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/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
/***
This file is part of systemd.
Copyright (C) 2014 David Herrmann <dh.herrmann@gmail.com>
systemd is free software; you can redistribute it and/or modify it
under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation; either version 2.1 of the License, or
(at your option) any later version.
systemd is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with systemd; If not, see <http://www.gnu.org/licenses/>.
***/
/*
* System View
* The sysview interface scans and monitors the system for seats, sessions and
* devices. It basically mirrors the state of logind on the application side.
* It's meant as base for session services that require managed device access.
* The logind controller API is employed to allow unprivileged access to all
* devices of a user.
* Furthermore, the sysview interface can be used for system services that run
* in situations where logind is not available, but session-like services are
* needed. For instance, the initrd does not run logind but might require
* graphics access. It cannot run session services, though. The sysview
* interface pretends that a session is available and provides the same
* interface as to normal session services.
*/
#pragma once
#include <inttypes.h>
#include <libudev.h>
#include <stdbool.h>
#include <stdlib.h>
#include <systemd/sd-bus.h>
#include <systemd/sd-event.h>
#include "util.h"
typedef struct sysview_event sysview_event;
typedef struct sysview_device sysview_device;
typedef struct sysview_session sysview_session;
typedef struct sysview_seat sysview_seat;
typedef struct sysview_context sysview_context;
/*
* Events
*/
enum {
SYSVIEW_EVENT_SEAT_ADD,
SYSVIEW_EVENT_SEAT_REMOVE,
SYSVIEW_EVENT_SESSION_FILTER,
SYSVIEW_EVENT_SESSION_ADD,
SYSVIEW_EVENT_SESSION_REMOVE,
SYSVIEW_EVENT_SESSION_ATTACH,
SYSVIEW_EVENT_SESSION_DETACH,
SYSVIEW_EVENT_SESSION_CONTROL,
SYSVIEW_EVENT_DEVICE_CHANGE,
};
struct sysview_event {
unsigned int type;
union {
struct {
sysview_seat *seat;
} seat_add, seat_remove;
struct {
const char *id;
const char *seatid;
const char *username;
unsigned int uid;
} session_filter;
struct {
sysview_session *session;
} session_add, session_remove;
struct {
sysview_session *session;
sysview_device *device;
} session_attach, session_detach;
struct {
sysview_session *session;
int error;
} session_control;
struct {
sysview_device *device;
struct udev_device *ud;
} device_change;
};
};
typedef int (*sysview_event_fn) (sysview_context *c, void *userdata, sysview_event *e);
/*
* Devices
*/
enum {
SYSVIEW_DEVICE_EVDEV,
SYSVIEW_DEVICE_DRM,
SYSVIEW_DEVICE_CNT
};
unsigned int sysview_device_get_type(sysview_device *device);
struct udev_device *sysview_device_get_ud(sysview_device *device);
/*
* Sessions
*/
const char *sysview_session_get_name(sysview_session *session);
int sysview_session_take_control(sysview_session *session);
void sysview_session_release_control(sysview_session *session);
/*
* Seats
*/
const char *sysview_seat_get_name(sysview_seat *seat);
/*
* Contexts
*/
enum {
SYSVIEW_CONTEXT_SCAN_LOGIND = (1 << 0),
SYSVIEW_CONTEXT_SCAN_EVDEV = (1 << 1),
SYSVIEW_CONTEXT_SCAN_DRM = (1 << 2),
};
int sysview_context_new(sysview_context **out,
unsigned int flags,
sd_event *event,
sd_bus *sysbus,
struct udev *ud);
sysview_context *sysview_context_free(sysview_context *c);
DEFINE_TRIVIAL_CLEANUP_FUNC(sysview_context*, sysview_context_free);
bool sysview_context_is_running(sysview_context *c);
int sysview_context_start(sysview_context *c, sysview_event_fn event_fn, void *userdata);
void sysview_context_stop(sysview_context *c);
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