+++ /dev/null
-/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
-
-/***
- This file is part of systemd.
-
- Copyright 2013 Lennart Poettering
-
- systemd is free software; you can redistribute it and/or modify it
- under the terms of the GNU Lesser General Public License as published by
- the Free Software Foundation; either version 2.1 of the License, or
- (at your option) any later version.
-
- systemd is distributed in the hope that it will be useful, but
- WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- Lesser General Public License for more details.
-
- You should have received a copy of the GNU Lesser General Public License
- along with systemd; If not, see <http://www.gnu.org/licenses/>.
-***/
-
-#include <errno.h>
-#include <unistd.h>
-
-#include "unit.h"
-#include "scope.h"
-#include "log.h"
-#include "dbus-scope.h"
-#include "special.h"
-#include "unit-name.h"
-#include "load-dropin.h"
-
-static const UnitActiveState state_translation_table[_SCOPE_STATE_MAX] = {
- [SCOPE_DEAD] = UNIT_INACTIVE,
- [SCOPE_RUNNING] = UNIT_ACTIVE,
- [SCOPE_ABANDONED] = UNIT_ACTIVE,
- [SCOPE_STOP_SIGTERM] = UNIT_DEACTIVATING,
- [SCOPE_STOP_SIGKILL] = UNIT_DEACTIVATING,
- [SCOPE_FAILED] = UNIT_FAILED
-};
-
-static int scope_dispatch_timer(sd_event_source *source, usec_t usec, void *userdata);
-
-static void scope_init(Unit *u) {
- Scope *s = SCOPE(u);
-
- assert(u);
- assert(u->load_state == UNIT_STUB);
-
- s->timeout_stop_usec = u->manager->default_timeout_stop_usec;
-
- UNIT(s)->ignore_on_isolate = true;
- UNIT(s)->ignore_on_snapshot = true;
-}
-
-static void scope_done(Unit *u) {
- Scope *s = SCOPE(u);
-
- assert(u);
-
- free(s->controller);
-
- s->timer_event_source = sd_event_source_unref(s->timer_event_source);
-}
-
-static int scope_arm_timer(Scope *s) {
- int r;
-
- assert(s);
-
- if (s->timeout_stop_usec <= 0) {
- s->timer_event_source = sd_event_source_unref(s->timer_event_source);
- return 0;
- }
-
- if (s->timer_event_source) {
- r = sd_event_source_set_time(s->timer_event_source, now(CLOCK_MONOTONIC) + s->timeout_stop_usec);
- if (r < 0)
- return r;
-
- return sd_event_source_set_enabled(s->timer_event_source, SD_EVENT_ONESHOT);
- }
-
- return sd_event_add_time(
- UNIT(s)->manager->event,
- &s->timer_event_source,
- CLOCK_MONOTONIC,
- now(CLOCK_MONOTONIC) + s->timeout_stop_usec, 0,
- scope_dispatch_timer, s);
-}
-
-static void scope_set_state(Scope *s, ScopeState state) {
- ScopeState old_state;
- assert(s);
-
- old_state = s->state;
- s->state = state;
-
- if (!IN_SET(state, SCOPE_STOP_SIGTERM, SCOPE_STOP_SIGKILL))
- s->timer_event_source = sd_event_source_unref(s->timer_event_source);
-
- if (IN_SET(state, SCOPE_DEAD, SCOPE_FAILED))
- unit_unwatch_all_pids(UNIT(s));
-
- if (state != old_state)
- log_debug("%s changed %s -> %s", UNIT(s)->id, scope_state_to_string(old_state), scope_state_to_string(state));
-
- unit_notify(UNIT(s), state_translation_table[old_state], state_translation_table[state], true);
-}
-
-static int scope_add_default_dependencies(Scope *s) {
- int r;
-
- assert(s);
-
- /* Make sure scopes are unloaded on shutdown */
- r = unit_add_two_dependencies_by_name(
- UNIT(s),
- UNIT_BEFORE, UNIT_CONFLICTS,
- SPECIAL_SHUTDOWN_TARGET, NULL, true);
- if (r < 0)
- return r;
-
- return 0;
