This source file includes following definitions.
- session_device_notify
- sd_eviocrevoke
- sd_drmsetmaster
- sd_drmdropmaster
- session_device_open
- session_device_start
- session_device_stop
- detect_device_type
- session_device_verify
- session_device_new
- session_device_free
- session_device_complete_pause
- session_device_resume_all
- session_device_pause_all
- session_device_try_pause_all
#include <assert.h>
#include <fcntl.h>
#include <libudev.h>
#include <linux/input.h>
#include <linux/ioctl.h>
#include <string.h>
#include <sys/ioctl.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <unistd.h>
#include "util.h"
#include "missing.h"
#include "bus-util.h"
#include "logind-session-device.h"
enum SessionDeviceNotifications {
SESSION_DEVICE_RESUME,
SESSION_DEVICE_TRY_PAUSE,
SESSION_DEVICE_PAUSE,
SESSION_DEVICE_RELEASE,
};
static int session_device_notify(SessionDevice *sd, enum SessionDeviceNotifications type) {
_cleanup_bus_message_unref_ sd_bus_message *m = NULL;
_cleanup_free_ char *path = NULL;
const char *t = NULL;
uint32_t major, minor;
int r;
assert(sd);
major = major(sd->dev);
minor = minor(sd->dev);
if (!sd->session->controller)
return 0;
path = session_bus_path(sd->session);
if (!path)
return -ENOMEM;
r = sd_bus_message_new_signal(
sd->session->manager->bus,
&m, path,
"org.freedesktop.login1.Session",
(type == SESSION_DEVICE_RESUME) ? "ResumeDevice" : "PauseDevice");
if (!m)
return r;
r = sd_bus_message_set_destination(m, sd->session->controller);
if (r < 0)
return r;
switch (type) {
case SESSION_DEVICE_RESUME:
r = sd_bus_message_append(m, "uuh", major, minor, sd->fd);
if (r < 0)
return r;
break;
case SESSION_DEVICE_TRY_PAUSE:
t = "pause";
break;
case SESSION_DEVICE_PAUSE:
t = "force";
break;
case SESSION_DEVICE_RELEASE:
t = "gone";
break;
default:
return -EINVAL;
}
if (t) {
r = sd_bus_message_append(m, "uus", major, minor, t);
if (r < 0)
return r;
}
return sd_bus_send(sd->session->manager->bus, m, NULL);
}
static int sd_eviocrevoke(int fd) {
static bool warned;
int r;
assert(fd >= 0);
r = ioctl(fd, EVIOCREVOKE, NULL);
if (r < 0) {
r = -errno;
if (r == -EINVAL && !warned) {
warned = true;
log_warning("kernel does not support evdev-revocation");
}
}
return 0;
}
static int sd_drmsetmaster(int fd) {
int r;
assert(fd >= 0);
r = ioctl(fd, DRM_IOCTL_SET_MASTER, 0);
if (r < 0)
return -errno;
return 0;
}
static int sd_drmdropmaster(int fd) {
int r;
assert(fd >= 0);
r = ioctl(fd, DRM_IOCTL_DROP_MASTER, 0);
if (r < 0)
return -errno;
return 0;
}
static int session_device_open(SessionDevice *sd, bool active) {
int fd, r;
assert(sd->type != DEVICE_TYPE_UNKNOWN);
fd = open(sd->node, O_RDWR|O_CLOEXEC|O_NOCTTY|O_NONBLOCK);
if (fd < 0)
return -errno;
switch (sd->type) {
case DEVICE_TYPE_DRM:
if (active) {
r = sd_drmsetmaster(fd);
if (r < 0) {
close_nointr(fd);
return r;
}
} else {
sd_drmdropmaster(fd);
}
break;
case DEVICE_TYPE_EVDEV:
if (!active)
sd_eviocrevoke(fd);
break;
case DEVICE_TYPE_UNKNOWN:
default:
break;
}
return fd;
}
static int session_device_start(SessionDevice *sd) {
int r;
assert(sd);
assert(session_is_active(sd->session));
if (sd->active)
return 0;
switch (sd->type) {
case DEVICE_TYPE_DRM:
r = sd_drmsetmaster(sd->fd);
if (r < 0)
return r;
break;
case DEVICE_TYPE_EVDEV:
r = session_device_open(sd, true);
if (r < 0)
return r;
close_nointr(sd->fd);
sd->fd = r;
break;
case DEVICE_TYPE_UNKNOWN:
default:
break;
}
sd->active = true;
return 0;
}
static void session_device_stop(SessionDevice *sd) {
assert(sd);
if (!sd->active)
return;
switch (sd->type) {
case DEVICE_TYPE_DRM:
sd_drmdropmaster(sd->fd);
break;
case DEVICE_TYPE_EVDEV:
sd_eviocrevoke(sd->fd);
break;
case DEVICE_TYPE_UNKNOWN:
default:
break;
}
sd->active = false;
}
