2011-05-23 23:55:06 +02:00
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/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
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/***
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This file is part of systemd.
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Copyright 2011 Lennart Poettering
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systemd is free software; you can redistribute it and/or modify it
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2012-04-12 00:20:58 +02:00
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under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 2.1 of the License, or
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2011-05-23 23:55:06 +02:00
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(at your option) any later version.
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systemd is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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2012-04-12 00:20:58 +02:00
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Lesser General Public License for more details.
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2011-05-23 23:55:06 +02:00
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2012-04-12 00:20:58 +02:00
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You should have received a copy of the GNU Lesser General Public License
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2011-05-23 23:55:06 +02:00
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along with systemd; If not, see <http://www.gnu.org/licenses/>.
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***/
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#include <errno.h>
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#include <string.h>
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#include <unistd.h>
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2011-06-24 23:25:28 +02:00
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#include <sys/epoll.h>
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2011-06-29 00:06:04 +02:00
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#include <fcntl.h>
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2011-05-23 23:55:06 +02:00
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2013-07-02 01:46:30 +02:00
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#include <systemd/sd-id128.h>
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#include <systemd/sd-messages.h>
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2011-05-23 23:55:06 +02:00
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#include "strv.h"
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#include "util.h"
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2012-04-10 21:54:31 +02:00
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#include "mkdir.h"
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2012-05-07 21:36:12 +02:00
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#include "path-util.h"
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2013-02-14 12:26:13 +01:00
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#include "fileio.h"
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2013-07-02 01:46:30 +02:00
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#include "dbus-common.h"
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#include "logind-session.h"
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2011-05-23 23:55:06 +02:00
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2013-09-18 01:00:02 +02:00
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static unsigned devt_hash_func(const void *p) {
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uint64_t u = *(const dev_t*)p;
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return uint64_hash_func(&u);
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}
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static int devt_compare_func(const void *_a, const void *_b) {
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dev_t a, b;
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a = *(const dev_t*) _a;
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b = *(const dev_t*) _b;
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return a < b ? -1 : (a > b ? 1 : 0);
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}
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2013-06-20 03:45:08 +02:00
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Session* session_new(Manager *m, const char *id) {
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2011-05-23 23:55:06 +02:00
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Session *s;
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assert(m);
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assert(id);
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2013-09-16 04:26:56 +02:00
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assert(session_id_valid(id));
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2011-05-23 23:55:06 +02:00
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2011-05-25 00:55:58 +02:00
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s = new0(Session, 1);
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2011-05-23 23:55:06 +02:00
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if (!s)
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return NULL;
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2011-06-24 18:50:50 +02:00
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s->state_file = strappend("/run/systemd/sessions/", id);
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2011-05-23 23:55:06 +02:00
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if (!s->state_file) {
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free(s);
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return NULL;
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}
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2013-09-18 01:00:02 +02:00
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s->devices = hashmap_new(devt_hash_func, devt_compare_func);
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logind: introduce session-devices
A session-device is a device that is bound to a seat and used by a
session-controller to run the session. This currently includes DRM, fbdev
and evdev devices. A session-device can be created via RequestDevice() on
the dbus API of the session. You can drop it via ReleaseDevice() again.
Once the session is destroyed or you drop control of the session, all
session-devices are automatically destroyed.
Session devices follow the session "active" state. A device can be
active/running or inactive/paused. Whenever a session is not the active
session, no session-device of it can be active. That is, if a session is
not in foreground, all session-devices are paused.
Whenever a session becomes active, all devices are resumed/activated by
logind. If it fails, a device may stay paused.
With every session-device you request, you also get a file-descriptor
back. logind keeps a copy of this fd and uses kernel specific calls to
pause/resume the file-descriptors. For example, a DRM fd is muted
by logind as long as a given session is not active. Hence, the fd of the
application is also muted. Once the session gets active, logind unmutes
the fd and the application will get DRM access again.
This, however, requires kernel support. DRM devices provide DRM-Master for
synchronization, evdev devices have EVIOCREVOKE (pending on
linux-input-ML). fbdev devices do not provide such synchronization methods
(and never will).
Note that for evdev devices, we call EVIOCREVOKE once a session gets
inactive. However, this cannot be undone (the fd is still valid but mostly
unusable). So we reopen a new fd once the session is activated and send it
together with the ResumeDevice() signal.
With this infrastructure in place, compositors can now run without
CAP_SYS_ADMIN (that is, without being root). They use RequestControl() to
acquire a session and listen for devices via udev_monitor. For every
device they want to open, they call RequestDevice() on logind. This
returns a fd which they can use now. They no longer have to open the
devices themselves or call any privileged ioctls. This is all done by
logind.
Session-switches are still bound to VTs. Hence, compositors will get
notified via the usual VT mechanisms and can cleanup their state. Once the
VT switch is acknowledged as usual, logind will get notified via sysfs and
pause the old-session's devices and resume the devices of the new session.
To allow using this infrastructure with systems without VTs, we provide
notification signals. logind sends PauseDevice("force") dbus signals to
the current session controller for every device that it pauses. And it
sends ResumeDevice signals for every device that it resumes. For
seats with VTs this is sent _after_ the VT switch is acknowledged. Because
the compositor already acknowledged that it cleaned-up all devices.
However, for seats without VTs, this is used to notify the active
compositor that the session is about to be deactivated. That is, logind
sends PauseDevice("force") for each active device and then performs the
session-switch. The session-switch changes the "Active" property of the
session which can be monitored by the compositor. The new session is
activated and the ResumeDevice events are sent.
For seats without VTs, this is a forced session-switch. As this is not
backwards-compatible (xserver actually crashes, weston drops the related
devices, ..) we also provide an acknowledged session-switch. Note that
this is never used for sessions with VTs. You use the acknowledged
VT-switch on these seats.
An acknowledged session switch sends PauseDevice("pause") instead of
PauseDevice("force") to the active session. It schedules a short timeout
and waits for the session to acknowledge each of them with
PauseDeviceComplete(). Once all are acknowledged, or the session ran out
of time, a PauseDevice("force") is sent for all remaining active devices
and the session switch is performed.
Note that this is only partially implemented, yet, as we don't allow
multi-session without VTs, yet. A follow up commit will hook it up and
implemented the acknowledgements+timeout.
The implementation is quite simple. We use major/minor exclusively to
identify devices on the bus. On RequestDevice() we retrieve the
udev_device from the major/minor and search for an existing "Device"
object. If no exists, we create it. This guarantees us that we are
notified whenever the device changes seats or is removed.
We create a new SessionDevice object and link it to the related Session
and Device. Session->devices is a hashtable to lookup SessionDevice
objects via major/minor. Device->session_devices is a linked list so we
can release all linked session-devices once a device vanishes.
Now we only have to hook this up in seat_set_active() so we correctly
change device states during session-switches. As mentioned earlier, these
are forced state-changes as VTs are currently used exclusively for
multi-session implementations.
Everything else are hooks to release all session-devices once the
controller changes or a session is closed or removed.
2013-09-17 23:39:04 +02:00
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if (!s->devices) {
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free(s->state_file);
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free(s);
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return NULL;
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}
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2012-05-07 21:36:12 +02:00
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s->id = path_get_file_name(s->state_file);
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2011-05-23 23:55:06 +02:00
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if (hashmap_put(m->sessions, s->id, s) < 0) {
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logind: introduce session-devices
A session-device is a device that is bound to a seat and used by a
session-controller to run the session. This currently includes DRM, fbdev
and evdev devices. A session-device can be created via RequestDevice() on
the dbus API of the session. You can drop it via ReleaseDevice() again.
Once the session is destroyed or you drop control of the session, all
session-devices are automatically destroyed.
Session devices follow the session "active" state. A device can be
active/running or inactive/paused. Whenever a session is not the active
session, no session-device of it can be active. That is, if a session is
not in foreground, all session-devices are paused.
Whenever a session becomes active, all devices are resumed/activated by
logind. If it fails, a device may stay paused.
With every session-device you request, you also get a file-descriptor
back. logind keeps a copy of this fd and uses kernel specific calls to
pause/resume the file-descriptors. For example, a DRM fd is muted
by logind as long as a given session is not active. Hence, the fd of the
application is also muted. Once the session gets active, logind unmutes
the fd and the application will get DRM access again.
This, however, requires kernel support. DRM devices provide DRM-Master for
synchronization, evdev devices have EVIOCREVOKE (pending on
linux-input-ML). fbdev devices do not provide such synchronization methods
(and never will).
Note that for evdev devices, we call EVIOCREVOKE once a session gets
inactive. However, this cannot be undone (the fd is still valid but mostly
unusable). So we reopen a new fd once the session is activated and send it
together with the ResumeDevice() signal.
With this infrastructure in place, compositors can now run without
CAP_SYS_ADMIN (that is, without being root). They use RequestControl() to
acquire a session and listen for devices via udev_monitor. For every
device they want to open, they call RequestDevice() on logind. This
returns a fd which they can use now. They no longer have to open the
devices themselves or call any privileged ioctls. This is all done by
logind.
Session-switches are still bound to VTs. Hence, compositors will get
notified via the usual VT mechanisms and can cleanup their state. Once the
VT switch is acknowledged as usual, logind will get notified via sysfs and
pause the old-session's devices and resume the devices of the new session.
To allow using this infrastructure with systems without VTs, we provide
notification signals. logind sends PauseDevice("force") dbus signals to
the current session controller for every device that it pauses. And it
sends ResumeDevice signals for every device that it resumes. For
seats with VTs this is sent _after_ the VT switch is acknowledged. Because
the compositor already acknowledged that it cleaned-up all devices.
However, for seats without VTs, this is used to notify the active
compositor that the session is about to be deactivated. That is, logind
sends PauseDevice("force") for each active device and then performs the
session-switch. The session-switch changes the "Active" property of the
session which can be monitored by the compositor. The new session is
activated and the ResumeDevice events are sent.
For seats without VTs, this is a forced session-switch. As this is not
backwards-compatible (xserver actually crashes, weston drops the related
devices, ..) we also provide an acknowledged session-switch. Note that
this is never used for sessions with VTs. You use the acknowledged
VT-switch on these seats.
An acknowledged session switch sends PauseDevice("pause") instead of
PauseDevice("force") to the active session. It schedules a short timeout
and waits for the session to acknowledge each of them with
PauseDeviceComplete(). Once all are acknowledged, or the session ran out
of time, a PauseDevice("force") is sent for all remaining active devices
and the session switch is performed.
Note that this is only partially implemented, yet, as we don't allow
multi-session without VTs, yet. A follow up commit will hook it up and
implemented the acknowledgements+timeout.
The implementation is quite simple. We use major/minor exclusively to
identify devices on the bus. On RequestDevice() we retrieve the
udev_device from the major/minor and search for an existing "Device"
object. If no exists, we create it. This guarantees us that we are
notified whenever the device changes seats or is removed.
We create a new SessionDevice object and link it to the related Session
and Device. Session->devices is a hashtable to lookup SessionDevice
objects via major/minor. Device->session_devices is a linked list so we
can release all linked session-devices once a device vanishes.
Now we only have to hook this up in seat_set_active() so we correctly
change device states during session-switches. As mentioned earlier, these
are forced state-changes as VTs are currently used exclusively for
multi-session implementations.
Everything else are hooks to release all session-devices once the
controller changes or a session is closed or removed.
