***/
#include <errno.h>
+#include <fcntl.h>
+#include <linux/vt.h>
+#include <linux/kd.h>
+#include <signal.h>
#include <string.h>
+#include <sys/ioctl.h>
#include <unistd.h>
-#include <sys/epoll.h>
-#include <fcntl.h>
-
-#include <systemd/sd-id128.h>
-#include <systemd/sd-messages.h>
-#include "strv.h"
+#include "sd-messages.h"
#include "util.h"
#include "mkdir.h"
#include "path-util.h"
-#include "cgroup-util.h"
#include "fileio.h"
-#include "dbus-common.h"
+#include "audit.h"
+#include "bus-util.h"
+#include "bus-error.h"
#include "logind-session.h"
+#include "formats-util.h"
+#include "terminal-util.h"
+
+#define RELEASE_USEC (20*USEC_PER_SEC)
+
+static void session_remove_fifo(Session *s);
Session* session_new(Manager *m, const char *id) {
Session *s;
assert(m);
assert(id);
+ assert(session_id_valid(id));
s = new0(Session, 1);
if (!s)
return NULL;
}
- s->id = path_get_file_name(s->state_file);
+ s->devices = hashmap_new(&devt_hash_ops);
+ if (!s->devices) {
+ free(s->state_file);
+ free(s);
+ return NULL;
+ }
+
+ s->id = basename(s->state_file);
if (hashmap_put(m->sessions, s->id, s) < 0) {
+ hashmap_free(s->devices);
free(s->state_file);
free(s);
return NULL;
s->manager = m;
s->fifo_fd = -1;
+ s->vtfd = -1;
return s;
}
void session_free(Session *s) {
+ SessionDevice *sd;
+
assert(s);
if (s->in_gc_queue)
- LIST_REMOVE(Session, gc_queue, s->manager->session_gc_queue, s);
+ LIST_REMOVE(gc_queue, s->manager->session_gc_queue, s);
+
+ s->timer_event_source = sd_event_source_unref(s->timer_event_source);
+
+ session_remove_fifo(s);
+
+ session_drop_controller(s);
+
+ while ((sd = hashmap_first(s->devices)))
+ session_device_free(sd);
+
+ hashmap_free(s->devices);
if (s->user) {
- LIST_REMOVE(Session, sessions_by_user, s->user->sessions, s);
+ LIST_REMOVE(sessions_by_user, s->user->sessions, s);
if (s->user->display == s)
s->user->display = NULL;
if (s->seat) {
if (s->seat->active == s)
s->seat->active = NULL;
+ if (s->seat->pending_switch == s)
+ s->seat->pending_switch = NULL;
- LIST_REMOVE(Session, sessions_by_seat, s->seat->sessions, s);
+ seat_evict_position(s->seat, s);
+ LIST_REMOVE(sessions_by_seat, s->seat->sessions, s);
}
if (s->scope) {
free(s->scope_job);
- if (s->create_message)
- dbus_message_unref(s->create_message);
+ sd_bus_message_unref(s->create_message);
free(s->tty);
free(s->display);
free(s->remote_host);
free(s->remote_user);
free(s->service);
+ free(s->desktop);
hashmap_remove(s->manager->sessions, s->id);
- session_remove_fifo(s);
free(s->state_file);
free(s);
assert(!s->user);
s->user = u;
- LIST_PREPEND(Session, sessions_by_user, u->sessions, s);
+ LIST_PREPEND(sessions_by_user, u->sessions, s);
}
int session_save(Session *s) {
- _cleanup_fclose_ FILE *f = NULL;
_cleanup_free_ char *temp_path = NULL;
+ _cleanup_fclose_ FILE *f = NULL;
int r = 0;
assert(s);
r = mkdir_safe_label("/run/systemd/sessions", 0755, 0, 0);
if (r < 0)
- goto finish;
+ goto fail;
r = fopen_temporary(s->state_file, &f, &temp_path);
if (r < 0)
- goto finish;
+ goto fail;
assert(s->user);
fprintf(f,
"# This is private data. Do not parse.\n"
- "UID=%lu\n"
+ "UID="UID_FMT"\n"
"USER=%s\n"
"ACTIVE=%i\n"
"STATE=%s\n"
"REMOTE=%i\n",
- (unsigned long) s->user->uid,
+ s->user->uid,
s->user->name,
session_is_active(s),
session_state_to_string(session_get_state(s)),
