[PATCH 7/7] launcher: add logind backend
Kristian Høgsberg
hoegsberg at gmail.com
Tue Oct 15 20:47:19 CEST 2013
On Tue, Oct 15, 2013 at 02:30:02PM +0200, David Herrmann wrote:
> Instead of spawning weston-launch from the launcher-util, we now try to
> connect to logind first. If logind provides session-devices, we use them.
> If not, we fall back to the old weston-launch facility.
> ---
> configure.ac | 1 +
> src/Makefile.am | 8 +
> src/compositor-drm.c | 2 +-
> src/compositor-fbdev.c | 2 +-
> src/compositor-rpi.c | 2 +-
> src/launcher-util.c | 40 ++-
> src/launcher-util.h | 3 +-
> src/logind-util.c | 913 +++++++++++++++++++++++++++++++++++++++++++++++++
> src/logind-util.h | 94 +++++
> 9 files changed, 1054 insertions(+), 11 deletions(-)
> create mode 100644 src/logind-util.c
> create mode 100644 src/logind-util.h
I applied the whole patch series and stubbed out the call to
sd_session_get_vt() (instead of updating systemd), but I then get
[11:35:04.658] logind: cannot take control over session 4
in the weston log and journalctl tells me
Oct 15 11:34:52 tokamak.local dbus-daemon[444]: dbus[444]: [system] Rejected send message, 2 matched rules; type="method_call", sender=":1.75" (uid=1000 pid=17613 comm="weston --tty=2 ") interface="org.freedesktop.login1.Session" member="TakeControl" error name="(unset)" requested_reply="0" destination="org.freedesktop.login1" (uid=0 pid=441 comm="/usr/lib/systemd/systemd-logind ")
Oct 15 11:34:52 tokamak.local dbus[444]: [system] Rejected send message, 2 matched rules; type="method_call", sender=":1.75" (uid=1000 pid=17613 comm="weston --tty=2 ") interface="org.freedesktop.login1.Session" member="TakeControl" error name="(unset)" requested_reply="0" destination="org.freedesktop.login1" (uid=0 pid=441 comm="/usr/lib/systemd/systemd-logind ")
Also, logind-util.c does all the vt setup and teardown, but I wonder
what happens if weston crashes. Will logind reset the vt (unmute,
KD_TEXT etc) or will the system get stuck? One of the benefits of the
recent weston-launch rewrite was that weston-launch will clean up if
weston crashes, which is much more reliable.
Kristian
> diff --git a/configure.ac b/configure.ac
> index 643209c..ace1305 100644
> --- a/configure.ac
> +++ b/configure.ac
> @@ -325,6 +325,7 @@ PKG_CHECK_MODULES(SYSTEMD_LOGIN_207, [libsystemd-login >= 207],
> [have_systemd_login_207=yes], [have_systemd_login_207=no])
> AS_IF([test "x$have_systemd_login_207" = "xyes"],
> [AC_DEFINE([HAVE_SYSTEMD_LOGIN_207], [1], [Have systemd-login >= 207])])
> +AM_CONDITIONAL(HAVE_SYSTEMD_LOGIN_207, test "x$have_systemd_login_207" = "xyes")
>
> PKG_CHECK_MODULES(LAUNCHER_UTIL, [libsystemd-login],,)
> PKG_CHECK_MODULES(WESTON_LAUNCH, [libdrm libsystemd-login],,)
> diff --git a/src/Makefile.am b/src/Makefile.am
> index 44ebfc2..bdfef9f 100644
> --- a/src/Makefile.am
> +++ b/src/Makefile.am
> @@ -54,6 +54,14 @@ weston_SOURCES += \
> dbus.c
> weston_CFLAGS += $(DBUS_CFLAGS)
> weston_LDADD += $(DBUS_LIBS)
> +
> +if HAVE_SYSTEMD_LOGIN_207
> +weston_SOURCES += \
> + logind-util.h \
> + logind-util.c
> +weston_CFLAGS += $(SYSTEMD_LOGIN_207_CFLAGS)
> +weston_LDADD += $(SYSTEMD_LOGIN_207_LIBS)
> +endif
> endif
>
> git-version.h : .FORCE
> diff --git a/src/compositor-drm.c b/src/compositor-drm.c
> index 25c34f8..052d594 100644
> --- a/src/compositor-drm.c
> +++ b/src/compositor-drm.c
> @@ -2599,7 +2599,7 @@ drm_compositor_create(struct wl_display *display,
> }
>
> /* Check if we run drm-backend using weston-launch */
> - ec->base.launcher = weston_launcher_connect(&ec->base, tty);
> + ec->base.launcher = weston_launcher_connect(&ec->base, tty, seat_id);
> if (ec->base.launcher == NULL) {
> weston_log("fatal: drm backend should be run "
> "using weston-launch binary or as root\n");
> diff --git a/src/compositor-fbdev.c b/src/compositor-fbdev.c
> index 4376345..80e708d 100644
> --- a/src/compositor-fbdev.c
> +++ b/src/compositor-fbdev.c
> @@ -894,7 +894,7 @@ fbdev_compositor_create(struct wl_display *display, int *argc, char *argv[],
> wl_signal_add(&compositor->base.session_signal,
> &compositor->session_listener);
> compositor->base.launcher =
> - weston_launcher_connect(&compositor->base, param->tty);
> + weston_launcher_connect(&compositor->base, param->tty, "seat0");
> if (!compositor->base.launcher) {
> weston_log("fatal: fbdev backend should be run "
> "using weston-launch binary or as root\n");
> diff --git a/src/compositor-rpi.c b/src/compositor-rpi.c
> index 05667fb..07816a5 100644
> --- a/src/compositor-rpi.c
> +++ b/src/compositor-rpi.c
> @@ -752,7 +752,7 @@ rpi_compositor_create(struct wl_display *display, int *argc, char *argv[],
> wl_signal_add(&compositor->base.session_signal,
> &compositor ->session_listener);
> compositor->base.launcher =
