console: add user console daemon

This adds a first draft of systemd-consoled. This is still missing a lot
of features and does some rather primitive rendering. However, it shows
the direction this code is going and serves as basis for further testing.

The systemd-consoled binary should be run as `systemd --user' unit. It
automatically picks up any session marked as Desktop=SYSTEMD-CONSOLE.
Therefore, you can use any login-manager you want (ranging from /bin/login
to gdm) to create sessions for systemd-consoled. However, the sessions
managers must be prepared to set the Desktop= variable properly.

The user-session is called `systemd-console', only the daemon providing
the terminal environment is called `systemd-consoled' (mind the 'd').

So far, only a single terminal session is provided on each opened
user-session. However, we support multiple user-sessions (even across
multiple seats) just fine. In the future, the workspace logic will get
extended so you can have multiple terminal sessions in a single
user-session for easier access.

Note that this is still experimental! Instructions on how to run it will
follow shortly.

.gitignore

@@ -60,6 +60,7 @@
 /systemd-cgls
 /systemd-cgroups-agent
 /systemd-cgtop
+/systemd-consoled
 /systemd-coredump
 /systemd-cryptsetup
 /systemd-cryptsetup-generator

Makefile.am

@@ -3020,6 +3020,9 @@ if ENABLE_TERMINAL
 noinst_LTLIBRARIES += \
 	libsystemd-terminal.la
 
+bin_PROGRAMS += \
+	systemd-consoled
+
 noinst_PROGRAMS += \
 	systemd-evcat \
 	systemd-modeset \
@@ -3068,6 +3071,25 @@ libsystemd_terminal_la_LIBADD = \
 	libsystemd-shared.la \
 	$(TERMINAL_LIBS)
 
+systemd_consoled_CFLAGS = \
+	$(AM_CFLAGS) \
+	$(TERMINAL_CFLAGS)
+
+systemd_consoled_SOURCES = \
+	src/console/consoled.h \
+	src/console/consoled.c \
+	src/console/consoled-display.c \
+	src/console/consoled-manager.c \
+	src/console/consoled-session.c \
+	src/console/consoled-terminal.c \
+	src/console/consoled-workspace.c
+
+systemd_consoled_LDADD = \
+	libsystemd-terminal.la \
+	libsystemd-internal.la \
+	libsystemd-shared.la \
+	$(TERMINAL_LIBS)
+
 systemd_evcat_CFLAGS = \
 	$(AM_CFLAGS) \
 	$(TERMINAL_CFLAGS)

src/console/Makefile

@@ -0,0 +1 @@
+../Makefile

src/console/consoled-display.c

@@ -0,0 +1,82 @@
+/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
+
+/***
+  This file is part of systemd.
+
+  Copyright 2014 David Herrmann <dh.herrmann@gmail.com>
+
+  systemd is free software; you can redistribute it and/or modify it
+  under the terms of the GNU Lesser General Public License as published by
+  the Free Software Foundation; either version 2.1 of the License, or
+  (at your option) any later version.
+
+  systemd is distributed in the hope that it will be useful, but
+  WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+  Lesser General Public License for more details.
+
+  You should have received a copy of the GNU Lesser General Public License
+  along with systemd; If not, see <http://www.gnu.org/licenses/>.
+***/
+
+#include <errno.h>
+#include <inttypes.h>
+#include <stdlib.h>
+#include "consoled.h"
+#include "grdev.h"
+#include "list.h"
+#include "macro.h"
+#include "util.h"
+
+int display_new(Display **out, Session *s, grdev_display *display) {
+        _cleanup_(display_freep) Display *d = NULL;
+
+        assert(out);
+        assert(s);
+        assert(display);
+
+        d = new0(Display, 1);
+        if (!d)
+                return -ENOMEM;
+
+        d->session = s;
+        d->grdev = display;
+        d->width = grdev_display_get_width(display);
+        d->height = grdev_display_get_height(display);
+        LIST_PREPEND(displays_by_session, d->session->display_list, d);
+
+        grdev_display_enable(display);
+
+        *out = d;
+        d = NULL;
+        return 0;
+}
+
+Display *display_free(Display *d) {
+        if (!d)
+                return NULL;
+
+        LIST_REMOVE(displays_by_session, d->session->display_list, d);
+        free(d);
+
+        return NULL;
+}
+
+void display_refresh(Display *d) {
+        assert(d);
+
+        d->width = grdev_display_get_width(d->grdev);
+        d->height = grdev_display_get_height(d->grdev);
+}
+
+void display_render(Display *d, Workspace *w) {
+        const grdev_display_target *target;
+
+        assert(d);
+        assert(w);
+
+        GRDEV_DISPLAY_FOREACH_TARGET(d->grdev, target) {
+                if (workspace_draw(w, target))
+                        grdev_display_flip_target(d->grdev, target);
+        }
+}