if (s->scope)
fprintf(f, "SCOPE=%s\n", s->scope);
-
if (s->scope_job)
fprintf(f, "SCOPE_JOB=%s\n", s->scope_job);
if (s->display)
fprintf(f, "DISPLAY=%s\n", s->display);
- if (s->remote_host)
- fprintf(f, "REMOTE_HOST=%s\n", s->remote_host);
+ if (s->remote_host) {
+ _cleanup_free_ char *escaped;
+
+ escaped = cescape(s->remote_host);
+ if (!escaped) {
+ r = -ENOMEM;
+ goto fail;
+ }
+
+ fprintf(f, "REMOTE_HOST=%s\n", escaped);
+ }
+
+ if (s->remote_user) {
+ _cleanup_free_ char *escaped;
+
+ escaped = cescape(s->remote_user);
+ if (!escaped) {
+ r = -ENOMEM;
+ goto fail;
+ }
+
+ fprintf(f, "REMOTE_USER=%s\n", escaped);
+ }
+
+ if (s->service) {
+ _cleanup_free_ char *escaped;
+
+ escaped = cescape(s->service);
+ if (!escaped) {
+ r = -ENOMEM;
+ goto fail;
+ }
+
+ fprintf(f, "SERVICE=%s\n", escaped);
+ }
+
+ if (s->desktop) {
+ _cleanup_free_ char *escaped;
+
- if (s->remote_user)
- fprintf(f, "REMOTE_USER=%s\n", s->remote_user);
+ escaped = cescape(s->desktop);
+ if (!escaped) {
+ r = -ENOMEM;
+ goto fail;
+ }
+
+ fprintf(f, "DESKTOP=%s\n", escaped);
+ }
- if (s->service)
- fprintf(f, "SERVICE=%s\n", s->service);
+ if (s->seat && seat_has_vts(s->seat))
+ fprintf(f, "VTNR=%u\n", s->vtnr);
- if (s->seat && seat_can_multi_session(s->seat))
- fprintf(f, "VTNR=%i\n", s->vtnr);
+ if (!s->vtnr)
+ fprintf(f, "POSITION=%u\n", s->position);
if (s->leader > 0)
- fprintf(f, "LEADER=%lu\n", (unsigned long) s->leader);
+ fprintf(f, "LEADER="PID_FMT"\n", s->leader);
if (s->audit_id > 0)
fprintf(f, "AUDIT=%"PRIu32"\n", s->audit_id);
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);
+ "REALTIME="USEC_FMT"\n"
+ "MONOTONIC="USEC_FMT"\n",
+ s->timestamp.realtime,
+ s->timestamp.monotonic);
- fflush(f);
+ if (s->controller)
+ fprintf(f, "CONTROLLER=%s\n", s->controller);
+
+ r = fflush_and_check(f);
+ if (r < 0)
+ goto fail;
- if (ferror(f) || rename(temp_path, s->state_file) < 0) {
+ if (rename(temp_path, s->state_file) < 0) {
r = -errno;
- unlink(s->state_file);
- unlink(temp_path);
+ goto fail;
}
-finish:
- if (r < 0)
- log_error("Failed to save session data for %s: %s", s->id, strerror(-r));
+ return 0;
- return r;
+fail:
+ (void) unlink(s->state_file);
+
+ if (temp_path)
+ (void) unlink(temp_path);
+
+ return log_error_errno(r, "Failed to save session data %s: %m", s->state_file);
}
+
int session_load(Session *s) {
_cleanup_free_ char *remote = NULL,
*seat = NULL,
*vtnr = NULL,
+ *state = NULL,
+ *position = NULL,
*leader = NULL,
- *audit_id = NULL,
*type = NULL,
*class = NULL,
*uid = NULL,
*realtime = NULL,
- *monotonic = NULL;
+ *monotonic = NULL,
+ *controller = NULL;
int k, r;
"REMOTE_HOST", &s->remote_host,
"REMOTE_USER", &s->remote_user,
"SERVICE", &s->service,
+ "DESKTOP", &s->desktop,
"VTNR", &vtnr,
+ "STATE", &state,
+ "POSITION", &position,
"LEADER", &leader,
"TYPE", &type,
"CLASS", &class,
"UID", &uid,
"REALTIME", &realtime,
"MONOTONIC", &monotonic,
+ "CONTROLLER", &controller,
NULL);
- if (r < 0) {
- log_error("Failed to read %s: %s", s->state_file, strerror(-r));
- return r;
- }
+ if (r < 0)
+ return log_error_errno(r, "Failed to read %s: %m", s->state_file);
if (!s->user) {
uid_t u;
return r;
}
- user = hashmap_get(s->manager->users, ULONG_TO_PTR((unsigned long) u));
+ user = hashmap_get(s->manager->users, UID_TO_PTR(u));
