/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/ /*** This file is part of systemd. Copyright 2010 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 . ***/ #include #include #include #include #include #include #include #include #include #include "systemd/sd-id128.h" #include "systemd/sd-messages.h" #include "set.h" #include "unit.h" #include "macro.h" #include "strv.h" #include "path-util.h" #include "load-fragment.h" #include "load-dropin.h" #include "log.h" #include "unit-name.h" #include "dbus-unit.h" #include "special.h" #include "cgroup-util.h" #include "missing.h" #include "cgroup-attr.h" #include "mkdir.h" #include "label.h" #include "fileio-label.h" const UnitVTable * const unit_vtable[_UNIT_TYPE_MAX] = { [UNIT_SERVICE] = &service_vtable, [UNIT_TIMER] = &timer_vtable, [UNIT_SOCKET] = &socket_vtable, [UNIT_TARGET] = &target_vtable, [UNIT_DEVICE] = &device_vtable, [UNIT_MOUNT] = &mount_vtable, [UNIT_AUTOMOUNT] = &automount_vtable, [UNIT_SNAPSHOT] = &snapshot_vtable, [UNIT_SWAP] = &swap_vtable, [UNIT_PATH] = &path_vtable }; Unit *unit_new(Manager *m, size_t size) { Unit *u; assert(m); assert(size >= sizeof(Unit)); u = malloc0(size); if (!u) return NULL; u->names = set_new(string_hash_func, string_compare_func); if (!u->names) { free(u); return NULL; } u->manager = m; u->type = _UNIT_TYPE_INVALID; u->deserialized_job = _JOB_TYPE_INVALID; u->default_dependencies = true; u->unit_file_state = _UNIT_FILE_STATE_INVALID; return u; } bool unit_has_name(Unit *u, const char *name) { assert(u); assert(name); return !!set_get(u->names, (char*) name); } int unit_add_name(Unit *u, const char *text) { UnitType t; char *s, *i = NULL; int r; assert(u); assert(text); if (unit_name_is_template(text)) { if (!u->instance) return -EINVAL; s = unit_name_replace_instance(text, u->instance); } else s = strdup(text); if (!s) return -ENOMEM; if (!unit_name_is_valid(s, false)) { r = -EINVAL; goto fail; } assert_se((t = unit_name_to_type(s)) >= 0); if (u->type != _UNIT_TYPE_INVALID && t != u->type) { r = -EINVAL; goto fail; } if ((r = unit_name_to_instance(s, &i)) < 0) goto fail; if (i && unit_vtable[t]->no_instances) { r = -EINVAL; goto fail; } /* Ensure that this unit is either instanced or not instanced, * but not both. */ if (u->type != _UNIT_TYPE_INVALID && !u->instance != !i) { r = -EINVAL; goto fail; } if (unit_vtable[t]->no_alias && !set_isempty(u->names) && !set_get(u->names, s)) { r = -EEXIST; goto fail; } if (hashmap_size(u->manager->units) >= MANAGER_MAX_NAMES) { r = -E2BIG; goto fail; } if ((r = set_put(u->names, s)) < 0) { if (r == -EEXIST) r = 0; goto fail; } if ((r = hashmap_put(u->manager->units, s, u)) < 0) { set_remove(u->names, s); goto fail; } if (u->type == _UNIT_TYPE_INVALID) { u->type = t; u->id = s; u->instance = i; LIST_PREPEND(Unit, units_by_type, u->manager->units_by_type[t], u); if (UNIT_VTABLE(u)->init) UNIT_VTABLE(u)->init(u); } else free(i); unit_add_to_dbus_queue(u); return 0; fail: free(s); free(i); return r; } int unit_choose_id(Unit *u, const char *name) { char *s, *t = NULL, *i; int r; assert(u); assert(name); if (unit_name_is_template(name)) { if (!u->instance) return -EINVAL; if (!(t = unit_name_replace_instance(name, u->instance))) return -ENOMEM; name = t; } /* Selects one of the names of this unit as the id */ s = set_get(u->names, (char*) name); free(t); if (!s) return -ENOENT; if ((r = unit_name_to_instance(s, &i)) < 0) return r; u->id = s; free(u->instance); u->instance = i; unit_add_to_dbus_queue(u); return 0; } int unit_set_description(Unit *u, const char *description) { char *s; assert(u); if (!(s = strdup(description))) return -ENOMEM; free(u->description); u->description = s; unit_add_to_dbus_queue(u); return 0; } bool unit_check_gc(Unit *u) { assert(u); if (u->load_state == UNIT_STUB) return true; if (UNIT_VTABLE(u)->no_gc) return true; if (u->no_gc) return true; if (u->job) return true; if (u->nop_job) return true; if (unit_active_state(u) != UNIT_INACTIVE) return true; if (u->refs) return true; if (UNIT_VTABLE(u)->check_gc) if (UNIT_VTABLE(u)->check_gc(u)) return true; return false; } void unit_add_to_load_queue(Unit *u) { assert(u); assert(u->type != _UNIT_TYPE_INVALID); if (u->load_state != UNIT_STUB || u->in_load_queue) return; LIST_PREPEND(Unit, load_queue, u->manager->load_queue, u); u->in_load_queue = true; } void unit_add_to_cleanup_queue(Unit *u) { assert(u); if (u->in_cleanup_queue) return; LIST_PREPEND(Unit, cleanup_queue, u->manager->cleanup_queue, u); u->in_cleanup_queue = true; } void unit_add_to_gc_queue(Unit *u) { assert(u); if (u->in_gc_queue || u->in_cleanup_queue) return; if (unit_check_gc(u)) return; LIST_PREPEND(Unit, gc_queue, u->manager->gc_queue, u); u->in_gc_queue = true; u->manager->n_in_gc_queue ++; if (u->manager->gc_queue_timestamp <= 0) u->manager->gc_queue_timestamp = now(CLOCK_MONOTONIC); } void unit_add_to_dbus_queue(Unit *u) { assert(u); assert(u->type != _UNIT_TYPE_INVALID); if (u->load_state == UNIT_STUB || u->in_dbus_queue) return; /* Shortcut things if nobody cares */ if (!bus_has_subscriber(u->manager)) { u->sent_dbus_new_signal = true; return; } LIST_PREPEND(Unit, dbus_queue, u->manager->dbus_unit_queue, u); u->in_dbus_queue = true; } static void bidi_set_free(Unit *u, Set *s) { Iterator i; Unit *other; assert(u); /* Frees the set and makes sure we are dropped from the * inverse pointers */ SET_FOREACH(other, s, i) { UnitDependency d; for (d = 0; d < _UNIT_DEPENDENCY_MAX; d++) set_remove(other->dependencies[d], u); unit_add_to_gc_queue(other); } set_free(s); } void unit_free(Unit *u) { UnitDependency d; Iterator i; char *t; assert(u); bus_unit_send_removed_signal(u); if (u->load_state != UNIT_STUB) if (UNIT_VTABLE(u)->done) UNIT_VTABLE(u)->done(u); SET_FOREACH(t, u->names, i) hashmap_remove_value(u->manager->units, t, u); if (u->job) { Job *j = u->job; job_uninstall(j); job_free(j); } if (u->nop_job) { Job *j = u->nop_job; job_uninstall(j); job_free(j); } for (d = 0; d < _UNIT_DEPENDENCY_MAX; d++) bidi_set_free(u, u->dependencies[d]); if (u->requires_mounts_for) { LIST_REMOVE(Unit, has_requires_mounts_for, u->manager->has_requires_mounts_for, u); strv_free(u->requires_mounts_for); } if (u->type != _UNIT_TYPE_INVALID) LIST_REMOVE(Unit, units_by_type, u->manager->units_by_type[u->type], u); if (u->in_load_queue) LIST_REMOVE(Unit, load_queue, u->manager->load_queue, u); if (u->in_dbus_queue) LIST_REMOVE(Unit, dbus_queue, u->manager->dbus_unit_queue, u); if (u->in_cleanup_queue) LIST_REMOVE(Unit, cleanup_queue, u->manager->cleanup_queue, u); if (u->in_gc_queue) { LIST_REMOVE(Unit, gc_queue, u->manager->gc_queue, u); u->manager->n_in_gc_queue--; } cgroup_bonding_free_list(u->cgroup_bondings, u->manager->n_reloading <= 0); cgroup_attribute_free_list(u->cgroup_attributes); free(u->description); strv_free(u->documentation); free(u->fragment_path); free(u->source_path); free(u->instance); set_free_free(u->names); condition_free_list(u->conditions); while (u->refs) unit_ref_unset(u->refs); free(u); } UnitActiveState unit_active_state(Unit *u) { assert(u); if (u->load_state == UNIT_MERGED) return unit_active_state(unit_follow_merge(u)); /* After a reload it might happen that a unit is not correctly * loaded but still has a process around. That's why we won't * shortcut failed loading to UNIT_INACTIVE_FAILED. */ return UNIT_VTABLE(u)->active_state(u); } const char* unit_sub_state_to_string(Unit *u) { assert(u); return UNIT_VTABLE(u)->sub_state_to_string(u); } static void complete_move(Set **s, Set **other) { assert(s); assert(other); if (!