#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 "audit.h"
#include "bus-util.h"
#include "bus-error.h"
+#include "cgroup-util.h"
+#include "def.h"
#include "logind-session.h"
-
-#define RELEASE_USEC (20*USEC_PER_SEC)
+#include "formats-util.h"
static void session_remove_fifo(Session *s);
-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;
-
- return a < b ? -1 : (a > b ? 1 : 0);
-}
-
Session* session_new(Manager *m, const char *id) {
Session *s;
return NULL;
}
- 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);
LIST_REMOVE(sessions_by_seat, s->seat->sessions, s);
}
- if (s->scope) {
- hashmap_remove(s->manager->session_units, s->scope);
- free(s->scope);
- }
-
- free(s->scope_job);
-
sd_bus_message_unref(s->create_message);
free(s->tty);
hashmap_remove(s->manager->sessions, s->id);
- s->vt_source = sd_event_source_unref(s->vt_source);
-
free(s->state_file);
free(s);
}
if (s->class >= 0)
fprintf(f, "CLASS=%s\n", session_class_to_string(s->class));
- 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->fifo_path)
fprintf(f, "FIFO=%s\n", s->fifo_path);
finish:
if (r < 0)
- log_error("Failed to save session data %s: %s", s->state_file, strerror(-r));
+ log_error_errno(r, "Failed to save session data %s: %m", s->state_file);
return r;
}
_cleanup_free_ char *remote = NULL,
*seat = NULL,
*vtnr = NULL,
+ *state = NULL,
*pos = NULL,
*leader = NULL,
*type = NULL,
r = parse_env_file(s->state_file, NEWLINE,
"REMOTE", &remote,
- "SCOPE", &s->scope,
- "SCOPE_JOB", &s->scope_job,
"FIFO", &s->fifo_path,
"SEAT", &seat,
"TTY", &s->tty,
"SERVICE", &s->service,
"DESKTOP", &s->desktop,
"VTNR", &vtnr,
+ "STATE", &state,
"POS", &pos,
"LEADER", &leader,
"TYPE", &type,
"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->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);
safe_close(fd);
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;
}
-static int session_start_scope(Session *s) {
+static int session_start_cgroup(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;
- char *scope, *job = NULL;
-
- description = strjoin("Session ", s->id, " of user ", s->user->name, NULL);
- if (!description)
- return log_oom();
-
- scope = strjoin("session-", s->id, ".scope", NULL);
- if (!scope)
- return log_oom();
-
- 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;
+ assert(s->leader > 0);
- free(s->scope_job);
- s->scope_job = job;
- }
- }
+ /* 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);
- if (s->scope)
- hashmap_put(s->manager->session_units, s->scope, s);
+ 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;
}
if (r < 0)
return r;
- /* Create cgroup */
- r = session_start_scope(s);
+ r = session_start_cgroup(s);
if (r < 0)
return r;
log_struct(s->class == SESSION_BACKGROUND ? LOG_DEBUG : LOG_INFO,
- MESSAGE_ID(SD_MESSAGE_SESSION_START),
+ LOG_MESSAGE_ID(SD_MESSAGE_SESSION_START),
"SESSION_ID=%s", s->id,
"USER_ID=%s", s->user->name,
"LEADER="PID_FMT, s->leader,
- "MESSAGE=New session %s of user %s.", s->id, s->user->name,
+ LOG_MESSAGE("New session %s of user %s.", s->id, s->user->name),
NULL);
if (!dual_timestamp_is_set(&s->timestamp))
return 0;
}
-static int session_stop_scope(Session *s, bool force) {
+static int session_stop_cgroup(Session *s, bool force) {
_cleanup_bus_error_free_ sd_bus_error error = SD_BUS_ERROR_NULL;
- char *job = NULL;
int r;
assert(s);
- if (!s->scope)
- return 0;
-
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;
- } 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));
+ r = session_kill(s, KILL_ALL, SIGTERM);
+ if (r < 0)
return r;
- }
}
return 0;
session_remove_fifo(s);
/* Kill cgroup */
- r = session_stop_scope(s, force);
+ r = session_stop_cgroup(s, force);
s->stopping = true;
if (s->started)
log_struct(s->class == SESSION_BACKGROUND ? LOG_DEBUG : LOG_INFO,
- MESSAGE_ID(SD_MESSAGE_SESSION_STOP),
+ LOG_MESSAGE_ID(SD_MESSAGE_SESSION_STOP),
"SESSION_ID=%s", s->id,
"USER_ID=%s", s->user->name,
"LEADER="PID_FMT, s->leader,
- "MESSAGE=Removed session %s.", s->id,
+ LOG_MESSAGE("Removed session %s.", s->id),
NULL);
s->timer_event_source = sd_event_source_unref(s->timer_event_source);
return r;
}
-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;