src/console/consoled-manager.c

@@ -0,0 +1,288 @@
+/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
+
+/***
+  This file is part of systemd.
+
+  Copyright 2014 David Herrmann <dh.herrmann@gmail.com>
+
+  systemd is free software; you can redistribute it and/or modify it
+  under the terms of the GNU Lesser General Public License as published by
+  the Free Software Foundation; either version 2.1 of the License, or
+  (at your option) any later version.
+
+  systemd is distributed in the hope that it will be useful, but
+  WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+  Lesser General Public License for more details.
+
+  You should have received a copy of the GNU Lesser General Public License
+  along with systemd; If not, see <http://www.gnu.org/licenses/>.
+***/
+
+#include <errno.h>
+#include <libudev.h>
+#include <stdlib.h>
+#include <string.h>
+#include "consoled.h"
+#include "grdev.h"
+#include "idev.h"
+#include "log.h"
+#include "sd-bus.h"
+#include "sd-daemon.h"
+#include "sd-event.h"
+#include "sd-login.h"
+#include "sysview.h"
+#include "unifont.h"
+#include "util.h"
+
+int manager_new(Manager **out) {
+        _cleanup_(manager_freep) Manager *m = NULL;
+        int r;
+
+        assert(out);
+
+        m = new0(Manager, 1);
+        if (!m)
+                return -ENOMEM;
+
+        r = sd_event_default(&m->event);
+        if (r < 0)
+                return r;
+
+        r = sd_event_set_watchdog(m->event, true);
+        if (r < 0)
+                return r;
+
+        r = sigprocmask_many(SIG_BLOCK, SIGTERM, SIGQUIT, SIGINT, SIGWINCH, SIGCHLD, -1);
+        if (r < 0)
+                return r;
+
+        r = sd_event_add_signal(m->event, NULL, SIGTERM, NULL, NULL);
+        if (r < 0)
+                return r;
+
+        r = sd_event_add_signal(m->event, NULL, SIGQUIT, NULL, NULL);
+        if (r < 0)
+                return r;
+
+        r = sd_event_add_signal(m->event, NULL, SIGINT, NULL, NULL);
+        if (r < 0)
+                return r;
+
+        r = sd_bus_open_system(&m->sysbus);
+        if (r < 0)
+                return r;
+
+        r = sd_bus_attach_event(m->sysbus, m->event, SD_EVENT_PRIORITY_NORMAL);
+        if (r < 0)
+                return r;
+
+        r = unifont_new(&m->uf);
+        if (r < 0)
+                return r;
+
+        r = sysview_context_new(&m->sysview,
+                                SYSVIEW_CONTEXT_SCAN_LOGIND |
+                                SYSVIEW_CONTEXT_SCAN_EVDEV |
+                                SYSVIEW_CONTEXT_SCAN_DRM,
+                                m->event,
+                                m->sysbus,
+                                NULL);
+        if (r < 0)
+                return r;
+
+        r = grdev_context_new(&m->grdev, m->event, m->sysbus);
+        if (r < 0)
+                return r;
+
+        r = idev_context_new(&m->idev, m->event, m->sysbus);
+        if (r < 0)
+                return r;
+
+        *out = m;
+        m = NULL;
+        return 0;
+}
+
+Manager *manager_free(Manager *m) {
+        if (!m)
+                return NULL;
+
+        assert(!m->workspace_list);
+
+        m->idev = idev_context_unref(m->idev);
+        m->grdev = grdev_context_unref(m->grdev);
+        m->sysview = sysview_context_free(m->sysview);
+        m->uf = unifont_unref(m->uf);
+        m->sysbus = sd_bus_unref(m->sysbus);
+        m->event = sd_event_unref(m->event);
+        free(m);
+
+        return NULL;
+}
+
+static int manager_sysview_session_filter(Manager *m, sysview_event *event) {
+        const char *sid = event->session_filter.id;
+        _cleanup_free_ char *desktop = NULL;
+        int r;
+
+        assert(sid);
+
+        r = sd_session_get_desktop(sid, &desktop);
+        if (r < 0)
+                return 0;
+
+        return streq(desktop, "SYSTEMD-CONSOLE");
+}
+
+static int manager_sysview_session_add(Manager *m, sysview_event *event) {
+        sysview_session *session = event->session_add.session;
+        Session *s;
+        int r;
+
+        r = sysview_session_take_control(session);
+        if (r < 0) {
+                log_error("Cannot request session control on '%s': %s",
+                          sysview_session_get_name(session), strerror(-r));
+                return r;
+        }
+
+        r = session_new(&s, m, session);
+        if (r < 0) {
+                log_error("Cannot create session on '%s': %s",
+                          sysview_session_get_name(session), strerror(-r));
+                sysview_session_release_control(session);
+                return r;
+        }
+
+        sysview_session_set_userdata(session, s);
+
+        return 0;
+}
+
+static int manager_sysview_session_remove(Manager *m, sysview_event *event) {
+        sysview_session *session = event->session_remove.session;
+        Session *s;
+
+        s = sysview_session_get_userdata(session);
+        if (!s)
+                return 0;
+
+        session_free(s);
+
+        return 0;
+}
+
+static int manager_sysview_session_attach(Manager *m, sysview_event *event) {
+        sysview_session *session = event->session_attach.session;
+        sysview_device *device = event->session_attach.device;
+        Session *s;
+
+        s = sysview_session_get_userdata(session);
+        if (!s)
+                return 0;
+
+        session_add_device(s, device);
+
+        return 0;
+}
+
+static int manager_sysview_session_detach(Manager *m, sysview_event *event) {
+        sysview_session *session = event->session_detach.session;
+        sysview_device *device = event->session_detach.device;
+        Session *s;
+
+        s = sysview_session_get_userdata(session);
+        if (!s)
+                return 0;
+
+        session_remove_device(s, device);
+
+        return 0;
+}
+
+static int manager_sysview_session_refresh(Manager *m, sysview_event *event) {
+        sysview_session *session = event->session_refresh.session;
+        sysview_device *device = event->session_refresh.device;
+        struct udev_device *ud = event->session_refresh.ud;
+        Session *s;
+
+        s = sysview_session_get_userdata(session);
+        if (!s)
+                return 0;
+
+        session_refresh_device(s, device, ud);
+
+        return 0;
+}
+
+static int manager_sysview_session_control(Manager *m, sysview_event *event) {
+        sysview_session *session = event->session_control.session;
+        int error = event->session_control.error;
+        Session *s;
+
+        s = sysview_session_get_userdata(session);
+        if (!s)
+                return 0;
+
+        if (error < 0) {
+                log_error("Cannot take session control on '%s': %s",
+                          sysview_session_get_name(session), strerror(-error));
+                session_free(s);
+                sysview_session_set_userdata(session, NULL);
+                return -error;
+        }
+
+        return 0;
+}
+
+static int manager_sysview_fn(sysview_context *sysview, void *userdata, sysview_event *event) {
+        Manager *m = userdata;
+        int r;
+
+        assert(m);
+
+        switch (event->type) {
+        case SYSVIEW_EVENT_SESSION_FILTER:
+                r = manager_sysview_session_filter(m, event);
+                break;
+        case SYSVIEW_EVENT_SESSION_ADD:
+                r = manager_sysview_session_add(m, event);
+                break;
+        case SYSVIEW_EVENT_SESSION_REMOVE:
+                r = manager_sysview_session_remove(m, event);
+                break;
+        case SYSVIEW_EVENT_SESSION_ATTACH:
+                r = manager_sysview_session_attach(m, event);
+                break;
+        case SYSVIEW_EVENT_SESSION_DETACH:
+                r = manager_sysview_session_detach(m, event);
+                break;
+        case SYSVIEW_EVENT_SESSION_REFRESH:
+                r = manager_sysview_session_refresh(m, event);
+                break;
+        case SYSVIEW_EVENT_SESSION_CONTROL:
+                r = manager_sysview_session_control(m, event);
+                break;
+        default:
+                r = 0;
+                break;
+        }
+
+        return r;
+}
+
+int manager_run(Manager *m) {
+        int r;
+
+        assert(m);
+
+        r = sysview_context_start(m->sysview, manager_sysview_fn, m);
+        if (r < 0)
+                return r;
+
+        r = sd_event_loop(m->event);
+
+        sysview_context_stop(m->sysview);
+        return r;
+}