*other) return; if (*s) set_move(*s, *other); else { *s = *other; *other = NULL; } } static void merge_names(Unit *u, Unit *other) { char *t; Iterator i; assert(u); assert(other); complete_move(&u->names, &other->names); set_free_free(other->names); other->names = NULL; other->id = NULL; SET_FOREACH(t, u->names, i) assert_se(hashmap_replace(u->manager->units, t, u) == 0); } static void merge_dependencies(Unit *u, Unit *other, UnitDependency d) { Iterator i; Unit *back; int r; assert(u); assert(other); assert(d < _UNIT_DEPENDENCY_MAX); /* Fix backwards pointers */ SET_FOREACH(back, other->dependencies[d], i) { UnitDependency k; for (k = 0; k < _UNIT_DEPENDENCY_MAX; k++) if ((r = set_remove_and_put(back->dependencies[k], other, u)) < 0) { if (r == -EEXIST) set_remove(back->dependencies[k], other); else assert(r == -ENOENT); } } complete_move(&u->dependencies[d], &other->dependencies[d]); set_free(other->dependencies[d]); other->dependencies[d] = NULL; } int unit_merge(Unit *u, Unit *other) { UnitDependency d; assert(u); assert(other); assert(u->manager == other->manager); assert(u->type != _UNIT_TYPE_INVALID); other = unit_follow_merge(other); if (other == u) return 0; if (u->type != other->type) return -EINVAL; if (!u->instance != !other->instance) return -EINVAL; if (other->load_state != UNIT_STUB && other->load_state != UNIT_ERROR) return -EEXIST; if (other->job) return -EEXIST; if (other->nop_job) return -EEXIST; if (!UNIT_IS_INACTIVE_OR_FAILED(unit_active_state(other))) return -EEXIST; /* Merge names */ merge_names(u, other); /* Redirect all references */ while (other->refs) unit_ref_set(other->refs, u); /* Merge dependencies */ for (d = 0; d < _UNIT_DEPENDENCY_MAX; d++) merge_dependencies(u, other, d); other->load_state = UNIT_MERGED; other->merged_into = u; /* If there is still some data attached to the other node, we * don't need it anymore, and can free it. */ if (other->load_state != UNIT_STUB) if (UNIT_VTABLE(other)->done) UNIT_VTABLE(other)->done(other); unit_add_to_dbus_queue(u); unit_add_to_cleanup_queue(other); return 0; } int unit_merge_by_name(Unit *u, const char *name) { Unit *other; int r; char *s = NULL; assert(u); assert(name); if (unit_name_is_template(name)) { if (!u->instance) return -EINVAL; if (!(s = unit_name_replace_instance(name, u->instance))) return -ENOMEM; name = s; } if (!(other = manager_get_unit(u->manager, name))) r = unit_add_name(u, name); else r = unit_merge(u, other); free(s); return r; } Unit* unit_follow_merge(Unit *u) { assert(u); while (u->load_state == UNIT_MERGED) assert_se(u = u->merged_into); return u; } int unit_add_exec_dependencies(Unit *u, ExecContext *c) { int r; assert(u); assert(c); if (c->std_output != EXEC_OUTPUT_KMSG && c->std_output != EXEC_OUTPUT_SYSLOG && c->std_output != EXEC_OUTPUT_JOURNAL && c->std_output != EXEC_OUTPUT_KMSG_AND_CONSOLE && c->std_output != EXEC_OUTPUT_SYSLOG_AND_CONSOLE && c->std_output != EXEC_OUTPUT_JOURNAL_AND_CONSOLE && c->std_error != EXEC_OUTPUT_KMSG && c->std_error != EXEC_OUTPUT_SYSLOG && c->std_error != EXEC_OUTPUT_JOURNAL && c->std_error != EXEC_OUTPUT_KMSG_AND_CONSOLE && c->std_error != EXEC_OUTPUT_JOURNAL_AND_CONSOLE && c->std_error != EXEC_OUTPUT_SYSLOG_AND_CONSOLE) return 0; /* If syslog or kernel logging is requested, make sure our own * logging daemon is run first. */ if (u->manager->running_as == SYSTEMD_SYSTEM) { r = unit_add_dependency_by_name(u, UNIT_AFTER, SPECIAL_JOURNALD_SOCKET, NULL, true); if (r < 0) return r; } return 0; } const char *unit_description(Unit *u) { assert(u); if (u->description) return u->description; return strna(u->id); } void unit_dump(Unit *u, FILE *f, const char *prefix) { char *t, **j; UnitDependency d; Iterator i; char *p2; const char *prefix2; char timestamp1[FORMAT_TIMESTAMP_MAX], timestamp2[FORMAT_TIMESTAMP_MAX], timestamp3[FORMAT_TIMESTAMP_MAX], timestamp4[FORMAT_TIMESTAMP_MAX], timespan[FORMAT_TIMESPAN_MAX]; Unit *following; assert(u); assert(u->type >= 0); if (!prefix) prefix = ""; p2 = strappend(prefix, "\t"); prefix2 = p2 ? p2 : prefix; fprintf(f, "%s-> Unit %s:\n" "%s\tDescription: %s\n" "%s\tInstance: %s\n" "%s\tUnit Load State: %s\n" "%s\tUnit Active State: %s\n" "%s\tInactive Exit Timestamp: %s\n" "%s\tActive Enter Timestamp: %s\n" "%s\tActive Exit Timestamp: %s\n" "%s\tInactive Enter Timestamp: %s\n" "%s\tGC Check Good: %s\n" "%s\tNeed Daemon Reload: %s\n", prefix, u->id, prefix, unit_description(u), prefix, strna(u->instance), prefix, unit_load_state_to_string(u->load_state), prefix, unit_active_state_to_string(unit_active_state(u)), prefix, strna(format_timestamp(timestamp1, sizeof(timestamp1), u->inactive_exit_timestamp.realtime)), prefix, strna(format_timestamp(timestamp2, sizeof(timestamp2), u->active_enter_timestamp.realtime)), prefix, strna(format_timestamp(timestamp3, sizeof(timestamp3), u->active_exit_timestamp.realtime)), prefix, strna(format_timestamp(timestamp4, sizeof(timestamp4), u->inactive_enter_timestamp.realtime)), prefix, yes_no(unit_check_gc(u)), prefix, yes_no(unit_need_daemon_reload(u))); SET_FOREACH(t, u->names, i) fprintf(f, "%s\tName: %s\n", prefix, t); STRV_FOREACH(j, u->documentation) fprintf(f, "%s\tDocumentation: %s\n", prefix, *j); if ((following = unit_following(u))) fprintf(f, "%s\tFollowing: %s\n", prefix, following->id); if (u->fragment_path) fprintf(f, "%s\tFragment Path: %s\n", prefix, u->fragment_path); if (u->source_path) fprintf(f, "%s\tSource Path: %s\n", prefix, u->source_path); if (u->job_timeout > 0) fprintf(f, "%s\tJob Timeout: %s\n", prefix, format_timespan(timespan, sizeof(timespan), u->job_timeout)); condition_dump_list(u->conditions, f, prefix); if (dual_timestamp_is_set(&u->condition_timestamp)) fprintf(f, "%s\tCondition Timestamp: %s\n" "%s\tCondition Result: %s\n", prefix, strna(format_timestamp(timestamp1, sizeof(timestamp1), u->condition_timestamp.realtime)), prefix, yes_no(u->condition_result)); for (d = 0; d < _UNIT_DEPENDENCY_MAX; d++) { Unit *other; SET_FOREACH(other, u->dependencies[d], i) fprintf(f, "%s\t%s: %s\n", prefix, unit_dependency_to_string(d), other->id); } if (!strv_isempty(u->requires_mounts_for)) { fprintf(f, "%s\tRequiresMountsFor:", prefix); STRV_FOREACH(j, u->requires_mounts_for) fprintf(f, " %s", *j); fputs("\n", f); } if (u->load_state == UNIT_LOADED) { CGroupBonding *b; CGroupAttribute *a; fprintf(f, "%s\tStopWhenUnneeded: %s\n" "%s\tRefuseManualStart: %s\n" "%s\tRefuseManualStop: %s\n" "%s\tDefaultDependencies: %s\n" "%s\tOnFailureIsolate: %s\n" "%s\tIgnoreOnIsolate: %s\n" "%s\tIgnoreOnSnapshot: %s\n", prefix, yes_no(u->stop_when_unneeded), prefix, yes_no(u->refuse_manual_start), prefix, yes_no(u->refuse_manual_stop), prefix, yes_no(u->default_dependencies), prefix, yes_no(u->on_failure_isolate), prefix, yes_no(u->ignore_on_isolate), prefix, yes_no(u->ignore_on_snapshot)); LIST_FOREACH(by_unit, b, u->cgroup_bondings) fprintf(f, "%s\tControlGroup: %s:%s\n", prefix, b->controller, b->path); LIST_FOREACH(by_unit, a, u->cgroup_attributes) { _cleanup_free_ char *v = NULL; if (a->semantics && a->semantics->map_write) a->semantics->map_write(a->semantics, a->value, &v); fprintf(f, "%s\tControlGroupAttribute: %s %s \"%s\"\n", prefix, a->controller, a->name, v ? v : a->value); } if (UNIT_VTABLE(u)->dump) UNIT_VTABLE(u)->dump(u, f, prefix2); } else if (u->load_state == UNIT_MERGED) fprintf(f, "%s\tMerged into: %s\n", prefix, u->merged_into->id); else if (u->load_state == UNIT_ERROR) fprintf(f, "%s\tLoad Error Code: %s\n", prefix, strerror(-u->load_error)); if (u->job) job_dump(u->job, f, prefix2); if (u->nop_job) job_dump(u->nop_job, f, prefix2); free(p2); } /* Common implementation for multiple backends */ int unit_load_fragment_and_dropin(Unit *u) { int r; assert(u); /* Load a .service file */ if ((r = unit_load_fragment(u)) < 0) return r; if (u->load_state == UNIT_STUB) return -ENOENT; /* Load drop-in directory data */ if ((r = unit_load_dropin(unit_follow_merge(u))) < 0) return r; return 0; } /* Common implementation for multiple backends */ int unit_load_fragment_and_dropin_optional(Unit *u) { int r; assert(u); /* Same as unit_load_fragment_and_dropin(), but whether * something can be loaded or not doesn't matter. */ /* Load a .service file */ if ((r = unit_load_fragment(u)) < 0) return r; if (u->load_state == UNIT_STUB) u->load_state = UNIT_LOADED; /* Load drop-in directory data */ if ((r = unit_load_dropin(unit_follow_merge(u))) < 0) return r; return 0; } int unit_add_default_target_dependency(Unit *u, Unit *target) { assert(u); assert(target); if (target->type != UNIT_TARGET) return 0; /* Only add the dependency if both units are loaded, so that * that loop check below is reliable */ if (u->load_state != UNIT_LOADED || target->load_state != UNIT_LOADED) return 0; /* If either side wants no automatic dependencies, then let's * skip this */ if (!u->default_dependencies || !target->default_dependencies) return 0; /* Don't create loops */ if (set_get(target->dependencies[UNIT_BEFORE], u)) return 0; return unit_add_dependency(target, UNIT_AFTER, u, true); } static int unit_add_default_dependencies(Unit *u) { static const UnitDependency deps[] = { UNIT_REQUIRED_BY, UNIT_REQUIRED_BY_OVERRIDABLE, UNIT_WANTED_BY, UNIT_BOUND_BY }; Unit *target; Iterator i; int r; unsigned k; assert(u); for (k = 0; k < ELEMENTSOF(deps); k++) SET_FOREACH(target, u->dependencies[deps[k]], i) if ((r = unit_add_default_target_dependency(u, target)) < 0) return r; return 0; } int unit_load(Unit *u) { int r; assert(u); if (u->in_load_queue) { LIST_REMOVE(Unit, load_queue, u->manager->load_queue, u); u->in_load_queue = false; } if (u->type == _UNIT_TYPE_INVALID) return -EINVAL; if (u->load_state != UNIT_STUB) return 0; if (UNIT_VTABLE(u)->load) if ((r = UNIT_VTABLE(u)->load(u)) < 0) goto fail; if (u->load_state == UNIT_STUB) { r = -ENOENT; goto fail; } if (u->load_state == UNIT_LOADED && u->default_dependencies) if ((r = unit_add_default_dependencies(u)) < 0) goto fail; if (u->load_state == UNIT_LOADED) { r = unit_add_mount_links(u); if (r < 0) return r; } if (u->on_failure_isolate && set_size(u->dependencies[UNIT_ON_FAILURE]) > 1) { log_error("More than one OnFailure= dependencies specified for %s but OnFailureIsolate= enabled. Refusing.", u->id); r = -EINVAL; goto fail; } assert((u->load_state != UNIT_MERGED) == !u->merged_into); unit_add_to_dbus_queue(unit_follow_merge(u)); unit_add_to_gc_queue(u); return 0; fail: u->load_state = UNIT_ERROR; u->load_error = r; unit_add_to_dbus_queue(u); unit_add_to_gc_queue(u); log_debug("Failed to load configuration for %s: %s", u->id, strerror(-r)); return r; } bool unit_condition_test(Unit *u) { assert(u); dual_timestamp_get(&u->condition_timestamp); u->condition_result = condition_test_list(u->conditions); return u->condition_result; } static const char* unit_get_status_message_format(Unit *u, JobType t) { const UnitStatusMessageFormats *format_table; assert(u); assert(t >= 0); assert(t < _JOB_TYPE_MAX); if (t != JOB_START && t != JOB_STOP) return NULL; format_table = &UNIT_VTABLE(u)->status_message_formats; if (!format_table) return NULL; return format_table->starting_stopping[t == JOB_STOP]; } static const char *unit_get_status_message_format_try_harder(Unit *u, JobType t) { const char *format; assert(u); assert(t >= 0); assert(t < _JOB_TYPE_MAX); format = unit_get_status_message_format(u, t); if (format) return format; /* Return generic strings */ if (t == JOB_START) return "Starting %s."; else if (t == JOB_STOP) return "Stopping %s."; else if (t == JOB_RELOAD) return "Reloading %s."; return NULL; } static void unit_status_print_starting_stopping(Unit *u, JobType t) { const char *format; assert(u); /* We only print status messages for selected units on * selected operations. */ format = unit_get_status_message_format(u, t); if (!format) return; unit_status_printf(u, "", format); } #pragma GCC diagnostic push #pragma GCC diagnostic ignored "-Wformat-nonliteral" static void unit_status_log_starting_stopping_reloading(Unit *u, JobType t) { const char *format; char buf[LINE_MAX]; sd_id128_t mid; assert(u); if (t != JOB_START && t != JOB_STOP && t != JOB_RELOAD) return; if (log_on_console()) return; /* We log status messages for all units and all operations. */ format = unit_get_status_message_format_try_harder(u, t); if (!format) return; snprintf(buf, sizeof(buf), format, unit_description(u)); char_array_0(buf); mid = t == JOB_START ? SD_MESSAGE_UNIT_STARTING : t == JOB_STOP ? SD_MESSAGE_UNIT_STOPPING : SD_MESSAGE_UNIT_RELOADING; log_struct_unit(LOG_INFO, u->id, MESSAGE_ID(mid), "MESSAGE=%s", buf, NULL); } #pragma GCC diagnostic pop /* Errors: * -EBADR: This unit type does not support starting. * -EALREADY: Unit is already started. * -EAGAIN: An operation is already in progress. Retry later. * -ECANCELED: Too many requests for now. */ int unit_start(Unit *u) { UnitActiveState state; Unit *following; assert(u); if (u->load_state != UNIT_LOADED) return -EINVAL; /* If this is already started, then this will succeed. Note * that this will even succeed if this unit is not startable * by the user. This is relied on to detect when we need to * wait for units and when waiting is finished. */ state = unit_active_state(u); if (UNIT_IS_ACTIVE_OR_RELOADING(state)) return -EALREADY; /* If the conditions failed, don't do anything at all. If we * already are activating this call might still be useful to * speed up activation in case there is some hold-off time, * but we don't want to recheck the condition in that case. */ if (state != UNIT_ACTIVATING && !unit_condition_test(u)) { log_debug("Starting of %s requested but condition failed. Ignoring.", u->id); return -EALREADY; } /* Forward to the main object, if we aren't it. */ if ((following = unit_following(u))) { log_debug("Redirecting start request from %s to %s.", u->id, following->id); return unit_start(following); } unit_status_log_starting_stopping_reloading(u, JOB_START); unit_status_print_starting_stopping(u, JOB_START); /* If it is stopped, but we cannot start it, then fail */ if (!UNIT_VTABLE(u)->start) return -EBADR; /* We don't suppress calls to ->start() here when we are * already starting, to allow this request to be used as a * "hurry up" call, for example when the unit is in some "auto * restart" state where it waits for a holdoff timer to elapse * before it will start again. */ unit_add_to_dbus_queue(u); return UNIT_VTABLE(u)->start(u); } bool unit_can_start(Unit *u) { assert(u); return !!UNIT_VTABLE(u)->start; } bool unit_can_isolate(Unit *u) { assert(u); return unit_can_start(u) && u->allow_isolate; } /* Errors: * -EBADR: This