weston/libweston/launcher-libseat.c
Kenny Levinsen 6c4a993a99 libweston/launcher: libseat backend
This adds support for libseat as a seat backend. libseat provides seatd,
(e)logind and direct seat backends as compile-time and runtime options.

The backend is currently disabled by default. It can be enabled through the
launcher-libseat option.

Signed-off-by: Kenny Levinsen <kl@kl.wtf>
2021-04-14 09:22:17 +00:00

256 lines
5.9 KiB
C

/*
* Copyright © 2020 Kenny Levinsen
*
* Permission is hereby granted, free of charge, to any person obtaining
* a copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sublicense, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice (including the
* next paragraph) shall be included in all copies or substantial
* portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
#include "config.h"
#include <errno.h>
#include <fcntl.h>
#include <signal.h>
#include <stdarg.h>
#include <stdbool.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/stat.h>
#include <unistd.h>
#include <libseat.h>
#include <libweston/libweston.h>
#include "backend.h"
#include "dbus.h"
#include "launcher-impl.h"
struct launcher_libseat_device {
struct wl_list link;
int fd;
int device_id;
dev_t fsdev;
};
struct launcher_libseat {
struct weston_launcher base;
struct weston_compositor *compositor;
struct libseat *seat;
struct wl_event_source *seat_ctx;
struct wl_list devices;
};
static struct launcher_libseat_device *
find_device_by_fd(struct launcher_libseat *wl, int fd)
{
struct launcher_libseat_device *dev;
wl_list_for_each(dev, &wl->devices, link) {
if (dev->fd == fd) {
return dev;
}
}
return NULL;
}
static void
handle_enable_seat(struct libseat *seat, void *data)
{
struct launcher_libseat *wl = data;
if (wl->compositor->session_active)
return;
wl->compositor->session_active = true;
wl_signal_emit(&wl->compositor->session_signal,
wl->compositor);
}
static void
handle_disable_seat(struct libseat *seat, void *data)
{
struct launcher_libseat *wl = data;
if (!wl->compositor->session_active)
return;
wl->compositor->session_active = false;
wl_signal_emit(&wl->compositor->session_signal,
wl->compositor);
libseat_disable_seat(wl->seat);
}
static struct libseat_seat_listener seat_listener = {
.enable_seat = handle_enable_seat,
.disable_seat = handle_disable_seat,
};
static int
seat_open_device(struct weston_launcher *launcher, const char *path, int flags)
{
struct launcher_libseat *wl = wl_container_of(launcher, wl, base);
struct launcher_libseat_device *dev;
struct stat st;
dev = zalloc(sizeof(struct launcher_libseat_device));
if (dev == NULL) {
goto err_alloc;
}
dev->device_id = libseat_open_device(wl->seat, path, &dev->fd);
if (dev->device_id == -1) {
goto err_open;
}
if (fstat(dev->fd, &st) == -1) {
goto err_fd;
}
dev->fsdev = st.st_rdev;
wl_list_insert(&wl->devices, &dev->link);
return dev->fd;
err_fd:
libseat_close_device(wl->seat, dev->device_id);
close(dev->fd);
err_open:
free(dev);
err_alloc:
return -1;
}
static void
seat_close_device(struct weston_launcher *launcher, int fd)
{
struct launcher_libseat *wl = wl_container_of(launcher, wl, base);
struct launcher_libseat_device *dev;
dev = find_device_by_fd(wl, fd);
if (dev == NULL) {
weston_log("libseat: No device with fd %d found\n", fd);
close(fd);
return;
}
if (libseat_close_device(wl->seat, dev->device_id) == -1) {
weston_log("libseat: Could not close device %d",
dev->device_id);
}
wl_list_remove(&dev->link);
free(dev);
close(fd);
}
static int
seat_switch_session(struct weston_launcher *launcher, int vt)
{
struct launcher_libseat *wl = wl_container_of(launcher, wl, base);
return libseat_switch_session(wl->seat, vt);
}
static int
libseat_event(int fd, uint32_t mask, void *data)
{
struct libseat *seat = data;
if (libseat_dispatch(seat, 0) == -1) {
weston_log("libseat: dispatch failed: %s\n", strerror(errno));
exit(-1);
}
return 1;
}
static int
seat_open(struct weston_launcher **out, struct weston_compositor *compositor,
int tty, const char *seat_id, bool sync_drm)
{
struct launcher_libseat *wl;
struct wl_event_loop *event_loop;
wl = zalloc(sizeof(*wl));
if (wl == NULL) {
goto err_out;
}
wl->base.iface = &launcher_libseat_iface;
wl->compositor = compositor;
wl_list_init(&wl->devices);
wl->seat = libseat_open_seat(&seat_listener, wl);
if (wl->seat == NULL) {
weston_log("libseat: could not open seat\n");
goto err_seat;
}
event_loop = wl_display_get_event_loop(compositor->wl_display);
wl->seat_ctx = wl_event_loop_add_fd(event_loop,
libseat_get_fd(wl->seat), WL_EVENT_READABLE,
libseat_event, wl->seat);
if (wl->seat_ctx == NULL) {
weston_log("libseat: could not register connection to event loop\n");
goto err_session;
}
if (libseat_dispatch(wl->seat, 0) == -1) {
weston_log("libseat: dispatch failed\n");
goto err_session;
}
weston_log("libseat: session control granted\n");
*out = &wl->base;
return 0;
err_session:
libseat_close_seat(wl->seat);
err_seat:
free(wl);
err_out:
return -1;
}
static void
seat_close(struct weston_launcher *launcher)
{
struct launcher_libseat *wl = wl_container_of(launcher, wl, base);
if (wl->seat != NULL) {
libseat_close_seat(wl->seat);
}
wl_event_source_remove(wl->seat_ctx);
free(wl);
}
static int
seat_get_vt(struct weston_launcher *launcher)
{
return -ENOSYS;
}
const struct launcher_interface launcher_libseat_iface = {
.name = "libseat",
.connect = seat_open,
.destroy = seat_close,
.open = seat_open_device,
.close = seat_close_device,
.activate_vt = seat_switch_session,
.get_vt = seat_get_vt,
};