src/console/consoled-session.c

@@ -0,0 +1,283 @@
+/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
+
+/***
+  This file is part of systemd.
+
+  Copyright 2014 David Herrmann <dh.herrmann@gmail.com>
+
+  systemd is free software; you can redistribute it and/or modify it
+  under the terms of the GNU Lesser General Public License as published by
+  the Free Software Foundation; either version 2.1 of the License, or
+  (at your option) any later version.
+
+  systemd is distributed in the hope that it will be useful, but
+  WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+  Lesser General Public License for more details.
+
+  You should have received a copy of the GNU Lesser General Public License
+  along with systemd; If not, see <http://www.gnu.org/licenses/>.
+***/
+
+#include <errno.h>
+#include <inttypes.h>
+#include <libudev.h>
+#include <stdlib.h>
+#include "consoled.h"
+#include "grdev.h"
+#include "hashmap.h"
+#include "idev.h"
+#include "list.h"
+#include "macro.h"
+#include "sd-bus.h"
+#include "sd-event.h"
+#include "sysview.h"
+#include "util.h"
+
+static bool session_feed_keyboard(Session *s, idev_data *data) {
+        idev_data_keyboard *kdata = &data->keyboard;
+
+        if (!data->resync && kdata->value == 1 && kdata->n_syms == 1) {
+                uint32_t nr;
+                sysview_seat *seat;
+
+                /* handle VT-switch requests */
+                nr = 0;
+
+                switch (kdata->keysyms[0]) {
+                case XKB_KEY_F1 ... XKB_KEY_F12:
+                        if (IDEV_KBDMATCH(kdata,
+                                          IDEV_KBDMOD_CTRL | IDEV_KBDMOD_ALT,
+                                          kdata->keysyms[0]))
+                                nr = kdata->keysyms[0] - XKB_KEY_F1 + 1;
+                        break;
+                case XKB_KEY_XF86Switch_VT_1 ... XKB_KEY_XF86Switch_VT_12:
+                        nr = kdata->keysyms[0] - XKB_KEY_XF86Switch_VT_1 + 1;
+                        break;
+                }
+
+                if (nr != 0) {
+                        seat = sysview_session_get_seat(s->sysview);
+                        sysview_seat_switch_to(seat, nr);
+                        return true;
+                }
+        }
+
+        return false;
+}
+
+static bool session_feed(Session *s, idev_data *data) {
+        switch (data->type) {
+        case IDEV_DATA_KEYBOARD:
+                return session_feed_keyboard(s, data);
+        default:
+                return false;
+        }
+}
+
+static int session_idev_fn(idev_session *idev, void *userdata, idev_event *event) {
+        Session *s = userdata;
+
+        switch (event->type) {
+        case IDEV_EVENT_DEVICE_ADD:
+                idev_device_enable(event->device_add.device);
+                break;
+        case IDEV_EVENT_DEVICE_REMOVE:
+                idev_device_disable(event->device_remove.device);
+                break;
+        case IDEV_EVENT_DEVICE_DATA:
+                if (!session_feed(s, &event->device_data.data))
+                        workspace_feed(s->active_ws, &event->device_data.data);
+                break;
+        }
+
+        return 0;
+}
+
+static void session_grdev_fn(grdev_session *grdev, void *userdata, grdev_event *event) {
+        grdev_display *display;
+        Session *s = userdata;
+        Display *d;
+        int r;
+
+        switch (event->type) {
+        case GRDEV_EVENT_DISPLAY_ADD:
+                display = event->display_add.display;
+
+                r = display_new(&d, s, display);
+                if (r < 0) {
+                        log_error("Cannot create display '%s' on '%s': %s",
+                                  grdev_display_get_name(display), sysview_session_get_name(s->sysview), strerror(-r));
+                        break;
+                }
+
+                grdev_display_set_userdata(display, d);
+                workspace_refresh(s->active_ws);
+                break;
+        case GRDEV_EVENT_DISPLAY_REMOVE:
+                display = event->display_remove.display;
+                d = grdev_display_get_userdata(display);
+                if (!d)
+                        break;
+
+                display_free(d);
+                workspace_refresh(s->active_ws);
+                break;
+        case GRDEV_EVENT_DISPLAY_CHANGE:
