/
ssize_t wlr_session_find_gpus(struct wlr_session *session,
size_t ret_len, struct wlr_device **ret);
#endif
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