> - weston_launcher_connect(&compositor->base, param->tty);
> + weston_launcher_connect(&compositor->base, param->tty, "seat0");
> if (!compositor->base.launcher) {
> weston_log("Failed to initialize tty.\n");
> goto out_udev;
> diff --git a/src/launcher-util.c b/src/launcher-util.c
> index 30e62fc..2a431a8 100644
> --- a/src/launcher-util.c
> +++ b/src/launcher-util.c
> @@ -43,6 +43,7 @@
>
> #include "compositor.h"
> #include "launcher-util.h"
> +#include "logind-util.h"
> #include "weston-launch.h"
>
> #ifndef KDSKBMUTE
> @@ -57,6 +58,7 @@ union cmsg_data { unsigned char b[4]; int fd; };
>
> struct weston_launcher {
> struct weston_compositor *compositor;
> + struct weston_logind *logind;
> struct passwd *pw;
> struct weston_process launcher;
> int fd, event_fd;
> @@ -87,6 +89,9 @@ weston_launcher_open(struct weston_launcher *launcher,
> ssize_t len;
> struct weston_launcher_open *message;
>
> + if (launcher->logind)
> + return weston_logind_open(launcher->logind, path, flags);
> +
> n = sizeof(*message) + strlen(path) + 1;
> message = malloc(n);
> if (!message)
> @@ -140,6 +145,9 @@ weston_launcher_open(struct weston_launcher *launcher,
> void
> weston_launcher_close(struct weston_launcher *launcher, int fd)
> {
> + if (launcher->logind)
> + return weston_logind_close(launcher->logind, fd);
> +
> close(fd);
> }
>
> @@ -148,6 +156,9 @@ weston_launcher_restore(struct weston_launcher *launcher)
> {
> struct vt_mode mode = { 0 };
>
> + if (launcher->logind)
> + return weston_logind_restore(launcher->logind);
> +
> ioctl(launcher->tty, KDSKBMUTE, 0);
> ioctl(launcher->tty, KDSKBMODE, launcher->kb_mode);
> ioctl(launcher->tty, KDSETMODE, KD_TEXT);
> @@ -197,6 +208,9 @@ weston_launcher_activate_vt(struct weston_launcher *launcher, int vt)
> ssize_t len;
> struct weston_launcher_switchvt message;
>
> + if (launcher->logind)
> + return weston_logind_activate_vt(launcher->logind, vt);
> +
> /* VT_ACTIVATE is a privileged ioctl so ask weston-launch */
>
> message.header.opcode = WESTON_LAUNCHER_SWITCHVT;
> @@ -398,7 +412,8 @@ setup_tty(struct weston_launcher *wl, int ttyid)
> }
>
> struct weston_launcher *
> -weston_launcher_connect(struct weston_compositor *compositor, int tty)
> +weston_launcher_connect(struct weston_compositor *compositor, int tty,
> + const char *seat_id)
> {
> struct weston_launcher *launcher;
> struct wl_event_loop *loop;
> @@ -414,6 +429,12 @@ weston_launcher_connect(struct weston_compositor *compositor, int tty)
> launcher->fd = -1;
> launcher->event_fd = -1;
>
> + r = weston_logind_connect(&launcher->logind, compositor, seat_id, tty);
> + if (r >= 0)
> + return launcher;
> +
> + launcher->logind = NULL;
> +
> r = setup_tty(launcher, tty);
> if (r < 0)
> goto err_free;
> @@ -448,11 +469,16 @@ err_free:
> void
> weston_launcher_destroy(struct weston_launcher *launcher)
> {
> - wl_list_remove(&launcher->launcher.link);
> - wl_event_source_remove(launcher->source);
> - close(launcher->event_fd);
> - close(launcher->fd);
> - weston_launcher_restore(launcher);
> - close(launcher->tty);
> + if (launcher->logind) {
> + weston_logind_destroy(launcher->logind);
> + } else {
> + wl_list_remove(&launcher->launcher.link);
> + wl_event_source_remove(launcher->source);
> + close(launcher->event_fd);
> + close(launcher->fd);
> + weston_launcher_restore(launcher);
> + close(launcher->tty);
> + }
> +
> free(launcher);
> }
> diff --git a/src/launcher-util.h b/src/launcher-util.h
> index 9de5237..d5b2fc9 100644
> --- a/src/launcher-util.h
> +++ b/src/launcher-util.h
> @@ -30,7 +30,8 @@
> struct weston_launcher;
>
> struct weston_launcher *
> -weston_launcher_connect(struct weston_compositor *compositor, int tty);
> +weston_launcher_connect(struct weston_compositor *compositor, int tty,
> + const char *seat_id);
>
> void
> weston_launcher_destroy(struct weston_launcher *launcher);
> diff --git a/src/logind-util.c b/src/logind-util.c
> new file mode 100644
> index 0000000..066f751
> --- /dev/null
> +++ b/src/logind-util.c
> @@ -0,0 +1,913 @@
> +/*
> + * Copyright © 2013 David Herrmann
> + *
> + * Permission to use, copy, modify, distribute, and sell this software and
> + * its documentation for any purpose is hereby granted without fee, provided
> + * that the above copyright notice appear in all copies and that both that
> + * copyright notice and this permission notice appear in supporting
> + * documentation, and that the name of the copyright holders not be used in
> + * advertising or publicity pertaining to distribution of the software
> + * without specific, written prior permission. The copyright holders make
> + * no representations about the suitability of this software for any
> + * purpose. It is provided "as is" without express or implied warranty.