if (!user) {
log_error("User of session %s not known.", s->id);
return -ENOENT;
s->remote = k;
}
+ if (vtnr)
+ safe_atou(vtnr, &s->vtnr);
+
if (seat && !s->seat) {
Seat *o;
o = hashmap_get(s->manager->seats, seat);
if (o)
- seat_attach_session(o, s);
+ r = seat_attach_session(o, s);
+ if (!o || r < 0)
+ log_error("Cannot attach session %s to seat %s", s->id, seat);
}
- if (vtnr && s->seat && seat_can_multi_session(s->seat)) {
- int v;
+ if (!s->seat || !seat_has_vts(s->seat))
+ s->vtnr = 0;
+
+ if (position && s->seat) {
+ unsigned int npos;
- k = safe_atoi(vtnr, &v);
- if (k >= 0 && v >= 1)
- s->vtnr = v;
+ safe_atou(position, &npos);
+ seat_claim_position(s->seat, s, npos);
}
if (leader) {
s->class = c;
}
+ if (state && streq(state, "closing"))
+ s->stopping = true;
+
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. */
+ writing, but close it right away which then will
+ trigger the EOF. This will happen immediately if no
+ other process has the FIFO open for writing, i. e.
+ when the session died before logind (re)started. */
fd = session_create_fifo(s);
- if (fd >= 0)
- close_nointr_nofail(fd);
+ safe_close(fd);
}
if (realtime) {
s->timestamp.monotonic = l;
}
+ if (controller) {
+ if (bus_name_has_owner(s->manager->bus, controller, NULL) > 0)
+ session_set_controller(s, controller, false);
+ else
+ session_restore_vt(s);
+ }
+
return r;
}
int session_activate(Session *s) {
- int r;
+ unsigned int num_pending;
assert(s);
assert(s->user);
- if (s->vtnr < 0)
- return -ENOTSUP;
-
if (!s->seat)
- return -ENOTSUP;
+ return -EOPNOTSUPP;
if (s->seat->active == s)
return 0;
- assert(seat_is_vtconsole(s->seat));
-
- r = chvt(s->vtnr);
- if (r < 0)
- return r;
-
- return seat_set_active(s->seat, s);
-}
-
-static int session_link_x11_socket(Session *s) {
- char *t, *f, *c;
- size_t k;
-
- assert(s);
- assert(s->user);
- assert(s->user->runtime_path);
-
- if (s->user->display)
- return 0;
-
- if (!s->display || !display_is_local(s->display))
- return 0;
-
- k = strspn(s->display+1, "0123456789");
- f = new(char, sizeof("/tmp/.X11-unix/X") + k);
- if (!f)
- return log_oom();
+ /* on seats with VTs, we let VTs manage session-switching */
+ if (seat_has_vts(s->seat)) {
+ if (!s->vtnr)
+ return -EOPNOTSUPP;
- c = stpcpy(f, "/tmp/.X11-unix/X");
- memcpy(c, s->display+1, k);
- c[k] = 0;
-
- if (access(f, F_OK) < 0) {
- log_warning("Session %s has display %s with non-existing socket %s.", s->id, s->display, f);
- free(f);
- return -ENOENT;
- }
-
- /* Note that this cannot be in a subdir to avoid
- * vulnerabilities since we are privileged but the runtime
- * path is owned by the user */
-
- t = strappend(s->user->runtime_path, "/X11-display");
- if (!t) {
- free(f);
- return log_oom();
+ return chvt(s->vtnr);
}
- if (link(f, t) < 0) {
- if (errno == EEXIST) {
- unlink(t);
+ /* 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. */
- if (link(f, t) >= 0)
- goto done;
- }
-
- if (symlink(f, t) < 0) {
-
- if (errno == EEXIST) {
- unlink(t);
+ s->seat->pending_switch = s;
- if (symlink(f, t) >= 0)
- goto done;
- }
-
- log_error("Failed to link %s to %s: %m", f, t);
- free(f);
- free(t);
- return -errno;
- }
- }
-
-done:
- log_info("Linked %s to %s.", f, t);
- free(f);
- free(t);
-
- s->user->display = 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);
