-/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
-
/***
This file is part of systemd.
#include <errno.h>
#include <fcntl.h>
-#include <linux/vt.h>
#include <linux/kd.h>
+#include <linux/vt.h>
#include <signal.h>
#include <string.h>
#include <sys/ioctl.h>
#include <unistd.h>
-#include "sd-id128.h"
#include "sd-messages.h"
-#include "strv.h"
-#include "util.h"
-#include "mkdir.h"
-#include "path-util.h"
-#include "fileio.h"
-#include "audit.h"
-#include "bus-util.h"
+
+#include "alloc-util.h"
+#include "audit-util.h"
#include "bus-error.h"
+#include "bus-util.h"
+#include "escape.h"
+#include "extract-word.h"
+#include "fd-util.h"
+#include "fileio.h"
+#include "format-util.h"
+#include "io-util.h"
#include "logind-session.h"
+#include "mkdir.h"
+#include "parse-util.h"
+#include "path-util.h"
+#include "string-table.h"
+#include "terminal-util.h"
+#include "user-util.h"
+#include "util.h"
-static unsigned long devt_hash_func(const void *p, const uint8_t hash_key[HASH_KEY_SIZE]) {
- uint64_t u = *(const dev_t*)p;
-
- return uint64_hash_func(&u, hash_key);
-}
-
-static int devt_compare_func(const void *_a, const void *_b) {
- dev_t a, b;
-
- a = *(const dev_t*) _a;
- b = *(const dev_t*) _b;
+#define RELEASE_USEC (20*USEC_PER_SEC)
- return a < b ? -1 : (a > b ? 1 : 0);
-}
+static void session_remove_fifo(Session *s);
Session* session_new(Manager *m, const char *id) {
Session *s;
return NULL;
s->state_file = strappend("/run/systemd/sessions/", id);
- if (!s->state_file) {
- free(s);
- return NULL;
- }
+ if (!s->state_file)
+ return mfree(s);
- s->devices = hashmap_new(devt_hash_func, devt_compare_func);
+ s->devices = hashmap_new(&devt_hash_ops);
if (!s->devices) {
free(s->state_file);
- free(s);
- return NULL;
+ return mfree(s);
}
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;
+ return mfree(s);
}
s->manager = m;
if (s->in_gc_queue)
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);
free(s->scope);
}
+#if 0 /// elogind does not support systemd scope_jobs
free(s->scope_job);
+#endif // 0
sd_bus_message_unref(s->create_message);
free(s->remote_host);
free(s->remote_user);
free(s->service);
+ free(s->desktop);
hashmap_remove(s->manager->sessions, s->id);
LIST_PREPEND(sessions_by_user, u->sessions, s);
}
+static void session_save_devices(Session *s, FILE *f) {
+ SessionDevice *sd;
+ Iterator i;
+
+ if (!hashmap_isempty(s->devices)) {
+ fprintf(f, "DEVICES=");
+ HASHMAP_FOREACH(sd, s->devices, i)
+ fprintf(f, "%u:%u ", major(sd->dev), minor(sd->dev));
+ fprintf(f, "\n");
+ }
+}
+
int session_save(Session *s) {
_cleanup_free_ char *temp_path = NULL;
_cleanup_fclose_ FILE *f = NULL;
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 0 /// elogind does not support systemd scope_jobs
if (s->scope_job)
fprintf(f, "SCOPE_JOB=%s\n", s->scope_job);
+#endif // 0
if (s->fifo_path)
fprintf(f, "FIFO=%s\n", s->fifo_path);
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;
- if (s->remote_user)
- fprintf(f, "REMOTE_USER=%s\n", s->remote_user);
+ 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->service)
- fprintf(f, "SERVICE=%s\n", s->service);
+
+ escaped = cescape(s->desktop);
+ if (!escaped) {
+ r = -ENOMEM;
+ goto fail;
+ }
+
+ fprintf(f, "DESKTOP=%s\n", escaped);
+ }
if (s->seat && seat_has_vts(s->seat))
fprintf(f, "VTNR=%u\n", s->vtnr);
if (!s->vtnr)
- fprintf(f, "POS=%u\n", s->pos);
+ 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);
- if (s->controller)
+ if (s->controller) {
fprintf(f, "CONTROLLER=%s\n", s->controller);