static DeviceType detect_device_type(struct udev_device *dev) {
const char *sysname, *subsystem;
DeviceType type;
sysname = udev_device_get_sysname(dev);
subsystem = udev_device_get_subsystem(dev);
type = DEVICE_TYPE_UNKNOWN;
if (streq_ptr(subsystem, "drm")) {
if (startswith(sysname, "card"))
type = DEVICE_TYPE_DRM;
} else if (streq_ptr(subsystem, "input")) {
if (startswith(sysname, "event"))
type = DEVICE_TYPE_EVDEV;
}
return type;
}
static int session_device_verify(SessionDevice *sd) {
struct udev_device *dev, *p = NULL;
const char *sp, *node;
int r;
dev = udev_device_new_from_devnum(sd->session->manager->udev, 'c', sd->dev);
if (!dev)
return -ENODEV;
sp = udev_device_get_syspath(dev);
node = udev_device_get_devnode(dev);
if (!node) {
r = -EINVAL;
goto err_dev;
}
sd->type = detect_device_type(dev);
if (sd->type == DEVICE_TYPE_UNKNOWN) {
r = -ENODEV;
goto err_dev;
} else if (sd->type == DEVICE_TYPE_EVDEV) {
p = dev;
dev = udev_device_get_parent_with_subsystem_devtype(p, "input", NULL);
if (!dev) {
r = -ENODEV;
goto err_dev;
}
sp = udev_device_get_syspath(dev);
} else if (sd->type != DEVICE_TYPE_DRM) {
r = -ENODEV;
goto err_dev;
}
sd->device = hashmap_get(sd->session->manager->devices, sp);
if (!sd->device) {
r = manager_process_seat_device(sd->session->manager, dev);
if (r < 0)
goto err_dev;
sd->device = hashmap_get(sd->session->manager->devices, sp);
if (!sd->device) {
r = -ENODEV;
goto err_dev;
}
}
if (sd->device->seat != sd->session->seat) {
r = -EPERM;
goto err_dev;
}
sd->node = strdup(node);
if (!sd->node) {
r = -ENOMEM;
goto err_dev;
}
r = 0;
err_dev:
udev_device_unref(p ? : dev);
return r;
}
int session_device_new(Session *s, dev_t dev, SessionDevice **out) {
SessionDevice *sd;
int r;
assert(s);
assert(out);
if (!s->seat)
return -EPERM;
sd = new0(SessionDevice, 1);
if (!sd)
return -ENOMEM;
sd->session = s;
sd->dev = dev;
sd->fd = -1;
sd->type = DEVICE_TYPE_UNKNOWN;
r = session_device_verify(sd);
if (r < 0)
goto error;
r = hashmap_put(s->devices, &sd->dev, sd);
if (r < 0) {
r = -ENOMEM;
goto error;
}
sd->active = session_is_active(s);
r = session_device_open(sd, sd->active);
if (r < 0) {
if (sd->active && r == -EINVAL) {
sd->active = false;
r = session_device_open(sd, false);
}
if (r < 0)
goto error;
}
sd->fd = r;
LIST_PREPEND(sd_by_device, sd->device->session_devices, sd);
*out = sd;
return 0;
error:
hashmap_remove(s->devices, &sd->dev);
free(sd->node);
free(sd);
return r;
}
void session_device_free(SessionDevice *sd) {
assert(sd);
session_device_stop(sd);
session_device_notify(sd, SESSION_DEVICE_RELEASE);
close_nointr(sd->fd);
LIST_REMOVE(sd_by_device, sd->device->session_devices, sd);
hashmap_remove(sd->session->devices, &sd->dev);
free(sd->node);
free(sd);
}
void session_device_complete_pause(SessionDevice *sd) {
SessionDevice *iter;
Iterator i;
if (!sd->active)
return;
session_device_stop(sd);
HASHMAP_FOREACH(iter, sd->session->devices, i)
if (iter->active)
return;
seat_complete_switch(sd->session->seat);
}
void session_device_resume_all(Session *s) {
SessionDevice *sd;
Iterator i;
int r;
assert(s);
HASHMAP_FOREACH(sd, s->devices, i) {
if (!sd->active) {
r = session_device_start(sd);
if (!r)
session_device_notify(sd, SESSION_DEVICE_RESUME);
}
}
}
void session_device_pause_all(Session *s) {
SessionDevice *sd;
Iterator i;
assert(s);
HASHMAP_FOREACH(sd, s->devices, i) {
if (sd->active) {
session_device_stop(sd);
session_device_notify(sd, SESSION_DEVICE_PAUSE);
}
}
}
unsigned int session_device_try_pause_all(Session *s) {
SessionDevice *sd;
Iterator i;
unsigned int num_pending = 0;
assert(s);
HASHMAP_FOREACH(sd, s->devices, i) {
if (sd->active) {
session_device_notify(sd, SESSION_DEVICE_TRY_PAUSE);
++num_pending;
}
}
return num_pending;
}