return 0;
}
static int session_start_scope(Session *s) {
- _cleanup_free_ char *description = NULL;
- DBusError error;
- char *job;
int r;
assert(s);
assert(s->user);
assert(s->user->slice);
- dbus_error_init(&error);
-
if (!s->scope) {
- s->scope = strjoin("session-", s->id, ".scope", NULL);
- if (!s->scope)
+ _cleanup_bus_error_free_ sd_bus_error error = SD_BUS_ERROR_NULL;
+ _cleanup_free_ char *description = NULL;
+ char *scope, *job = NULL;
+
+ description = strjoin("Session ", s->id, " of user ", s->user->name, NULL);
+ if (!description)
return log_oom();
- r = hashmap_put(s->manager->session_units, s->scope, s);
- if (r < 0)
- log_warning("Failed to create mapping between unit and session");
- }
+ scope = strjoin("session-", s->id, ".scope", NULL);
+ if (!scope)
+ return log_oom();
- description = strjoin("Session ", s->id, " of user ", s->user->name, NULL);
+ r = manager_start_scope(s->manager, scope, s->leader, s->user->slice, description, "systemd-logind.service", "systemd-user-sessions.service", &error, &job);
+ if (r < 0) {
+ log_error("Failed to start session scope %s: %s %s",
+ scope, bus_error_message(&error, r), error.name);
+ free(scope);
+ return r;
+ } else {
+ s->scope = scope;
- r = manager_start_scope(s->manager, s->scope, s->leader, s->user->slice, description, &error, &job);
- if (r < 0) {
- log_error("Failed to start session scope: %s %s", bus_error(&error, r), error.name);
- dbus_error_free(&error);
- } else {
- free(s->scope_job);
- s->scope_job = job;
+ free(s->scope_job);
+ s->scope_job = job;
+ }
}
+ if (s->scope)
+ hashmap_put(s->manager->session_units, s->scope, s);
+
return 0;
}
if (r < 0)
return r;
- log_struct(s->type == SESSION_TTY || s->type == SESSION_X11 ? LOG_INFO : LOG_DEBUG,
- MESSAGE_ID(SD_MESSAGE_SESSION_START),
+ log_struct(s->class == SESSION_BACKGROUND ? LOG_DEBUG : LOG_INFO,
+ LOG_MESSAGE_ID(SD_MESSAGE_SESSION_START),
"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,
+ "LEADER="PID_FMT, s->leader,
+ LOG_MESSAGE("New session %s of user %s.", s->id, s->user->name),
NULL);
- /* Create X11 symlink */
- session_link_x11_socket(s);
-
if (!dual_timestamp_is_set(&s->timestamp))
dual_timestamp_get(&s->timestamp);
s->started = true;
- /* Save session data */
+ user_elect_display(s->user);
+
+ /* Save data */
session_save(s);
user_save(s->user);
+ if (s->seat)
+ seat_save(s->seat);
+ /* Send signals */
session_send_signal(s, true);
-
+ user_send_changed(s->user, "Sessions", "Display", NULL);
if (s->seat) {
- seat_save(s->seat);
-
if (s->seat->active == s)
- seat_send_changed(s->seat, "Sessions\0ActiveSession\0");
+ seat_send_changed(s->seat, "Sessions", "ActiveSession", NULL);
else
- seat_send_changed(s->seat, "Sessions\0");
+ seat_send_changed(s->seat, "Sessions", NULL);
}
- user_send_changed(s->user, "Sessions\0");
-
return 0;
}
-/* static bool session_shall_kill(Session *s) { */
-/* assert(s); */
-
-/* if (!s->kill_processes) */
-/* return false; */
-
-/* if (strv_contains(s->manager->kill_exclude_users, s->user->name)) */
-/* return false; */
-
-/* if (strv_isempty(s->manager->kill_only_users)) */
-/* return true; */
-
-/* return strv_contains(s->manager->kill_only_users, s->user->name); */
-/* } */
-
-static int session_stop_scope(Session *s) {
- DBusError error;
- char *job;