-}
-
-static int scope_verify(Scope *s) {
- assert(s);
-
- if (UNIT(s)->load_state != UNIT_LOADED)
- return 0;
-
- if (set_isempty(UNIT(s)->pids) && UNIT(s)->manager->n_reloading <= 0) {
- log_unit_error(UNIT(s)->id, "Scope %s has no PIDs. Refusing.", UNIT(s)->id);
- return -EINVAL;
- }
-
- return 0;
-}
-
-static int scope_load(Unit *u) {
- Scope *s = SCOPE(u);
- int r;
-
- assert(s);
- assert(u->load_state == UNIT_STUB);
-
- if (!u->transient && UNIT(s)->manager->n_reloading <= 0)
- return -ENOENT;
-
- u->load_state = UNIT_LOADED;
-
- r = unit_load_dropin(u);
- if (r < 0)
- return r;
-
- r = unit_patch_contexts(u);
- if (r < 0)
- return r;
-
- r = unit_add_default_slice(u, &s->cgroup_context);
- if (r < 0)
- return r;
-
- if (u->default_dependencies) {
- r = scope_add_default_dependencies(s);
- if (r < 0)
- return r;
- }
-
- return scope_verify(s);
-}
-
-static int scope_coldplug(Unit *u, Hashmap *deferred_work) {
- Scope *s = SCOPE(u);
- int r;
-
- assert(s);
- assert(s->state == SCOPE_DEAD);
-
- if (s->deserialized_state != s->state) {
-
- if (IN_SET(s->deserialized_state, SCOPE_STOP_SIGKILL, SCOPE_STOP_SIGTERM)) {
- r = scope_arm_timer(s);
- if (r < 0)
- return r;
- }
-
- if (!IN_SET(s->deserialized_state, SCOPE_DEAD, SCOPE_FAILED))
- unit_watch_all_pids(UNIT(s));
-
- scope_set_state(s, s->deserialized_state);
- }
-
- return 0;
-}
-
-static void scope_dump(Unit *u, FILE *f, const char *prefix) {
- Scope *s = SCOPE(u);
-
- assert(s);
- assert(f);
-
- fprintf(f,
- "%sScope State: %s\n"
- "%sResult: %s\n",
- prefix, scope_state_to_string(s->state),
- prefix, scope_result_to_string(s->result));
-
- cgroup_context_dump(&s->cgroup_context, f, prefix);
- kill_context_dump(&s->kill_context, f, prefix);
-}
-
-static void scope_enter_dead(Scope *s, ScopeResult f) {
- assert(s);
-
- if (f != SCOPE_SUCCESS)
- s->result = f;
-
- scope_set_state(s, s->result != SCOPE_SUCCESS ? SCOPE_FAILED : SCOPE_DEAD);
-}
-
-static void scope_enter_signal(Scope *s, ScopeState state, ScopeResult f) {
- bool skip_signal = false;
- int r;
-
- assert(s);
-
- if (f != SCOPE_SUCCESS)
- s->result = f;
-
- unit_watch_all_pids(UNIT(s));
-
- /* If we have a controller set let's ask the controller nicely
- * to terminate the scope, instead of us going directly into
- * SIGTERM beserk mode */
- if (state == SCOPE_STOP_SIGTERM)
- skip_signal = bus_scope_send_request_stop(s) > 0;
-
- if (!skip_signal) {
- r = unit_kill_context(
- UNIT(s),
- &s->kill_context,
- state != SCOPE_STOP_SIGTERM ? KILL_KILL : KILL_TERMINATE,
- -1, -1, false);
- if (r < 0)
- goto fail;
- } else
- r = 1;
-
- if (r > 0) {
- r = scope_arm_timer(s);
- if (r < 0)
- goto fail;
-
- scope_set_state(s, state);
- } else if (state == SCOPE_STOP_SIGTERM)
- scope_enter_signal(s, SCOPE_STOP_SIGKILL, SCOPE_SUCCESS);
- else
- scope_enter_dead(s, SCOPE_SUCCESS);
-
- return;
-
-fail:
- log_unit_warning(UNIT(s)->id,
- "%s failed to kill processes: %s", UNIT(s)->id, strerror(-r));
-
- scope_enter_dead(s, SCOPE_FAILURE_RESOURCES);
-}
-
-static int scope_start(Unit *u) {
- Scope *s = SCOPE(u);
- int r;
-
- assert(s);
-
- if (s->state == SCOPE_FAILED)
- return -EPERM;
-
- if (s->state == SCOPE_STOP_SIGTERM ||
- s->state == SCOPE_STOP_SIGKILL)
- return -EAGAIN;
-
- assert(s->state == SCOPE_DEAD);
-