+                display = event->display_remove.display;
+                d = grdev_display_get_userdata(display);
+                if (!d)
+                        break;
+
+                display_refresh(d);
+                workspace_refresh(s->active_ws);
+                break;
+        case GRDEV_EVENT_DISPLAY_FRAME:
+                display = event->display_remove.display;
+                d = grdev_display_get_userdata(display);
+                if (!d)
+                        break;
+
+                session_dirty(s);
+                break;
+        }
+}
+
+static int session_redraw_fn(sd_event_source *src, void *userdata) {
+        Session *s = userdata;
+        Display *d;
+
+        LIST_FOREACH(displays_by_session, d, s->display_list)
+                display_render(d, s->active_ws);
+
+        grdev_session_commit(s->grdev);
+
+        return 0;
+}
+
+int session_new(Session **out, Manager *m, sysview_session *session) {
+        _cleanup_(session_freep) Session *s = NULL;
+        int r;
+
+        assert(out);
+        assert(m);
+        assert(session);
+
+        s = new0(Session, 1);
+        if (!s)
+                return -ENOMEM;
+
+        s->manager = m;
+        s->sysview = session;
+
+        r = grdev_session_new(&s->grdev,
+                              m->grdev,
+                              GRDEV_SESSION_MANAGED,
+                              sysview_session_get_name(session),
+                              session_grdev_fn,
+                              s);
+        if (r < 0)
+                return r;
+
+        r = idev_session_new(&s->idev,
+                             m->idev,
+                             IDEV_SESSION_MANAGED,
+                             sysview_session_get_name(session),
+                             session_idev_fn,
+                             s);
+        if (r < 0)
+                return r;
+
+        r = workspace_new(&s->my_ws, m);
+        if (r < 0)
+                return r;
+
+        s->active_ws = workspace_attach(s->my_ws, s);
+
+        r = sd_event_add_defer(m->event, &s->redraw_src, session_redraw_fn, s);
+        if (r < 0)
+                return r;
+
+        grdev_session_enable(s->grdev);
+        idev_session_enable(s->idev);
+
+        *out = s;
+        s = NULL;
+        return 0;
+}
+
+Session *session_free(Session *s) {
+        if (!s)
+                return NULL;
+
+        assert(!s->display_list);
+
+        sd_event_source_unref(s->redraw_src);
+
+        workspace_detach(s->active_ws, s);
+        workspace_unref(s->my_ws);
+
+        idev_session_free(s->idev);
+        grdev_session_free(s->grdev);
+        free(s);
+
+        return NULL;
+}
+
+void session_dirty(Session *s) {
+        int r;
+
+        assert(s);
+
+        r = sd_event_source_set_enabled(s->redraw_src, SD_EVENT_ONESHOT);
+        if (r < 0)
+                log_error("Cannot enable redraw-source: %s", strerror(-r));
+}
+
+void session_add_device(Session *s, sysview_device *device) {
+        unsigned int type;
+
+        assert(s);
+        assert(device);
+
+        type = sysview_device_get_type(device);
+        switch (type) {
+        case SYSVIEW_DEVICE_DRM:
+                grdev_session_add_drm(s->grdev, sysview_device_get_ud(device));
+                break;
+        case SYSVIEW_DEVICE_EVDEV:
+                idev_session_add_evdev(s->idev, sysview_device_get_ud(device));
+                break;
+        }
+}
+
+void session_remove_device(Session *s, sysview_device *device) {
+        unsigned int type;
+
+        assert(s);
+        assert(device);
+
+        type = sysview_device_get_type(device);
+        switch (type) {
+        case SYSVIEW_DEVICE_DRM:
+                grdev_session_remove_drm(s->grdev, sysview_device_get_ud(device));
+                break;
+        case SYSVIEW_DEVICE_EVDEV:
+                idev_session_remove_evdev(s->idev, sysview_device_get_ud(device));
+                break;
+        }
+}
+
+void session_refresh_device(Session *s, sysview_device *device, struct udev_device *ud) {
+        unsigned int type;
+
+        assert(s);
+        assert(device);
+
+        type = sysview_device_get_type(device);
+        switch (type) {
+        case SYSVIEW_DEVICE_DRM:
+                grdev_session_hotplug_drm(s->grdev, sysview_device_get_ud(device));
+                break;
+        }
+}