2013-09-17 23:39:04 +02:00
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hashmap_free(s->devices);
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2012-04-16 16:47:33 +02:00
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free(s->state_file);
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2011-05-23 23:55:06 +02:00
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free(s);
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return NULL;
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}
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s->manager = m;
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2011-06-29 00:06:04 +02:00
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s->fifo_fd = -1;
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2011-05-23 23:55:06 +02:00
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return s;
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}
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void session_free(Session *s) {
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logind: introduce session-devices
A session-device is a device that is bound to a seat and used by a
session-controller to run the session. This currently includes DRM, fbdev
and evdev devices. A session-device can be created via RequestDevice() on
the dbus API of the session. You can drop it via ReleaseDevice() again.
Once the session is destroyed or you drop control of the session, all
session-devices are automatically destroyed.
Session devices follow the session "active" state. A device can be
active/running or inactive/paused. Whenever a session is not the active
session, no session-device of it can be active. That is, if a session is
not in foreground, all session-devices are paused.
Whenever a session becomes active, all devices are resumed/activated by
logind. If it fails, a device may stay paused.
With every session-device you request, you also get a file-descriptor
back. logind keeps a copy of this fd and uses kernel specific calls to
pause/resume the file-descriptors. For example, a DRM fd is muted
by logind as long as a given session is not active. Hence, the fd of the
application is also muted. Once the session gets active, logind unmutes
the fd and the application will get DRM access again.
This, however, requires kernel support. DRM devices provide DRM-Master for
synchronization, evdev devices have EVIOCREVOKE (pending on
linux-input-ML). fbdev devices do not provide such synchronization methods
(and never will).
Note that for evdev devices, we call EVIOCREVOKE once a session gets
inactive. However, this cannot be undone (the fd is still valid but mostly
unusable). So we reopen a new fd once the session is activated and send it
together with the ResumeDevice() signal.
With this infrastructure in place, compositors can now run without
CAP_SYS_ADMIN (that is, without being root). They use RequestControl() to
acquire a session and listen for devices via udev_monitor. For every
device they want to open, they call RequestDevice() on logind. This
returns a fd which they can use now. They no longer have to open the
devices themselves or call any privileged ioctls. This is all done by
logind.
Session-switches are still bound to VTs. Hence, compositors will get
notified via the usual VT mechanisms and can cleanup their state. Once the
VT switch is acknowledged as usual, logind will get notified via sysfs and
pause the old-session's devices and resume the devices of the new session.
To allow using this infrastructure with systems without VTs, we provide
notification signals. logind sends PauseDevice("force") dbus signals to
the current session controller for every device that it pauses. And it
sends ResumeDevice signals for every device that it resumes. For
seats with VTs this is sent _after_ the VT switch is acknowledged. Because
the compositor already acknowledged that it cleaned-up all devices.
However, for seats without VTs, this is used to notify the active
compositor that the session is about to be deactivated. That is, logind
sends PauseDevice("force") for each active device and then performs the
session-switch. The session-switch changes the "Active" property of the
session which can be monitored by the compositor. The new session is
activated and the ResumeDevice events are sent.
For seats without VTs, this is a forced session-switch. As this is not
backwards-compatible (xserver actually crashes, weston drops the related
devices, ..) we also provide an acknowledged session-switch. Note that
this is never used for sessions with VTs. You use the acknowledged
VT-switch on these seats.
An acknowledged session switch sends PauseDevice("pause") instead of
PauseDevice("force") to the active session. It schedules a short timeout
and waits for the session to acknowledge each of them with
PauseDeviceComplete(). Once all are acknowledged, or the session ran out
of time, a PauseDevice("force") is sent for all remaining active devices
and the session switch is performed.
Note that this is only partially implemented, yet, as we don't allow
multi-session without VTs, yet. A follow up commit will hook it up and
implemented the acknowledgements+timeout.
The implementation is quite simple. We use major/minor exclusively to
identify devices on the bus. On RequestDevice() we retrieve the
udev_device from the major/minor and search for an existing "Device"
object. If no exists, we create it. This guarantees us that we are
notified whenever the device changes seats or is removed.
We create a new SessionDevice object and link it to the related Session
and Device. Session->devices is a hashtable to lookup SessionDevice
objects via major/minor. Device->session_devices is a linked list so we
can release all linked session-devices once a device vanishes.
Now we only have to hook this up in seat_set_active() so we correctly
change device states during session-switches. As mentioned earlier, these
are forced state-changes as VTs are currently used exclusively for
multi-session implementations.
Everything else are hooks to release all session-devices once the
controller changes or a session is closed or removed.
2013-09-17 23:39:04 +02:00
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SessionDevice *sd;
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2011-05-23 23:55:06 +02:00
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assert(s);
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2011-05-25 00:55:58 +02:00
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if (s->in_gc_queue)
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LIST_REMOVE(Session, gc_queue, s->manager->session_gc_queue, s);
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2013-09-17 17:39:56 +02:00
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session_drop_controller(s);
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logind: introduce session-devices
A session-device is a device that is bound to a seat and used by a
session-controller to run the session. This currently includes DRM, fbdev
and evdev devices. A session-device can be created via RequestDevice() on
the dbus API of the session. You can drop it via ReleaseDevice() again.
Once the session is destroyed or you drop control of the session, all
session-devices are automatically destroyed.
Session devices follow the session "active" state. A device can be
active/running or inactive/paused. Whenever a session is not the active
session, no session-device of it can be active. That is, if a session is
not in foreground, all session-devices are paused.
Whenever a session becomes active, all devices are resumed/activated by
logind. If it fails, a device may stay paused.
With every session-device you request, you also get a file-descriptor
back. logind keeps a copy of this fd and uses kernel specific calls to
pause/resume the file-descriptors. For example, a DRM fd is muted
by logind as long as a given session is not active. Hence, the fd of the
application is also muted. Once the session gets active, logind unmutes
the fd and the application will get DRM access again.
This, however, requires kernel support. DRM devices provide DRM-Master for
synchronization, evdev devices have EVIOCREVOKE (pending on
linux-input-ML). fbdev devices do not provide such synchronization methods
(and never will).
Note that for evdev devices, we call EVIOCREVOKE once a session gets
inactive. However, this cannot be undone (the fd is still valid but mostly
unusable). So we reopen a new fd once the session is activated and send it
together with the ResumeDevice() signal.
With this infrastructure in place, compositors can now run without
CAP_SYS_ADMIN (that is, without being root). They use RequestControl() to
acquire a session and listen for devices via udev_monitor. For every
device they want to open, they call RequestDevice() on logind. This
returns a fd which they can use now. They no longer have to open the
devices themselves or call any privileged ioctls. This is all done by
logind.
Session-switches are still bound to VTs. Hence, compositors will get
notified via the usual VT mechanisms and can cleanup their state. Once the
VT switch is acknowledged as usual, logind will get notified via sysfs and
pause the old-session's devices and resume the devices of the new session.
To allow using this infrastructure with systems without VTs, we provide
notification signals. logind sends PauseDevice("force") dbus signals to
the current session controller for every device that it pauses. And it
sends ResumeDevice signals for every device that it resumes. For
seats with VTs this is sent _after_ the VT switch is acknowledged. Because
the compositor already acknowledged that it cleaned-up all devices.
However, for seats without VTs, this is used to notify the active
compositor that the session is about to be deactivated. That is, logind
sends PauseDevice("force") for each active device and then performs the
session-switch. The session-switch changes the "Active" property of the
session which can be monitored by the compositor. The new session is
activated and the ResumeDevice events are sent.
For seats without VTs, this is a forced session-switch. As this is not
backwards-compatible (xserver actually crashes, weston drops the related
devices, ..) we also provide an acknowledged session-switch. Note that
this is never used for sessions with VTs. You use the acknowledged
VT-switch on these seats.
An acknowledged session switch sends PauseDevice("pause") instead of
PauseDevice("force") to the active session. It schedules a short timeout
and waits for the session to acknowledge each of them with
PauseDeviceComplete(). Once all are acknowledged, or the session ran out
of time, a PauseDevice("force") is sent for all remaining active devices
and the session switch is performed.
Note that this is only partially implemented, yet, as we don't allow
multi-session without VTs, yet. A follow up commit will hook it up and
implemented the acknowledgements+timeout.
The implementation is quite simple. We use major/minor exclusively to
identify devices on the bus. On RequestDevice() we retrieve the
udev_device from the major/minor and search for an existing "Device"
object. If no exists, we create it. This guarantees us that we are
notified whenever the device changes seats or is removed.
We create a new SessionDevice object and link it to the related Session
and Device. Session->devices is a hashtable to lookup SessionDevice
objects via major/minor. Device->session_devices is a linked list so we
can release all linked session-devices once a device vanishes.
Now we only have to hook this up in seat_set_active() so we correctly
change device states during session-switches. As mentioned earlier, these
are forced state-changes as VTs are currently used exclusively for
multi-session implementations.
Everything else are hooks to release all session-devices once the
controller changes or a session is closed or removed.
