X-Git-Url: http://www.chiark.greenend.org.uk/ucgi/~ianmdlvl/git?p=elogind.git;a=blobdiff_plain;f=src%2Flogin%2Flogind-session-device.c;h=b466448948d0e020c48d0aed0633ce8eff51affa;hp=546c53710e08ba9b857028dd926e9110e572023b;hb=d5673993ad3bf38d0aeba8dbd025d6f4527f0169;hpb=c2e5d024a380bae6ead301fb4f40787b372ec3e0
diff --git a/src/login/logind-session-device.c b/src/login/logind-session-device.c
index 546c53710..b46644894 100644
--- a/src/login/logind-session-device.c
+++ b/src/login/logind-session-device.c
@@ -1,5 +1,3 @@
-/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
-
/***
This file is part of systemd.
@@ -19,21 +17,25 @@
along with systemd; If not, see .
***/
-#include
#include
-#include
#include
-#include
#include
#include
-#include
#include
-#include
-#include "dbus-common.h"
+#if 0 /// elogind needs the systems udev header
+#include "libudev.h"
+#else
+#include
+#endif // 0
+
+#include "alloc-util.h"
+#include "bus-util.h"
+#include "fd-util.h"
#include "logind-session-device.h"
-#include "util.h"
#include "missing.h"
+#include "sd-daemon.h"
+#include "util.h"
enum SessionDeviceNotifications {
SESSION_DEVICE_RESUME,
@@ -42,11 +44,12 @@ enum SessionDeviceNotifications {
SESSION_DEVICE_RELEASE,
};
-static void session_device_notify(SessionDevice *sd, enum SessionDeviceNotifications type) {
- _cleanup_dbus_message_unref_ DBusMessage *m = NULL;
+static int session_device_notify(SessionDevice *sd, enum SessionDeviceNotifications type) {
+ _cleanup_(sd_bus_message_unrefp) sd_bus_message *m = NULL;
_cleanup_free_ char *path = NULL;
const char *t = NULL;
uint32_t major, minor;
+ int r;
assert(sd);
@@ -54,29 +57,29 @@ static void session_device_notify(SessionDevice *sd, enum SessionDeviceNotificat
minor = minor(sd->dev);
if (!sd->session->controller)
- return;
+ return 0;
path = session_bus_path(sd->session);
if (!path)
- return;
+ return -ENOMEM;
- m = dbus_message_new_signal(path,
- "org.freedesktop.login1.Session",
- (type == SESSION_DEVICE_RESUME) ? "ResumeDevice" : "PauseDevice");
+ 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;
+ return r;
- if (!dbus_message_set_destination(m, sd->session->controller))
- return;
+ r = sd_bus_message_set_destination(m, sd->session->controller);
+ if (r < 0)
+ return r;
switch (type) {
case SESSION_DEVICE_RESUME:
- if (!dbus_message_append_args(m,
- DBUS_TYPE_UINT32, &major,
- DBUS_TYPE_UINT32, &minor,
- DBUS_TYPE_UNIX_FD, &sd->fd,
- DBUS_TYPE_INVALID))
- return;
+ r = sd_bus_message_append(m, "uuh", major, minor, sd->fd);
+ if (r < 0)
+ return r;
break;
case SESSION_DEVICE_TRY_PAUSE:
t = "pause";
@@ -88,17 +91,16 @@ static void session_device_notify(SessionDevice *sd, enum SessionDeviceNotificat
t = "gone";
break;
default:
- return;
+ return -EINVAL;
}
- if (t && !dbus_message_append_args(m,
- DBUS_TYPE_UINT32, &major,
- DBUS_TYPE_UINT32, &minor,
- DBUS_TYPE_STRING, &t,
- DBUS_TYPE_INVALID))
- return;
+ if (t) {
+ r = sd_bus_message_append(m, "uus", major, minor, t);
+ if (r < 0)
+ return r;
+ }
- dbus_connection_send(sd->session->manager->bus, m, NULL);
+ return sd_bus_send(sd->session->manager->bus, m, NULL);
}
static int sd_eviocrevoke(int fd) {
@@ -107,7 +109,7 @@ static int sd_eviocrevoke(int fd) {
assert(fd >= 0);
- r = ioctl(fd, EVIOCREVOKE, 1);
+ r = ioctl(fd, EVIOCREVOKE, NULL);
if (r < 0) {
r = -errno;
if (r == -EINVAL && !warned) {
@@ -162,7 +164,7 @@ static int session_device_open(SessionDevice *sd, bool active) {
* state. */
r = sd_drmsetmaster(fd);
if (r < 0) {
- close(fd);
+ close_nointr(fd);
return r;
}
} else {
@@ -176,7 +178,6 @@ static int session_device_open(SessionDevice *sd, bool active) {
if (!active)
sd_eviocrevoke(fd);
break;
- case DEVICE_TYPE_FBDEV:
case DEVICE_TYPE_UNKNOWN:
default:
/* fallback for devices wihout synchronizations */
@@ -210,17 +211,12 @@ static int session_device_start(SessionDevice *sd) {
r = session_device_open(sd, true);
if (r < 0)
return r;
- close_nointr_nofail(sd->fd);
+ /* For evdev devices, the file descriptor might be left
+ * uninitialized. This might happen while resuming into a
+ * session and logind has been restarted right before. */
+ safe_close(sd->fd);
sd->fd = r;
break;
- case DEVICE_TYPE_FBDEV:
- /* fbdev devices have no way to synchronize access. Moreover,
- * they mostly operate through mmaps() without any pageflips
- * and modesetting, so there is no way for us to prevent access
- * but tear down mmaps.