+static int session_stop_scope(Session *s, bool force) {
+ _cleanup_bus_error_free_ sd_bus_error error = SD_BUS_ERROR_NULL;
+ char *job = NULL;
int r;
assert(s);
- dbus_error_init(&error);
-
if (!s->scope)
return 0;
- 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;
- }
+ if (force || manager_shall_kill(s->manager, s->user->name)) {
+ r = manager_stop_unit(s->manager, s->scope, &error, &job);
+ if (r < 0) {
+ log_error("Failed to stop session scope: %s", bus_error_message(&error, r));
+ return r;
+ }
- free(s->scope_job);
- s->scope_job = job;
+ free(s->scope_job);
+ s->scope_job = job;
+ } else {
+ r = manager_abandon_scope(s->manager, s->scope, &error);
+ if (r < 0) {
+ log_error("Failed to abandon session scope: %s", bus_error_message(&error, r));
+ return r;
+ }
+ }
return 0;
}
-static int session_unlink_x11_socket(Session *s) {
- char *t;
+int session_stop(Session *s, bool force) {
int r;
assert(s);
- assert(s->user);
- if (s->user->display != s)
- return 0;
+ if (!s->user)
+ return -ESTALE;
- s->user->display = NULL;
+ s->timer_event_source = sd_event_source_unref(s->timer_event_source);
- t = strappend(s->user->runtime_path, "/X11-display");
- if (!t)
- return log_oom();
+ if (s->seat)
+ seat_evict_position(s->seat, s);
- r = unlink(t);
- free(t);
+ /* We are going down, don't care about FIFOs anymore */
+ session_remove_fifo(s);
+
+ /* Kill cgroup */
+ r = session_stop_scope(s, force);
+
+ s->stopping = true;
+
+ user_elect_display(s->user);
+
+ session_save(s);
+ user_save(s->user);
- return r < 0 ? -errno : 0;
+ return r;
}
-int session_stop(Session *s) {
- int r = 0, k;
+int session_finalize(Session *s) {
+ SessionDevice *sd;
assert(s);
return -ESTALE;
if (s->started)
- log_struct(s->type == SESSION_TTY || s->type == SESSION_X11 ? LOG_INFO : LOG_DEBUG,
- MESSAGE_ID(SD_MESSAGE_SESSION_STOP),
+ log_struct(s->class == SESSION_BACKGROUND ? LOG_DEBUG : LOG_INFO,
+ LOG_MESSAGE_ID(SD_MESSAGE_SESSION_STOP),
"SESSION_ID=%s", s->id,
"USER_ID=%s", s->user->name,
- "LEADER=%lu", (unsigned long) s->leader,
- "MESSAGE=Removed session %s.", s->id,
+ "LEADER="PID_FMT, s->leader,
+ LOG_MESSAGE("Removed session %s.", s->id),
NULL);
- /* Kill cgroup */
- k = session_stop_scope(s);
- if (k < 0)
- r = k;
+ s->timer_event_source = sd_event_source_unref(s->timer_event_source);
+
+ if (s->seat)
+ seat_evict_position(s->seat, s);
- /* Remove X11 symlink */
- session_unlink_x11_socket(s);
+ /* Kill session devices */
+ while ((sd = hashmap_first(s->devices)))
+ session_device_free(sd);
- unlink(s->state_file);
+ (void) unlink(s->state_file);
session_add_to_gc_queue(s);
user_add_to_gc_queue(s->user);
- if (s->started)
+ if (s->started) {
session_send_signal(s, false);
-
- s->started = false;
+ s->started = false;
+ }
if (s->seat) {
if (s->seat->active == s)
seat_set_active(s->seat, NULL);
- seat_send_changed(s->seat, "Sessions\0");
seat_save(s->seat);
+ seat_send_changed(s->seat, "Sessions", NULL);
}
- user_send_changed(s->user, "Sessions\0");
user_save(s->user);
+ user_send_changed(s->user, "Sessions", "Display", NULL);
- return r;
+ return 0;
+}
+
+static int release_timeout_callback(sd_event_source *es, uint64_t usec, void *userdata) {
+ Session *s = userdata;
+
+ assert(es);
+ assert(s);
+
+ session_stop(s, false);
+ return 0;
+}
+
+int session_release(Session *s) {