src/console/consoled-terminal.c

@@ -0,0 +1,360 @@
+/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
+
+/***
+  This file is part of systemd.
+
+  Copyright 2014 David Herrmann <dh.herrmann@gmail.com>
+
+  systemd is free software; you can redistribute it and/or modify it
+  under the terms of the GNU Lesser General Public License as published by
+  the Free Software Foundation; either version 2.1 of the License, or
+  (at your option) any later version.
+
+  systemd is distributed in the hope that it will be useful, but
+  WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+  Lesser General Public License for more details.
+
+  You should have received a copy of the GNU Lesser General Public License
+  along with systemd; If not, see <http://www.gnu.org/licenses/>.
+***/
+
+#include <errno.h>
+#include <inttypes.h>
+#include <stdlib.h>
+#include "consoled.h"
+#include "list.h"
+#include "macro.h"
+#include "util.h"
+
+static int terminal_write_fn(term_screen *screen, void *userdata, const void *buf, size_t size) {
+        Terminal *t = userdata;
+        int r;
+
+        if (t->pty) {
+                r = pty_write(t->pty, buf, size);
+                if (r < 0)
+                        return log_oom();
+        }
+
+        return 0;
+}
+
+static int terminal_pty_fn(Pty *pty, void *userdata, unsigned int event, const void *ptr, size_t size) {
+        Terminal *t = userdata;
+        int r;
+
+        switch (event) {
+        case PTY_CHILD:
+                log_debug("PTY child exited");
+                t->pty = pty_unref(t->pty);
+                break;
+        case PTY_DATA:
+                r = term_screen_feed_text(t->screen, ptr, size);
+                if (r < 0)
+                        log_error("Cannot update screen state: %s", strerror(-r));
+
+                workspace_dirty(t->workspace);
+                break;
+        }
+
+        return 0;
+}
+
+int terminal_new(Terminal **out, Workspace *w) {
+        _cleanup_(terminal_freep) Terminal *t = NULL;
+        int r;
+
+        assert(w);
+
+        t = new0(Terminal, 1);
+        if (!t)
+                return -ENOMEM;
+
+        t->workspace = w;
+        LIST_PREPEND(terminals_by_workspace, w->terminal_list, t);
+
+        r = term_parser_new(&t->parser, true);
+        if (r < 0)
+                return r;
+
+        r = term_screen_new(&t->screen, terminal_write_fn, t, NULL, NULL);
+        if (r < 0)
+                return r;
+
+        r = term_screen_set_answerback(t->screen, "systemd-console");
+        if (r < 0)
+                return r;
+
+        if (out)
+                *out = t;
+        t = NULL;
+        return 0;
+}
+
+Terminal *terminal_free(Terminal *t) {
+        if (!t)
+                return NULL;
+
+        assert(t->workspace);
+
+        if (t->pty) {
+                (void)pty_signal(t->pty, SIGHUP);
+                pty_close(t->pty);
+                pty_unref(t->pty);
+        }
+        term_screen_unref(t->screen);
+        term_parser_free(t->parser);
+        LIST_REMOVE(terminals_by_workspace, t->workspace->terminal_list, t);
+        free(t);
+
+        return NULL;
+}
+
+void terminal_resize(Terminal *t) {
+        uint32_t width, height, fw, fh;
+        int r;
+
+        assert(t);
+
+        width = t->workspace->width;
+        height = t->workspace->height;
+        fw = unifont_get_width(t->workspace->manager->uf);
+        fh = unifont_get_height(t->workspace->manager->uf);
+
+        width = (fw > 0) ? width / fw : 0;
+        height = (fh > 0) ? height / fh : 0;
+
+        if (t->pty) {
+                r = pty_resize(t->pty, width, height);
+                if (r < 0)
+                        log_error("Cannot resize pty: %s", strerror(-r));
+        }
+
+        r = term_screen_resize(t->screen, width, height);
+        if (r < 0)
+                log_error("Cannot resize screen: %s", strerror(-r));
+}
+
+void terminal_run(Terminal *t) {
+        pid_t pid;
+
+        assert(t);
+
+        if (t->pty)
+                return;
+
+        pid = pty_fork(&t->pty,
+                       t->workspace->manager->event,
+                       terminal_pty_fn,
+                       t,
+                       term_screen_get_width(t->screen),
+                       term_screen_get_height(t->screen));
+        if (pid < 0) {
+                log_error("Cannot fork PTY: %s", strerror(-pid));
+                return;
+        } else if (pid == 0) {
+                /* child */
+
+                char **argv = (char*[]){
+                        (char*)getenv("SHELL") ? : (char*)_PATH_BSHELL,
+                        NULL
+                };
+
+                setenv("TERM", "xterm-256color", 1);
+                setenv("COLORTERM", "systemd-console", 1);
+
+                execve(argv[0], argv, environ);
+                log_error("Cannot exec %s (%d): %m", argv[0], -errno);
+                _exit(1);
+        }
+}
+
+static void terminal_feed_keyboard(Terminal *t, idev_data *data) {
+        idev_data_keyboard *kdata = &data->keyboard;
+        int r;
+
+        if (!data->resync && (kdata->value == 1 || kdata->value == 2)) {
+                assert_cc(TERM_KBDMOD_CNT == (int)IDEV_KBDMOD_CNT);
+                assert_cc(TERM_KBDMOD_IDX_SHIFT == (int)IDEV_KBDMOD_IDX_SHIFT &&
+                          TERM_KBDMOD_IDX_CTRL == (int)IDEV_KBDMOD_IDX_CTRL &&
+                          TERM_KBDMOD_IDX_ALT == (int)IDEV_KBDMOD_IDX_ALT &&
+                          TERM_KBDMOD_IDX_LINUX == (int)IDEV_KBDMOD_IDX_LINUX &&
+                          TERM_KBDMOD_IDX_CAPS == (int)IDEV_KBDMOD_IDX_CAPS);
+
+                r = term_screen_feed_keyboard(t->screen,
+                                              kdata->keysyms,