2013-09-17 23:39:04 +02:00
|
|
|
while ((sd = hashmap_first(s->devices)))
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|
session_device_free(sd);
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|
hashmap_free(s->devices);
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|
|
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|
2011-05-23 23:55:06 +02:00
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|
|
if (s->user) {
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|
|
LIST_REMOVE(Session, sessions_by_user, s->user->sessions, s);
|
|
|
|
|
|
|
|
|
|
if (s->user->display == s)
|
|
|
|
|
s->user->display = NULL;
|
|
|
|
|
}
|
|
|
|
|
|
2011-06-21 21:46:13 +02:00
|
|
|
if (s->seat) {
|
|
|
|
|
if (s->seat->active == s)
|
|
|
|
|
s->seat->active = NULL;
|
2013-09-17 23:40:19 +02:00
|
|
|
if (s->seat->pending_switch == s)
|
|
|
|
|
s->seat->pending_switch = NULL;
|
2011-06-21 21:46:13 +02:00
|
|
|
|
2011-05-23 23:55:06 +02:00
|
|
|
LIST_REMOVE(Session, sessions_by_seat, s->seat->sessions, s);
|
2011-06-21 21:46:13 +02:00
|
|
|
}
|
2011-05-23 23:55:06 +02:00
|
|
|
|
2013-07-02 01:46:30 +02:00
|
|
|
if (s->scope) {
|
|
|
|
|
hashmap_remove(s->manager->session_units, s->scope);
|
|
|
|
|
free(s->scope);
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
free(s->scope_job);
|
2011-06-24 20:41:56 +02:00
|
|
|
|
2013-07-02 01:46:30 +02:00
|
|
|
if (s->create_message)
|
|
|
|
|
dbus_message_unref(s->create_message);
|
2011-05-23 23:55:06 +02:00
|
|
|
|
|
|
|
|
free(s->tty);
|
|
|
|
|
free(s->display);
|
|
|
|
|
free(s->remote_host);
|
2011-05-26 02:21:16 +02:00
|
|
|
free(s->remote_user);
|
2011-06-24 18:50:50 +02:00
|
|
|
free(s->service);
|
2011-05-23 23:55:06 +02:00
|
|
|
|
|
|
|
|
hashmap_remove(s->manager->sessions, s->id);
|
2011-06-29 00:06:04 +02:00
|
|
|
session_remove_fifo(s);
|
2011-06-24 18:50:50 +02:00
|
|
|
|
2011-05-25 00:58:55 +02:00
|
|
|
free(s->state_file);
|
2011-05-23 23:55:06 +02:00
|
|
|
free(s);
|
|
|
|
|
}
|
|
|
|
|
|
2013-06-20 03:45:08 +02:00
|
|
|
void session_set_user(Session *s, User *u) {
|
|
|
|
|
assert(s);
|
|
|
|
|
assert(!s->user);
|
|
|
|
|
|
|
|
|
|
s->user = u;
|
|
|
|
|
LIST_PREPEND(Session, sessions_by_user, u->sessions, s);
|
|
|
|
|
}
|
|
|
|
|
|
2011-05-23 23:55:06 +02:00
|
|
|
int session_save(Session *s) {
|
2013-06-06 00:44:16 +02:00
|
|
|
_cleanup_fclose_ FILE *f = NULL;
|
|
|
|
|
_cleanup_free_ char *temp_path = NULL;
|
2011-05-23 23:55:06 +02:00
|
|
|
int r = 0;
|
|
|
|
|
|
|
|
|
|
assert(s);
|
|
|
|
|
|
2013-06-20 03:45:08 +02:00
|
|
|
if (!s->user)
|
|
|
|
|
return -ESTALE;
|
|
|
|
|
|
2011-06-27 23:06:34 +02:00
|
|
|
if (!s->started)
|
|
|
|
|
return 0;
|
|
|
|
|
|
2012-05-31 12:40:20 +02:00
|
|
|
r = mkdir_safe_label("/run/systemd/sessions", 0755, 0, 0);
|
2011-05-23 23:55:06 +02:00
|
|
|
if (r < 0)
|
2011-05-25 00:55:58 +02:00
|
|
|
goto finish;
|
2011-05-23 23:55:06 +02:00
|
|
|
|
2011-05-25 00:55:58 +02:00
|
|
|
r = fopen_temporary(s->state_file, &f, &temp_path);
|
|
|
|
|
if (r < 0)
|
|
|
|
|
goto finish;
|
2011-05-23 23:55:06 +02:00
|
|
|
|
|
|
|
|
assert(s->user);
|
|
|
|
|
|
2011-05-25 00:55:58 +02:00
|
|
|
fchmod(fileno(f), 0644);
|
|
|
|
|
|
2011-05-23 23:55:06 +02:00
|
|
|
fprintf(f,
|
|
|
|
|
"# This is private data. Do not parse.\n"
|
|
|
|
|
"UID=%lu\n"
|
|
|
|
|
"USER=%s\n"
|
|
|
|
|
"ACTIVE=%i\n"
|
2012-06-21 16:14:53 +02:00
|
|
|
"STATE=%s\n"
|
2013-07-02 01:46:30 +02:00
|
|
|
"REMOTE=%i\n",
|
2011-05-23 23:55:06 +02:00
|
|
|
(unsigned long) s->user->uid,
|
|
|
|
|
s->user->name,
|
|
|
|
|
session_is_active(s),
|
2012-06-21 16:14:53 +02:00
|
|
|
session_state_to_string(session_get_state(s)),
|
2013-07-02 01:46:30 +02:00
|
|
|
s->remote);
|
2011-05-23 23:55:06 +02:00
|
|
|
|
2011-06-24 23:50:39 +02:00
|
|
|
if (s->type >= 0)
|
2013-06-06 00:44:16 +02:00
|
|
|
fprintf(f, "TYPE=%s\n", session_type_to_string(s->type));
|
2011-06-24 23:50:39 +02:00
|
|
|
|
2012-02-14 21:33:51 +01:00
|
|
|
if (s->class >= 0)
|
2013-06-06 00:44:16 +02:00
|
|
|
fprintf(f, "CLASS=%s\n", session_class_to_string(s->class));
|
2012-02-14 21:33:51 +01:00
|
|
|
|
2013-07-02 01:46:30 +02:00
|
|
|
if (s->scope)
|
|
|
|
|
fprintf(f, "SCOPE=%s\n", s->scope);
|
|
|
|
|
|
|
|
|
|
if (s->scope_job)
|
|
|
|
|
fprintf(f, "SCOPE_JOB=%s\n", s->scope_job);
|
2011-05-23 23:55:06 +02:00
|
|
|
|
2011-06-29 00:06:04 +02:00
|
|
|
if (s->fifo_path)
|
2013-06-06 00:44:16 +02:00
|
|
|
fprintf(f, "FIFO=%s\n", s->fifo_path);
|
2011-06-29 00:06:04 +02:00
|
|
|
|
2011-05-23 23:55:06 +02:00
|
|
|
if (s->seat)
|
2013-06-06 00:44:16 +02:00
|
|
|
fprintf(f, "SEAT=%s\n", s->seat->id);
|
2011-05-23 23:55:06 +02:00
|
|
|
|
|
|
|
|
if (s->tty)
|
2013-06-06 00:44:16 +02:00
|
|
|
fprintf(f, "TTY=%s\n", s->tty);
|
2011-05-23 23:55:06 +02:00
|
|
|
|
|
|
|
|
if (s->display)
|
2013-06-06 00:44:16 +02:00
|
|
|
fprintf(f, "DISPLAY=%s\n", s->display);
|
2011-05-23 23:55:06 +02:00
|
|
|
|
|
|
|
|
if (s->remote_host)
|
2013-06-06 00:44:16 +02:00
|
|
|
fprintf(f, "REMOTE_HOST=%s\n", s->remote_host);
|
2011-05-23 23:55:06 +02:00
|
|
|
|
2011-05-26 02:21:16 +02:00
|
|
|
if (s->remote_user)
|
2013-06-06 00:44:16 +02:00
|
|
|
fprintf(f, "REMOTE_USER=%s\n", s->remote_user);
|
2011-05-26 02:21:16 +02:00
|
|
|
|
2011-06-24 18:50:50 +02:00
|
|
|
if (s->service)
|
2013-06-06 00:44:16 +02:00
|
|
|
fprintf(f, "SERVICE=%s\n", s->service);
|
2011-06-24 18:50:50 +02:00
|
|
|
|
2013-09-17 17:40:02 +02:00
|
|
|
if (s->seat && seat_has_vts(s->seat))
|
2013-06-06 00:44:16 +02:00
|
|
|
fprintf(f, "VTNR=%i\n", s->vtnr);
|
2011-05-23 23:55:06 +02:00
|
|
|
|
|
|
|
|
if (s->leader > 0)
|
2013-06-06 00:44:16 +02:00
|
|
|
fprintf(f, "LEADER=%lu\n", (unsigned long) s->leader);
|
2011-05-23 23:55:06 +02:00
|
|
|
|
|
|
|
|
if (s->audit_id > 0)
|
2013-06-06 00:44:16 +02:00
|
|
|
fprintf(f, "AUDIT=%"PRIu32"\n", s->audit_id);
|
2011-05-23 23:55:06 +02:00
|
|
|
|
2013-06-20 03:45:08 +02:00
|
|
|
if (dual_timestamp_is_set(&s->timestamp))
|
|
|
|
|
fprintf(f,
|
|
|
|
|
"REALTIME=%llu\n"
|
|
|
|
|
"MONOTONIC=%llu\n",
|
|
|
|
|
(unsigned long long) s->timestamp.realtime,
|
|
|
|
|
(unsigned long long) s->timestamp.monotonic);
|
|
|
|
|
|
2011-05-23 23:55:06 +02:00
|
|
|
fflush(f);
|
2011-05-25 00:55:58 +02:00
|
|
|
|
|
|
|
|
if (ferror(f) || rename(temp_path, s->state_file) < 0) {
|
2011-05-23 23:55:06 +02:00
|
|
|
r = -errno;
|
|
|
|
|
unlink(s->state_file);
|
2011-05-25 00:55:58 +02:00
|
|
|
unlink(temp_path);
|
2011-05-23 23:55:06 +02:00
|
|
|
}
|
|
|
|
|
|
2011-05-25 00:55:58 +02:00
|
|
|
finish:
|
|
|
|
|
if (r < 0)
|
|
|
|
|
log_error("Failed to save session data for %s: %s", s->id, strerror(-r));
|
|
|
|
|
|
2011-05-23 23:55:06 +02:00
|
|
|
return r;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
int session_load(Session *s) {
|
2013-06-20 03:45:08 +02:00
|
|
|
_cleanup_free_ char *remote = NULL,
|
2011-06-17 15:59:18 +02:00
|
|
|
*seat = NULL,
|
|
|
|
|
*vtnr = NULL,
|
|
|
|
|
*leader = NULL,
|
2012-02-14 21:33:51 +01:00
|
|
|
*type = NULL,
|
2013-06-20 03:45:08 +02:00
|
|
|
*class = NULL,
|
|
|
|
|
*uid = NULL,
|
|
|
|
|
*realtime = NULL,
|
|
|
|
|
*monotonic = NULL;
|
2011-06-17 15:59:18 +02:00
|
|
|
|
|
|
|
|
int k, r;
|
|
|
|
|
|
2011-05-23 23:55:06 +02:00
|
|
|
assert(s);
|
|
|
|
|
|
2011-06-17 15:59:18 +02:00
|
|
|
r = parse_env_file(s->state_file, NEWLINE,
|
|
|
|
|
"REMOTE", &remote,
|
2013-07-02 01:46:30 +02:00
|
|
|
"SCOPE", &s->scope,
|
|
|
|
|
"SCOPE_JOB", &s->scope_job,
|
2011-06-29 00:06:04 +02:00
|
|
|
"FIFO", &s->fifo_path,
|
2011-06-17 15:59:18 +02:00
|
|
|
"SEAT", &seat,
|
|
|
|
|
"TTY", &s->tty,
|
|
|
|
|
"DISPLAY", &s->display,
|
|
|
|
|
"REMOTE_HOST", &s->remote_host,
|
|
|
|
|
"REMOTE_USER", &s->remote_user,
|
2011-06-24 18:50:50 +02:00
|
|
|
"SERVICE", &s->service,
|
2011-06-17 15:59:18 +02:00
|
|
|
"VTNR", &vtnr,
|
|
|
|
|
"LEADER", &leader,
|
2011-06-24 23:50:39 +02:00
|
|
|
"TYPE", &type,
|
2012-02-14 21:33:51 +01:00
|
|
|
"CLASS", &class,
|
2013-06-20 03:45:08 +02:00
|
|
|
"UID", &uid,
|
|
|
|
|
"REALTIME", &realtime,
|
|
|
|
|
"MONOTONIC", &monotonic,
|
2011-06-17 15:59:18 +02:00
|
|
|
NULL);
|
|
|
|
|
|
2013-06-20 03:45:08 +02:00
|
|
|
if (r < 0) {
|
|
|
|
|
log_error("Failed to read %s: %s", s->state_file, strerror(-r));
|
|
|
|
|
return r;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
if (!s->user) {
|
|
|
|
|
uid_t u;
|
|
|
|
|
User *user;
|
|
|
|
|
|
|
|
|
|
if (!uid) {
|
|
|
|
|
log_error("UID not specified for session %s", s->id);
|
|
|
|
|
return -ENOENT;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
r = parse_uid(uid, &u);
|
|
|
|
|
if (r < 0) {
|
|
|
|
|
log_error("Failed to parse UID value %s for session %s.", uid, s->id);
|
|
|
|
|
return r;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
user = hashmap_get(s->manager->users, ULONG_TO_PTR((unsigned long) u));