- if (!u->transient && UNIT(s)->manager->n_reloading <= 0)
- return -ENOENT;
-
- (void) unit_realize_cgroup(u);
- (void) unit_reset_cpu_usage(u);
-
- r = unit_attach_pids_to_cgroup(u);
- if (r < 0)
- return r;
-
- s->result = SCOPE_SUCCESS;
-
- scope_set_state(s, SCOPE_RUNNING);
- return 1;
-}
-
-static int scope_stop(Unit *u) {
- Scope *s = SCOPE(u);
-
- assert(s);
-
- if (s->state == SCOPE_STOP_SIGTERM ||
- s->state == SCOPE_STOP_SIGKILL)
- return 0;
-
- assert(s->state == SCOPE_RUNNING ||
- s->state == SCOPE_ABANDONED);
-
- scope_enter_signal(s, SCOPE_STOP_SIGTERM, SCOPE_SUCCESS);
- return 1;
-}
-
-static void scope_reset_failed(Unit *u) {
- Scope *s = SCOPE(u);
-
- assert(s);
-
- if (s->state == SCOPE_FAILED)
- scope_set_state(s, SCOPE_DEAD);
-
- s->result = SCOPE_SUCCESS;
-}
-
-static int scope_kill(Unit *u, KillWho who, int signo, sd_bus_error *error) {
- return unit_kill_common(u, who, signo, -1, -1, error);
-}
-
-static int scope_get_timeout(Unit *u, uint64_t *timeout) {
- Scope *s = SCOPE(u);
- int r;
-
- if (!s->timer_event_source)
- return 0;
-
- r = sd_event_source_get_time(s->timer_event_source, timeout);
- if (r < 0)
- return r;
-
- return 1;
-}
-
-static int scope_serialize(Unit *u, FILE *f, FDSet *fds) {
- Scope *s = SCOPE(u);
-
- assert(s);
- assert(f);
- assert(fds);
-
- unit_serialize_item(u, f, "state", scope_state_to_string(s->state));
- return 0;
-}
-
-static int scope_deserialize_item(Unit *u, const char *key, const char *value, FDSet *fds) {
- Scope *s = SCOPE(u);
-
- assert(u);
- assert(key);
- assert(value);
- assert(fds);
-
- if (streq(key, "state")) {
- ScopeState state;
-
- state = scope_state_from_string(value);
- if (state < 0)
- log_debug("Failed to parse state value %s", value);
- else
- s->deserialized_state = state;
-
- } else
- log_debug("Unknown serialization key '%s'", key);
-
- return 0;
-}
-
-static bool scope_check_gc(Unit *u) {
- assert(u);
-
- /* Never clean up scopes that still have a process around,
- * even if the scope is formally dead. */
-
- if (u->cgroup_path) {
- int r;
-
- r = cg_is_empty_recursive(SYSTEMD_CGROUP_CONTROLLER, u->cgroup_path, true);
- if (r <= 0)
- return true;
- }
-
- return false;
-}
-
-static void scope_notify_cgroup_empty_event(Unit *u) {
- Scope *s = SCOPE(u);
- assert(u);
-
- log_unit_debug(u->id, "%s: cgroup is empty", u->id);
-
- if (IN_SET(s->state, SCOPE_RUNNING, SCOPE_ABANDONED, SCOPE_STOP_SIGTERM, SCOPE_STOP_SIGKILL))
- scope_enter_dead(s, SCOPE_SUCCESS);
-}
-
-static void scope_sigchld_event(Unit *u, pid_t pid, int code, int status) {
-
- /* If we get a SIGCHLD event for one of the processes we were
- interested in, then we look for others to watch, under the
- assumption that we'll sooner or later get a SIGCHLD for
- them, as the original process we watched was probably the
- parent of them, and they are hence now our children. */
-
- unit_tidy_watch_pids(u, 0, 0);
- unit_watch_all_pids(u);
-
- /* If the PID set is empty now, then let's finish this off */
- if (set_isempty(u->pids))
- scope_notify_cgroup_empty_event(u);
-}
-
-static int scope_dispatch_timer(sd_event_source *source, usec_t usec, void *userdata) {
- Scope *s = SCOPE(userdata);
-
- assert(s);
- assert(s->timer_event_source == source);
-
- switch (s->state) {
-
