systemctl: introduce systemctl kill

1 files changed, 58 insertions, 0 deletions

diff --git a/src/service.c b/src/service.c
index 3ebe60e46e..6d6c540a72 100644
--- a/src/service.c
+++ b/src/service.c
@@ -3145,6 +3145,62 @@ static void service_reset_failed(Unit *u) {
         s->failure = false;
 }
 
+static int service_kill(Unit *u, KillWho who, KillMode mode, int signo, DBusError *error) {
+        Service *s = SERVICE(u);
+        int r = 0;
+        Set *pid_set = NULL;
+
+        assert(s);
+
+        if (s->main_pid <= 0 && who == KILL_MAIN) {
+                dbus_set_error(error, BUS_ERROR_NO_SUCH_PROCESS, "No main process to kill");
+                return -EINVAL;
+        }
+
+        if (s->control_pid <= 0 && who == KILL_CONTROL) {
+                dbus_set_error(error, BUS_ERROR_NO_SUCH_PROCESS, "No control process to kill");
+                return -ENOENT;
+        }
+
+        if (s->control_pid > 0)
+                if (kill(mode == KILL_PROCESS_GROUP ? -s->control_pid : s->control_pid, signo) < 0)
+                        r = -errno;
+
+        if (s->main_pid > 0)
+                if (kill(mode == KILL_PROCESS_GROUP ? -s->main_pid : s->main_pid, signo) < 0)
+                        r = -errno;
+
+        if (mode == KILL_CONTROL_GROUP) {
+                int q;
+
+                if (!(pid_set = set_new(trivial_hash_func, trivial_compare_func)))
+                        return -ENOMEM;
+
+                /* Exclude the control/main pid from being killed via the cgroup */
+                if (s->control_pid > 0)
+                        if ((q = set_put(pid_set, LONG_TO_PTR(s->control_pid))) < 0) {
+                                r = q;
+                                goto finish;
+                        }
+
+                if (s->main_pid > 0)
+                        if ((q = set_put(pid_set, LONG_TO_PTR(s->main_pid))) < 0) {
+                                r = q;
+                                goto finish;
+                        }
+
+                if ((q = cgroup_bonding_kill_list(s->meta.cgroup_bondings, signo, pid_set)) < 0)
+                        if (r != -EAGAIN && r != -ESRCH && r != -ENOENT)
+                                r = q;
+        }
+
+finish:
+        if (pid_set)
+                set_free(pid_set);
+
+        return r;
+}
+
 static const char* const service_state_table[_SERVICE_STATE_MAX] = {
         [SERVICE_DEAD] = "dead",
         [SERVICE_START_PRE] = "start-pre",
@@ -3222,6 +3278,8 @@ const UnitVTable service_vtable = {
 
         .can_reload = service_can_reload,
 
+        .kill = service_kill,
+
         .serialize = service_serialize,
         .deserialize_item = service_deserialize_item,