|
|
|
|
|
if (!user) {
|
|
|
|
|
log_error("User of session %s not known.", s->id);
|
|
|
|
|
return -ENOENT;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
session_set_user(s, user);
|
|
|
|
|
}
|
2011-06-17 15:59:18 +02:00
|
|
|
|
|
|
|
|
if (remote) {
|
|
|
|
|
k = parse_boolean(remote);
|
|
|
|
|
if (k >= 0)
|
|
|
|
|
s->remote = k;
|
|
|
|
|
}
|
|
|
|
|
|
2011-06-21 21:46:13 +02:00
|
|
|
if (seat && !s->seat) {
|
2011-06-17 15:59:18 +02:00
|
|
|
Seat *o;
|
|
|
|
|
|
|
|
|
|
o = hashmap_get(s->manager->seats, seat);
|
|
|
|
|
if (o)
|
|
|
|
|
seat_attach_session(o, s);
|
|
|
|
|
}
|
|
|
|
|
|
2013-09-17 17:40:02 +02:00
|
|
|
if (vtnr && s->seat && seat_has_vts(s->seat)) {
|
2011-06-17 15:59:18 +02:00
|
|
|
int v;
|
|
|
|
|
|
|
|
|
|
k = safe_atoi(vtnr, &v);
|
|
|
|
|
if (k >= 0 && v >= 1)
|
|
|
|
|
s->vtnr = v;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
if (leader) {
|
2012-04-16 16:47:33 +02:00
|
|
|
k = parse_pid(leader, &s->leader);
|
|
|
|
|
if (k >= 0)
|
|
|
|
|
audit_session_from_pid(s->leader, &s->audit_id);
|
2011-06-17 15:59:18 +02:00
|
|
|
}
|
|
|
|
|
|
2011-06-24 23:50:39 +02:00
|
|
|
if (type) {
|
|
|
|
|
SessionType t;
|
|
|
|
|
|
|
|
|
|
t = session_type_from_string(type);
|
|
|
|
|
if (t >= 0)
|
|
|
|
|
s->type = t;
|
|
|
|
|
}
|
|
|
|
|
|
2012-02-14 21:33:51 +01:00
|
|
|
if (class) {
|
|
|
|
|
SessionClass c;
|
|
|
|
|
|
|
|
|
|
c = session_class_from_string(class);
|
|
|
|
|
if (c >= 0)
|
|
|
|
|
s->class = c;
|
|
|
|
|
}
|
|
|
|
|
|
2011-06-29 03:48:53 +02:00
|
|
|
if (s->fifo_path) {
|
|
|
|
|
int fd;
|
|
|
|
|
|
|
|
|
|
/* If we open an unopened pipe for reading we will not
|
|
|
|
|
get an EOF. to trigger an EOF we hence open it for
|
|
|
|
|
reading, but close it right-away which then will
|
|
|
|
|
trigger the EOF. */
|
|
|
|
|
|
|
|
|
|
fd = session_create_fifo(s);
|
|
|
|
|
if (fd >= 0)
|
|
|
|
|
close_nointr_nofail(fd);
|
|
|
|
|
}
|
|
|
|
|
|
2013-06-20 03:45:08 +02:00
|
|
|
if (realtime) {
|
|
|
|
|
unsigned long long l;
|
|
|
|
|
if (sscanf(realtime, "%llu", &l) > 0)
|
|
|
|
|
s->timestamp.realtime = l;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
if (monotonic) {
|
|
|
|
|
unsigned long long l;
|
|
|
|
|
if (sscanf(monotonic, "%llu", &l) > 0)
|
|
|
|
|
s->timestamp.monotonic = l;
|
|
|
|
|
}
|
2011-06-17 15:59:18 +02:00
|
|
|
|
|
|
|
|
return r;
|
2011-05-23 23:55:06 +02:00
|
|
|
}
|
|
|
|
|
|
|
|
|
|
int session_activate(Session *s) {
|
2013-09-17 23:40:19 +02:00
|
|
|
unsigned int num_pending;
|
|
|
|
|
|
2011-05-23 23:55:06 +02:00
|
|
|
assert(s);
|
2013-06-20 03:45:08 +02:00
|
|
|
assert(s->user);
|
2011-05-23 23:55:06 +02:00
|
|
|
|
|
|
|
|
if (!s->seat)
|
|
|
|
|
return -ENOTSUP;
|
|
|
|
|
|
|
|
|
|
if (s->seat->active == s)
|
|
|
|
|
return 0;
|
|
|
|
|
|
2013-09-17 23:40:19 +02:00
|
|
|
/* on seats with VTs, we let VTs manage session-switching */
|
|
|
|
|
if (seat_has_vts(s->seat)) {
|
|
|
|
|
if (s->vtnr <= 0)
|
|
|
|
|
return -ENOTSUP;
|
|
|
|
|
|
|
|
|
|
return chvt(s->vtnr);
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
/* On seats without VTs, we implement session-switching in logind. We
|
|
|
|
|
* try to pause all session-devices and wait until the session
|
|
|
|
|
* controller acknowledged them. Once all devices are asleep, we simply
|
|
|
|
|
* switch the active session and be done.
|
|
|
|
|
* We save the session we want to switch to in seat->pending_switch and
|
|
|
|
|
* seat_complete_switch() will perform the final switch. */
|
|
|
|
|
|
|
|
|
|
s->seat->pending_switch = s;
|
|
|
|
|
|
|
|
|
|
/* if no devices are running, immediately perform the session switch */
|
|
|
|
|
num_pending = session_device_try_pause_all(s);
|
|
|
|
|
if (!num_pending)
|
|
|
|
|
seat_complete_switch(s->seat);
|
2011-05-23 23:55:06 +02:00
|
|
|
|
2013-09-17 23:40:19 +02:00
|
|
|
return 0;
|
2011-05-23 23:55:06 +02:00
|
|
|
}
|
|
|
|
|
|
|
|
|
|
static int session_link_x11_socket(Session *s) {
|
2013-08-25 05:48:34 +02:00
|
|
|
_cleanup_free_ char *t = NULL, *f = NULL;
|
|
|
|
|
char *c;
|
2011-05-23 23:55:06 +02:00
|
|
|
size_t k;
|
|
|
|
|
|
|
|
|
|
assert(s);
|
|
|
|
|
assert(s->user);
|
|
|
|
|
assert(s->user->runtime_path);
|
|
|
|
|
|
|
|
|
|
if (s->user->display)
|
|
|
|
|
return 0;
|
|
|
|
|
|
2011-06-27 22:44:12 +02:00
|
|
|
if (!s->display || !display_is_local(s->display))
|
2011-05-23 23:55:06 +02:00
|
|
|
return 0;
|
|
|
|
|
|
|
|
|
|
k = strspn(s->display+1, "0123456789");
|
|
|
|
|
f = new(char, sizeof("/tmp/.X11-unix/X") + k);
|
2012-07-25 23:55:59 +02:00
|
|
|
if (!f)
|
|
|
|
|
return log_oom();
|
2011-05-23 23:55:06 +02:00
|
|
|
|
|
|
|
|
c = stpcpy(f, "/tmp/.X11-unix/X");
|
|
|
|
|
memcpy(c, s->display+1, k);
|
|
|
|
|
c[k] = 0;
|
|
|
|
|
|
|
|
|
|
if (access(f, F_OK) < 0) {
|
2012-05-21 15:22:28 +02:00
|
|
|
log_warning("Session %s has display %s with non-existing socket %s.", s->id, s->display, f);
|
2011-05-23 23:55:06 +02:00
|
|
|
return -ENOENT;
|
|
|
|
|
}
|
|
|
|
|
|
2012-03-22 01:43:36 +01:00
|
|
|
/* Note that this cannot be in a subdir to avoid
|
|
|
|
|
* vulnerabilities since we are privileged but the runtime
|
|
|
|
|
* path is owned by the user */
|
|
|
|
|
|
2012-01-17 14:03:00 +01:00
|
|
|
t = strappend(s->user->runtime_path, "/X11-display");
|
2013-08-25 05:48:34 +02:00
|
|
|
if (!t)
|
2012-07-25 23:55:59 +02:00
|
|
|
return log_oom();
|
2011-05-23 23:55:06 +02:00
|
|
|
|
|
|
|
|
if (link(f, t) < 0) {
|
|
|
|
|
if (errno == EEXIST) {
|
|
|
|
|
unlink(t);
|
|
|
|
|
|
|
|
|
|
if (link(f, t) >= 0)
|
|
|
|
|
goto done;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
if (symlink(f, t) < 0) {
|
|
|
|
|
|
|
|
|
|
if (errno == EEXIST) {
|
|
|
|
|
unlink(t);
|
|
|
|
|
|
|
|
|
|
if (symlink(f, t) >= 0)
|
|
|
|
|
goto done;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
log_error("Failed to link %s to %s: %m", f, t);
|
|
|
|
|
return -errno;
|
|
|
|
|
}
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
done:
|
|
|
|
|
log_info("Linked %s to %s.", f, t);
|
|
|
|
|
s->user->display = s;
|
|
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
|
}
|
|
|
|
|
|
2013-07-02 01:46:30 +02:00
|
|
|
static int session_start_scope(Session *s) {
|
|
|
|
|
DBusError error;
|
2011-06-24 18:50:50 +02:00
|
|
|
int r;
|
|
|
|
|
|
|
|
|
|
assert(s);
|
2013-06-20 03:45:08 +02:00
|
|
|
assert(s->user);
|
2013-07-02 01:46:30 +02:00
|
|
|
assert(s->user->slice);
|
2011-06-24 18:50:50 +02:00
|
|
|
|
2013-07-02 01:46:30 +02:00
|
|
|
dbus_error_init(&error);
|
2013-04-23 04:10:13 +02:00
|
|
|
|
2013-07-02 01:46:30 +02:00
|
|
|
if (!s->scope) {
|
2013-07-02 17:17:35 +02:00
|
|
|
_cleanup_free_ char *description = NULL;
|
2013-08-13 17:59:28 +02:00
|
|
|
const char *kill_mode;
|
2013-07-02 17:17:35 +02:00
|
|
|
char *scope, *job;
|
|
|
|
|
|
2013-08-13 17:59:28 +02:00
|
|
|
description = strjoin("Session ", s->id, " of user ", s->user->name, NULL);
|
|
|
|
|
if (!description)
|
|
|
|
|
return log_oom();
|
|
|
|
|
|
2013-07-02 17:17:35 +02:00
|
|
|
scope = strjoin("session-", s->id, ".scope", NULL);
|
|
|
|
|
if (!scope)
|
2013-04-23 04:10:13 +02:00
|
|
|
return log_oom();
|
|
|
|
|
|
2013-08-13 17:59:28 +02:00
|
|
|
kill_mode = manager_shall_kill(s->manager, s->user->name) ? "control-group" : "none";
|
2011-06-24 18:50:50 +02:00
|
|
|
|
2013-08-13 17:59:28 +02:00
|
|
|
r = manager_start_scope(s->manager, scope, s->leader, s->user->slice, description, "systemd-user-sessions.service", kill_mode, &error, &job);
|
2013-07-02 17:17:35 +02:00
|
|
|
if (r < 0) {
|
2013-08-24 16:52:23 +02:00
|
|
|
log_error("Failed to start session scope %s: %s %s",
|
|
|
|
|
scope, bus_error(&error, r), error.name);
|
2013-07-02 17:17:35 +02:00
|
|
|
dbus_error_free(&error);
|
2011-06-29 01:47:55 +02:00
|
|
|
|
2013-07-02 17:17:35 +02:00
|
|
|
free(scope);
|
2013-07-10 23:33:17 +02:00
|
|
|
return r;
|
2013-07-02 17:17:35 +02:00
|
|
|
} else {
|
|
|
|
|
s->scope = scope;
|
|
|
|
|
|
|
|
|
|
free(s->scope_job);
|
|
|
|
|
s->scope_job = job;
|
|
|
|
|
}
|
2011-05-23 23:55:06 +02:00
|
|
|
}
|
|
|
|
|
|
2013-07-02 17:17:35 +02:00
|
|
|
if (s->scope)
|
|
|
|
|
hashmap_put(s->manager->session_units, s->scope, s);
|
|
|
|
|
|
2011-05-23 23:55:06 +02:00
|
|
|
return 0;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
int session_start(Session *s) {
|
|
|
|
|
int r;
|
|
|
|
|
|
|
|
|
|
assert(s);
|
2013-06-20 03:45:08 +02:00
|
|
|
|
|
|
|
|
if (!s->user)
|
|
|
|
|
return -ESTALE;
|
2011-05-23 23:55:06 +02:00
|
|
|
|
2011-06-21 21:46:13 +02:00
|
|
|
if (s->started)
|
|
|
|
|
return 0;
|
|
|
|
|
|
2011-06-24 19:42:45 +02:00
|
|
|
r = user_start(s->user);
|
|
|
|
|
if (r < 0)
|
|
|
|
|
return r;
|
|
|
|
|
|
2013-07-02 01:46:30 +02:00
|
|
|
/* Create cgroup */
|
|
|
|
|
r = session_start_scope(s);
|
|
|
|
|
if (r < 0)
|
|
|
|
|