+ assert(s);
+
+ if (!s->started || s->stopping)
+ return 0;
+
+ if (s->timer_event_source)
+ return 0;
+
+ return sd_event_add_time(s->manager->event,
+ &s->timer_event_source,
+ CLOCK_MONOTONIC,
+ now(CLOCK_MONOTONIC) + RELEASE_USEC, 0,
+ release_timeout_callback, s);
}
bool session_is_active(Session *s) {
s->idle_hint = b;
dual_timestamp_get(&s->idle_hint_timestamp);
- session_send_changed(s,
- "IdleHint\0"
- "IdleSinceHint\0"
- "IdleSinceHintMonotonic\0");
+ session_send_changed(s, "IdleHint", "IdleSinceHint", "IdleSinceHintMonotonic", NULL);
if (s->seat)
- seat_send_changed(s->seat,
- "IdleHint\0"
- "IdleSinceHint\0"
- "IdleSinceHintMonotonic\0");
+ seat_send_changed(s->seat, "IdleHint", "IdleSinceHint", "IdleSinceHintMonotonic", NULL);
- user_send_changed(s->user,
- "IdleHint\0"
- "IdleSinceHint\0"
- "IdleSinceHintMonotonic\0");
+ user_send_changed(s->user, "IdleHint", "IdleSinceHint", "IdleSinceHintMonotonic", NULL);
+ manager_send_changed(s->manager, "IdleHint", "IdleSinceHint", "IdleSinceHintMonotonic", NULL);
+}
+
+static int session_dispatch_fifo(sd_event_source *es, int fd, uint32_t revents, void *userdata) {
+ Session *s = userdata;
+
+ assert(s);
+ assert(s->fifo_fd == fd);
- manager_send_changed(s->manager,
- "IdleHint\0"
- "IdleSinceHint\0"
- "IdleSinceHintMonotonic\0");
+ /* EOF on the FIFO means the session died abnormally. */
+
+ session_remove_fifo(s);
+ session_stop(s, false);
+
+ return 1;
}
int session_create_fifo(Session *s) {
/* Open reading side */
if (s->fifo_fd < 0) {
- struct epoll_event ev = {};
-
s->fifo_fd = open(s->fifo_path, O_RDONLY|O_CLOEXEC|O_NDELAY);
if (s->fifo_fd < 0)
return -errno;
- r = hashmap_put(s->manager->session_fds, INT_TO_PTR(s->fifo_fd + 1), s);
+ }
+
+ if (!s->fifo_event_source) {
+ r = sd_event_add_io(s->manager->event, &s->fifo_event_source, s->fifo_fd, 0, session_dispatch_fifo, s);
if (r < 0)
return r;
- ev.events = 0;
- ev.data.u32 = FD_OTHER_BASE + s->fifo_fd;
-
- if (epoll_ctl(s->manager->epoll_fd, EPOLL_CTL_ADD, s->fifo_fd, &ev) < 0)
- return -errno;
+ r = sd_event_source_set_priority(s->fifo_event_source, SD_EVENT_PRIORITY_IDLE);
+ if (r < 0)
+ return r;
}
/* Open writing side */
return r;
}
-void session_remove_fifo(Session *s) {
+static void session_remove_fifo(Session *s) {
assert(s);
- if (s->fifo_fd >= 0) {
- assert_se(hashmap_remove(s->manager->session_fds, INT_TO_PTR(s->fifo_fd + 1)) == s);
- 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;
-
- session_save(s);
- user_save(s->user);
- }
+ s->fifo_event_source = sd_event_source_unref(s->fifo_event_source);
+ s->fifo_fd = safe_close(s->fifo_fd);
if (s->fifo_path) {
unlink(s->fifo_path);
}
}
-int session_check_gc(Session *s, bool drop_not_started) {
- int r;
-
+bool session_check_gc(Session *s, bool drop_not_started) {
assert(s);
if (drop_not_started && !s->started)
- return 0;
+ return false;
if (!s->user)
- return 0;
+ return false;
if (s->fifo_fd >= 0) {
-
- r = pipe_eof(s->fifo_fd);
- if (r < 0)
- return r;
-
- if (r == 0)
- return 1;
+ if (pipe_eof(s->fifo_fd) <= 0)
+ return true;
}
- if (s->scope_job)
- return 1;
+ if (s->scope_job && manager_job_is_active(s->manager, s->scope_job))
+ return true;
- if (s->scope)
- return manager_unit_is_active(s->manager, s->scope) != 0;