+ session_save_devices(s, f);
+ }
- fflush(f);
+ 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;
+ }
+
+ return 0;
+
+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);
+}
+
+static int session_load_devices(Session *s, const char *devices) {
+ const char *p;
+ int r = 0;
+
+ assert(s);
+
+ for (p = devices;;) {
+ _cleanup_free_ char *word = NULL;
+ SessionDevice *sd;
+ dev_t dev;
+ int k;
+
+ k = extract_first_word(&p, &word, NULL, 0);
+ if (k == 0)
+ break;
+ if (k < 0) {
+ r = k;
+ break;
+ }
+
+ k = parse_dev(word, &dev);
+ if (k < 0) {
+ r = k;
+ continue;
+ }
+
+ /* The file descriptors for loaded devices will be reattached later. */
+ k = session_device_new(s, dev, false, &sd);
+ if (k < 0)
+ r = k;
}
-finish:
if (r < 0)
- log_error("Failed to save session data for %s: %s", s->id, strerror(-r));
+ log_error_errno(r, "Loading session devices for session %s failed: %m", s->id);
return r;
}
_cleanup_free_ char *remote = NULL,
*seat = NULL,
*vtnr = NULL,
- *pos = NULL,
+ *state = NULL,
+ *position = NULL,
*leader = NULL,
*type = NULL,
*class = NULL,
*uid = NULL,
*realtime = NULL,
*monotonic = NULL,
- *controller = NULL;
+ *controller = NULL,
+ *active = NULL,
+ *devices = NULL;
int k, r;
r = parse_env_file(s->state_file, NEWLINE,
"REMOTE", &remote,
"SCOPE", &s->scope,
+#if 0 /// elogind does not support systemd scope_jobs
"SCOPE_JOB", &s->scope_job,
+#endif // 0
"FIFO", &s->fifo_path,
"SEAT", &seat,
"TTY", &s->tty,
"REMOTE_HOST", &s->remote_host,
"REMOTE_USER", &s->remote_user,
"SERVICE", &s->service,
+ "DESKTOP", &s->desktop,
"VTNR", &vtnr,
- "POS", &pos,
+ "STATE", &state,
+ "POSITION", &position,
"LEADER", &leader,
"TYPE", &type,
"CLASS", &class,
"REALTIME", &realtime,
"MONOTONIC", &monotonic,
"CONTROLLER", &controller,
+ "ACTIVE", &active,
+ "DEVICES", &devices,
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;
if (!s->seat || !seat_has_vts(s->seat))
s->vtnr = 0;
- if (pos && s->seat) {
+ if (position && s->seat) {
unsigned int npos;
- safe_atou(pos, &npos);
+ safe_atou(position, &npos);
seat_claim_position(s->seat, s, npos);
}
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) {
- unsigned long long l;
- if (sscanf(realtime, "%llu", &l) > 0)
- s->timestamp.realtime = l;
- }
+ if (realtime)
+ timestamp_deserialize(realtime, &s->timestamp.realtime);
+ if (monotonic)
+ timestamp_deserialize(monotonic, &s->timestamp.monotonic);
- if (monotonic) {
- unsigned long long l;
- if (sscanf(monotonic, "%llu", &l) > 0)
- s->timestamp.monotonic = l;
+ if (active) {
+ k = parse_boolean(active);
+ if (k >= 0)
+ s->was_active = k;
}
if (controller) {
- if (bus_name_has_owner(s->manager->bus, controller, NULL) > 0)
- session_set_controller(s, controller, false);
- else
+ if (bus_name_has_owner(s->manager->bus, controller, NULL) > 0) {
+ session_set_controller(s, controller, false, false);
+ session_load_devices(s, devices);
+ } else
session_restore_vt(s);
}
assert(s->user);
if (!s->seat)
- return -ENOTSUP;
+ return -EOPNOTSUPP;
if (s->seat->active == s)
return 0;
/* on seats with VTs, we let VTs manage session-switching */
if (seat_has_vts(s->seat)) {
if (!s->vtnr)
- return -ENOTSUP;
+ return -EOPNOTSUPP;
return chvt(s->vtnr);
}
return 0;
}
+#if 0 /// UNNEEDED by elogind
static int session_start_scope(Session *s) {
int r;
assert(s);
assert(s->user);
- assert(s->user->slice);
if (!s->scope) {
- _cleanup_bus_error_free_ sd_bus_error error = SD_BUS_ERROR_NULL;
- _cleanup_free_ char *description = NULL;
- const char *kill_mode;