return r;
|
|
|
|
|
|
2012-08-24 22:21:20 +02:00
|
|
|
log_struct(s->type == SESSION_TTY || s->type == SESSION_X11 ? LOG_INFO : LOG_DEBUG,
|
2012-10-08 19:02:30 +02:00
|
|
|
MESSAGE_ID(SD_MESSAGE_SESSION_START),
|
2012-08-24 22:21:20 +02:00
|
|
|
"SESSION_ID=%s", s->id,
|
|
|
|
|
"USER_ID=%s", s->user->name,
|
|
|
|
|
"LEADER=%lu", (unsigned long) s->leader,
|
|
|
|
|
"MESSAGE=New session %s of user %s.", s->id, s->user->name,
|
|
|
|
|
NULL);
|
2011-06-24 18:50:50 +02:00
|
|
|
|
2011-05-23 23:55:06 +02:00
|
|
|
/* Create X11 symlink */
|
|
|
|
|
session_link_x11_socket(s);
|
2011-05-25 00:55:58 +02:00
|
|
|
|
2013-06-20 03:45:08 +02:00
|
|
|
if (!dual_timestamp_is_set(&s->timestamp))
|
|
|
|
|
dual_timestamp_get(&s->timestamp);
|
2011-05-25 00:55:58 +02:00
|
|
|
|
2011-06-27 23:07:13 +02:00
|
|
|
if (s->seat)
|
|
|
|
|
seat_read_active_vt(s->seat);
|
|
|
|
|
|
2011-06-21 21:46:13 +02:00
|
|
|
s->started = true;
|
|
|
|
|
|
2011-06-27 23:07:13 +02:00
|
|
|
/* Save session data */
|
|
|
|
|
session_save(s);
|
2011-06-28 03:52:22 +02:00
|
|
|
user_save(s->user);
|
2011-06-27 23:07:13 +02:00
|
|
|
|
2011-06-21 20:43:34 +02:00
|
|
|
session_send_signal(s, true);
|
|
|
|
|
|
2011-06-21 21:46:13 +02:00
|
|
|
if (s->seat) {
|
2011-06-28 03:52:22 +02:00
|
|
|
seat_save(s->seat);
|
|
|
|
|
|
2011-06-21 21:46:13 +02:00
|
|
|
if (s->seat->active == s)
|
|
|
|
|
seat_send_changed(s->seat, "Sessions\0ActiveSession\0");
|
|
|
|
|
else
|
|
|
|
|
seat_send_changed(s->seat, "Sessions\0");
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
user_send_changed(s->user, "Sessions\0");
|
|
|
|
|
|
2011-05-23 23:55:06 +02:00
|
|
|
return 0;
|
|
|
|
|
}
|
|
|
|
|
|
2013-07-02 01:46:30 +02:00
|
|
|
static int session_stop_scope(Session *s) {
|
|
|
|
|
DBusError error;
|
|
|
|
|
char *job;
|
2011-05-23 23:55:06 +02:00
|
|
|
int r;
|
|
|
|
|
|
|
|
|
|
assert(s);
|
|
|
|
|
|
2013-07-02 01:46:30 +02:00
|
|
|
dbus_error_init(&error);
|
2011-05-23 23:55:06 +02:00
|
|
|
|
2013-07-02 01:46:30 +02:00
|
|
|
if (!s->scope)
|
|
|
|
|
return 0;
|
2012-01-31 23:51:16 +01:00
|
|
|
|
2013-07-02 01:46:30 +02:00
|
|
|
r = manager_stop_unit(s->manager, s->scope, &error, &job);
|
|
|
|
|
if (r < 0) {
|
|
|
|
|
log_error("Failed to stop session scope: %s", bus_error(&error, r));
|
|
|
|
|
dbus_error_free(&error);
|
|
|
|
|
return r;
|
2011-05-23 23:55:06 +02:00
|
|
|
}
|
|
|
|
|
|
2013-07-02 01:46:30 +02:00
|
|
|
free(s->scope_job);
|
|
|
|
|
s->scope_job = job;
|
2011-05-23 23:55:06 +02:00
|
|
|
|
2012-01-31 23:51:16 +01:00
|
|
|
return 0;
|
2011-05-23 23:55:06 +02:00
|
|
|
}
|
|
|
|
|
|
|
|
|
|
static int session_unlink_x11_socket(Session *s) {
|
2013-08-25 05:48:34 +02:00
|
|
|
_cleanup_free_ char *t = NULL;
|
2011-05-23 23:55:06 +02:00
|
|
|
int r;
|
|
|
|
|
|
|
|
|
|
assert(s);
|
|
|
|
|
assert(s->user);
|
|
|
|
|
|
|
|
|
|
if (s->user->display != s)
|
|
|
|
|
return 0;
|
|
|
|
|
|
|
|
|
|
s->user->display = NULL;
|
|
|
|
|
|
2012-01-17 14:03:00 +01:00
|
|
|
t = strappend(s->user->runtime_path, "/X11-display");
|
2012-07-25 23:55:59 +02:00
|
|
|
if (!t)
|
|
|
|
|
return log_oom();
|
2011-05-23 23:55:06 +02:00
|
|
|
|
|
|
|
|
r = unlink(t);
|
|
|
|
|
return r < 0 ? -errno : 0;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
int session_stop(Session *s) {
|
2013-08-13 17:59:28 +02:00
|
|
|
int r;
|
|
|
|
|
|
|
|
|
|
assert(s);
|
|
|
|
|
|
|
|
|
|
if (!s->user)
|
|
|
|
|
return -ESTALE;
|
|
|
|
|
|
|
|
|
|
/* Kill cgroup */
|
|
|
|
|
r = session_stop_scope(s);
|
|
|
|
|
|
|
|
|
|
session_save(s);
|
|
|
|
|
|
|
|
|
|
return r;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
int session_finalize(Session *s) {
|
|
|
|
|
int r = 0;
|
logind: introduce session-devices
A session-device is a device that is bound to a seat and used by a
session-controller to run the session. This currently includes DRM, fbdev
and evdev devices. A session-device can be created via RequestDevice() on
the dbus API of the session. You can drop it via ReleaseDevice() again.
Once the session is destroyed or you drop control of the session, all
session-devices are automatically destroyed.
Session devices follow the session "active" state. A device can be
active/running or inactive/paused. Whenever a session is not the active
session, no session-device of it can be active. That is, if a session is
not in foreground, all session-devices are paused.
Whenever a session becomes active, all devices are resumed/activated by
logind. If it fails, a device may stay paused.
With every session-device you request, you also get a file-descriptor
back. logind keeps a copy of this fd and uses kernel specific calls to
pause/resume the file-descriptors. For example, a DRM fd is muted
by logind as long as a given session is not active. Hence, the fd of the
application is also muted. Once the session gets active, logind unmutes
the fd and the application will get DRM access again.
This, however, requires kernel support. DRM devices provide DRM-Master for
synchronization, evdev devices have EVIOCREVOKE (pending on
linux-input-ML). fbdev devices do not provide such synchronization methods
(and never will).
Note that for evdev devices, we call EVIOCREVOKE once a session gets
inactive. However, this cannot be undone (the fd is still valid but mostly
unusable). So we reopen a new fd once the session is activated and send it
together with the ResumeDevice() signal.
With this infrastructure in place, compositors can now run without
CAP_SYS_ADMIN (that is, without being root). They use RequestControl() to
acquire a session and listen for devices via udev_monitor. For every
device they want to open, they call RequestDevice() on logind. This
returns a fd which they can use now. They no longer have to open the
devices themselves or call any privileged ioctls. This is all done by
logind.
Session-switches are still bound to VTs. Hence, compositors will get
notified via the usual VT mechanisms and can cleanup their state. Once the
VT switch is acknowledged as usual, logind will get notified via sysfs and
pause the old-session's devices and resume the devices of the new session.
To allow using this infrastructure with systems without VTs, we provide
notification signals. logind sends PauseDevice("force") dbus signals to
the current session controller for every device that it pauses. And it
sends ResumeDevice signals for every device that it resumes. For
seats with VTs this is sent _after_ the VT switch is acknowledged. Because
the compositor already acknowledged that it cleaned-up all devices.
However, for seats without VTs, this is used to notify the active
compositor that the session is about to be deactivated. That is, logind
sends PauseDevice("force") for each active device and then performs the
session-switch. The session-switch changes the "Active" property of the
session which can be monitored by the compositor. The new session is
activated and the ResumeDevice events are sent.
For seats without VTs, this is a forced session-switch. As this is not
backwards-compatible (xserver actually crashes, weston drops the related
devices, ..) we also provide an acknowledged session-switch. Note that
this is never used for sessions with VTs. You use the acknowledged
VT-switch on these seats.
An acknowledged session switch sends PauseDevice("pause") instead of
PauseDevice("force") to the active session. It schedules a short timeout
and waits for the session to acknowledge each of them with
PauseDeviceComplete(). Once all are acknowledged, or the session ran out
of time, a PauseDevice("force") is sent for all remaining active devices
and the session switch is performed.
Note that this is only partially implemented, yet, as we don't allow
multi-session without VTs, yet. A follow up commit will hook it up and
implemented the acknowledgements+timeout.
The implementation is quite simple. We use major/minor exclusively to
identify devices on the bus. On RequestDevice() we retrieve the
udev_device from the major/minor and search for an existing "Device"
object. If no exists, we create it. This guarantees us that we are
notified whenever the device changes seats or is removed.
We create a new SessionDevice object and link it to the related Session
and Device. Session->devices is a hashtable to lookup SessionDevice
objects via major/minor. Device->session_devices is a linked list so we
can release all linked session-devices once a device vanishes.
Now we only have to hook this up in seat_set_active() so we correctly
change device states during session-switches. As mentioned earlier, these
are forced state-changes as VTs are currently used exclusively for
multi-session implementations.
Everything else are hooks to release all session-devices once the
controller changes or a session is closed or removed.
