+ /* Fail if I am already a session leader */
+ if (group_leader->signal->leader)
+ goto out;
+
+ session = group_leader->pid;
+ /* Fail if a process group id already exists that equals the
+ * proposed session id.
+ *
+ * Don't check if session id == 1 because kernel threads use this
+ * session id and so the check will always fail and make it so
+ * init cannot successfully call setsid.
+ */
+ if (session > 1 && find_task_by_pid_type(PIDTYPE_PGID, session))