> + *
> + * THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS
> + * SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND
> + * FITNESS, IN NO EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY
> + * SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER
> + * RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF
> + * CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
> + * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
> + */
> +
> +#include "config.h"
> +
> +#include <errno.h>
> +#include <dbus.h>
> +#include <fcntl.h>
> +#include <linux/vt.h>
> +#include <linux/kd.h>
> +#include <linux/major.h>
> +#include <signal.h>
> +#include <stdarg.h>
> +#include <stdbool.h>
> +#include <stdio.h>
> +#include <stdlib.h>
> +#include <string.h>
> +#include <sys/ioctl.h>
> +#include <sys/signalfd.h>
> +#include <sys/stat.h>
> +#include <systemd/sd-login.h>
> +#include <unistd.h>
> +
> +#include "compositor.h"
> +#include "dbus.h"
> +#include "logind-util.h"
> +
> +#ifndef KDSKBMUTE
> +#define KDSKBMUTE 0x4B51
> +#endif
> +
> +struct weston_logind {
> + struct weston_compositor *compositor;
> + char *seat;
> + char *sid;
> + unsigned int vtnr;
> + int vt;
> + int kb_mode;
> + int sfd;
> + struct wl_event_source *sfd_source;
> +
> + DBusConnection *dbus;
> + struct wl_event_source *dbus_ctx;
> + char *spath;
> + DBusPendingCall *pending_active;
> +};
> +
> +static int
> +weston_logind_take_device(struct weston_logind *wl, uint32_t major,
> + uint32_t minor, bool *paused_out)
> +{
> + DBusMessage *m, *reply;
> + bool b, paused;
> + int r, fd;
> +
> + m = dbus_message_new_method_call("org.freedesktop.login1",
> + wl->spath,
> + "org.freedesktop.login1.Session",
> + "TakeDevice");
> + if (!m)
> + return -ENOMEM;
> +
> + b = dbus_message_append_args(m,
> + DBUS_TYPE_UINT32, &major,
> + DBUS_TYPE_UINT32, &minor,
> + DBUS_TYPE_INVALID);
> + if (!b) {
> + r = -ENOMEM;
> + goto err_unref;
> + }
> +
> + reply = dbus_connection_send_with_reply_and_block(wl->dbus, m,
> + -1, NULL);
> + if (!reply) {
> + r = -ENODEV;
> + goto err_unref;
> + }
> +
> + b = dbus_message_get_args(reply, NULL,
> + DBUS_TYPE_UNIX_FD, &fd,
> + DBUS_TYPE_BOOLEAN, &paused,
> + DBUS_TYPE_INVALID);
> + if (!b) {
> + r = -ENODEV;
> + goto err_reply;
> + }
> +
> + r = fd;
> + if (paused_out)
> + *paused_out = paused;
> +
> +err_reply:
> + dbus_message_unref(reply);
> +err_unref:
> + dbus_message_unref(m);
> + return r;
> +}
> +
> +static void
> +weston_logind_release_device(struct weston_logind *wl, uint32_t major,
> + uint32_t minor)
> +{
> + DBusMessage *m;
> + bool b;
> +
> + m = dbus_message_new_method_call("org.freedesktop.login1",
> + wl->spath,
> + "org.freedesktop.login1.Session",
> + "ReleaseDevice");
> + if (m) {
> + b = dbus_message_append_args(m,
> + DBUS_TYPE_UINT32, &major,
> + DBUS_TYPE_UINT32, &minor,
> + DBUS_TYPE_INVALID);
> + if (b)
> + dbus_connection_send(wl->dbus, m, NULL);
> + dbus_message_unref(m);
> + }
> +}
> +
> +static void
> +weston_logind_pause_device_complete(struct weston_logind *wl, uint32_t major,
> + uint32_t minor)
> +{
> + DBusMessage *m;
> + bool b;
> +
> + m = dbus_message_new_method_call("org.freedesktop.login1",
> + wl->spath,
> + "org.freedesktop.login1.Session",
> + "PauseDeviceComplete");
> + if (m) {
> + b = dbus_message_append_args(m,
> + DBUS_TYPE_UINT32, &major,
> + DBUS_TYPE_UINT32, &minor,
> + DBUS_TYPE_INVALID);
> + if (b)
> + dbus_connection_send(wl->dbus, m, NULL);
> + dbus_message_unref(m);
> + }
> +}
> +
> +WL_EXPORT int
> +weston_logind_open(struct weston_logind *wl, const char *path,
> + int flags)
> +{
> + struct stat st;
> + int fl, r, fd;
> +
> + r = stat(path, &st);
> + if (r < 0)
> + return -errno;
> + if (!S_ISCHR(st.st_mode))
> + return -ENODEV;
> +
> + fd = weston_logind_take_device(wl, major(st.st_rdev),
> + minor(st.st_rdev), NULL);
> + if (fd < 0)
> + return fd;
> +
> + /* Compared to weston_launcher_open() we cannot specify the open-mode
> + * directly. Instead, logind passes us an fd with sane default modes.