unit type does not support stopping. * -EALREADY: Unit is already stopped. * -EAGAIN: An operation is already in progress. Retry later. */ int unit_stop(Unit *u) { UnitActiveState state; Unit *following; assert(u); state = unit_active_state(u); if (UNIT_IS_INACTIVE_OR_FAILED(state)) return -EALREADY; if ((following = unit_following(u))) { log_debug("Redirecting stop request from %s to %s.", u->id, following->id); return unit_stop(following); } unit_status_log_starting_stopping_reloading(u, JOB_STOP); unit_status_print_starting_stopping(u, JOB_STOP); if (!UNIT_VTABLE(u)->stop) return -EBADR; unit_add_to_dbus_queue(u); return UNIT_VTABLE(u)->stop(u); } /* Errors: * -EBADR: This unit type does not support reloading. * -ENOEXEC: Unit is not started. * -EAGAIN: An operation is already in progress. Retry later. */ int unit_reload(Unit *u) { UnitActiveState state; Unit *following; assert(u); if (u->load_state != UNIT_LOADED) return -EINVAL; if (!unit_can_reload(u)) return -EBADR; state = unit_active_state(u); if (state == UNIT_RELOADING) return -EALREADY; if (state != UNIT_ACTIVE) return -ENOEXEC; if ((following = unit_following(u))) { log_debug("Redirecting reload request from %s to %s.", u->id, following->id); return unit_reload(following); } unit_status_log_starting_stopping_reloading(u, JOB_RELOAD); unit_add_to_dbus_queue(u); return UNIT_VTABLE(u)->reload(u); } bool unit_can_reload(Unit *u) { assert(u); if (!UNIT_VTABLE(u)->reload) return false; if (!UNIT_VTABLE(u)->can_reload) return true; return UNIT_VTABLE(u)->can_reload(u); } static void unit_check_unneeded(Unit *u) { Iterator i; Unit *other; assert(u); /* If this service shall be shut down when unneeded then do * so. */ if (!u->stop_when_unneeded) return; if (!UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(u))) return; SET_FOREACH(other, u->dependencies[UNIT_REQUIRED_BY], i) if (unit_pending_active(other)) return; SET_FOREACH(other, u->dependencies[UNIT_REQUIRED_BY_OVERRIDABLE], i) if (unit_pending_active(other)) return; SET_FOREACH(other, u->dependencies[UNIT_WANTED_BY], i) if (unit_pending_active(other)) return; SET_FOREACH(other, u->dependencies[UNIT_BOUND_BY], i) if (unit_pending_active(other)) return; log_info("Service %s is not needed anymore. Stopping.", u->id); /* Ok, nobody needs us anymore. Sniff. Then let's commit suicide */ manager_add_job(u->manager, JOB_STOP, u, JOB_FAIL, true, NULL, NULL); } static void retroactively_start_dependencies(Unit *u) { Iterator i; Unit *other; assert(u); assert(UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(u))); SET_FOREACH(other, u->dependencies[UNIT_REQUIRES], i) if (!set_get(u->dependencies[UNIT_AFTER], other) && !UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other))) manager_add_job(u->manager, JOB_START, other, JOB_REPLACE, true, NULL, NULL); SET_FOREACH(other, u->dependencies[UNIT_BINDS_TO], i) if (!set_get(u->dependencies[UNIT_AFTER], other) && !UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other))) manager_add_job(u->manager, JOB_START, other, JOB_REPLACE, true, NULL, NULL); SET_FOREACH(other, u->dependencies[UNIT_REQUIRES_OVERRIDABLE], i) if (!set_get(u->dependencies[UNIT_AFTER], other) && !UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other))) manager_add_job(u->manager, JOB_START, other, JOB_FAIL, false, NULL, NULL); SET_FOREACH(other, u->dependencies[UNIT_REQUISITE], i) if (!set_get(u->dependencies[UNIT_AFTER], other) && !UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other))) manager_add_job(u->manager, JOB_START, other, JOB_REPLACE, true, NULL, NULL); SET_FOREACH(other, u->dependencies[UNIT_WANTS], i) if (!set_get(u->dependencies[UNIT_AFTER], other) && !UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other))) manager_add_job(u->manager, JOB_START, other, JOB_FAIL, false, NULL, NULL); SET_FOREACH(other, u->dependencies[UNIT_CONFLICTS], i) if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other))) manager_add_job(u->manager, JOB_STOP, other, JOB_REPLACE, true, NULL, NULL); SET_FOREACH(other, u->dependencies[UNIT_CONFLICTED_BY], i) if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other))) manager_add_job(u->manager, JOB_STOP, other, JOB_REPLACE, true, NULL, NULL); } static void retroactively_stop_dependencies(Unit *u) { Iterator i; Unit *other; assert(u); assert(UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(u))); /* Pull down units which are bound to us recursively if enabled */ SET_FOREACH(other, u->dependencies[UNIT_BOUND_BY], i) if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other))) manager_add_job(u->manager, JOB_STOP, other, JOB_REPLACE, true, NULL, NULL); } static void check_unneeded_dependencies(Unit *u) { Iterator i; Unit *other; assert(u); assert(UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(u))); /* Garbage collect services that might not be needed anymore, if enabled */ SET_FOREACH(other, u->dependencies[UNIT_REQUIRES], i) if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other))) unit_check_unneeded(other); SET_FOREACH(other, u->dependencies[UNIT_REQUIRES_OVERRIDABLE], i) if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other))) unit_check_unneeded(other); SET_FOREACH(other, u->dependencies[UNIT_WANTS], i) if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other))) unit_check_unneeded(other); SET_FOREACH(other, u->dependencies[UNIT_REQUISITE], i) if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other))) unit_check_unneeded(other); SET_FOREACH(other, u->dependencies[UNIT_REQUISITE_OVERRIDABLE], i) if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other))) unit_check_unneeded(other); SET_FOREACH(other, u->dependencies[UNIT_BINDS_TO], i) if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other))) unit_check_unneeded(other); } void unit_trigger_on_failure(Unit *u) { Unit *other; Iterator i; assert(u); if (set_size(u->dependencies[UNIT_ON_FAILURE]) <= 0) return; log_info("Triggering OnFailure= dependencies of %s.", u->id); SET_FOREACH(other, u->dependencies[UNIT_ON_FAILURE], i) { int r; if ((r = manager_add_job(u->manager, JOB_START, other, u->on_failure_isolate ? JOB_ISOLATE : JOB_REPLACE, true, NULL, NULL)) < 0) log_error("Failed to enqueue OnFailure= job: %s", strerror(-r)); } } void unit_notify(Unit *u, UnitActiveState os, UnitActiveState ns, bool reload_success) { Manager *m; bool unexpected; assert(u); assert(os < _UNIT_ACTIVE_STATE_MAX); assert(ns < _UNIT_ACTIVE_STATE_MAX); /* Note that this is called for all low-level state changes, * even if they might map to the same high-level * UnitActiveState! That means that ns == os is OK an expected * behavior here. For example: if a mount point is remounted * this function will be called too! */ m = u->manager; if (m->n_reloading <= 0) { dual_timestamp ts; dual_timestamp_get(&ts); if (UNIT_IS_INACTIVE_OR_FAILED(os) && !UNIT_IS_INACTIVE_OR_FAILED(ns)) u->inactive_exit_timestamp = ts; else if (!UNIT_IS_INACTIVE_OR_FAILED(os) && UNIT_IS_INACTIVE_OR_FAILED(ns)) u->inactive_enter_timestamp = ts; if (!UNIT_IS_ACTIVE_OR_RELOADING(os) && UNIT_IS_ACTIVE_OR_RELOADING(ns)) u->active_enter_timestamp = ts; else if (UNIT_IS_ACTIVE_OR_RELOADING(os) && !UNIT_IS_ACTIVE_OR_RELOADING(ns)) u->active_exit_timestamp = ts; timer_unit_notify(u, ns); path_unit_notify(u, ns); } if (UNIT_IS_INACTIVE_OR_FAILED(ns)) cgroup_bonding_trim_list(u->cgroup_bondings, true); if (UNIT_IS_INACTIVE_OR_FAILED(os) != UNIT_IS_INACTIVE_OR_FAILED(ns)) { ExecContext *ec = unit_get_exec_context(u); if (ec && exec_context_may_touch_console(ec)) { /* XXX The counter may get out of sync if the admin edits * TTY-related unit file properties and issues a daemon-reload * while the unit is active. No big deal though, because * it influences only the printing of boot/shutdown * status messages. */ if (UNIT_IS_INACTIVE_OR_FAILED(ns)) m->n_on_console--; else m->n_on_console++; } } if (u->job) { unexpected = false; if (u->job->state == JOB_WAITING) /* So we reached a different state for this * job. Let's see if we can run it now if it * failed previously due to EAGAIN. */ job_add_to_run_queue(u->job); /* Let's check whether this state change constitutes a * finished job, or maybe contradicts a running job and * hence needs to invalidate jobs. */ switch (u->job->type) { case JOB_START: case JOB_VERIFY_ACTIVE: if (UNIT_IS_ACTIVE_OR_RELOADING(ns)) job_finish_and_invalidate(u->job, JOB_DONE, true); else if (u->job->state == JOB_RUNNING && ns != UNIT_ACTIVATING) { unexpected = true; if (UNIT_IS_INACTIVE_OR_FAILED(ns)) job_finish_and_invalidate(u->job, ns == UNIT_FAILED ? JOB_FAILED : JOB_DONE, true); } break; case JOB_RELOAD: case JOB_RELOAD_OR_START: if (u->job->state == JOB_RUNNING) { if (ns == UNIT_ACTIVE) job_finish_and_invalidate(u->job, reload_success ? JOB_DONE : JOB_FAILED, true); else if (ns != UNIT_ACTIVATING && ns != UNIT_RELOADING) { unexpected = true; if (UNIT_IS_INACTIVE_OR_FAILED(ns)) job_finish_and_invalidate(u->job, ns == UNIT_FAILED ? JOB_FAILED : JOB_DONE, true); } } break; case JOB_STOP: case JOB_RESTART: case JOB_TRY_RESTART: if (UNIT_IS_INACTIVE_OR_FAILED(ns)) job_finish_and_invalidate(u->job, JOB_DONE, true); else if (u->job->state == JOB_RUNNING && ns != UNIT_DEACTIVATING) { unexpected = true; job_finish_and_invalidate(u->job, JOB_FAILED, true); } break; default: assert_not_reached("Job type unknown"); } } else unexpected = true; if (m->n_reloading <= 0) { /* If this state change happened without being * requested by a job, then let's retroactively start * or stop dependencies. We skip that step when * deserializing, since we don't want to create any * additional jobs just because something is already * activated. */ if (unexpected) { if (UNIT_IS_INACTIVE_OR_FAILED(os) && UNIT_IS_ACTIVE_OR_ACTIVATING(ns)) retroactively_start_dependencies(u); else if (UNIT_IS_ACTIVE_OR_ACTIVATING(os) && UNIT_IS_INACTIVE_OR_DEACTIVATING(ns)) retroactively_stop_dependencies(u); } /* stop unneeded units regardless if going down was expected or not */ if (UNIT_IS_ACTIVE_OR_ACTIVATING(os) && UNIT_IS_INACTIVE_OR_DEACTIVATING(ns)) check_unneeded_dependencies(u); if (ns != os && ns == UNIT_FAILED) { log_struct_unit(LOG_NOTICE, u->id, "MESSAGE=Unit %s entered failed state", u->id, NULL); unit_trigger_on_failure(u); } } /* Some names are special */ if (UNIT_IS_ACTIVE_OR_RELOADING(ns)) { if (unit_has_name(u, SPECIAL_DBUS_SERVICE)) /* The bus just might have become available, * hence try to connect to it, if we aren't * yet connected. */ bus_init(m, true); if (u->type == UNIT_SERVICE && !UNIT_IS_ACTIVE_OR_RELOADING(os) && m->n_reloading <= 0) { /* Write audit record if we have just finished starting up */ manager_send_unit_audit(m, u, AUDIT_SERVICE_START, true); u->in_audit = true; } if (!UNIT_IS_ACTIVE_OR_RELOADING(os)) manager_send_unit_plymouth(m, u); } else { /* We don't care about D-Bus here, since we'll get an * asynchronous notification for it anyway. */ if (u->type == UNIT_SERVICE && UNIT_IS_INACTIVE_OR_FAILED(ns) && !UNIT_IS_INACTIVE_OR_FAILED(os) && m->n_reloading <= 0) { /* Hmm, if there was no start record written * write it now, so that we always have a nice * pair */ if (!u->in_audit) { manager_send_unit_audit(m, u, AUDIT_SERVICE_START, ns == UNIT_INACTIVE); if (ns == UNIT_INACTIVE) manager_send_unit_audit(m, u, AUDIT_SERVICE_STOP, true); } else /* Write audit record if we have just finished shutting down */ manager_send_unit_audit(m, u, AUDIT_SERVICE_STOP, ns == UNIT_INACTIVE); u->in_audit = false; } } manager_recheck_journal(m); /* Maybe we finished startup and are now ready for being * stopped because unneeded? */ if (u->manager->n_reloading <= 0) unit_check_unneeded(u); unit_add_to_dbus_queue(u); unit_add_to_gc_queue(u); } int unit_watch_fd(Unit *u, int fd, uint32_t events, Watch *w) { struct epoll_event ev; assert(u); assert(fd >= 0); assert(w); assert(w->type == WATCH_INVALID || (w->type == WATCH_FD && w->fd == fd && w->data.unit == u)); zero(ev); ev.data.ptr = w; ev.events = events; if (epoll_ctl(u->manager->epoll_fd, w->type == WATCH_INVALID ? EPOLL_CTL_ADD : EPOLL_CTL_MOD, fd, &ev) < 0) return -errno; w->fd = fd; w->type = WATCH_FD; w->data.unit = u; return 0; } void unit_unwatch_fd(Unit *u, Watch *w) { assert(u); assert(w); if (w->type == WATCH_INVALID) return; assert(w->type == WATCH_FD); assert(w->data.unit == u); assert_se(epoll_ctl(u->manager->epoll_fd, EPOLL_CTL_DEL, w->fd, NULL) >= 0); w->fd = -1; w->type = WATCH_INVALID; w->data.unit = NULL; } int unit_watch_pid(Unit *u, pid_t pid) { assert(u); assert(pid >= 1); /* Watch a specific PID. We only support one unit watching * each PID for now. */ return hashmap_put(u->manager->watch_pids, LONG_TO_PTR(pid), u); } void unit_unwatch_pid(Unit *u, pid_t pid) { assert(u); assert(pid >= 1); hashmap_remove_value(u->manager->watch_pids, LONG_TO_PTR(pid), u); } int unit_watch_timer(Unit *u, clockid_t clock_id, bool relative, usec_t usec, Watch *w) { struct itimerspec its; int flags, fd; bool ours; assert(u); assert(w); assert(w->type == WATCH_INVALID || (w->type == WATCH_UNIT_TIMER && w->data.unit == u)); /* This will try to reuse the old timer if there is one */ if (w->type == WATCH_UNIT_TIMER) { assert(w->data.unit == u); assert(w->fd >= 0); ours = false; fd = w->fd; } else if (w->type == WATCH_INVALID) { ours = true; fd = timerfd_create(clock_id, TFD_NONBLOCK|TFD_CLOEXEC); if (fd < 0) return -errno; } else assert_not_reached("Invalid watch type"); zero(its); if (usec <= 0) { /* Set absolute time in the past, but not 0, since we * don't want to disarm the timer */ its.it_value.tv_sec = 0; its.it_value.tv_nsec = 1; flags = TFD_TIMER_ABSTIME; } else { timespec_store(&its.it_value, usec); flags = relative ? 