static int scope_load(Unit *u) {
Scope *s = SCOPE(u);
int r;
assert(s);
assert(u->load_state == UNIT_STUB);
if (!u->transient && !MANAGER_IS_RELOADING(u->manager))
/* Refuse to load non-transient scope units, but allow them while reloading. */
return -ENOENT;
r = scope_load_init_scope(u);
if (r < 0)
return r;
r = unit_load_fragment_and_dropin_optional(u);
if (r < 0)
return r;
if (u->load_state == UNIT_LOADED) {
r = unit_patch_contexts(u);
if (r < 0)
return r;
r = unit_set_default_slice(u);
if (r < 0)
return r;
r = scope_add_default_dependencies(s);
if (r < 0)
return r;
}
return scope_verify(s);
}
static int scope_verify(Scope *s) {
assert(s);
if (UNIT(s)->load_state != UNIT_LOADED)
return 0;
if (set_isempty(UNIT(s)->pids) &&
!MANAGER_IS_RELOADING(UNIT(s)->manager) &&
!unit_has_name(UNIT(s), SPECIAL_INIT_SCOPE)) {
log_unit_error(UNIT(s), "Scope has no PIDs. Refusing.");
return -ENOENT;
}
return 0;
}
static int scope_start(Unit *u) {
Scope *s = SCOPE(u);
int r;
assert(s);
if (unit_has_name(u, SPECIAL_INIT_SCOPE))
return -EPERM;
if (s->state == SCOPE_FAILED)
return -EPERM;
/* We can't fulfill this right now, please try again later */
if (IN_SET(s->state, SCOPE_STOP_SIGTERM, SCOPE_STOP_SIGKILL))
return -EAGAIN;
assert(s->state == SCOPE_DEAD);
if (!u->transient && !MANAGER_IS_RELOADING(u->manager))
return -ENOENT;
(void) bus_scope_track_controller(s);
r = unit_acquire_invocation_id(u);
if (r < 0)
return r;
(void) unit_realize_cgroup(u);
(void) unit_reset_cpu_accounting(u);
(void) unit_reset_ip_accounting(u);
unit_export_state_files(UNIT(s));
r = unit_attach_pids_to_cgroup(u, UNIT(s)->pids, NULL);
if (r < 0) {
log_unit_warning_errno(UNIT(s), r, "Failed to add PIDs to scope's control group: %m");
scope_enter_dead(s, SCOPE_FAILURE_RESOURCES);
return r;
}
s->result = SCOPE_SUCCESS;
scope_set_state(s, SCOPE_RUNNING);
/* Start watching the PIDs currently in the scope */
(void) unit_enqueue_rewatch_pids(UNIT(s));
return 1;
}
static int scope_start(Unit *u) {
Scope *s = SCOPE(u);
int r;
assert(s);
if (unit_has_name(u, SPECIAL_INIT_SCOPE))
return -EPERM;
if (s->state == SCOPE_FAILED)
return -EPERM;
/* We can't fulfill this right now, please try again later */
if (s->state == SCOPE_STOP_SIGTERM ||
s->state == SCOPE_STOP_SIGKILL)
return -EAGAIN;
assert(s->state == SCOPE_DEAD);
if (!u->transient && !MANAGER_IS_RELOADING(u->manager))
return -ENOENT;
(void) unit_realize_cgroup(u);
(void) unit_reset_cpu_usage(u);
r = unit_attach_pids_to_cgroup(u);
if (r < 0) {
log_unit_warning_errno(UNIT(s), r, "Failed to add PIDs to scope's control group: %m");
scope_enter_dead(s, SCOPE_FAILURE_RESOURCES);
return r;
}
s->result = SCOPE_SUCCESS;
scope_set_state(s, SCOPE_RUNNING);
return 1;
}