> + * For DRM and evdev this means O_RDWR | O_CLOEXEC. If we want
> + * something else, we need to change it afterwards. We currently
> + * only support dropping FD_CLOEXEC and setting O_NONBLOCK. Changing
> + * access-modes is not possible so accept whatever logind passes us. */
> +
> + fl = fcntl(fd, F_GETFL);
> + if (fl < 0) {
> + r = -errno;
> + goto err_close;
> + }
> +
> + if (flags & O_NONBLOCK)
> + fl |= O_NONBLOCK;
> +
> + r = fcntl(fd, F_SETFL, fl);
> + if (r < 0) {
> + r = -errno;
> + goto err_close;
> + }
> +
> + fl = fcntl(fd, F_GETFD);
> + if (fl < 0) {
> + r = -errno;
> + goto err_close;
> + }
> +
> + if (!(flags & O_CLOEXEC))
> + fl &= ~FD_CLOEXEC;
> +
> + r = fcntl(fd, F_SETFD, fl);
> + if (r < 0) {
> + r = -errno;
> + goto err_close;
> + }
> +
> + return fd;
> +
> +err_close:
> + close(fd);
> + weston_logind_release_device(wl, major(st.st_rdev),
> + minor(st.st_rdev));
> + return r;
> +}
> +
> +WL_EXPORT void
> +weston_logind_close(struct weston_logind *wl, int fd)
> +{
> + struct stat st;
> + int r;
> +
> + r = fstat(fd, &st);
> + if (r < 0) {
> + weston_log("logind: cannot fstat fd: %m\n");
> + return;
> + }
> +
> + if (!S_ISCHR(st.st_mode)) {
> + weston_log("logind: invalid device passed\n");
> + return;
> + }
> +
> + weston_logind_release_device(wl, major(st.st_rdev),
> + minor(st.st_rdev));
> +}
> +
> +WL_EXPORT void
> +weston_logind_restore(struct weston_logind *wl)
> +{
> + struct vt_mode mode = { 0 };
> +
> + ioctl(wl->vt, KDSETMODE, KD_TEXT);
> + ioctl(wl->vt, KDSKBMUTE, 0);
> + ioctl(wl->vt, KDSKBMODE, wl->kb_mode);
> + mode.mode = VT_AUTO;
> + ioctl(wl->vt, VT_SETMODE, &mode);
> +}
> +
> +WL_EXPORT int
> +weston_logind_activate_vt(struct weston_logind *wl, int vt)
> +{
> + int r;
> +
> + r = ioctl(wl->vt, VT_ACTIVATE, vt);
> + if (r < 0)
> + return -errno;
> +
> + return 0;
> +}
> +
> +static void
> +weston_logind_set_active(struct weston_logind *wl, bool active)
> +{
> + if (active)
> + wl->compositor->session_active = 1;
> + else
> + wl->compositor->session_active = 0;
> +
> + wl_signal_emit(&wl->compositor->session_signal,
> + wl->compositor);
> +}
> +
> +static void
> +get_active_cb(DBusPendingCall *pending, void *data)
> +{
> + struct weston_logind *wl = data;
> + DBusMessage *m;
> + DBusMessageIter iter, sub;
> + int type;
> + bool b;
> +
> + dbus_pending_call_unref(wl->pending_active);
> + wl->pending_active = NULL;
> +
> + m = dbus_pending_call_steal_reply(pending);
> + if (!m)
> + return;
> +
> + type = dbus_message_get_type(m);
> + if (type != DBUS_MESSAGE_TYPE_METHOD_RETURN)
> + goto err_unref;
> +
> + if (!dbus_message_iter_init(m, &iter) ||
> + dbus_message_iter_get_arg_type(&iter) != DBUS_TYPE_VARIANT)
> + goto err_unref;
> +
> + dbus_message_iter_recurse(&iter, &sub);
> +
> + if (dbus_message_iter_get_arg_type(&sub) != DBUS_TYPE_BOOLEAN)
> + goto err_unref;
> +
> + dbus_message_iter_get_basic(&sub, &b);
> + weston_logind_set_active(wl, b);
> +
> +err_unref:
> + dbus_message_unref(m);
> +}
> +
> +static void
> +weston_logind_get_active(struct weston_logind *wl)
> +{
> + DBusPendingCall *pending;
> + DBusMessage *m;
> + bool b;
> + const char *iface, *name;
> +
> + m = dbus_message_new_method_call("org.freedesktop.login1",
> + wl->spath,
> + "org.freedesktop.DBus.Properties",
> + "Get");
> + if (!m)
> + return;
> +
> + iface = "org.freedesktop.login1.Session";
> + name = "Active";
> + b = dbus_message_append_args(m,
> + DBUS_TYPE_STRING, &iface,
> + DBUS_TYPE_STRING, &name,
> + DBUS_TYPE_INVALID);
> + if (!b)
> + goto err_unref;