-}
-
-void session_release(Session *s) {
+int session_release(Session *s) {
assert(s);
if (!s->started || s->stopping)
- return;
+ return 0;
- if (!s->timer_event_source)
- sd_event_add_time(s->manager->event,
- &s->timer_event_source,
- CLOCK_MONOTONIC,
- now(CLOCK_MONOTONIC) + RELEASE_USEC, 0,
- release_timeout_callback, s);
+ if (s->timer_event_source)
+ return 0;
+
+ /* In systemd, session release is triggered by user jobs
+ dying. In elogind we don't have that so go ahead and stop
+ now. */
+ return session_stop(s, false);
}
bool session_is_active(Session *s) {
return true;
}
- 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))
+ if (cg_is_empty_recursive (SYSTEMD_CGROUP_CONTROLLER, s->id, false) > 0)
return true;
return false;
if (s->stopping || s->timer_event_source)
return SESSION_CLOSING;
- if (s->scope_job || s->fifo_fd < 0)
+ if (s->fifo_fd < 0)
return SESSION_OPENING;
if (session_is_active(s))
int session_kill(Session *s, KillWho who, int signo) {
assert(s);
- if (!s->scope)
- return -ESRCH;
+ if (who == KILL_LEADER) {
+ if (s->leader <= 0)
+ return -ESRCH;
+
+ /* FIXME: verify that leader is in cgroup? */
- return manager_kill_unit(s->manager, s->scope, who, signo, NULL);
+ 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 {
+ bool sigcont = false;
+ bool ignore_self = true;
+ bool rem = true;
+ return cg_kill_recursive (SYSTEMD_CGROUP_CONTROLLER, s->id, signo,
+ sigcont, ignore_self, rem, NULL);
+ }
}
static int session_open_vt(Session *s) {
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 -errno;
- }
+ if (s->vtfd < 0)
+ return log_error_errno(errno, "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_prepare_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 = fchown(vt, s->user->uid, -1);
- if (r < 0)
+ 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)
+ 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)
- goto error;
-
- sigemptyset(&mask);
- sigaddset(&mask, SIGUSR1);
- sigprocmask(SIG_BLOCK, &mask, NULL);
-
- r = sd_event_add_signal(s->manager->event, &s->vt_source, SIGUSR1, session_vt_fn, s);
- if (r < 0)
+ 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 = SIGUSR1;
- mode.acqsig = SIGUSR1;
+ mode.relsig = SIGRTMIN;
+ mode.acqsig = SIGRTMIN + 1;
r = ioctl(vt, VT_SETMODE, &mode);
- if (r < 0)
+ if (r < 0) {
+ r = -errno;
+ 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) {
if (vt < 0)
return;
- s->vt_source = sd_event_source_unref(s->vt_source);
-
- 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);
+ (void) ioctl(vt, KDSKBMODE, kb);
mode.mode = VT_AUTO;
- ioctl(vt, VT_SETMODE, &mode);
+ (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_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);
- s->controller = NULL;
+ if (!s->controller)
+ return;
- /* 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);
+ name = s->controller;
- if (!name)
- session_restore_vt(s);
- }
+ /* 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;
- s->controller = name;
- session_save(s);
+ while ((sd = hashmap_first(s->devices)))
+ session_device_free(sd);
+
+ s->controller = NULL;
+ manager_drop_busname(s->manager, name);
}
int session_set_controller(Session *s, const char *sender, bool force) {
- char *t;
+ _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);
+ r = manager_watch_busname(s->manager, name);
+ if (r)
return r;
- }
-
- session_swap_controller(s, t);
/* When setting a session controller, we forcibly mute the VT and set
* it into graphics-mode. Applications can override that by changing
* exits.
* If logind crashes/restarts, we restore the controller during restart
* or reset the VT in case it crashed/exited, too. */
- session_prepare_vt(s);
+ r = session_prepare_vt(s);
+ if (r < 0) {
+ manager_drop_busname(s->manager, name);
+ 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);
+ session_release_controller(s, false);
+ session_save(s);
+ session_restore_vt(s);
}
static const char* const session_state_table[_SESSION_STATE_MAX] = {
[SESSION_X11] = "x11",
[SESSION_WAYLAND] = "wayland",
[SESSION_MIR] = "mir",
+ [SESSION_WEB] = "web",
};
DEFINE_STRING_TABLE_LOOKUP(session_type, SessionType);
~ianmdlvl / elogind.git / blobdiff