+                                              kdata->n_syms,
+                                              kdata->ascii,
+                                              kdata->codepoints,
+                                              kdata->mods);
+                if (r < 0)
+                        log_error("Cannot feed keyboard data to screen: %s",
+                                  strerror(-r));
+        }
+}
+
+void terminal_feed(Terminal *t, idev_data *data) {
+        switch (data->type) {
+        case IDEV_DATA_KEYBOARD:
+                terminal_feed_keyboard(t, data);
+                break;
+        }
+}
+
+static void terminal_fill(uint8_t *dst,
+                          uint32_t width,
+                          uint32_t height,
+                          uint32_t stride,
+                          uint32_t value) {
+        uint32_t i, j, *px;
+
+        for (j = 0; j < height; ++j) {
+                px = (uint32_t*)dst;
+
+                for (i = 0; i < width; ++i)
+                        *px++ = value;
+
+                dst += stride;
+        }
+}
+
+static void terminal_blend(uint8_t *dst,
+                           uint32_t width,
+                           uint32_t height,
+                           uint32_t dst_stride,
+                           const uint8_t *src,
+                           uint32_t src_stride,
+                           uint32_t fg,
+                           uint32_t bg) {
+        uint32_t i, j, *px;
+
+        for (j = 0; j < height; ++j) {
+                px = (uint32_t*)dst;
+
+                for (i = 0; i < width; ++i) {
+                        if (!src || src[i / 8] & (1 << (7 - i % 8)))
+                                *px = fg;
+                        else
+                                *px = bg;
+
+                        ++px;
+                }
+
+                src += src_stride;
+                dst += dst_stride;
+        }
+}
+
+typedef struct {
+        const grdev_display_target *target;
+        unifont *uf;
+        uint32_t cell_width;
+        uint32_t cell_height;
+        bool dirty;
+} TerminalDrawContext;
+
+static int terminal_draw_cell(term_screen *screen,
+                              void *userdata,
+                              unsigned int x,
+                              unsigned int y,
+                              const term_attr *attr,
+                              const uint32_t *ch,
+                              size_t n_ch,
+                              unsigned int ch_width) {
+        TerminalDrawContext *ctx = userdata;
+        const grdev_display_target *target = ctx->target;
+        grdev_fb *fb = target->back;
+        uint32_t xpos, ypos, width, height;
+        uint32_t fg, bg;
+        unifont_glyph g;
+        uint8_t *dst;
+        int r;
+
+        if (n_ch > 0) {
+                r = unifont_lookup(ctx->uf, &g, *ch);
+                if (r < 0)
+                        r = unifont_lookup(ctx->uf, &g, 0xfffd);
+                if (r < 0)
+                        unifont_fallback(&g);
+        }
+
+        xpos = x * ctx->cell_width;
+        ypos = y * ctx->cell_height;
+
+        if (xpos >= fb->width || ypos >= fb->height)
+                return 0;
+
+        width = MIN(fb->width - xpos, ctx->cell_width * ch_width);
+        height = MIN(fb->height - ypos, ctx->cell_height);
+
+        term_attr_to_argb32(attr, &fg, &bg, NULL);
+
+        ctx->dirty = true;
+
+        dst = fb->maps[0];
+        dst += fb->strides[0] * ypos + sizeof(uint32_t) * xpos;
+
+        if (n_ch < 1) {
+                terminal_fill(dst,
+                              width,
+                              height,
+                              fb->strides[0],
+                              bg);
+        } else {
+                if (width > g.width)
+                        terminal_fill(dst + sizeof(uint32_t) * g.width,
+                                      width - g.width,
+                                      height,
+                                      fb->strides[0],
+                                      bg);
+                if (height > g.height)
+                        terminal_fill(dst + fb->strides[0] * g.height,
+                                      width,
+                                      height - g.height,
+                                      fb->strides[0],
+                                      bg);
+
+                terminal_blend(dst,
+                               width,
+                               height,
+                               fb->strides[0],
+                               g.data,
+                               g.stride,
+                               fg,
+                               bg);
+        }
+
+        return 0;
+}
+
+bool terminal_draw(Terminal *t, const grdev_display_target *target) {
+        TerminalDrawContext ctx = { };
+        uint64_t age;
+
+        assert(t);
+        assert(target);
+
+        /* start up terminal on first frame */
+        terminal_run(t);
+
+        ctx.target = target;
+        ctx.uf = t->workspace->manager->uf;
+        ctx.cell_width = unifont_get_width(ctx.uf);
+        ctx.cell_height = unifont_get_height(ctx.uf);
+        ctx.dirty = false;
+
+        if (target->front) {
+                /* if the frontbuffer is new enough, no reason to redraw */
+                age = term_screen_get_age(t->screen);
+                if (age != 0 && age <= target->front->data.u64)
+                        return false;
+        } else {
+                /* force flip if no frontbuffer is set, yet */
+                ctx.dirty = true;
+        }
+
+        term_screen_draw(t->screen, terminal_draw_cell, &ctx, &target->back->data.u64);
+
+        return ctx.dirty;
+}