> +
> + b = dbus_connection_send_with_reply(wl->dbus, m, &pending, -1);
> + if (!b)
> + goto err_unref;
> +
> + b = dbus_pending_call_set_notify(pending, get_active_cb, wl, NULL);
> + if (!b) {
> + dbus_pending_call_cancel(pending);
> + dbus_pending_call_unref(pending);
> + goto err_unref;
> + }
> +
> + if (wl->pending_active) {
> + dbus_pending_call_cancel(wl->pending_active);
> + dbus_pending_call_unref(wl->pending_active);
> + }
> + wl->pending_active = pending;
> + return;
> +
> +err_unref:
> + dbus_message_unref(m);
> +}
> +
> +static void
> +disconnected_dbus(struct weston_logind *wl)
> +{
> + weston_log("logind: dbus connection lost, exiting..\n");
> + weston_logind_restore(wl);
> + exit(-1);
> +}
> +
> +static void
> +session_removed(struct weston_logind *wl, DBusMessage *m)
> +{
> + const char *name, *obj;
> + bool r;
> +
> + r = dbus_message_get_args(m, NULL,
> + DBUS_TYPE_STRING, &name,
> + DBUS_TYPE_OBJECT_PATH, &obj,
> + DBUS_TYPE_INVALID);
> + if (!r) {
> + weston_log("logind: cannot parse SessionRemoved dbus signal\n");
> + return;
> + }
> +
> + if (!strcmp(name, wl->sid)) {
> + weston_log("logind: our session got closed, exiting..\n");
> + weston_logind_restore(wl);
> + exit(-1);
> + }
> +}
> +
> +static void
> +property_changed(struct weston_logind *wl, DBusMessage *m)
> +{
> + DBusMessageIter iter, sub, entry;
> + const char *interface, *name;
> + dbus_bool_t b;
> +
> + if (!dbus_message_iter_init(m, &iter) ||
> + dbus_message_iter_get_arg_type(&iter) != DBUS_TYPE_STRING)
> + goto error;
> +
> + dbus_message_iter_get_basic(&iter, &interface);
> +
> + if (!dbus_message_iter_next(&iter) ||
> + dbus_message_iter_get_arg_type(&iter) != DBUS_TYPE_ARRAY)
> + goto error;
> +
> + dbus_message_iter_recurse(&iter, &sub);
> +
> + while (dbus_message_iter_get_arg_type(&sub) == DBUS_TYPE_DICT_ENTRY) {
> + dbus_message_iter_recurse(&sub, &entry);
> +
> + if (dbus_message_iter_get_arg_type(&entry) != DBUS_TYPE_STRING)
> + goto error;
> +
> + dbus_message_iter_get_basic(&entry, &name);
> + if (!dbus_message_iter_next(&entry))
> + goto error;
> +
> + if (!strcmp(name, "Active")) {
> + if (dbus_message_iter_get_arg_type(&entry) == DBUS_TYPE_BOOLEAN) {
> + dbus_message_iter_get_basic(&entry, &b);
> + weston_logind_set_active(wl, b);
> + return;
> + }
> + }
> +
> + dbus_message_iter_next(&sub);
> + }
> +
> + if (!dbus_message_iter_next(&iter) ||
> + dbus_message_iter_get_arg_type(&iter) != DBUS_TYPE_ARRAY)
> + goto error;
> +
> + dbus_message_iter_recurse(&iter, &sub);
> +
> + while (dbus_message_iter_get_arg_type(&sub) == DBUS_TYPE_STRING) {
> + dbus_message_iter_get_basic(&sub, &name);
> +
> + if (!strcmp(name, "Active")) {
> + weston_logind_get_active(wl);
> + return;
> + }
> +
> + dbus_message_iter_next(&sub);
> + }
> +
> + return;
> +
> +error:
> + weston_log("logind: cannot parse PropertiesChanged dbus signal\n");
> +}
> +
> +static void
> +device_paused(struct weston_logind *wl, DBusMessage *m)
> +{
> + bool r;
> + const char *type;
> + uint32_t major, minor;
> +
> + r = dbus_message_get_args(m, NULL,
> + DBUS_TYPE_UINT32, &major,
> + DBUS_TYPE_UINT32, &minor,
> + DBUS_TYPE_STRING, &type,
> + DBUS_TYPE_INVALID);
> + if (!r) {
> + weston_log("logind: cannot parse PauseDevice dbus signal\n");
> + return;
> + }
> +
> + /* "pause" means synchronous pausing. Acknowledge it unconditionally
> + * as we support asynchronous device shutdowns, anyway.
> + * "force" means asynchronous pausing. We ignore it as the following
> + * session-deactivation will suffice as notification.