2013-09-17 23:39:04 +02:00
|
|
|
SessionDevice *sd;
|
2011-05-23 23:55:06 +02:00
|
|
|
|
|
|
|
|
assert(s);
|
|
|
|
|
|
2013-06-20 03:45:08 +02:00
|
|
|
if (!s->user)
|
|
|
|
|
return -ESTALE;
|
|
|
|
|
|
2011-06-24 19:42:45 +02:00
|
|
|
if (s->started)
|
2012-08-24 22:21:20 +02:00
|
|
|
log_struct(s->type == SESSION_TTY || s->type == SESSION_X11 ? LOG_INFO : LOG_DEBUG,
|
2012-10-08 19:02:30 +02:00
|
|
|
MESSAGE_ID(SD_MESSAGE_SESSION_STOP),
|
2012-08-24 22:21:20 +02:00
|
|
|
"SESSION_ID=%s", s->id,
|
|
|
|
|
"USER_ID=%s", s->user->name,
|
|
|
|
|
"LEADER=%lu", (unsigned long) s->leader,
|
|
|
|
|
"MESSAGE=Removed session %s.", s->id,
|
|
|
|
|
NULL);
|
2011-06-24 18:50:50 +02:00
|
|
|
|
logind: introduce session-devices
A session-device is a device that is bound to a seat and used by a
session-controller to run the session. This currently includes DRM, fbdev
and evdev devices. A session-device can be created via RequestDevice() on
the dbus API of the session. You can drop it via ReleaseDevice() again.
Once the session is destroyed or you drop control of the session, all
session-devices are automatically destroyed.
Session devices follow the session "active" state. A device can be
active/running or inactive/paused. Whenever a session is not the active
session, no session-device of it can be active. That is, if a session is
not in foreground, all session-devices are paused.
Whenever a session becomes active, all devices are resumed/activated by
logind. If it fails, a device may stay paused.
With every session-device you request, you also get a file-descriptor
back. logind keeps a copy of this fd and uses kernel specific calls to
pause/resume the file-descriptors. For example, a DRM fd is muted
by logind as long as a given session is not active. Hence, the fd of the
application is also muted. Once the session gets active, logind unmutes
the fd and the application will get DRM access again.
This, however, requires kernel support. DRM devices provide DRM-Master for
synchronization, evdev devices have EVIOCREVOKE (pending on
linux-input-ML). fbdev devices do not provide such synchronization methods
(and never will).
Note that for evdev devices, we call EVIOCREVOKE once a session gets
inactive. However, this cannot be undone (the fd is still valid but mostly
unusable). So we reopen a new fd once the session is activated and send it
together with the ResumeDevice() signal.
With this infrastructure in place, compositors can now run without
CAP_SYS_ADMIN (that is, without being root). They use RequestControl() to
acquire a session and listen for devices via udev_monitor. For every
device they want to open, they call RequestDevice() on logind. This
returns a fd which they can use now. They no longer have to open the
devices themselves or call any privileged ioctls. This is all done by
logind.
Session-switches are still bound to VTs. Hence, compositors will get
notified via the usual VT mechanisms and can cleanup their state. Once the
VT switch is acknowledged as usual, logind will get notified via sysfs and
pause the old-session's devices and resume the devices of the new session.
To allow using this infrastructure with systems without VTs, we provide
notification signals. logind sends PauseDevice("force") dbus signals to
the current session controller for every device that it pauses. And it
sends ResumeDevice signals for every device that it resumes. For
seats with VTs this is sent _after_ the VT switch is acknowledged. Because
the compositor already acknowledged that it cleaned-up all devices.
However, for seats without VTs, this is used to notify the active
compositor that the session is about to be deactivated. That is, logind
sends PauseDevice("force") for each active device and then performs the
session-switch. The session-switch changes the "Active" property of the
session which can be monitored by the compositor. The new session is
activated and the ResumeDevice events are sent.
For seats without VTs, this is a forced session-switch. As this is not
backwards-compatible (xserver actually crashes, weston drops the related
devices, ..) we also provide an acknowledged session-switch. Note that
this is never used for sessions with VTs. You use the acknowledged
VT-switch on these seats.
An acknowledged session switch sends PauseDevice("pause") instead of
PauseDevice("force") to the active session. It schedules a short timeout
and waits for the session to acknowledge each of them with
PauseDeviceComplete(). Once all are acknowledged, or the session ran out
of time, a PauseDevice("force") is sent for all remaining active devices
and the session switch is performed.
Note that this is only partially implemented, yet, as we don't allow
multi-session without VTs, yet. A follow up commit will hook it up and
implemented the acknowledgements+timeout.
The implementation is quite simple. We use major/minor exclusively to
identify devices on the bus. On RequestDevice() we retrieve the
udev_device from the major/minor and search for an existing "Device"
object. If no exists, we create it. This guarantees us that we are
notified whenever the device changes seats or is removed.
We create a new SessionDevice object and link it to the related Session
and Device. Session->devices is a hashtable to lookup SessionDevice
objects via major/minor. Device->session_devices is a linked list so we
can release all linked session-devices once a device vanishes.
Now we only have to hook this up in seat_set_active() so we correctly
change device states during session-switches. As mentioned earlier, these
are forced state-changes as VTs are currently used exclusively for
multi-session implementations.
Everything else are hooks to release all session-devices once the
controller changes or a session is closed or removed.
2013-09-17 23:39:04 +02:00
|
|
|
/* Kill session devices */
|
|
|
|
|
while ((sd = hashmap_first(s->devices)))
|
|
|
|
|
session_device_free(sd);
|
|
|
|
|
|
2011-05-23 23:55:06 +02:00
|
|
|
/* Remove X11 symlink */
|
|
|
|
|
session_unlink_x11_socket(s);
|
|
|
|
|
|
2011-05-25 00:58:55 +02:00
|
|
|
unlink(s->state_file);
|
|
|
|
|
session_add_to_gc_queue(s);
|
2011-06-24 19:42:45 +02:00
|
|
|
user_add_to_gc_queue(s->user);
|
2011-05-25 00:55:58 +02:00
|
|
|
|
2013-08-13 17:59:28 +02:00
|
|
|
if (s->started) {
|
2011-06-24 19:42:45 +02:00
|
|
|
session_send_signal(s, false);
|
2013-08-13 17:59:28 +02:00
|
|
|
s->started = false;
|
|
|
|
|
}
|
2013-04-10 09:49:24 +02:00
|
|
|
|
2011-06-21 21:46:13 +02:00
|
|
|
if (s->seat) {
|
|
|
|
|
if (s->seat->active == s)
|
|
|
|
|
seat_set_active(s->seat, NULL);
|
|
|
|
|
|
|
|
|
|
seat_send_changed(s->seat, "Sessions\0");
|
2012-09-04 02:37:27 +02:00
|
|
|
seat_save(s->seat);
|
2011-06-21 21:46:13 +02:00
|
|
|
}
|
|
|
|
|
|
|
|
|
|
user_send_changed(s->user, "Sessions\0");
|
2012-09-04 02:37:27 +02:00
|
|
|
user_save(s->user);
|
2011-06-21 21:46:13 +02:00
|
|
|
|
2011-05-23 23:55:06 +02:00
|
|
|
return r;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
bool session_is_active(Session *s) {
|
|
|
|
|
assert(s);
|
|
|
|
|
|
|
|
|
|
if (!s->seat)
|
|
|
|
|
return true;
|
|
|
|
|
|
|
|
|
|
return s->seat->active == s;
|
|
|
|
|
}
|
|
|
|
|
|
2012-12-23 22:32:48 +01:00
|
|
|
static int get_tty_atime(const char *tty, usec_t *atime) {
|
|
|
|
|
_cleanup_free_ char *p = NULL;
|
2011-06-17 15:59:18 +02:00
|
|
|
struct stat st;
|
2012-12-23 22:32:48 +01:00
|
|
|
|
|
|
|
|
assert(tty);
|
|
|
|
|
assert(atime);
|
|
|
|
|
|
|
|
|
|
if (!path_is_absolute(tty)) {
|
|
|
|
|
p = strappend("/dev/", tty);
|
|
|
|
|
if (!p)
|
|
|
|
|
return -ENOMEM;
|
|
|
|
|
|
|
|
|
|
tty = p;
|
|
|
|
|
} else if (!path_startswith(tty, "/dev/"))
|
|
|
|
|
return -ENOENT;
|
|
|
|
|
|
|
|
|
|
if (lstat(tty, &st) < 0)
|
|
|
|
|
return -errno;
|
|
|
|
|
|
|
|
|
|
*atime = timespec_load(&st.st_atim);
|
|
|
|
|
return 0;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
static int get_process_ctty_atime(pid_t pid, usec_t *atime) {
|
|
|
|
|
_cleanup_free_ char *p = NULL;
|
|
|
|
|
int r;
|
|
|
|
|
|
|
|
|
|
assert(pid > 0);
|
|
|
|
|
assert(atime);
|
|
|
|
|
|
|
|
|
|
r = get_ctty(pid, NULL, &p);
|
|
|
|
|
if (r < 0)
|
|
|
|
|
return r;
|
|
|
|
|
|
|
|
|
|
return get_tty_atime(p, atime);
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
int session_get_idle_hint(Session *s, dual_timestamp *t) {
|
|
|
|
|
usec_t atime = 0, n;
|
|
|
|
|
int r;
|
2011-06-17 15:59:18 +02:00
|
|
|
|
|
|
|
|
assert(s);
|
|
|
|
|
|
2012-12-23 22:32:48 +01:00
|
|
|
/* Explicit idle hint is set */
|
2011-06-17 15:59:18 +02:00
|
|