src/console/consoled-workspace.c

@@ -0,0 +1,168 @@
+/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
+
+/***
+  This file is part of systemd.
+
+  Copyright 2014 David Herrmann <dh.herrmann@gmail.com>
+
+  systemd is free software; you can redistribute it and/or modify it
+  under the terms of the GNU Lesser General Public License as published by
+  the Free Software Foundation; either version 2.1 of the License, or
+  (at your option) any later version.
+
+  systemd is distributed in the hope that it will be useful, but
+  WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+  Lesser General Public License for more details.
+
+  You should have received a copy of the GNU Lesser General Public License
+  along with systemd; If not, see <http://www.gnu.org/licenses/>.
+***/
+
+#include <errno.h>
+#include <inttypes.h>
+#include <stdlib.h>
+#include "consoled.h"
+#include "grdev.h"
+#include "idev.h"
+#include "list.h"
+#include "macro.h"
+#include "util.h"
+
+int workspace_new(Workspace **out, Manager *m) {
+        _cleanup_(workspace_unrefp) Workspace *w = NULL;
+        int r;
+
+        assert(out);
+
+        w = new0(Workspace, 1);
+        if (!w)
+                return -ENOMEM;
+
+        w->ref = 1;
+        w->manager = m;
+        LIST_PREPEND(workspaces_by_manager, m->workspace_list, w);
+
+        r = terminal_new(&w->current, w);
+        if (r < 0)
+                return r;
+
+        *out = w;
+        w = NULL;
+        return 0;
+}
+
+static void workspace_cleanup(Workspace *w) {
+        Terminal *t;
+
+        assert(w);
+        assert(w->ref == 0);
+        assert(w->manager);
+        assert(!w->session_list);
+
+        w->current = NULL;
+        while ((t = w->terminal_list))
+                terminal_free(t);
+
+        LIST_REMOVE(workspaces_by_manager, w->manager->workspace_list, w);
+        free(w);
+}
+
+Workspace *workspace_ref(Workspace *w) {
+        assert(w);
+
+        ++w->ref;
+        return w;
+}
+
+Workspace *workspace_unref(Workspace *w) {
+        if (!w)
+                return NULL;
+
+        assert(w->ref > 0);
+
+        if (--w->ref == 0)
+                workspace_cleanup(w);
+
+        return NULL;
+}
+
+Workspace *workspace_attach(Workspace *w, Session *s) {
+        assert(w);
+        assert(s);
+
+        LIST_PREPEND(sessions_by_workspace, w->session_list, s);
+        workspace_refresh(w);
+        return workspace_ref(w);
+}
+
+Workspace *workspace_detach(Workspace *w, Session *s) {
+        assert(w);
+        assert(s);
+        assert(s->active_ws == w);
+
+        LIST_REMOVE(sessions_by_workspace, w->session_list, s);
+        workspace_refresh(w);
+        return workspace_unref(w);
+}
+
+void workspace_refresh(Workspace *w) {
+        uint32_t width, height;
+        Terminal *t;
+        Session *s;
+        Display *d;
+
+        assert(w);
+
+        width = 0;
+        height = 0;
+
+        /* find out minimum dimension of all attached displays */
+        LIST_FOREACH(sessions_by_workspace, s, w->session_list) {
+                LIST_FOREACH(displays_by_session, d, s->display_list) {
+                        assert(d->width > 0 && d->height > 0);
+
+                        if (width == 0 || d->width < width)
+                                width = d->width;
+                        if (height == 0 || d->height < height)
+                                height = d->height;
+                }
+        }
+
+        /* either both are zero, or none is zero */
+        assert(!(!width ^ !height));
+
+        /* update terminal-sizes if dimensions changed */
+        if (w->width != width || w->height != height) {
+                w->width = width;
+                w->height = height;
+
+                LIST_FOREACH(terminals_by_workspace, t, w->terminal_list)
+                        terminal_resize(t);
+
+                workspace_dirty(w);
+        }
+}
+
+void workspace_dirty(Workspace *w) {
+        Session *s;
+
+        assert(w);
+
+        LIST_FOREACH(sessions_by_workspace, s, w->session_list)
+                session_dirty(s);
+}
+
+void workspace_feed(Workspace *w, idev_data *data) {
+        assert(w);
+        assert(data);
+
+        terminal_feed(w->current, data);
+}
+
+bool workspace_draw(Workspace *w, const grdev_display_target *target) {
+        assert(w);
+        assert(target);
+
+        return terminal_draw(w->current, target);
+}

src/console/consoled.c

@@ -0,0 +1,67 @@
+/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
+
+/***
+  This file is part of systemd.
+
+  Copyright 2014 David Herrmann <dh.herrmann@gmail.com>
+
+  systemd is free software; you can redistribute it and/or modify it
+  under the terms of the GNU Lesser General Public License as published by
+  the Free Software Foundation; either version 2.1 of the License, or
+  (at your option) any later version.
+
+  systemd is distributed in the hope that it will be useful, but
+  WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+  Lesser General Public License for more details.
+
+  You should have received a copy of the GNU Lesser General Public License
+  along with systemd; If not, see <http://www.gnu.org/licenses/>.
+***/
+
+#include <errno.h>
+#include <stdlib.h>
+#include <string.h>
+#include "consoled.h"
+#include "log.h"
+#include "sd-daemon.h"
+#include "util.h"
+
+int main(int argc, char *argv[]) {
+        _cleanup_(manager_freep) Manager *m = NULL;
+        int r;
+
+        log_set_target(LOG_TARGET_AUTO);
+        log_parse_environment();
+        log_open();
+
+        umask(0022);
+
+        if (argc != 1) {
+                log_error("This program takes no arguments.");
+                r = -EINVAL;
+                goto out;
+        }
+
+        r = manager_new(&m);
+        if (r < 0) {
+                log_error("Could not create manager: %s", strerror(-r));
+                goto out;
+        }
+
+        sd_notify(false,
+                  "READY=1\n"
+                  "STATUS=Processing requests...");
+
+        r = manager_run(m);
+        if (r < 0) {
+                log_error("Cannot run manager: %s", strerror(-r));
+                goto out;
+        }
+
+out:
+        sd_notify(false,
+                  "STATUS=Shutting down...");
+
+        return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS;
+}