- char *scope, *job;
-
- description = strjoin("Session ", s->id, " of user ", s->user->name, NULL);
- if (!description)
- return log_oom();
+ _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL;
+ char *scope, *job = NULL;
+ const char *description;
- scope = strjoin("session-", s->id, ".scope", NULL);
+ scope = strjoin("session-", s->id, ".scope");
if (!scope)
return log_oom();
- kill_mode = manager_shall_kill(s->manager, s->user->name) ? "control-group" : "none";
-
- r = manager_start_scope(s->manager, scope, s->leader, s->user->slice, description, "systemd-user-sessions.service", kill_mode, &error, &job);
+ description = strjoina("Session ", s->id, " of user ", s->user->name);
+
+ r = manager_start_scope(
+ s->manager,
+ scope,
+ s->leader,
+ s->user->slice,
+ description,
+ "systemd-logind.service",
+ "systemd-user-sessions.service",
+ (uint64_t) -1, /* disable TasksMax= for the scope, rely on the slice setting for it */
+ &error,
+ &job);
if (r < 0) {
- log_error("Failed to start session scope %s: %s %s",
- scope, bus_error_message(&error, r), error.name);
+ log_error_errno(r, "Failed to start session scope %s: %s", scope, bus_error_message(&error, r));
free(scope);
return r;
} else {
}
if (s->scope)
- hashmap_put(s->manager->session_units, s->scope, s);
+ (void) hashmap_put(s->manager->session_units, s->scope, s);
+
+ return 0;
+}
+#else
+static int session_start_cgroup(Session *s) {
+ int r;
+
+ assert(s);
+ assert(s->user);
+ assert(s->leader > 0);
+
+ /* First, create our own group */
+ r = cg_create(SYSTEMD_CGROUP_CONTROLLER, s->id);
+ if (r < 0)
+ return log_error_errno(r, "Failed to create cgroup %s: %m", s->id);
+
+ r = cg_attach(SYSTEMD_CGROUP_CONTROLLER, s->id, s->leader);
+ if (r < 0)
+ log_warning_errno(r, "Failed to attach PID %d to cgroup %s: %m", s->leader, s->id);
return 0;
}
+#endif // 0
int session_start(Session *s) {
int r;
return r;
/* Create cgroup */
+#if 0 /// elogind does its own session management
r = session_start_scope(s);
+#else
+ r = session_start_cgroup(s);
+#endif // 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,
+ "MESSAGE_ID=" SD_MESSAGE_SESSION_START_STR,
"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);
if (!dual_timestamp_is_set(&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, "Display", NULL);
if (s->seat) {
- seat_save(s->seat);
-
if (s->seat->active == s)
- seat_send_changed(s->seat, "Sessions", "ActiveSession", NULL);
- else
- seat_send_changed(s->seat, "Sessions", NULL);
+ seat_send_changed(s->seat, "ActiveSession", NULL);
}
- user_send_changed(s->user, "Sessions", NULL);
-
return 0;
}
-static int session_stop_scope(Session *s) {
- _cleanup_bus_error_free_ sd_bus_error error = SD_BUS_ERROR_NULL;
- char *job;
+#if 0 /// UNNEEDED by elogind
+static int session_stop_scope(Session *s, bool force) {
+ _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL;
int r;
assert(s);
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_message(&error, r));
- return r;
- }
+ /* Let's always abandon the scope first. This tells systemd that we are not interested anymore, and everything
+ * that is left in the scope is "left-over". Informing systemd about this has the benefit that it will log
+ * when killing any processes left after this point. */
+ r = manager_abandon_scope(s->manager, s->scope, &error);
+ if (r < 0)
+ log_warning_errno(r, "Failed to abandon session scope, ignoring: %s", bus_error_message(&error, r));
- free(s->scope_job);
- s->scope_job = job;
