+#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 {
+ 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);
+ }
+#endif // 0
+}
+
+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(s->vtfd, "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 = 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 = 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 = 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 = 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;