+ if (s->scope && manager_unit_is_active(s->manager, s->scope))
+ return true;
- return 0;
+ return false;
}
void session_add_to_gc_queue(Session *s) {
if (s->in_gc_queue)
return;
- LIST_PREPEND(Session, gc_queue, s->manager->session_gc_queue, s);
+ LIST_PREPEND(gc_queue, s->manager->session_gc_queue, s);
s->in_gc_queue = true;
}
SessionState session_get_state(Session *s) {
assert(s);
- if (s->scope_job)
- return s->started ? SESSION_OPENING : SESSION_CLOSING;
-
- if (s->fifo_fd < 0)
+ /* always check closing first */
+ if (s->stopping || s->timer_event_source)
return SESSION_CLOSING;
+ if (s->scope_job || s->fifo_fd < 0)
+ return SESSION_OPENING;
+
if (session_is_active(s))
return SESSION_ACTIVE;
return manager_kill_unit(s->manager, s->scope, who, signo, NULL);
}
+static int session_open_vt(Session *s) {
+ char path[sizeof("/dev/tty") + DECIMAL_STR_MAX(s->vtnr)];
+
+ if (s->vtnr < 1)
+ return -ENODEV;
+
+ if (s->vtfd >= 0)
+ return s->vtfd;
+
+ sprintf(path, "/dev/tty%u", s->vtnr);
+ s->vtfd = open_terminal(path, O_RDWR | O_CLOEXEC | O_NONBLOCK | O_NOCTTY);
+ if (s->vtfd < 0)
+ return log_error_errno(errno, "cannot open VT %s of session %s: %m", path, s->id);
+
+ return s->vtfd;
+}
+
+int session_prepare_vt(Session *s) {
+ int vt, r;
+ struct vt_mode mode = { 0 };
+
+ if (s->vtnr < 1)
+ return 0;
+
+ vt = session_open_vt(s);
+ if (vt < 0)
+ return vt;
+
+ r = fchown(vt, s->user->uid, -1);
+ if (r < 0) {
+ r = -errno;
+ log_error_errno(errno, "Cannot change owner of /dev/tty%u: %m", s->vtnr);
+ goto error;
+ }
+
+ r = ioctl(vt, KDSKBMODE, K_OFF);
+ if (r < 0) {
+ r = -errno;
+ log_error_errno(errno, "Cannot set K_OFF on /dev/tty%u: %m", s->vtnr);
+ goto error;
+ }
+
+ r = ioctl(vt, KDSETMODE, KD_GRAPHICS);
+ if (r < 0) {
+ r = -errno;
+ log_error_errno(errno, "Cannot set KD_GRAPHICS on /dev/tty%u: %m", s->vtnr);
+ goto error;
+ }
+
+ /* Oh, thanks to the VT layer, VT_AUTO does not work with KD_GRAPHICS.
+ * So we need a dummy handler here which just acknowledges *all* VT
+ * switch requests. */
+ mode.mode = VT_PROCESS;
+ mode.relsig = SIGRTMIN;
+ mode.acqsig = SIGRTMIN + 1;
+ r = ioctl(vt, VT_SETMODE, &mode);
+ if (r < 0) {
+ r = -errno;
+ log_error_errno(errno, "Cannot set VT_PROCESS on /dev/tty%u: %m", s->vtnr);
+ goto error;
+ }
+
+ return 0;
+
+error:
+ session_restore_vt(s);
+ return r;
+}
+
+void session_restore_vt(Session *s) {
+ _cleanup_free_ char *utf8 = NULL;
+ int vt, kb = K_XLATE;
+ struct vt_mode mode = { 0 };
+
+ /* We need to get a fresh handle to the virtual terminal,
+ * since the old file-descriptor is potentially in a hung-up
+ * state after the controlling process exited; we do a
+ * little dance to avoid having the terminal be available
+ * for reuse before we've cleaned it up.
+ */
+ int old_fd = s->vtfd;
+ s->vtfd = -1;
+
+ vt = session_open_vt(s);
+ safe_close(old_fd);
+
+ if (vt < 0)
+ return;
+
+ (void) ioctl(vt, KDSETMODE, KD_TEXT);
+
+ if (read_one_line_file("/sys/module/vt/parameters/default_utf8", &utf8) >= 0 && *utf8 == '1')
+ kb = K_UNICODE;
+
+ (void) ioctl(vt, KDSKBMODE, kb);
+
+ mode.mode = VT_AUTO;
+ (void) ioctl(vt, VT_SETMODE, &mode);
+
+ fchown(vt, 0, -1);
+
+ s->vtfd = safe_close(s->vtfd);
+}
+
+void session_leave_vt(Session *s) {
+ int r;
+
+ assert(s);
+
+ /* This is called whenever we get a VT-switch signal from the kernel.
