---@meta

---@class SessiondDevice
---@field subsystem string udev subsystem, for example "drm" or "input"
---@field sysname string Kernel device name, for example "card0"
---@field syspath string Absolute sysfs path
local Device = {}

---@class SessiondSeat
local Seat = {}

---Make this seat the default seat.
---@return nil
function Seat:default() end

---Restrict this seat to a user.
---@param username string
---@return nil
function Seat:user(username) end

---Set the access group associated with this seat.
---@param groupname string
---@return nil
function Seat:group(groupname) end

---Register a device matcher for this seat.
---@param matcher fun(device: SessiondDevice): boolean
---@return nil
function Seat:attach(matcher) end

---Register a session matcher for this seat.
---@param matcher fun(session: SessiondSession): boolean
---@return nil
function Seat:session(matcher) end

---@class SessiondSession
---@field id integer Session identifier
---@field uid integer User identifier
---@field username string
---@field class string Session class, for example "user" or "greeter"
---@field vt integer|nil Virtual terminal number, if any
---@field leader integer PID of the session leader
---@field timestamp integer Session start timestamp
---@field is_local boolean
---@field remote_host string Empty for local sessions
---@field active "online"|"active"|"closing"|"opening"
local Session = {}

---@class SessiondSeats
local Seats = {}

---Get an existing seat.
---@param name string
---@return SessiondSeat
function Seats:get(name) end

---Create a new seat.
---@param name string
---@return SessiondSeat
function Seats:create(name) end

---Set the default seat by name.
---@param name string
---@return nil
function Seats:default(name) end

---@class Sessiond
---@field seats SessiondSeats
---@type Sessiond
sessiond = {}