- case SCOPE_STOP_SIGTERM:
- if (s->kill_context.send_sigkill) {
- log_unit_warning(UNIT(s)->id, "%s stopping timed out. Killing.", UNIT(s)->id);
- scope_enter_signal(s, SCOPE_STOP_SIGKILL, SCOPE_FAILURE_TIMEOUT);
- } else {
- log_unit_warning(UNIT(s)->id, "%s stopping timed out. Skipping SIGKILL.", UNIT(s)->id);
- scope_enter_dead(s, SCOPE_FAILURE_TIMEOUT);
- }
-
- break;
-
- case SCOPE_STOP_SIGKILL:
- log_unit_warning(UNIT(s)->id, "%s still around after SIGKILL. Ignoring.", UNIT(s)->id);
- scope_enter_dead(s, SCOPE_FAILURE_TIMEOUT);
- break;
-
- default:
- assert_not_reached("Timeout at wrong time.");
- }
-
- return 0;
-}
-
-int scope_abandon(Scope *s) {
- assert(s);
-
- if (!IN_SET(s->state, SCOPE_RUNNING, SCOPE_ABANDONED))
- return -ESTALE;
-
- free(s->controller);
- s->controller = NULL;
-
- /* The client is no longer watching the remaining processes,
- * so let's step in here, under the assumption that the
- * remaining processes will be sooner or later reassigned to
- * us as parent. */
-
- unit_tidy_watch_pids(UNIT(s), 0, 0);
- unit_watch_all_pids(UNIT(s));
-
- /* If the PID set is empty now, then let's finish this off */
- if (set_isempty(UNIT(s)->pids))
- scope_notify_cgroup_empty_event(UNIT(s));
- else
- scope_set_state(s, SCOPE_ABANDONED);
-
- return 0;
-}
-
-_pure_ static UnitActiveState scope_active_state(Unit *u) {
- assert(u);
-
- return state_translation_table[SCOPE(u)->state];
-}
-
-_pure_ static const char *scope_sub_state_to_string(Unit *u) {
- assert(u);
-
- return scope_state_to_string(SCOPE(u)->state);
-}
-
-static const char* const scope_state_table[_SCOPE_STATE_MAX] = {
- [SCOPE_DEAD] = "dead",
- [SCOPE_RUNNING] = "running",
- [SCOPE_ABANDONED] = "abandoned",
- [SCOPE_STOP_SIGTERM] = "stop-sigterm",
- [SCOPE_STOP_SIGKILL] = "stop-sigkill",
- [SCOPE_FAILED] = "failed",
-};
-
-DEFINE_STRING_TABLE_LOOKUP(scope_state, ScopeState);
-
-static const char* const scope_result_table[_SCOPE_RESULT_MAX] = {
- [SCOPE_SUCCESS] = "success",
- [SCOPE_FAILURE_RESOURCES] = "resources",
- [SCOPE_FAILURE_TIMEOUT] = "timeout",
-};
-
-DEFINE_STRING_TABLE_LOOKUP(scope_result, ScopeResult);
-
-const UnitVTable scope_vtable = {
- .object_size = sizeof(Scope),
- .cgroup_context_offset = offsetof(Scope, cgroup_context),
- .kill_context_offset = offsetof(Scope, kill_context),
-
- .sections =
- "Unit\0"
- "Scope\0"
- "Install\0",
- .private_section = "Scope",
-
- .no_alias = true,
- .no_instances = true,
-
- .init = scope_init,
- .load = scope_load,
- .done = scope_done,
-
- .coldplug = scope_coldplug,
-
- .dump = scope_dump,
-
- .start = scope_start,
- .stop = scope_stop,
-
- .kill = scope_kill,
-
- .get_timeout = scope_get_timeout,
-
- .serialize = scope_serialize,
- .deserialize_item = scope_deserialize_item,
-
- .active_state = scope_active_state,
- .sub_state_to_string = scope_sub_state_to_string,
-
- .check_gc = scope_check_gc,
-
- .sigchld_event = scope_sigchld_event,
-
- .reset_failed = scope_reset_failed,
-
- .notify_cgroup_empty = scope_notify_cgroup_empty_event,
-
- .bus_interface = "org.freedesktop.systemd1.Scope",
- .bus_vtable = bus_scope_vtable,
- .bus_set_property = bus_scope_set_property,
- .bus_commit_properties = bus_scope_commit_properties,
-
- .can_transient = true
-};
~ianmdlvl / elogind.git / blobdiff