> + * "gone" means the device is gone. We ignore it as we receive a
> + * udev notification, anyway. */
> +
> + if (!strcmp(type, "pause"))
> + weston_logind_pause_device_complete(wl, major, minor);
> +}
> +
> +static void
> +device_resumed(struct weston_logind *wl, DBusMessage *m)
> +{
> + /*
> + * DeviceResumed messages provide us a new file-descriptor for
> + * resumed devices. For DRM devices it's the same as before, for evdev
> + * devices it's a new open-file. As we reopen evdev devices, anyway,
> + * there is no need for us to handle this event. If we ever optimize
> + * our evdev code to support resuming devices, this event can be
> + * parsed like this:
> + * r = dbus_message_get_args(m, NULL,
> + * DBUS_TYPE_UINT32, &major,
> + * DBUS_TYPE_UINT32, &minor,
> + * DBUS_TYPE_UNIX_FD, &fd,
> + * DBUS_TYPE_INVALID);
> + */
> +}
> +
> +static DBusHandlerResult
> +filter_dbus(DBusConnection *c, DBusMessage *m, void *data)
> +{
> + struct weston_logind *wl = data;
> +
> + if (dbus_message_is_signal(m, DBUS_INTERFACE_LOCAL, "Disconnected")) {
> + disconnected_dbus(wl);
> + } else if (dbus_message_is_signal(m, "org.freedesktop.login1.Manager",
> + "SessionRemoved")) {
> + session_removed(wl, m);
> + } else if (dbus_message_is_signal(m, "org.freedesktop.DBus.Properties",
> + "PropertiesChanged")) {
> + property_changed(wl, m);
> + } else if (dbus_message_is_signal(m, "org.freedesktop.login1.Session",
> + "PauseDevice")) {
> + device_paused(wl, m);
> + } else if (dbus_message_is_signal(m, "org.freedesktop.login1.Session",
> + "ResumeDevice")) {
> + device_resumed(wl, m);
> + }
> +
> + return DBUS_HANDLER_RESULT_NOT_YET_HANDLED;
> +}
> +
> +static int
> +weston_logind_setup_dbus(struct weston_logind *wl)
> +{
> + bool b;
> + int r;
> +
> + r = asprintf(&wl->spath, "/org/freedesktop/login1/session/%s",
> + wl->sid);
> + if (r < 0)
> + return -ENOMEM;
> +
> + b = dbus_connection_add_filter(wl->dbus, filter_dbus, wl, NULL);
> + if (!b) {
> + weston_log("logind: cannot add dbus filter\n");
> + r = -ENOMEM;
> + goto err_spath;
> + }
> +
> + r = weston_dbus_add_match_signal(wl->dbus,
> + "org.freedesktop.login1",
> + "org.freedesktop.login1.Manager",
> + "SessionRemoved",
> + "/org/freedesktop/login1");
> + if (r < 0) {
> + weston_log("logind: cannot add dbus match\n");
> + goto err_spath;
> + }
> +
> + r = weston_dbus_add_match_signal(wl->dbus,
> + "org.freedesktop.login1",
> + "org.freedesktop.login1.Session",
> + "PauseDevice",
> + wl->spath);
> + if (r < 0) {
> + weston_log("logind: cannot add dbus match\n");
> + goto err_spath;
> + }
> +
> + r = weston_dbus_add_match_signal(wl->dbus,
> + "org.freedesktop.login1",
> + "org.freedesktop.login1.Session",
> + "ResumeDevice",
> + wl->spath);
> + if (r < 0) {
> + weston_log("logind: cannot add dbus match\n");
> + goto err_spath;
> + }
> +
> + r = weston_dbus_add_match_signal(wl->dbus,
> + "org.freedesktop.login1",
> + "org.freedesktop.DBus.Properties",
> + "PropertiesChanged",
> + wl->spath);
> + if (r < 0) {
> + weston_log("logind: cannot add dbus match\n");
> + goto err_spath;
> + }
> +
> + return 0;
> +
> +err_spath:
> + /* don't remove any dbus-match as the connection is closed, anyway */
> + free(wl->spath);
> + return r;
> +}
> +
> +static void
> +weston_logind_destroy_dbus(struct weston_logind *wl)
> +{
> + /* don't remove any dbus-match as the connection is closed, anyway */
> + free(wl->spath);
> +}
> +
> +static int
> +weston_logind_take_control(struct weston_logind *wl)
> +{
> + DBusError err;
> + DBusMessage *m, *reply;
> + dbus_bool_t force;
> + bool b;
> + int r;
> +
> + dbus_error_init(&err);
> +
> + m = dbus_message_new_method_call("org.freedesktop.login1",
> + wl->spath,
> + "org.freedesktop.login1.Session",
> + "TakeControl");
> + if (!m)
> + return -ENOMEM;
> +
> + force = false;
> + b = dbus_message_append_args(m,
> + DBUS_TYPE_BOOLEAN, &force,
> + DBUS_TYPE_INVALID);
> + if (!b) {
> + r = -ENOMEM;
> + goto err_unref;
> + }
> +
> + reply = dbus_connection_send_with_reply_and_block(wl->dbus,
> + m, -1, &err);
> + if (!reply) {
> + if (dbus_error_has_name(&err, DBUS_ERROR_UNKNOWN_METHOD))
> + weston_log("logind: old systemd version detected\n");
> + else
> + weston_log("logind: cannot take control over session %s\n", wl->sid);
> +
> + dbus_error_free(&err);
> + r = -EIO;
> + goto err_unref;
> + }
> +
> + dbus_message_unref(reply);
> + dbus_message_unref(m);
> + return 0;
> +
> +err_unref:
> + dbus_message_unref(m);
> + return r;
> +}
> +
> +static void
> +weston_logind_release_control(struct weston_logind *wl)
> +{
> + DBusMessage *m;
> +
> + m = dbus_message_new_method_call("org.freedesktop.login1",