+ /* Optionally, let's kill everything that's left now. */
+ if (force || manager_shall_kill(s->manager, s->user->name)) {
+ char *job = NULL;
+
+ r = manager_stop_unit(s->manager, s->scope, &error, &job);
+ if (r < 0)
+ return log_error_errno(r, "Failed to stop session scope: %s", bus_error_message(&error, r));
+
+ free(s->scope_job);
+ s->scope_job = job;
+ } else
+ s->scope_job = mfree(s->scope_job);
return 0;
}
+#else
+static int session_stop_cgroup(Session *s, bool force) {
+ _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL;
+ int r;
-int session_stop(Session *s) {
+ assert(s);
+
+ if (force || manager_shall_kill(s->manager, s->user->name)) {
+ r = session_kill(s, KILL_ALL, SIGTERM);
+ if (r < 0)
+ return r;
+ }
+
+ return 0;
+}
+#endif // 0
+
+int session_stop(Session *s, bool force) {
int r;
assert(s);
if (!s->user)
return -ESTALE;
+ s->timer_event_source = sd_event_source_unref(s->timer_event_source);
+
+ if (s->seat)
+ seat_evict_position(s->seat, s);
+
+ /* We are going down, don't care about FIFOs anymore */
+ session_remove_fifo(s);
+
/* Kill cgroup */
- r = session_stop_scope(s);
+#if 0 /// elogind does not start scopes, but sessions
+ r = session_stop_scope(s, force);
+#else
+ r = session_stop_cgroup(s, force);
+#endif // 0
+
+ s->stopping = true;
+
+ user_elect_display(s->user);
session_save(s);
user_save(s->user);
+#if 1 /// elogind must queue this session again
+ session_add_to_gc_queue(s);
+#endif // 1
+
return r;
}
int session_finalize(Session *s) {
- int r = 0;
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,
+ "MESSAGE_ID=" SD_MESSAGE_SESSION_STOP_STR,
"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);
+ s->timer_event_source = sd_event_source_unref(s->timer_event_source);
+
+ if (s->seat)
+ seat_evict_position(s->seat, 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->seat->active == s)
seat_set_active(s->seat, NULL);
- seat_send_changed(s->seat, "Sessions", NULL);
seat_save(s->seat);
}
- user_send_changed(s->user, "Sessions", NULL);
user_save(s->user);
+ user_send_changed(s->user, "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) {
/* Graphical sessions should really implement a real
* idle hint logic */
- if (s->display)
+ if (SESSION_TYPE_IS_GRAPHICAL(s->type))
goto dont_know;
/* For sessions with an explicitly configured tty, let's check
manager_send_changed(s->manager, "IdleHint", "IdleSinceHint", "IdleSinceHintMonotonic", NULL);
}
+int session_get_locked_hint(Session *s) {
+ assert(s);
+
+ return s->locked_hint;
+}
+
+void session_set_locked_hint(Session *s, bool b) {
+ assert(s);
+
+ if (s->locked_hint == b)
+ return;
+
+ s->locked_hint = b;
+
+ session_send_changed(s, "LockedHint", NULL);
+}
+
static int session_dispatch_fifo(sd_event_source *es, int fd, uint32_t revents, void *userdata) {
Session *s = userdata;
/* EOF on the FIFO means the session died abnormally. */
session_remove_fifo(s);
- session_stop(s);
+ session_stop(s, false);
return 1;
}
}
if (!s->fifo_event_source) {
- r = sd_event_add_io(s->manager->event, s->fifo_fd, 0, session_dispatch_fifo, s, &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;
- r = sd_event_source_set_priority(s->fifo_event_source, SD_EVENT_PRIORITY_IDLE);
+ /* Let's make sure we noticed dead sessions before we process new bus requests (which might create new
+ * sessions). */
+ r = sd_event_source_set_priority(s->fifo_event_source, SD_EVENT_PRIORITY_NORMAL-10);
if (r < 0)
return r;
}
return r;
}
-void session_remove_fifo(Session *s) {