|
if (s->idle_hint) {
|
|
|
|
|
if (t)
|
|
|
|
|
*t = s->idle_hint_timestamp;
|
|
|
|
|
|
|
|
|
|
return s->idle_hint;
|
|
|
|
|
}
|
|
|
|
|
|
2013-01-11 17:06:23 +01:00
|
|
|
/* Graphical sessions should really implement a real
|
2012-12-23 22:32:48 +01:00
|
|
|
* idle hint logic */
|
|
|
|
|
if (s->display)
|
2011-06-17 15:59:18 +02:00
|
|
|
goto dont_know;
|
|
|
|
|
|
2012-12-23 22:32:48 +01:00
|
|
|
/* For sessions with an explicitly configured tty, let's check
|
|
|
|
|
* its atime */
|
|
|
|
|
if (s->tty) {
|
|
|
|
|
r = get_tty_atime(s->tty, &atime);
|
|
|
|
|
if (r >= 0)
|
|
|
|
|
goto found_atime;
|
|
|
|
|
}
|
2011-06-17 15:59:18 +02:00
|
|
|
|
2012-12-23 22:32:48 +01:00
|
|
|
/* For sessions with a leader but no explicitly configured
|
|
|
|
|
* tty, let's check the controlling tty of the leader */
|
|
|
|
|
if (s->leader > 0) {
|
|
|
|
|
r = get_process_ctty_atime(s->leader, &atime);
|
|
|
|
|
if (r >= 0)
|
|
|
|
|
goto found_atime;
|
2011-06-17 15:59:18 +02:00
|
|
|
}
|
|
|
|
|
|
|
|
|
|
dont_know:
|
|
|
|
|
if (t)
|
|
|
|
|
*t = s->idle_hint_timestamp;
|
|
|
|
|
|
|
|
|
|
return 0;
|
2012-12-23 22:32:48 +01:00
|
|
|
|
|
|
|
|
found_atime:
|
|
|
|
|
if (t)
|
|
|
|
|
dual_timestamp_from_realtime(t, atime);
|
|
|
|
|
|
|
|
|
|
n = now(CLOCK_REALTIME);
|
|
|
|
|
|
|
|
|
|
if (s->manager->idle_action_usec <= 0)
|
|
|
|
|
return 0;
|
|
|
|
|
|
|
|
|
|
return atime + s->manager->idle_action_usec <= n;
|
2011-06-17 15:59:18 +02:00
|
|
|
}
|
|
|
|
|
|
2011-06-21 19:20:05 +02:00
|
|
|
void session_set_idle_hint(Session *s, bool b) {
|
|
|
|
|
assert(s);
|
|
|
|
|
|
|
|
|
|
if (s->idle_hint == b)
|
|
|
|
|
return;
|
|
|
|
|
|
|
|
|
|
s->idle_hint = b;
|
|
|
|
|
dual_timestamp_get(&s->idle_hint_timestamp);
|
2011-06-21 21:46:13 +02:00
|
|
|
|
|
|
|
|
session_send_changed(s,
|
|
|
|
|
"IdleHint\0"
|
|
|
|
|
"IdleSinceHint\0"
|
|
|
|
|
"IdleSinceHintMonotonic\0");
|
|
|
|
|
|
|
|
|
|
if (s->seat)
|
|
|
|
|
seat_send_changed(s->seat,
|
|
|
|
|
"IdleHint\0"
|
|
|
|
|
"IdleSinceHint\0"
|
|
|
|
|
"IdleSinceHintMonotonic\0");
|
|
|
|
|
|
|
|
|
|
user_send_changed(s->user,
|
|
|
|
|
"IdleHint\0"
|
|
|
|
|
"IdleSinceHint\0"
|
|
|
|
|
"IdleSinceHintMonotonic\0");
|
|
|
|
|
|
|
|
|
|
manager_send_changed(s->manager,
|
|
|
|
|
"IdleHint\0"
|
|
|
|
|
"IdleSinceHint\0"
|
|
|
|
|
"IdleSinceHintMonotonic\0");
|
2011-06-21 19:20:05 +02:00
|
|
|
}
|
|
|
|
|
|
2011-06-29 00:06:04 +02:00
|
|
|
int session_create_fifo(Session *s) {
|
|
|
|
|
int r;
|
|
|
|
|
|
2011-06-24 23:25:28 +02:00
|
|
|
assert(s);
|
|
|
|
|
|
2011-06-29 03:48:53 +02:00
|
|
|
/* Create FIFO */
|
2011-06-29 00:06:04 +02:00
|
|
|
if (!s->fifo_path) {
|
2012-05-31 12:40:20 +02:00
|
|
|
r = mkdir_safe_label("/run/systemd/sessions", 0755, 0, 0);
|
2011-06-30 02:16:07 +02:00
|
|
|
if (r < 0)
|
|
|
|
|
return r;
|
|
|
|
|
|
2011-06-29 00:06:04 +02:00
|
|
|
if (asprintf(&s->fifo_path, "/run/systemd/sessions/%s.ref", s->id) < 0)
|
|
|
|
|
return -ENOMEM;
|
2011-06-24 23:25:28 +02:00
|
|
|
|
2011-06-29 00:06:04 +02:00
|
|
|
if (mkfifo(s->fifo_path, 0600) < 0 && errno != EEXIST)
|
|
|
|
|
return -errno;
|
|
|
|
|
}
|
2011-06-24 23:25:28 +02:00
|
|
|
|
2011-06-29 00:06:04 +02:00
|
|
|
/* Open reading side */
|
2011-06-29 03:48:53 +02:00
|
|
|
if (s->fifo_fd < 0) {
|
2013-03-25 00:59:00 +01:00
|
|
|
struct epoll_event ev = {};
|
2011-06-29 03:48:53 +02:00
|
|
|
|
|
|
|
|
s->fifo_fd = open(s->fifo_path, O_RDONLY|O_CLOEXEC|O_NDELAY);
|
|
|
|
|
if (s->fifo_fd < 0)
|
|
|
|
|
return -errno;
|
|
|
|
|
|
2012-04-16 16:47:33 +02:00
|
|
|
r = hashmap_put(s->manager->session_fds, INT_TO_PTR(s->fifo_fd + 1), s);
|
2011-06-29 03:48:53 +02:00
|
|
|
if (r < 0)
|
|
|
|
|
return r;
|
|
|
|
|
|
|
|
|
|
ev.events = 0;
|
2012-05-30 15:01:51 +02:00
|
|
|
ev.data.u32 = FD_OTHER_BASE + s->fifo_fd;
|
2011-06-29 03:48:53 +02:00
|
|
|
|
|
|
|
|
if (epoll_ctl(s->manager->epoll_fd, EPOLL_CTL_ADD, s->fifo_fd, &ev) < 0)
|
|
|
|
|
return -errno;
|
|
|
|
|
}
|
2011-06-29 00:06:04 +02:00
|
|
|
|
|
|
|
|
/* Open writing side */
|
|
|
|
|
r = open(s->fifo_path, O_WRONLY|O_CLOEXEC|O_NDELAY);
|
|
|
|
|
if (r < 0)
|
|
|
|
|
return -errno;
|
2011-06-24 23:25:28 +02:00
|
|
|
|
2011-06-29 00:06:04 +02:00
|
|
|
return r;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
void session_remove_fifo(Session *s) {
|
|
|
|
|
assert(s);
|
|
|
|
|
|
|
|
|
|
if (s->fifo_fd >= 0) {
|
2012-04-16 16:47:33 +02:00
|
|
|
assert_se(hashmap_remove(s->manager->session_fds, INT_TO_PTR(s->fifo_fd + 1)) == s);
|
2011-06-29 00:06:04 +02:00
|
|
|
assert_se(epoll_ctl(s->manager->epoll_fd, EPOLL_CTL_DEL, s->fifo_fd, NULL) == 0);
|
|
|
|
|
close_nointr_nofail(s->fifo_fd);
|
|
|
|
|
s->fifo_fd = -1;
|
2012-09-04 02:37:27 +02:00
|
|
|
|
|
|
|
|
session_save(s);
|
|
|
|
|
user_save(s->user);
|
2011-06-29 00:06:04 +02:00
|
|
|
}
|
|
|
|
|
|
|
|
|
|
if (s->fifo_path) {
|
|
|
|
|
unlink(s->fifo_path);
|
|
|
|
|
free(s->fifo_path);
|
|
|
|
|
s->fifo_path = NULL;
|
|
|
|
|
}
|
2011-06-24 23:25:28 +02:00
|
|
|
}
|
|
|
|
|
|
2011-06-29 03:48:16 +02:00
|
|
|
int session_check_gc(Session *s, bool drop_not_started) {
|
2011-05-23 23:55:06 +02:00
|
|
|
int r;
|
|
|
|
|
|
|
|
|
|
assert(s);
|
|
|
|
|
|
2011-06-29 03:48:16 +02:00
|
|
|
if (drop_not_started && !s->started)
|
2011-06-29 00:06:04 +02:00
|
|
|
return 0;
|
|
|
|
|
|
2013-06-20 03:45:08 +02:00
|
|
|
if (!s->user)
|
|
|
|
|
return 0;
|
|
|
|
|
|
2011-06-29 00:06:04 +02:00
|
|
|
if (s->fifo_fd >= 0) {
|
|
|
|
|
r = pipe_eof(s->fifo_fd);
|
2011-05-23 23:55:06 +02:00
|
|
|
if (r < 0)
|
|
|
|
|
return r;
|
|
|
|
|
|
2011-05-25 00:55:58 +02:00
|
|
|
if (r == 0)
|
2011-05-23 23:55:06 +02:00
|
|
|
return 1;
|
|
|
|
|
}
|
|
|
|
|
|
2013-07-02 01:46:30 +02:00
|
|
|
if (s->scope_job)
|
|
|
|
|
return 1;
|
2011-05-23 23:55:06 +02:00
|
|
|
|
2013-07-02 01:46:30 +02:00
|
|
|
if (s->scope)
|
|
|
|
|
return manager_unit_is_active(s->manager, s->scope) != 0;
|
2011-05-23 23:55:06 +02:00
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
|
}
|
|
|
|
|
|
2011-05-25 00:55:58 +02:00
|
|
|
void session_add_to_gc_queue(Session *s) {
|
|
|
|
|
assert(s);
|
|
|
|
|
|
|
|
|
|
if (s->in_gc_queue)
|
|
|
|
|
return;
|
|
|
|
|
|
|
|
|
|
LIST_PREPEND(Session, gc_queue, s->manager->session_gc_queue, s);
|
|
|
|
|
s->in_gc_queue = true;
|
|
|
|
|
}
|
|
|
|
|
|
2012-06-21 16:14:53 +02:00
|
|
|
SessionState session_get_state(Session *s) {
|
|
|
|
|
assert(s);
|
|
|
|
|
|
2013-08-13 17:59:28 +02:00
|
|
|
if (s->closing)
|
|
|
|
|
return SESSION_CLOSING;
|
|
|
|
|
|
2013-07-02 01:46:30 +02:00
|
|
|
if (s->scope_job)
|
2013-08-13 17:59:28 +02:00
|
|
|
return SESSION_OPENING;
|
2013-07-02 01:46:30 +02:00
|
|
|
|
2012-06-21 16:14:53 +02:00
|
|
|
if (s->fifo_fd < 0)
|
|
|
|
|
return SESSION_CLOSING;
|
|
|
|
|
|
|
|
|
|
if (session_is_active(s))
|
|
|
|
|
return SESSION_ACTIVE;
|
|
|
|
|
|
|
|
|
|
return SESSION_ONLINE;
|
|
|
|
|
}
|
|
|
|
|
|
2011-07-13 19:58:35 +02:00
|
|
|
int session_kill(Session *s, KillWho who, int signo) {
|
|
|
|
|
assert(s);
|
|
|
|
|
|
2013-07-02 01:46:30 +02:00
|
|
|
if (!s->scope)
|
2011-07-13 19:58:35 +02:00
|
|
|
return -ESRCH;
|
|
|
|
|
|
2013-07-02 01:46:30 +02:00
|
|
|
return manager_kill_unit(s->manager, s->scope, who, signo, NULL);
|
2011-07-13 19:58:35 +02:00
|
|
|
}
|
|
|
|
|
|
2013-09-17 17:39:56 +02:00
|
|
|
bool session_is_controller(Session *s, const char *sender)
|
|
|
|
|
{
|
|
|
|
|
assert(s);
|
|
|
|
|
|
|
|
|
|
return streq_ptr(s->controller, sender);
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
int session_set_controller(Session *s, const char *sender, bool force) {
|
|
|
|
|
char *t;
|
|
|
|
|
int r;
|
|
|
|
|
|
|
|
|
|
assert(s);
|
|
|
|
|
assert(sender);
|
|
|
|
|
|
|
|
|
|
if (session_is_controller(s, sender))
|
|
|
|
|
return 0;
|
|
|
|
|
if (s->controller && !force)
|
|
|
|
|
return -EBUSY;
|
|
|
|
|
|
|
|
|
|
t = strdup(sender);
|
|
|
|
|
if (!t)
|
|
|
|
|
return -ENOMEM;
|
|
|
|
|
|
|
|
|
|
r = manager_watch_busname(s->manager, sender);
|
|
|
|
|
if (r) {
|
|
|
|
|
free(t);
|
|
|
|
|
return r;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
session_drop_controller(s);
|
|
|
|
|
|
|
|
|
|
s->controller = t;
|
|
|
|
|
return 0;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
void session_drop_controller(Session *s) {
|
logind: introduce session-devices
A session-device is a device that is bound to a seat and used by a
session-controller to run the session. This currently includes DRM, fbdev
and evdev devices. A session-device can be created via RequestDevice() on
the dbus API of the session. You can drop it via ReleaseDevice() again.