> + wl->spath,
> + "org.freedesktop.login1.Session",
> + "ReleaseControl");
> + if (m) {
> + dbus_connection_send(wl->dbus, m, NULL);
> + dbus_message_unref(m);
> + }
> +}
> +
> +static int
> +signal_event(int fd, uint32_t mask, void *data)
> +{
> + struct weston_logind *wl = data;
> + struct signalfd_siginfo sig;
> +
> + if (read(fd, &sig, sizeof sig) != sizeof sig) {
> + weston_log("logind: cannot read signalfd: %m\n");
> + return 0;
> + }
> +
> + switch (sig.ssi_signo) {
> + case SIGUSR1:
> + ioctl(wl->vt, VT_RELDISP, 1);
> + break;
> + case SIGUSR2:
> + ioctl(wl->vt, VT_RELDISP, VT_ACKACQ);
> + break;
> + }
> +
> + return 0;
> +}
> +
> +static int
> +weston_logind_setup_vt(struct weston_logind *wl)
> +{
> + struct stat st;
> + char buf[64];
> + struct vt_mode mode = { 0 };
> + int r;
> + sigset_t mask;
> + struct wl_event_loop *loop;
> +
> + snprintf(buf, sizeof(buf), "/dev/tty%d", wl->vtnr);
> + buf[sizeof(buf) - 1] = 0;
> +
> + wl->vt = open(buf, O_RDWR|O_CLOEXEC|O_NONBLOCK);
> +
> + if (wl->vt < 0) {
> + r = -errno;
> + weston_log("logind: cannot open VT %s: %m\n", buf);
> + return r;
> + }
> +
> + if (fstat(wl->vt, &st) == -1 ||
> + major(st.st_rdev) != TTY_MAJOR || minor(st.st_rdev) <= 0 ||
> + minor(st.st_rdev) >= 64) {
> + r = -EINVAL;
> + weston_log("logind: TTY %s is no virtual terminal\n", buf);
> + goto err_close;
> + }
> +
> + r = setsid();
> + if (r < 0 && errno != EPERM) {
> + r = -errno;
> + weston_log("logind: setsid() failed: %m\n");
> + goto err_close;
> + }
> +
> + r = ioctl(wl->vt, TIOCSCTTY, 0);
> + if (r < 0)
> + weston_log("logind: VT %s already in use\n", buf);
> +
> + if (ioctl(wl->vt, KDGKBMODE, &wl->kb_mode) < 0) {
> + weston_log("logind: cannot read keyboard mode on %s: %m\n",
> + buf);
> + wl->kb_mode = K_UNICODE;
> + } else if (wl->kb_mode == K_OFF) {
> + wl->kb_mode = K_UNICODE;
> + }
> +
> + if (ioctl(wl->vt, KDSKBMUTE, 1) < 0 &&
> + ioctl(wl->vt, KDSKBMODE, K_OFF) < 0) {
> + r = -errno;
> + weston_log("logind: cannot set K_OFF KB-mode on %s: %m\n",
> + buf);
> + goto err_close;
> + }
> +
> + if (ioctl(wl->vt, KDSETMODE, KD_GRAPHICS) < 0) {
> + r = -errno;
> + weston_log("logind: cannot set KD_GRAPHICS mode on %s: %m\n",
> + buf);
> + goto err_kbmode;
> + }
> +
> + sigemptyset(&mask);
> + sigaddset(&mask, SIGUSR1);
> + sigaddset(&mask, SIGUSR2);
> + sigprocmask(SIG_BLOCK, &mask, NULL);
> +
> + wl->sfd = signalfd(-1, &mask, SFD_NONBLOCK | SFD_CLOEXEC);
> + if (wl->sfd < 0) {
> + r = -errno;
> + weston_log("logind: cannot create signalfd: %m\n");
> + goto err_mode;
> + }
> +
> + loop = wl_display_get_event_loop(wl->compositor->wl_display);
> + wl->sfd_source = wl_event_loop_add_fd(loop, wl->sfd,
> + WL_EVENT_READABLE,
> + signal_event, wl);
> + if (!wl->sfd_source) {
> + r = -errno;
> + weston_log("logind: cannot create signalfd source: %m\n");
> + goto err_sfd;
> + }
> +
> + mode.mode = VT_PROCESS;
> + mode.relsig = SIGUSR1;
> + mode.acqsig = SIGUSR2;
> + if (ioctl(wl->vt, VT_SETMODE, &mode) < 0) {
> + r = -errno;
> + weston_log("logind: cannot take over VT: %m\n");
> + goto err_sfd_source;
> + }
> +
> + weston_log("logind: using VT %s\n", buf);
> + return 0;
> +
> +err_sfd_source:
> + wl_event_source_remove(wl->sfd_source);
> +err_sfd:
> + close(wl->sfd);
> +err_mode:
> + ioctl(wl->vt, KDSETMODE, KD_TEXT);
> +err_kbmode:
> + ioctl(wl->vt, KDSKBMUTE, 0);
> + ioctl(wl->vt, KDSKBMODE, wl->kb_mode);
> +err_close:
> + close(wl->vt);
> + return r;
> +}
> +
> +static void
> +weston_logind_destroy_vt(struct weston_logind *wl)
> +{
> + weston_logind_restore(wl);
> + wl_event_source_remove(wl->sfd_source);
> + close(wl->sfd);
> + close(wl->vt);
> +}
> +
> +WL_EXPORT int
> +weston_logind_connect(struct weston_logind **out,
> + struct weston_compositor *compositor,
> + const char *seat_id, int tty)
> +{
> + struct weston_logind *wl;
> + struct wl_event_loop *loop;
> + char *t;
> + int r;
> +
> + wl = calloc(1, sizeof(*wl));
> + if (!wl) {
> + r = -ENOMEM;
> + goto err_out;
> + }
> +
> + wl->compositor = compositor;
> +
> + wl->seat = strdup(seat_id);
> + if (!wl->seat) {
> + r = -ENOMEM;
> + goto err_wl;
> + }
> +
> + r = sd_pid_get_session(getpid(), &wl->sid);
> + if (r < 0) {
> + weston_log("logind: not running in a systemd session\n");
> + goto err_seat;
> + }
> +
> + t = NULL;
> + r = sd_session_get_seat(wl->sid, &t);
> + if (r < 0 || strcmp(seat_id, t)) {
> + weston_log("logind: weston's seat '%s' differs from session-seat '%s'\n",
> + seat_id, t);
> + free(t);
> + goto err_session;
> + }
> + free(t);
> +
> + r = sd_session_get_vt(wl->sid, &wl->vtnr);
> + if (r < 0) {
> + weston_log("logind: session not running on a VT\n");