+static void session_remove_fifo(Session *s) {
assert(s);
- if (s->fifo_event_source)
- s->fifo_event_source = sd_event_source_unref(s->fifo_event_source);
-
- if (s->fifo_fd >= 0) {
- close_nointr_nofail(s->fifo_fd);
- s->fifo_fd = -1;
- }
+ 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);
- free(s->fifo_path);
- s->fifo_path = NULL;
+ s->fifo_path = mfree(s->fifo_path);
}
}
bool session_check_gc(Session *s, bool drop_not_started) {
- int r;
-
assert(s);
if (drop_not_started && !s->started)
return false;
if (s->fifo_fd >= 0) {
- r = pipe_eof(s->fifo_fd);
- if (r < 0)
- return true;
-
- if (r == 0)
+ if (pipe_eof(s->fifo_fd) <= 0)
return true;
}
+#if 0 /// elogind supports neither scopes nor jobs
if (s->scope_job && manager_job_is_active(s->manager, s->scope_job))
return true;
if (s->scope && manager_unit_is_active(s->manager, s->scope))
return true;
+#endif // 0
return false;
}
SessionState session_get_state(Session *s) {
assert(s);
- if (s->scope_job)
- return SESSION_OPENING;
+ /* always check closing first */
+ if (s->stopping || s->timer_event_source)
+ return SESSION_CLOSING;
+#if 0 /// elogind does not support systemd scope_jobs
+ if (s->scope_job || s->fifo_fd < 0)
+#else
if (s->fifo_fd < 0)
- return SESSION_CLOSING;
+#endif // 0
+ return SESSION_OPENING;
if (session_is_active(s))
return SESSION_ACTIVE;
int session_kill(Session *s, KillWho who, int signo) {
assert(s);
+#if 0 /// Without direct cgroup support, elogind can not kill sessions
if (!s->scope)
return -ESRCH;
return manager_kill_unit(s->manager, s->scope, who, signo, NULL);
+#else
+ if (who == KILL_LEADER) {
+ if (s->leader <= 0)
+ return -ESRCH;
+
+ /* FIXME: verify that leader is in cgroup? */
+
+ if (kill(s->leader, signo) < 0) {
+ return log_error_errno(errno, "Failed to kill process leader %d for session %s: %m", s->leader, s->id);
+ }
+ return 0;
+ } else
+ return cg_kill_recursive (SYSTEMD_CGROUP_CONTROLLER, s->id, signo,
+ CGROUP_IGNORE_SELF | CGROUP_REMOVE,
+ NULL, NULL, NULL);
+#endif // 0
}
static int session_open_vt(Session *s) {
- char path[128];
+ char path[sizeof("/dev/tty") + DECIMAL_STR_MAX(s->vtnr)];
- if (!s->vtnr)
- return -1;
+ if (s->vtnr < 1)
+ return -ENODEV;
if (s->vtfd >= 0)
return s->vtfd;
sprintf(path, "/dev/tty%u", s->vtnr);
- s->vtfd = open(path, O_RDWR | O_CLOEXEC | O_NONBLOCK | O_NOCTTY);
- if (s->vtfd < 0) {
- log_error("cannot open VT %s of session %s: %m", path, s->id);
- return -1;
- }
+ s->vtfd = open_terminal(path, O_RDWR | O_CLOEXEC | O_NONBLOCK | O_NOCTTY);
+ if (s->vtfd < 0)
+ return log_error_errno(s->vtfd, "cannot open VT %s of session %s: %m", path, s->id);
return s->vtfd;
}
-static int session_vt_fn(sd_event_source *source, const struct signalfd_siginfo *si, void *data) {
- Session *s = data;
-
- if (s->vtfd >= 0)
- ioctl(s->vtfd, VT_RELDISP, 1);
-
- return 0;
-}
-
-void session_mute_vt(Session *s) {
+int session_prepare_vt(Session *s) {
int vt, r;
struct vt_mode mode = { 0 };
- sigset_t mask;
+
+ if (s->vtnr < 1)
+ return 0;
vt = session_open_vt(s);
if (vt < 0)
- return;
+ return vt;
- r = ioctl(vt, KDSKBMODE, K_OFF);
- if (r < 0)
+ r = fchown(vt, s->user->uid, -1);
+ if (r < 0) {
+ r = log_error_errno(errno,
+ "Cannot change owner of /dev/tty%u: %m",
+ s->vtnr);
goto error;
+ }
- r = ioctl(vt, KDSETMODE, KD_GRAPHICS);
- if (r < 0)
+ r = ioctl(vt, KDSKBMODE, K_OFF);
+ if (r < 0) {
+ r = log_error_errno(errno,
+ "Cannot set K_OFF on /dev/tty%u: %m",
+ s->vtnr);
goto error;
+ }
- sigemptyset(&mask);
- sigaddset(&mask, SIGUSR1);
