+int session_kill(Session *s, KillWho who, int signo) {
+ int r = 0;
+ Set *pid_set = NULL;
+
+ assert(s);
+
+ if (!s->cgroup_path)
+ return -ESRCH;
+
+ if (s->leader <= 0 && who == KILL_LEADER)
+ return -ESRCH;
+
+ if (s->leader > 0)
+ if (kill(s->leader, signo) < 0)
+ r = -errno;
+
+ if (who == KILL_ALL) {
+ int q;
+
+ pid_set = set_new(trivial_hash_func, trivial_compare_func);
+ if (!pid_set)
+ return -ENOMEM;
+
+ if (s->leader > 0) {
+ q = set_put(pid_set, LONG_TO_PTR(s->leader));
+ if (q < 0)
+ r = q;
+ }
+
+ q = cg_kill_recursive(SYSTEMD_CGROUP_CONTROLLER, s->cgroup_path, signo, false, true, false, pid_set);
+ if (q < 0)
+ if (q != -EAGAIN && q != -ESRCH && q != -ENOENT)
+ r = q;
+ }
+
+ if (pid_set)
+ set_free(pid_set);
+
+ return r;
+}
+