+ * We acknowledge all of them unconditionally. Note that session are
+ * free to overwrite those handlers and we only register them for
+ * sessions with controllers. Legacy sessions are not affected.
+ * However, if we switch from a non-legacy to a legacy session, we must
+ * make sure to pause all device before acknowledging the switch. We
+ * process the real switch only after we are notified via sysfs, so the
+ * legacy session might have already started using the devices. If we
+ * don't pause the devices before the switch, we might confuse the
+ * session we switch to. */
+
+ if (s->vtfd < 0)
+ return;
+
+ session_device_pause_all(s);
+ r = ioctl(s->vtfd, VT_RELDISP, 1);
+ if (r < 0)
+ log_debug_errno(errno, "Cannot release VT of session %s: %m", s->id);
+}
+
+bool session_is_controller(Session *s, const char *sender) {
+ assert(s);
+
+ return streq_ptr(s->controller, sender);
+}
+
+static void session_release_controller(Session *s, bool notify) {
+ _cleanup_free_ char *name = NULL;
+ SessionDevice *sd;
+
+ if (!s->controller)
+ return;
+
+ name = s->controller;
+
+ /* By resetting the controller before releasing the devices, we won't
+ * send notification signals. This avoids sending useless notifications
+ * if the controller is released on disconnects. */
+ if (!notify)
+ s->controller = NULL;
+
+ while ((sd = hashmap_first(s->devices)))
+ session_device_free(sd);
+
+ s->controller = NULL;
+ s->track = sd_bus_track_unref(s->track);
+}
+
+static int on_bus_track(sd_bus_track *track, void *userdata) {
+ Session *s = userdata;
+
+ assert(track);
+ assert(s);
+
+ session_drop_controller(s);
+
+ return 0;
+}
+
+int session_set_controller(Session *s, const char *sender, bool force) {
+ _cleanup_free_ char *name = NULL;
+ int r;
+
+ assert(s);
+ assert(sender);
+
+ if (session_is_controller(s, sender))
+ return 0;
+ if (s->controller && !force)
+ return -EBUSY;
+
+ name = strdup(sender);
+ if (!name)
+ return -ENOMEM;
+
+ s->track = sd_bus_track_unref(s->track);
+ r = sd_bus_track_new(s->manager->bus, &s->track, on_bus_track, s);
+ if (r < 0)
+ return r;
+
+ r = sd_bus_track_add_name(s->track, name);
+ if (r < 0)
+ return r;
+
+ /* When setting a session controller, we forcibly mute the VT and set
+ * it into graphics-mode. Applications can override that by changing
+ * VT state after calling TakeControl(). However, this serves as a good
+ * default and well-behaving controllers can now ignore VTs entirely.
+ * Note that we reset the VT on ReleaseControl() and if the controller
+ * exits.
+ * If logind crashes/restarts, we restore the controller during restart
+ * or reset the VT in case it crashed/exited, too. */
+ r = session_prepare_vt(s);
+ if (r < 0) {
+ s->track = sd_bus_track_unref(s->track);
+ return r;
+ }
+
+ session_release_controller(s, true);
+ s->controller = name;
+ name = NULL;
+ session_save(s);
+
+ return 0;
+}
+
+void session_drop_controller(Session *s) {
+ assert(s);
+
+ if (!s->controller)
+ return;
+
+ s->track = sd_bus_track_unref(s->track);
+ session_release_controller(s, false);
+ session_save(s);
+ session_restore_vt(s);
+}
+
static const char* const session_state_table[_SESSION_STATE_MAX] = {
[SESSION_OPENING] = "opening",
[SESSION_ONLINE] = "online",
DEFINE_STRING_TABLE_LOOKUP(session_state, SessionState);
static const char* const session_type_table[_SESSION_TYPE_MAX] = {
+ [SESSION_UNSPECIFIED] = "unspecified",
[SESSION_TTY] = "tty",
[SESSION_X11] = "x11",
- [SESSION_UNSPECIFIED] = "unspecified"
+ [SESSION_WAYLAND] = "wayland",
+ [SESSION_MIR] = "mir",
+ [SESSION_WEB] = "web",
};
DEFINE_STRING_TABLE_LOOKUP(session_type, SessionType);
~ianmdlvl / elogind.git / blobdiff