chiark / gitweb /
Prep v225: Applying various fixes and changes to src/login that got lost during git...
[elogind.git] / src / login / logind-session.c
index d916719..92a6027 100644 (file)
@@ -37,6 +37,8 @@
 #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)
 
@@ -163,11 +165,11 @@ int session_save(Session *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);
 
@@ -215,7 +217,7 @@ int session_save(Session *s) {
                 escaped = cescape(s->remote_host);
                 if (!escaped) {
                         r = -ENOMEM;
-                        goto finish;
+                        goto fail;
                 }
 
                 fprintf(f, "REMOTE_HOST=%s\n", escaped);
@@ -227,7 +229,7 @@ int session_save(Session *s) {
                 escaped = cescape(s->remote_user);
                 if (!escaped) {
                         r = -ENOMEM;
-                        goto finish;
+                        goto fail;
                 }
 
                 fprintf(f, "REMOTE_USER=%s\n", escaped);
@@ -239,7 +241,7 @@ int session_save(Session *s) {
                 escaped = cescape(s->service);
                 if (!escaped) {
                         r = -ENOMEM;
-                        goto finish;
+                        goto fail;
                 }
 
                 fprintf(f, "SERVICE=%s\n", escaped);
@@ -252,7 +254,7 @@ int session_save(Session *s) {
                 escaped = cescape(s->desktop);
                 if (!escaped) {
                         r = -ENOMEM;
-                        goto finish;
+                        goto fail;
                 }
 
                 fprintf(f, "DESKTOP=%s\n", escaped);
@@ -262,7 +264,7 @@ int session_save(Session *s) {
                 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="PID_FMT"\n", s->leader);
@@ -280,27 +282,33 @@ int session_save(Session *s) {
         if (s->controller)
                 fprintf(f, "CONTROLLER=%s\n", s->controller);
 
-        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;
         }
 
-finish:
-        if (r < 0)
-                log_error_errno(r, "Failed to save session data %s: %m", s->state_file);
+        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,
-                *pos = NULL,
+                *position = NULL,
                 *leader = NULL,
                 *type = NULL,
                 *class = NULL,
@@ -327,7 +335,7 @@ int session_load(Session *s) {
                            "DESKTOP",        &s->desktop,
                            "VTNR",           &vtnr,
                            "STATE",          &state,
-                           "POS",            &pos,
+                           "POSITION",       &position,
                            "LEADER",         &leader,
                            "TYPE",           &type,
                            "CLASS",          &class,
@@ -386,10 +394,10 @@ int session_load(Session *s) {
         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);
         }
 
@@ -511,7 +519,7 @@ static int session_start_scope(Session *s) {
                 if (!scope)
                         return log_oom();
 
-                r = manager_start_scope(s->manager, scope, s->leader, s->user->slice, description, "logind.service", "systemd-user-sessions.service", &error, &job);
+                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);
@@ -628,6 +636,9 @@ int session_stop(Session *s, bool force) {
 
         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);
 
@@ -645,7 +656,6 @@ int session_stop(Session *s, bool force) {
 }
 
 int session_finalize(Session *s) {
-        int r = 0;
         SessionDevice *sd;
 
         assert(s);
@@ -664,11 +674,14 @@ int session_finalize(Session *s) {
 
         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);
 
@@ -688,7 +701,7 @@ int session_finalize(Session *s) {
         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) {
@@ -973,7 +986,7 @@ static int session_open_vt(Session *s) {
                 return s->vtfd;
 
         sprintf(path, "/dev/tty%u", s->vtnr);
-        s->vtfd = open(path, O_RDWR | O_CLOEXEC | O_NONBLOCK | O_NOCTTY);
+        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);
 
@@ -1037,7 +1050,18 @@ void session_restore_vt(Session *s) {
         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;
 
@@ -1106,7 +1130,18 @@ static void session_release_controller(Session *s, bool notify) {
                 session_device_free(sd);
 
         s->controller = NULL;
-        manager_drop_busname(s->manager, name);
+        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) {
@@ -1125,8 +1160,13 @@ int session_set_controller(Session *s, const char *sender, bool force) {
         if (!name)
                 return -ENOMEM;
 
-        r = manager_watch_busname(s->manager, name);
-        if (r)
+        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
@@ -1139,7 +1179,7 @@ int session_set_controller(Session *s, const char *sender, bool force) {
          * or reset the VT in case it crashed/exited, too. */
         r = session_prepare_vt(s);
         if (r < 0) {
-                manager_drop_busname(s->manager, name);
+                s->track = sd_bus_track_unref(s->track);
                 return r;
         }
 
@@ -1157,6 +1197,7 @@ void session_drop_controller(Session *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);