- * That would be quite expensive to do on a per-fd context. So
- * ignore legcy fbdev and let its users feel the pain they asked
- * for when deciding for fbdev. */
case DEVICE_TYPE_UNKNOWN:
default:
/* fallback for devices wihout synchronizations */
@@ -252,7 +248,6 @@ static void session_device_stop(SessionDevice *sd) {
* protection this way. */
sd_eviocrevoke(sd->fd);
break;
- case DEVICE_TYPE_FBDEV:
case DEVICE_TYPE_UNKNOWN:
default:
/* fallback for devices without synchronization */
@@ -270,10 +265,7 @@ static DeviceType detect_device_type(struct udev_device *dev) {
subsystem = udev_device_get_subsystem(dev);
type = DEVICE_TYPE_UNKNOWN;
- if (streq_ptr(subsystem, "graphics")) {
- if (!streq(sysname, "fbcon") && startswith(sysname, "fb"))
- type = DEVICE_TYPE_FBDEV;
- } else if (streq_ptr(subsystem, "drm")) {
+ if (streq_ptr(subsystem, "drm")) {
if (startswith(sysname, "card"))
type = DEVICE_TYPE_DRM;
} else if (streq_ptr(subsystem, "input")) {
@@ -314,8 +306,7 @@ static int session_device_verify(SessionDevice *sd) {
goto err_dev;
}
sp = udev_device_get_syspath(dev);
- } else if (sd->type != DEVICE_TYPE_FBDEV &&
- sd->type != DEVICE_TYPE_DRM) {
+ } else if (sd->type != DEVICE_TYPE_DRM) {
/* Prevent opening unsupported devices. Especially devices of
* subsystem "input" must be opened via the evdev node as
* we require EVIOCREVOKE. */
@@ -358,7 +349,7 @@ err_dev:
return r;
}
-int session_device_new(Session *s, dev_t dev, SessionDevice **out) {
+int session_device_new(Session *s, dev_t dev, bool open_device, SessionDevice **out) {
SessionDevice *sd;
int r;
@@ -387,24 +378,26 @@ int session_device_new(Session *s, dev_t dev, SessionDevice **out) {
goto error;
}
- /* Open the device for the first time. We need a valid fd to pass back
- * to the caller. If the session is not active, this _might_ immediately
- * revoke access and thus invalidate the fd. But this is still needed
- * to pass a valid fd back. */
- sd->active = session_is_active(s);
- r = session_device_open(sd, sd->active);
- if (r < 0) {
- /* EINVAL _may_ mean a master is active; retry inactive */
- if (sd->active && r == -EINVAL) {
- sd->active = false;
- r = session_device_open(sd, false);
+ if (open_device) {
+ /* Open the device for the first time. We need a valid fd to pass back
+ * to the caller. If the session is not active, this _might_ immediately
+ * revoke access and thus invalidate the fd. But this is still needed
+ * to pass a valid fd back. */
+ sd->active = session_is_active(s);
+ r = session_device_open(sd, sd->active);
+ if (r < 0) {
+ /* EINVAL _may_ mean a master is active; retry inactive */
+ if (sd->active && r == -EINVAL) {
+ sd->active = false;
+ r = session_device_open(sd, false);
+ }
+ if (r < 0)
+ goto error;
}
- if (r < 0)
- goto error;
+ sd->fd = r;
}
- sd->fd = r;
- LIST_PREPEND(SessionDevice, sd_by_device, sd->device->session_devices, sd);
+ LIST_PREPEND(sd_by_device, sd->device->session_devices, sd);
*out = sd;
return 0;
@@ -421,9 +414,9 @@ void session_device_free(SessionDevice *sd) {
session_device_stop(sd);
session_device_notify(sd, SESSION_DEVICE_RELEASE);
- close_nointr_nofail(sd->fd);
+ close_nointr(sd->fd);
- LIST_REMOVE(SessionDevice, sd_by_device, sd->device->session_devices, sd);
+ LIST_REMOVE(sd_by_device, sd->device->session_devices, sd);
hashmap_remove(sd->session->devices, &sd->dev);
@@ -452,15 +445,16 @@ void session_device_complete_pause(SessionDevice *sd) {
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);
+ if (session_device_start(sd) < 0)
+ continue;
+ if (session_device_save(sd) < 0)
+ continue;
+ session_device_notify(sd, SESSION_DEVICE_RESUME);
}
}
}
@@ -495,3 +489,36 @@ unsigned int session_device_try_pause_all(Session *s) {
return num_pending;
}
+
+int session_device_save(SessionDevice *sd) {
+ _cleanup_free_ char *state = NULL;
+ int r;
+
+ assert(sd);
+
+ /* Store device fd in PID1. It will send it back to us on
+ * restart so revocation will continue to work. To make things
+ * simple, send fds for all type of devices even if they don't
+ * support the revocation mechanism so we don't have to handle
+ * them differently later.
+ *
+ * Note: for device supporting revocation, PID1 will drop a
+ * stored fd automatically if the corresponding device is
+ * revoked. */
+ r = asprintf(&state, "FDSTORE=1\n"
+ "FDNAME=session-%s", sd->session->id);
+ if (r < 0)
+ return -ENOMEM;
+
+ return sd_pid_notify_with_fds(0, false, state, &sd->fd, 1);
+}
+
+void session_device_attach_fd(SessionDevice *sd, int fd, bool active) {
+ assert(fd > 0);
+ assert(sd);
+ assert(sd->fd < 0);
+ assert(!sd->active);
+
+ sd->fd = fd;
+ sd->active = active;
+}