Once the session is destroyed or you drop control of the session, all
session-devices are automatically destroyed.
Session devices follow the session "active" state. A device can be
active/running or inactive/paused. Whenever a session is not the active
session, no session-device of it can be active. That is, if a session is
not in foreground, all session-devices are paused.
Whenever a session becomes active, all devices are resumed/activated by
logind. If it fails, a device may stay paused.
With every session-device you request, you also get a file-descriptor
back. logind keeps a copy of this fd and uses kernel specific calls to
pause/resume the file-descriptors. For example, a DRM fd is muted
by logind as long as a given session is not active. Hence, the fd of the
application is also muted. Once the session gets active, logind unmutes
the fd and the application will get DRM access again.
This, however, requires kernel support. DRM devices provide DRM-Master for
synchronization, evdev devices have EVIOCREVOKE (pending on
linux-input-ML). fbdev devices do not provide such synchronization methods
(and never will).
Note that for evdev devices, we call EVIOCREVOKE once a session gets
inactive. However, this cannot be undone (the fd is still valid but mostly
unusable). So we reopen a new fd once the session is activated and send it
together with the ResumeDevice() signal.
With this infrastructure in place, compositors can now run without
CAP_SYS_ADMIN (that is, without being root). They use RequestControl() to
acquire a session and listen for devices via udev_monitor. For every
device they want to open, they call RequestDevice() on logind. This
returns a fd which they can use now. They no longer have to open the
devices themselves or call any privileged ioctls. This is all done by
logind.
Session-switches are still bound to VTs. Hence, compositors will get
notified via the usual VT mechanisms and can cleanup their state. Once the
VT switch is acknowledged as usual, logind will get notified via sysfs and
pause the old-session's devices and resume the devices of the new session.
To allow using this infrastructure with systems without VTs, we provide
notification signals. logind sends PauseDevice("force") dbus signals to
the current session controller for every device that it pauses. And it
sends ResumeDevice signals for every device that it resumes. For
seats with VTs this is sent _after_ the VT switch is acknowledged. Because
the compositor already acknowledged that it cleaned-up all devices.
However, for seats without VTs, this is used to notify the active
compositor that the session is about to be deactivated. That is, logind
sends PauseDevice("force") for each active device and then performs the
session-switch. The session-switch changes the "Active" property of the
session which can be monitored by the compositor. The new session is
activated and the ResumeDevice events are sent.
For seats without VTs, this is a forced session-switch. As this is not
backwards-compatible (xserver actually crashes, weston drops the related
devices, ..) we also provide an acknowledged session-switch. Note that
this is never used for sessions with VTs. You use the acknowledged
VT-switch on these seats.
An acknowledged session switch sends PauseDevice("pause") instead of
PauseDevice("force") to the active session. It schedules a short timeout
and waits for the session to acknowledge each of them with
PauseDeviceComplete(). Once all are acknowledged, or the session ran out
of time, a PauseDevice("force") is sent for all remaining active devices
and the session switch is performed.
Note that this is only partially implemented, yet, as we don't allow
multi-session without VTs, yet. A follow up commit will hook it up and
implemented the acknowledgements+timeout.
The implementation is quite simple. We use major/minor exclusively to
identify devices on the bus. On RequestDevice() we retrieve the
udev_device from the major/minor and search for an existing "Device"
object. If no exists, we create it. This guarantees us that we are
notified whenever the device changes seats or is removed.
We create a new SessionDevice object and link it to the related Session
and Device. Session->devices is a hashtable to lookup SessionDevice
objects via major/minor. Device->session_devices is a linked list so we
can release all linked session-devices once a device vanishes.
Now we only have to hook this up in seat_set_active() so we correctly
change device states during session-switches. As mentioned earlier, these
are forced state-changes as VTs are currently used exclusively for
multi-session implementations.
Everything else are hooks to release all session-devices once the
controller changes or a session is closed or removed.
2013-09-17 23:39:04 +02:00
|
|
|
SessionDevice *sd;
|
|
|
|
|
|
2013-09-17 17:39:56 +02:00
|
|
|
assert(s);
|
|
|
|
|
|
|
|
|
|
if (!s->controller)
|
|
|
|
|
return;
|
|
|
|
|
|
|
|
|
|
manager_drop_busname(s->manager, s->controller);
|
|
|
|
|
free(s->controller);
|
|
|
|
|
s->controller = NULL;
|
logind: introduce session-devices
A session-device is a device that is bound to a seat and used by a
session-controller to run the session. This currently includes DRM, fbdev
and evdev devices. A session-device can be created via RequestDevice() on
the dbus API of the session. You can drop it via ReleaseDevice() again.
Once the session is destroyed or you drop control of the session, all
session-devices are automatically destroyed.
Session devices follow the session "active" state. A device can be
active/running or inactive/paused. Whenever a session is not the active
session, no session-device of it can be active. That is, if a session is
not in foreground, all session-devices are paused.
Whenever a session becomes active, all devices are resumed/activated by
logind. If it fails, a device may stay paused.
With every session-device you request, you also get a file-descriptor
back. logind keeps a copy of this fd and uses kernel specific calls to
pause/resume the file-descriptors. For example, a DRM fd is muted
by logind as long as a given session is not active. Hence, the fd of the
application is also muted. Once the session gets active, logind unmutes
the fd and the application will get DRM access again.
This, however, requires kernel support. DRM devices provide DRM-Master for
synchronization, evdev devices have EVIOCREVOKE (pending on
linux-input-ML). fbdev devices do not provide such synchronization methods
(and never will).
Note that for evdev devices, we call EVIOCREVOKE once a session gets
inactive. However, this cannot be undone (the fd is still valid but mostly
unusable). So we reopen a new fd once the session is activated and send it
together with the ResumeDevice() signal.
With this infrastructure in place, compositors can now run without
CAP_SYS_ADMIN (that is, without being root). They use RequestControl() to
acquire a session and listen for devices via udev_monitor. For every
device they want to open, they call RequestDevice() on logind. This
returns a fd which they can use now. They no longer have to open the
devices themselves or call any privileged ioctls. This is all done by
logind.
Session-switches are still bound to VTs. Hence, compositors will get
notified via the usual VT mechanisms and can cleanup their state. Once the
VT switch is acknowledged as usual, logind will get notified via sysfs and
pause the old-session's devices and resume the devices of the new session.
To allow using this infrastructure with systems without VTs, we provide
notification signals. logind sends PauseDevice("force") dbus signals to
the current session controller for every device that it pauses. And it
sends ResumeDevice signals for every device that it resumes. For
seats with VTs this is sent _after_ the VT switch is acknowledged. Because
the compositor already acknowledged that it cleaned-up all devices.
However, for seats without VTs, this is used to notify the active
compositor that the session is about to be deactivated. That is, logind
sends PauseDevice("force") for each active device and then performs the
session-switch. The session-switch changes the "Active" property of the
session which can be monitored by the compositor. The new session is
activated and the ResumeDevice events are sent.
For seats without VTs, this is a forced session-switch. As this is not
backwards-compatible (xserver actually crashes, weston drops the related
devices, ..) we also provide an acknowledged session-switch. Note that
this is never used for sessions with VTs. You use the acknowledged
VT-switch on these seats.
An acknowledged session switch sends PauseDevice("pause") instead of
PauseDevice("force") to the active session. It schedules a short timeout
and waits for the session to acknowledge each of them with
PauseDeviceComplete(). Once all are acknowledged, or the session ran out
of time, a PauseDevice("force") is sent for all remaining active devices
and the session switch is performed.
Note that this is only partially implemented, yet, as we don't allow
multi-session without VTs, yet. A follow up commit will hook it up and
implemented the acknowledgements+timeout.
The implementation is quite simple. We use major/minor exclusively to
identify devices on the bus. On RequestDevice() we retrieve the
udev_device from the major/minor and search for an existing "Device"
object. If no exists, we create it. This guarantees us that we are
notified whenever the device changes seats or is removed.
We create a new SessionDevice object and link it to the related Session
and Device. Session->devices is a hashtable to lookup SessionDevice
objects via major/minor. Device->session_devices is a linked list so we
can release all linked session-devices once a device vanishes.
Now we only have to hook this up in seat_set_active() so we correctly
change device states during session-switches. As mentioned earlier, these
are forced state-changes as VTs are currently used exclusively for
multi-session implementations.
Everything else are hooks to release all session-devices once the
controller changes or a session is closed or removed.
2013-09-17 23:39:04 +02:00
|
|
|
|
|
|
|
|
/* Drop all devices as they're now unused. Do that after the controller
|
|
|
|
|
* is released to avoid sending out useles dbus signals. */
|
|
|
|
|
while ((sd = hashmap_first(s->devices)))
|
|
|
|
|
session_device_free(sd);
|
2013-09-17 17:39:56 +02:00
|
|
|
}
|
|
|
|
|
|
2013-07-02 01:46:30 +02:00
|
|
|
static const char* const session_state_table[_SESSION_STATE_MAX] = {
|
|
|
|
|
[SESSION_OPENING] = "opening",
|
2012-06-21 16:14:53 +02:00
|
|
|
[SESSION_ONLINE] = "online",
|
|
|
|
|
[SESSION_ACTIVE] = "active",
|
|
|
|
|
[SESSION_CLOSING] = "closing"
|
|
|
|
|
};
|
|
|
|
|
|
|
|
|
|
DEFINE_STRING_TABLE_LOOKUP(session_state, SessionState);
|
|
|
|
|
|
2011-05-23 23:55:06 +02:00
|
|
|
static const char* const session_type_table[_SESSION_TYPE_MAX] = {
|
2011-05-26 02:21:16 +02:00
|
|
|
[SESSION_TTY] = "tty",
|
2011-06-24 18:50:50 +02:00
|
|
|
[SESSION_X11] = "x11",
|
2011-06-24 23:50:39 +02:00
|
|
|
[SESSION_UNSPECIFIED] = "unspecified"
|
2011-05-23 23:55:06 +02:00
|
|
|
};
|
|
|
|
|
|
|
|
|
|
DEFINE_STRING_TABLE_LOOKUP(session_type, SessionType);
|
2011-07-13 19:58:35 +02:00
|
|
|
|
2012-02-14 21:33:51 +01:00
|
|
|
static const char* const session_class_table[_SESSION_CLASS_MAX] = {
|
|
|
|
|
[SESSION_USER] = "user",
|
|
|
|
|
[SESSION_GREETER] = "greeter",
|
2013-04-09 22:18:16 +02:00
|
|
|
[SESSION_LOCK_SCREEN] = "lock-screen",
|
|
|
|
|
[SESSION_BACKGROUND] = "background"
|
2012-02-14 21:33:51 +01:00
|
|
|
};
|
|
|
|
|
|
|
|
|
|
DEFINE_STRING_TABLE_LOOKUP(session_class, SessionClass);
|
|
|
|
|
|
2011-07-13 19:58:35 +02:00
|
|
|
static const char* const kill_who_table[_KILL_WHO_MAX] = {
|
|
|
|
|
[KILL_LEADER] = "leader",
|
|
|
|
|
[KILL_ALL] = "all"
|
|
|
|
|
};
|
|
|
|
|
|
|
|
|
|
DEFINE_STRING_TABLE_LOOKUP(kill_who, KillWho);
|