- sigprocmask(SIG_BLOCK, &mask, NULL);
-
- r = sd_event_add_signal(s->manager->event, SIGUSR1, session_vt_fn, s, &s->vt_source);
- if (r < 0)
+ r = ioctl(vt, KDSETMODE, KD_GRAPHICS);
+ if (r < 0) {
+ r = 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 = SIGUSR1;
- mode.acqsig = SIGUSR1;
+ mode.relsig = SIGRTMIN;
+ mode.acqsig = SIGRTMIN + 1;
r = ioctl(vt, VT_SETMODE, &mode);
- if (r < 0)
+ if (r < 0) {
+ r = log_error_errno(errno,
+ "Cannot set VT_PROCESS on /dev/tty%u: %m",
+ s->vtnr);
goto error;
+ }
- return;
+ return 0;
error:
- log_error("cannot mute VT %u for session %s (%d/%d)", s->vtnr, s->id, r, errno);
session_restore_vt(s);
+ return r;
}
void session_restore_vt(Session *s) {
- _cleanup_free_ char *utf8;
- int vt, kb = K_XLATE;
- struct vt_mode mode = { 0 };
+
+ static const struct vt_mode mode = {
+ .mode = VT_AUTO,
+ };
+
+ _cleanup_free_ char *utf8 = NULL;
+ int vt, kb, old_fd;
+
+ /* 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.
+ */
+ old_fd = s->vtfd;
+ s->vtfd = -1;
vt = session_open_vt(s);
+ safe_close(old_fd);
+
if (vt < 0)
return;
- sd_event_source_unref(s->vt_source);
- s->vt_source = NULL;
-
- ioctl(vt, KDSETMODE, KD_TEXT);
+ (void) ioctl(vt, KDSETMODE, KD_TEXT);
if (read_one_line_file("/sys/module/vt/parameters/default_utf8", &utf8) >= 0 && *utf8 == '1')
kb = K_UNICODE;
- ioctl(vt, KDSKBMODE, kb);
+ else
+ kb = K_XLATE;
- mode.mode = VT_AUTO;
- ioctl(vt, VT_SETMODE, &mode);
+ (void) ioctl(vt, KDSKBMODE, kb);
- close_nointr_nofail(vt);
- s->vtfd = -1;
+ (void) ioctl(vt, VT_SETMODE, &mode);
+ (void) fchown(vt, 0, (gid_t) -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) {
return streq_ptr(s->controller, sender);
}
-static void session_swap_controller(Session *s, char *name) {
+static void session_release_controller(Session *s, bool notify) {
+ _cleanup_free_ char *name = NULL;
SessionDevice *sd;
- if (s->controller) {
- manager_drop_busname(s->manager, s->controller);
- free(s->controller);
+ 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;
- /* Drop all devices as they're now unused. Do that after the
- * controller is released to avoid sending out useles
- * dbus signals. */
- while ((sd = hashmap_first(s->devices)))
- session_device_free(sd);
+ while ((sd = hashmap_first(s->devices)))
+ session_device_free(sd);
- if (!name)
- session_restore_vt(s);
- }
+ s->controller = NULL;
+ s->track = sd_bus_track_unref(s->track);
+}
- s->controller = name;
- session_save(s);
+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) {
- char *t;
+int session_set_controller(Session *s, const char *sender, bool force, bool prepare) {
+ _cleanup_free_ char *name = NULL;
int r;
assert(s);
if (s->controller && !force)
return -EBUSY;
- t = strdup(sender);
- if (!t)
+ name = strdup(sender);
+ if (!name)
return -ENOMEM;
- r = manager_watch_busname(s->manager, sender);
- if (r) {
- free(t);
+ 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;
- }
- session_swap_controller(s, t);
+ 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
* 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. */
- session_mute_vt(s);
+ * (without preparing the VT since the controller has probably overridden
+ * VT state by now) or reset the VT in case it crashed/exited, too. */
+ if (prepare) {
+ 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;
}
if (!s->controller)
return;
- session_swap_controller(s, NULL);
+ 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] = {
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