src/console/consoled.h

@@ -0,0 +1,170 @@
+/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
+
+#pragma once
+
+/***
+  This file is part of systemd.
+
+  Copyright 2014 David Herrmann <dh.herrmann@gmail.com>
+
+  systemd is free software; you can redistribute it and/or modify it
+  under the terms of the GNU Lesser General Public License as published by
+  the Free Software Foundation; either version 2.1 of the License, or
+  (at your option) any later version.
+
+  systemd is distributed in the hope that it will be useful, but
+  WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+  Lesser General Public License for more details.
+
+  You should have received a copy of the GNU Lesser General Public License
+  along with systemd; If not, see <http://www.gnu.org/licenses/>.
+***/
+
+#include <errno.h>
+#include <inttypes.h>
+#include <libudev.h>
+#include <stdlib.h>
+#include "grdev.h"
+#include "hashmap.h"
+#include "idev.h"
+#include "list.h"
+#include "macro.h"
+#include "pty.h"
+#include "sd-bus.h"
+#include "sd-event.h"
+#include "sysview.h"
+#include "term.h"
+#include "unifont.h"
+#include "util.h"
+
+typedef struct Manager Manager;
+typedef struct Session Session;
+typedef struct Display Display;
+typedef struct Workspace Workspace;
+typedef struct Terminal Terminal;
+
+/*
+ * Terminals
+ */
+
+struct Terminal {
+        Workspace *workspace;
+        LIST_FIELDS(Terminal, terminals_by_workspace);
+
+        term_utf8 utf8;
+        term_parser *parser;
+        term_screen *screen;
+        Pty *pty;
+};
+
+int terminal_new(Terminal **out, Workspace *w);
+Terminal *terminal_free(Terminal *t);
+
+DEFINE_TRIVIAL_CLEANUP_FUNC(Terminal*, terminal_free);
+
+void terminal_resize(Terminal *t);
+void terminal_run(Terminal *t);
+void terminal_feed(Terminal *t, idev_data *data);
+bool terminal_draw(Terminal *t, const grdev_display_target *target);
+
+/*
+ * Workspaces
+ */
+
+struct Workspace {
+        unsigned long ref;
+        Manager *manager;
+        LIST_FIELDS(Workspace, workspaces_by_manager);
+
+        LIST_HEAD(Terminal, terminal_list);
+        Terminal *current;
+
+        LIST_HEAD(Session, session_list);
+        uint32_t width;
+        uint32_t height;
+};
+
+int workspace_new(Workspace **out, Manager *m);
+Workspace *workspace_ref(Workspace *w);
+Workspace *workspace_unref(Workspace *w);
+
+DEFINE_TRIVIAL_CLEANUP_FUNC(Workspace*, workspace_unref);
+
+Workspace *workspace_attach(Workspace *w, Session *s);
+Workspace *workspace_detach(Workspace *w, Session *s);
+void workspace_refresh(Workspace *w);
+
+void workspace_dirty(Workspace *w);
+void workspace_feed(Workspace *w, idev_data *data);
+bool workspace_draw(Workspace *w, const grdev_display_target *target);
+
+/*
+ * Displays
+ */
+
+struct Display {
+        Session *session;
+        LIST_FIELDS(Display, displays_by_session);
+        grdev_display *grdev;
+        uint32_t width;
+        uint32_t height;
+};
+
+int display_new(Display **out, Session *s, grdev_display *grdev);
+Display *display_free(Display *d);
+
+DEFINE_TRIVIAL_CLEANUP_FUNC(Display*, display_free);
+
+void display_refresh(Display *d);
+void display_render(Display *d, Workspace *w);
+
+/*
+ * Sessions
+ */
+
+struct Session {
+        Manager *manager;
+        sysview_session *sysview;
+        grdev_session *grdev;
+        idev_session *idev;
+
+        LIST_FIELDS(Session, sessions_by_workspace);
+        Workspace *my_ws;
+        Workspace *active_ws;
+
+        LIST_HEAD(Display, display_list);
+        sd_event_source *redraw_src;
+};
+
+int session_new(Session **out, Manager *m, sysview_session *session);
+Session *session_free(Session *s);
+
+DEFINE_TRIVIAL_CLEANUP_FUNC(Session*, session_free);
+
+void session_dirty(Session *s);
+
+void session_add_device(Session *s, sysview_device *device);
+void session_remove_device(Session *s, sysview_device *device);
+void session_refresh_device(Session *s, sysview_device *device, struct udev_device *ud);
+
+/*
+ * Managers
+ */
+
+struct Manager {
+        sd_event *event;
+        sd_bus *sysbus;
+        unifont *uf;
+        sysview_context *sysview;
+        grdev_context *grdev;
+        idev_context *idev;
+        LIST_HEAD(Workspace, workspace_list);
+};
+
+int manager_new(Manager **out);
+Manager *manager_free(Manager *m);
+
+DEFINE_TRIVIAL_CLEANUP_FUNC(Manager*, manager_free);
+
+int manager_run(Manager *m);