> + goto err_session;
> + } else if (tty > 0 && wl->vtnr != (unsigned int )tty) {
> + weston_log("logind: requested VT --tty=%d differs from real session VT %u\n",
> + tty, wl->vtnr);
> + goto err_session;
> + }
> +
> + loop = wl_display_get_event_loop(compositor->wl_display);
> + r = weston_dbus_open(loop, DBUS_BUS_SYSTEM, &wl->dbus, &wl->dbus_ctx);
> + if (r < 0) {
> + weston_log("logind: cannot connect to system dbus\n");
> + goto err_session;
> + }
> +
> + r = weston_logind_setup_dbus(wl);
> + if (r < 0)
> + goto err_dbus;
> +
> + r = weston_logind_take_control(wl);
> + if (r < 0)
> + goto err_dbus_cleanup;
> +
> + r = weston_logind_setup_vt(wl);
> + if (r < 0)
> + goto err_control;
> +
> + weston_log("logind: session control granted\n");
> + *out = wl;
> + return 0;
> +
> +err_control:
> + weston_logind_release_control(wl);
> +err_dbus_cleanup:
> + weston_logind_destroy_dbus(wl);
> +err_dbus:
> + weston_dbus_close(wl->dbus, wl->dbus_ctx);
> +err_session:
> + free(wl->sid);
> +err_seat:
> + free(wl->seat);
> +err_wl:
> + free(wl);
> +err_out:
> + weston_log("logind: cannot setup systemd-logind helper (%d), using legacy fallback\n", r);
> + return r;
> +}
> +
> +WL_EXPORT void
> +weston_logind_destroy(struct weston_logind *wl)
> +{
> + if (wl->pending_active) {
> + dbus_pending_call_cancel(wl->pending_active);
> + dbus_pending_call_unref(wl->pending_active);
> + }
> +
> + weston_logind_destroy_vt(wl);
> + weston_logind_release_control(wl);
> + weston_logind_destroy_dbus(wl);
> + weston_dbus_close(wl->dbus, wl->dbus_ctx);
> + free(wl->sid);
> + free(wl->seat);
> + free(wl);
> +}
> diff --git a/src/logind-util.h b/src/logind-util.h
> new file mode 100644
> index 0000000..3fc7fe4
> --- /dev/null
> +++ b/src/logind-util.h
> @@ -0,0 +1,94 @@
> +/*
> + * Copyright © 2013 David Herrmann
> + *
> + * Permission to use, copy, modify, distribute, and sell this software and
> + * its documentation for any purpose is hereby granted without fee, provided
> + * that the above copyright notice appear in all copies and that both that
> + * copyright notice and this permission notice appear in supporting
> + * documentation, and that the name of the copyright holders not be used in
> + * advertising or publicity pertaining to distribution of the software
> + * without specific, written prior permission. The copyright holders make
> + * no representations about the suitability of this software for any
> + * purpose. It is provided "as is" without express or implied warranty.
> + *
> + * THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS
> + * SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND
> + * FITNESS, IN NO EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY
> + * SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER
> + * RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF
> + * CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
> + * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
> + */
> +
> +#include "config.h"
> +
> +#include <errno.h>
> +#include <stdlib.h>
> +#include <string.h>
> +
> +#include "compositor.h"
> +
> +struct weston_logind;
> +
> +#if defined(HAVE_SYSTEMD_LOGIN_207) && defined(HAVE_DBUS)
> +
> +int
> +weston_logind_open(struct weston_logind *wl, const char *path,
> + int flags);
> +
> +void
> +weston_logind_close(struct weston_logind *wl, int fd);
> +
> +void
> +weston_logind_restore(struct weston_logind *wl);
> +
> +int
> +weston_logind_activate_vt(struct weston_logind *wl, int vt);
> +
> +int
> +weston_logind_connect(struct weston_logind **out,
> + struct weston_compositor *compositor,
> + const char *seat_id, int tty);
> +
> +void
> +weston_logind_destroy(struct weston_logind *wl);
> +
> +#else /* defined(HAVE_SYSTEMD_LOGIN_207) && defined(HAVE_DBUS) */
> +
> +static inline int
> +weston_logind_open(struct weston_logind *wl, const char *path,
> + int flags)
> +{
> + return -ENOSYS;
> +}
> +
> +static inline void
> +weston_logind_close(struct weston_logind *wl, int fd)
> +{
> +}
> +
> +static inline void
> +weston_logind_restore(struct weston_logind *wl)
> +{
> +}
> +
> +static inline int
> +weston_logind_activate_vt(struct weston_logind *wl, int vt)
> +{
> + return -ENOSYS;
> +}
> +
> +static inline int
> +weston_logind_connect(struct weston_logind **out,
> + struct weston_compositor *compositor,
> + const char *seat_id, int tty)
> +{
> + return -ENOSYS;
> +}
> +
> +static inline void
> +weston_logind_destroy(struct weston_logind *wl)
> +{
> +}
> +
> +#endif /* defined(HAVE_SYSTEMD_LOGIN_207) && defined(HAVE_DBUS) */
> --
> 1.8.4
>
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