0 : TFD_TIMER_ABSTIME; } /* This will also flush the elapse counter */ if (timerfd_settime(fd, flags, &its, NULL) < 0) goto fail; if (w->type == WATCH_INVALID) { struct epoll_event ev; zero(ev); ev.data.ptr = w; ev.events = EPOLLIN; if (epoll_ctl(u->manager->epoll_fd, EPOLL_CTL_ADD, fd, &ev) < 0) goto fail; } w->type = WATCH_UNIT_TIMER; w->fd = fd; w->data.unit = u; return 0; fail: if (ours) close_nointr_nofail(fd); return -errno; } void unit_unwatch_timer(Unit *u, Watch *w) { assert(u); assert(w); if (w->type == WATCH_INVALID) return; assert(w->type == WATCH_UNIT_TIMER); assert(w->data.unit == u); assert(w->fd >= 0); assert_se(epoll_ctl(u->manager->epoll_fd, EPOLL_CTL_DEL, w->fd, NULL) >= 0); close_nointr_nofail(w->fd); w->fd = -1; w->type = WATCH_INVALID; w->data.unit = NULL; } bool unit_job_is_applicable(Unit *u, JobType j) { assert(u); assert(j >= 0 && j < _JOB_TYPE_MAX); switch (j) { case JOB_VERIFY_ACTIVE: case JOB_START: case JOB_STOP: case JOB_NOP: return true; case JOB_RESTART: case JOB_TRY_RESTART: return unit_can_start(u); case JOB_RELOAD: return unit_can_reload(u); case JOB_RELOAD_OR_START: return unit_can_reload(u) && unit_can_start(u); default: assert_not_reached("Invalid job type"); } } int unit_add_dependency(Unit *u, UnitDependency d, Unit *other, bool add_reference) { static const UnitDependency inverse_table[_UNIT_DEPENDENCY_MAX] = { [UNIT_REQUIRES] = UNIT_REQUIRED_BY, [UNIT_REQUIRES_OVERRIDABLE] = UNIT_REQUIRED_BY_OVERRIDABLE, [UNIT_WANTS] = UNIT_WANTED_BY, [UNIT_REQUISITE] = UNIT_REQUIRED_BY, [UNIT_REQUISITE_OVERRIDABLE] = UNIT_REQUIRED_BY_OVERRIDABLE, [UNIT_BINDS_TO] = UNIT_BOUND_BY, [UNIT_PART_OF] = UNIT_CONSISTS_OF, [UNIT_REQUIRED_BY] = _UNIT_DEPENDENCY_INVALID, [UNIT_REQUIRED_BY_OVERRIDABLE] = _UNIT_DEPENDENCY_INVALID, [UNIT_WANTED_BY] = _UNIT_DEPENDENCY_INVALID, [UNIT_BOUND_BY] = UNIT_BINDS_TO, [UNIT_CONSISTS_OF] = UNIT_PART_OF, [UNIT_CONFLICTS] = UNIT_CONFLICTED_BY, [UNIT_CONFLICTED_BY] = UNIT_CONFLICTS, [UNIT_BEFORE] = UNIT_AFTER, [UNIT_AFTER] = UNIT_BEFORE, [UNIT_ON_FAILURE] = _UNIT_DEPENDENCY_INVALID, [UNIT_REFERENCES] = UNIT_REFERENCED_BY, [UNIT_REFERENCED_BY] = UNIT_REFERENCES, [UNIT_TRIGGERS] = UNIT_TRIGGERED_BY, [UNIT_TRIGGERED_BY] = UNIT_TRIGGERS, [UNIT_PROPAGATES_RELOAD_TO] = UNIT_RELOAD_PROPAGATED_FROM, [UNIT_RELOAD_PROPAGATED_FROM] = UNIT_PROPAGATES_RELOAD_TO, }; int r, q = 0, v = 0, w = 0; assert(u); assert(d >= 0 && d < _UNIT_DEPENDENCY_MAX); assert(other); u = unit_follow_merge(u); other = unit_follow_merge(other); /* We won't allow dependencies on ourselves. We will not * consider them an error however. */ if (u == other) return 0; if ((r = set_ensure_allocated(&u->dependencies[d], trivial_hash_func, trivial_compare_func)) < 0) return r; if (inverse_table[d] != _UNIT_DEPENDENCY_INVALID) if ((r = set_ensure_allocated(&other->dependencies[inverse_table[d]], trivial_hash_func, trivial_compare_func)) < 0) return r; if (add_reference) if ((r = set_ensure_allocated(&u->dependencies[UNIT_REFERENCES], trivial_hash_func, trivial_compare_func)) < 0 || (r = set_ensure_allocated(&other->dependencies[UNIT_REFERENCED_BY], trivial_hash_func, trivial_compare_func)) < 0) return r; if ((q = set_put(u->dependencies[d], other)) < 0) return q; if (inverse_table[d] != _UNIT_DEPENDENCY_INVALID) if ((v = set_put(other->dependencies[inverse_table[d]], u)) < 0) { r = v; goto fail; } if (add_reference) { if ((w = set_put(u->dependencies[UNIT_REFERENCES], other)) < 0) { r = w; goto fail; } if ((r = set_put(other->dependencies[UNIT_REFERENCED_BY], u)) < 0) goto fail; } unit_add_to_dbus_queue(u); return 0; fail: if (q > 0) set_remove(u->dependencies[d], other); if (v > 0) set_remove(other->dependencies[inverse_table[d]], u); if (w > 0) set_remove(u->dependencies[UNIT_REFERENCES], other); return r; } int unit_add_two_dependencies(Unit *u, UnitDependency d, UnitDependency e, Unit *other, bool add_reference) { int r; assert(u); if ((r = unit_add_dependency(u, d, other, add_reference)) < 0) return r; if ((r = unit_add_dependency(u, e, other, add_reference)) < 0) return r; return 0; } static const char *resolve_template(Unit *u, const char *name, const char*path, char **p) { char *s; assert(u); assert(name || path); assert(p); if (!name) name = path_get_file_name(path); if (!unit_name_is_template(name)) { *p = NULL; return name; } if (u->instance) s = unit_name_replace_instance(name, u->instance); else { char *i; i = unit_name_to_prefix(u->id); if (!i) return NULL; s = unit_name_replace_instance(name, i); free(i); } if (!s) return NULL; *p = s; return s; } int unit_add_dependency_by_name(Unit *u, UnitDependency d, const char *name, const char *path, bool add_reference) { Unit *other; int r; _cleanup_free_ char *s = NULL; assert(u); assert(name || path); name = resolve_template(u, name, path, &s); if (!name) return -ENOMEM; r = manager_load_unit(u->manager, name, path, NULL, &other); if (r < 0) return r; return unit_add_dependency(u, d, other, add_reference); } int unit_add_two_dependencies_by_name(Unit *u, UnitDependency d, UnitDependency e, const char *name, const char *path, bool add_reference) { Unit *other; int r; char *s; assert(u); assert(name || path); if (!(name = resolve_template(u, name, path, &s))) return -ENOMEM; if ((r = manager_load_unit(u->manager, name, path, NULL, &other)) < 0) goto finish; r = unit_add_two_dependencies(u, d, e, other, add_reference); finish: free(s); return r; } int unit_add_dependency_by_name_inverse(Unit *u, UnitDependency d, const char *name, const char *path, bool add_reference) { Unit *other; int r; char *s; assert(u); assert(name || path); if (!(name = resolve_template(u, name, path, &s))) return -ENOMEM; if ((r = manager_load_unit(u->manager, name, path, NULL, &other)) < 0) goto finish; r = unit_add_dependency(other, d, u, add_reference); finish: free(s); return r; } int unit_add_two_dependencies_by_name_inverse(Unit *u, UnitDependency d, UnitDependency e, const char *name, const char *path, bool add_reference) { Unit *other; int r; char *s; assert(u); assert(name || path); if (!(name = resolve_template(u, name, path, &s))) return -ENOMEM; if ((r = manager_load_unit(u->manager, name, path, NULL, &other)) < 0) goto finish; if ((r = unit_add_two_dependencies(other, d, e, u, add_reference)) < 0) goto finish; finish: free(s); return r; } int set_unit_path(const char *p) { _cleanup_free_ char *c = NULL; /* This is mostly for debug purposes */ c = path_make_absolute_cwd(p); if (setenv("SYSTEMD_UNIT_PATH", c, 0) < 0) return -errno; return 0; } char *unit_dbus_path(Unit *u) { assert(u); if (!u->id) return NULL; return unit_dbus_path_from_name(u->id); } int unit_add_cgroup(Unit *u, CGroupBonding *b) { int r; assert(u); assert(b); assert(b->path); if (!b->controller) { b->controller = strdup(SYSTEMD_CGROUP_CONTROLLER); if (!b->controller) return log_oom(); b->ours = true; } /* Ensure this hasn't been added yet */ assert(!b->unit); if (streq(b->controller, SYSTEMD_CGROUP_CONTROLLER)) { CGroupBonding *l; l = hashmap_get(u->manager->cgroup_bondings, b->path); LIST_PREPEND(CGroupBonding, by_path, l, b); r = hashmap_replace(u->manager->cgroup_bondings, b->path, l); if (r < 0) { LIST_REMOVE(CGroupBonding, by_path, l, b); return r; } } LIST_PREPEND(CGroupBonding, by_unit, u->cgroup_bondings, b); b->unit = u; return 0; } char *unit_default_cgroup_path(Unit *u) { assert(u); if (u->instance) { _cleanup_free_ char *t = NULL; t = unit_name_template(u->id); if (!t) return NULL; return strjoin(u->manager->cgroup_hierarchy, "/", t, "/", u->instance, NULL); } else return strjoin(u->manager->cgroup_hierarchy, "/", u->id, NULL); } int unit_add_cgroup_from_text(Unit *u, const char *name, bool overwrite, CGroupBonding **ret) { char *controller = NULL, *path = NULL; CGroupBonding *b = NULL; bool ours = false; int r; assert(u); assert(name); r = cg_split_spec(name, &controller, &path); if (r < 0) return r; if (!path) { path = unit_default_cgroup_path(u); ours = true; } if (!controller) { controller = strdup(SYSTEMD_CGROUP_CONTROLLER); ours = true; } if (!path || !controller) { free(path); free(controller); return log_oom(); } b = cgroup_bonding_find_list(u->cgroup_bondings, controller); if (b) { if (streq(path, b->path)) { free(path); free(controller); if (ret) *ret = b; return 0; } if (overwrite && !b->essential) { free(controller); free(b->path); b->path = path; b->ours = ours; b->realized = false; if (ret) *ret = b; return 1; } r = -EEXIST; b = NULL; goto fail; } b = new0(CGroupBonding, 1); if (!b) { r = -ENOMEM; goto fail; } b->controller = controller; b->path = path; b->ours = ours; b->essential = streq(controller, SYSTEMD_CGROUP_CONTROLLER); r = unit_add_cgroup(u, b); if (r < 0) goto fail; if (ret) *ret = b; return 1; fail: free(path); free(controller); free(b); return r; } static int unit_add_one_default_cgroup(Unit *u, const char *controller) { CGroupBonding *b = NULL; int r = -ENOMEM; assert(u); if (!controller) controller = SYSTEMD_CGROUP_CONTROLLER; if (cgroup_bonding_find_list(u->cgroup_bondings, controller)) return 0; b = new0(CGroupBonding, 1); if (!b) return -ENOMEM; b->controller = strdup(controller); if (!b->controller) goto fail; b->path = unit_default_cgroup_path(u); if (!b->path) goto fail; b->ours = true; b->essential = streq(controller, SYSTEMD_CGROUP_CONTROLLER); r = unit_add_cgroup(u, b); if (r < 0) goto fail; return 1; fail: free(b->path); free(b->controller); free(b); return r; } int unit_add_default_cgroups(Unit *u) { CGroupAttribute *a; char **c; int r; assert(u); /* Adds in the default cgroups, if they weren't specified * otherwise. */ if (!u->manager->cgroup_hierarchy) return 0; r = unit_add_one_default_cgroup(u, NULL); if (r < 0) return r; STRV_FOREACH(c, u->manager->default_controllers) unit_add_one_default_cgroup(u, *c); LIST_FOREACH(by_unit, a, u->cgroup_attributes) unit_add_one_default_cgroup(u, a->controller); return 0; } CGroupBonding* unit_get_default_cgroup(Unit *u) { assert(u); return cgroup_bonding_find_list(u->cgroup_bondings, NULL); } int unit_add_cgroup_attribute( Unit *u, const CGroupSemantics *semantics, const char *controller, const char *name, const char *value, CGroupAttribute **ret) { _cleanup_free_ char *c = NULL; CGroupAttribute *a; int r; assert(u); assert(value); if (semantics) { /* Semantics always take precedence */ if (semantics->name) name = semantics->name; if (semantics->controller) controller = semantics->controller; } if (!name) return -EINVAL; if (!controller) { r = cg_controller_from_attr(name, &c); if (r < 0) return -EINVAL; controller = c; } if (!controller || streq(controller, SYSTEMD_CGROUP_CONTROLLER)) return -EINVAL; if (!filename_is_safe(name)) return -EINVAL; if (!filename_is_safe(controller)) return -EINVAL; /* Check if this attribute already exists. Note that we will * explicitly check for the value here too, as there are * attributes which accept multiple values. */ a = cgroup_attribute_find_list(u->cgroup_attributes, controller, name); if (a) { if (streq(value, a->value)) { /* Exactly the same value is always OK, let's ignore this */ if (ret) *ret = a; return 0; } if (semantics && !semantics->multiple) { char *v; /* If this is a single-item entry, we can * simply patch the existing attribute */ v = strdup(value); if (!v) return -ENOMEM; free(a->value); a->value = v; if (ret) *ret = a; return 1; } } a = new0(CGroupAttribute, 1); if (!a) return -ENOMEM; if (c) { a->controller = c; c = NULL; } else a->controller = strdup(controller); a->name = strdup(name); a->value = strdup(value); if (!a->controller || !a->name || !a->value) { free(a->controller); free(a->name); free(a->value); free(a); return -ENOMEM; } a->semantics = semantics; a->unit = u; LIST_PREPEND(CGroupAttribute, by_unit, u->cgroup_attributes, a); if (ret) *ret = a; return 1; } int unit_load_related_unit(Unit *u, const char *type, Unit **_found) { char *t; int r; assert(u); assert(type); assert(_found); if (!(t = unit_name_change_suffix(u->id, type))) return -ENOMEM; assert(!unit_has_name(u, t)); r = manager_load_unit(u->manager, t, NULL, NULL, _found); free(t); assert(r < 0 || *_found != u); return r; } int unit_get_related_unit(Unit *u, const char *type, Unit **_found) { Unit *found; char *t; assert(u); assert(type); assert(_found); if (!(t = unit_name_change_suffix(u->id, type))) return -ENOMEM; assert(!unit_has_name(u, t)); found = manager_get_unit(u->manager, t); free(t); if (!found) return -ENOENT; *_found = found; return 0; } int unit_watch_bus_name(Unit *u, const char *name) { assert(u); assert(name); /* Watch a specific name on the bus. We only support one unit * watching each name for now. */ return hashmap_put(u->manager->watch_bus, name, u); } void unit_unwatch_bus_name(Unit *u, const char *name) { assert(u); assert(name); hashmap_remove_value(u->manager->watch_bus, name, u); } bool unit_can_serialize(Unit *u) { assert(u); return UNIT_VTABLE(u)->serialize && UNIT_VTABLE(u)->deserialize_item; } int unit_serialize(Unit *u, FILE *f, FDSet *fds, bool serialize_jobs) { int r; assert(u); assert(f); assert(fds); if (!unit_can_serialize(u)) return 0; if ((r = UNIT_VTABLE(u)->serialize(u, f, fds)) < 0) return r; if (serialize_jobs) { if (u->job) { fprintf(f, "job\n"); job_serialize(u->job, f, fds); } if (u->nop_job) { fprintf(f, "job\n"); job_serialize(u->nop_job, f, fds); } } dual_timestamp_serialize(f, "inactive-exit-timestamp", &u->inactive_exit_timestamp); dual_timestamp_serialize(f, "active-enter-timestamp", &u->active_enter_timestamp); dual_timestamp_serialize(f, "active-exit-timestamp", &u->active_exit_timestamp); dual_timestamp_serialize(f, "inactive-enter-timestamp", &u->inactive_enter_timestamp); dual_timestamp_serialize(f, "condition-timestamp", &u->condition_timestamp); if (dual_timestamp_is_set(&u->condition_timestamp)) unit_serialize_item(u, f, "condition-result", yes_no(u->condition_result)); /* End marker */ fputc('\n', f); return 0; } void unit_serialize_item_format(Unit *u, FILE *f, const char *key, const char *format, ...) { va_list ap; assert(u); assert(f); assert(key); assert(format); fputs(key, f); fputc('=', f); va_start(ap, format); vfprintf(f, format, ap); va_end(ap); fputc('\n', f); } void unit_serialize_item(Unit *u, FILE *f, const char *key, const char *value) { assert(u); assert(f); assert(key); assert(value); fprintf(f, "%s=%s\n", key, value); } int unit_deserialize(Unit *u, FILE *f, FDSet *fds) { int r; assert(u); assert(f); assert(fds); if (!unit_can_serialize(u)) return 0; for (;;) { char line[LINE_MAX], *l, *v; size_t k; if (!fgets(line, sizeof(line), f)) { if (feof(f)) return 0; return -errno; } char_array_0(line); l = strstrip(line); /* End marker */ if (l[0] == 0) return 0; k = strcspn(l, "="); if (l[k] == '=') { l[k] = 0; v = l+k+1; } else v = l+k; if (streq(l, "job")) { if (v[0] == '\0') { /* new-style serialized job */ Job *j = job_new_raw(u); if (!j) return -ENOMEM; r = job_deserialize(j, f, fds); if (r < 0) { job_free(j); return r; } r = hashmap_put(u->manager->jobs, UINT32_TO_PTR(j->id), j); if (r < 0) { job_free(j); return r; } r = job_install_deserialized(j); if (r < 0) { hashmap_remove(u->manager->jobs, UINT32_TO_PTR(j->id)); job_free(j); return r; } } else { /* legacy */ JobType type = job_type_from_string(v); if (type < 0) log_debug("Failed to parse job type value %s", v); else u->deserialized_job = type; } continue; } else if (streq(l, "inactive-exit-timestamp")) { dual_timestamp_deserialize(v, &u->inactive_exit_timestamp); continue; } else if (streq(l, "active-enter-timestamp")) { dual_timestamp_deserialize(v, &u->active_enter_timestamp); continue; } else if (streq(l, "active-exit-timestamp")) { dual_timestamp_deserialize(v, &u->active_exit_timestamp); continue; } else if (streq(l, "inactive-enter-timestamp")) { dual_timestamp_deserialize(v, &u->inactive_enter_timestamp); continue; } else if (streq(l, "condition-timestamp")) { dual_timestamp_deserialize(v, &u->condition_timestamp); continue; } else if (streq(l, "condition-result")) { int b; if ((b = parse_boolean(v)) < 0) log_debug("Failed to parse condition result value %s", v); else u->condition_result = b; continue; } if ((r = UNIT_VTABLE(u)->deserialize_item(u, l, v, fds)) < 0) return r; } } int unit_add_node_link(Unit *u, const char *what, bool wants) { Unit *device; char *e; int r; assert(u); if (!what) return 0; /* Adds in links to the device node that this unit is based on */ if (!is_device_path(what)) return 0; e = unit_name_from_path(what, ".device"); if (!e) return -ENOMEM; r = manager_load_unit(u->manager, e, NULL, NULL, &device); free(e); if (r < 0) return r; r = unit_add_two_dependencies(u, UNIT_AFTER, UNIT_BINDS_TO, device, true); if (r < 0) return r; if (wants) { r = unit_add_dependency(device, UNIT_WANTS, u, false); if (r < 0) return r; } return 0; } int unit_coldplug(Unit *u) { int r; assert(u); if (UNIT_VTABLE(u)->coldplug) if ((r = UNIT_VTABLE(u)->coldplug(u)) < 0) return r; if (u->job) { r = job_coldplug(u->job); if (r < 0) return r; } else if (u->deserialized_job >= 0) { /* legacy */ r = manager_add_job(u->manager, u->deserialized_job, u, JOB_IGNORE_REQUIREMENTS, false, NULL, NULL); if (r < 0) return r; u->deserialized_job = _JOB_TYPE_INVALID; } return 0; } void unit_status_printf(Unit *u, const char *status, const char *unit_status_msg_format) { manager_status_printf(u->manager, false, status, unit_status_msg_format, unit_description(u)); } bool unit_need_daemon_reload(Unit *u) { struct stat st; assert(u); if (u->fragment_path) { zero(st); if (stat(u->fragment_path, &st) < 0) /* What, cannot access this anymore? */ return true; if (u->fragment_mtime > 0 && timespec_load(&st.st_mtim) != u->fragment_mtime) return true; } if (u->source_path) { zero(st); if (stat(u->source_path, &st) < 0) return true; if (u->source_mtime > 0 && timespec_load(&st.st_mtim) != u->source_mtime) return true; } return false; } void unit_reset_failed(Unit *u) { assert(u); if (UNIT_VTABLE(u)->reset_failed) UNIT_VTABLE(u)->reset_failed(u); } Unit *unit_following(Unit *u) { assert(u); if (UNIT_VTABLE(u)->following) return UNIT_VTABLE(u)->following(u); return NULL; } bool unit_pending_inactive(Unit *u) { assert(u); /* Returns true if the unit is inactive or going down */ if (UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(u))) return true; if (u->job && u->job->type == JOB_STOP) return true; return false; } bool unit_pending_active(Unit *u) { assert(u); /* Returns true if the unit is active or going up */ if (UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(u))) return true; if (u->job && (u->job->type == JOB_START || u->job->type == JOB_RELOAD_OR_START || u->job->type == JOB_RESTART)) return true; return false; } int unit_kill(Unit *u, KillWho w, int signo, DBusError *error) { assert(u); assert(w >= 0 && w < _KILL_WHO_MAX); assert(signo > 0); assert(signo < _NSIG); if (!UNIT_VTABLE(u)->kill) return -ENOTSUP; return UNIT_VTABLE(u)->kill(u, w, signo, error); } int unit_following_set(Unit *u, Set **s) { assert(u); assert(s); if (UNIT_VTABLE(u)->following_set) return UNIT_VTABLE(u)->following_set(u, s); *s = NULL; return 0; } UnitFileState unit_get_unit_file_state(Unit *u) { assert(u); if (u->unit_file_state < 0 && u->fragment_path) u->unit_file_state = unit_file_get_state( u->manager->running_as == SYSTEMD_SYSTEM ? UNIT_FILE_SYSTEM : UNIT_FILE_USER, NULL, path_get_file_name(u->fragment_path)); return u->unit_file_state; } Unit* unit_ref_set(UnitRef *ref, Unit *u) { assert(ref); assert(u); if (ref->unit) unit_ref_unset(ref); ref->unit = u; LIST_PREPEND(UnitRef, refs, u->refs, ref); return u; } void unit_ref_unset(UnitRef *ref) { assert(ref); if (!ref->unit) return; LIST_REMOVE(UnitRef, refs, ref->unit->refs, ref); ref->unit = NULL; } int unit_add_one_mount_link(Unit *u, Mount *m) { char **i; assert(u); assert(m); if (u->load_state != UNIT_LOADED || UNIT(m)->load_state != UNIT_LOADED) return 0; STRV_FOREACH(i, u->requires_mounts_for) { if (UNIT(m) == u) continue; if (!path_startswith(*i, m->where)) continue; return unit_add_two_dependencies(u, UNIT_AFTER, UNIT_REQUIRES, UNIT(m), true); } return 0; } int unit_add_mount_links(Unit *u) { Unit *other; int r; assert(u); LIST_FOREACH(units_by_type, other, u->manager->units_by_type[UNIT_MOUNT]) { r = unit_add_one_mount_link(u, MOUNT(other)); if (r < 0) return r; } return 0; } int unit_exec_context_defaults(Unit *u, ExecContext *c) { unsigned i; int r; assert(u); assert(c); /* This only copies in the ones that need memory */ for (i = 0; i < RLIMIT_NLIMITS; i++) if (u->manager->rlimit[i] && !c->rlimit[i]) { c->rlimit[i] = newdup(struct rlimit, u->manager->rlimit[i], 1); if (!c->rlimit[i]) return -ENOMEM; } if (u->manager->running_as == SYSTEMD_USER && !c->working_directory) { r = get_home_dir(&c->working_directory); if (r < 0) return r; } return 0; } ExecContext *unit_get_exec_context(Unit *u) { size_t offset; assert(u); offset = UNIT_VTABLE(u)->exec_context_offset; if (offset <= 0) return NULL; return (ExecContext*) ((uint8_t*) u + offset); } static int drop_in_file(Unit *u, bool runtime, const char *name, char **_p, char **_q) { char *p, *q; int r; assert(u); assert(name); assert(_p); assert(_q); if (u->manager->running_as == SYSTEMD_USER && runtime) return -ENOTSUP; if (!filename_is_safe(name)) return -EINVAL; if (u->manager->running_as == SYSTEMD_USER) { _cleanup_free_ char *c = NULL; r = user_config_home(&c); if (r < 0) return r; if (r == 0) return -ENOENT; p = strjoin(c, "/", u->id, ".d", NULL); } else if (runtime) p = strjoin("/run/systemd/system/", u->id, ".d", NULL); else p = strjoin("/etc/systemd/system/", u->id, ".d", NULL); if (!p) return -ENOMEM; q = strjoin(p, "/50-", name, ".conf", NULL); if (!q) { free(p); return -ENOMEM; } *_p = p; *_q = q; return 0; } int unit_write_drop_in(Unit *u, bool runtime, const char *name, const char *data) { _cleanup_free_ char *p = NULL, *q = NULL; int r; assert(u); r = drop_in_file(u, runtime, name, &p, &q); if (r < 0) return r; mkdir_p(p, 0755); return write_one_line_file_atomic_label(q, data); } int unit_remove_drop_in(Unit *u, bool runtime, const char *name) { _cleanup_free_ char *p = NULL, *q = NULL; int r; assert(u); r = drop_in_file(u, runtime, name, &p, &q); if (unlink(q) < 0) r = -errno; else r = 0; rmdir(p); return r; } int unit_kill_context( Unit *u, KillContext *c, bool sigkill, pid_t main_pid, pid_t control_pid, bool main_pid_alien) { int sig, wait_for_exit = 0, r; assert(u); assert(c); if (c->kill_mode == KILL_NONE) return 0; sig = sigkill ? SIGKILL : c->kill_signal; if (main_pid > 0) { r = kill_and_sigcont(main_pid, sig); if (r < 0 && r != -ESRCH) { _cleanup_free_ char *comm = NULL; get_process_comm(main_pid, &comm); log_warning_unit(u->id, "Failed to kill main process %li (%s): %s", (long) main_pid, strna(comm), strerror(-r)); } else wait_for_exit = !main_pid_alien; } if (control_pid > 0) { r = kill_and_sigcont(control_pid, sig); if (r < 0 && r != -ESRCH) { _cleanup_free_ char *comm = NULL; get_process_comm(control_pid, &comm); log_warning_unit(u->id, "Failed to kill control process %li (%s): %s", (long) control_pid, strna(comm), strerror(-r)); } else wait_for_exit = true; } if (c->kill_mode == KILL_CONTROL_GROUP) { _cleanup_set_free_ Set *pid_set = NULL; pid_set = set_new(trivial_hash_func, trivial_compare_func); if (!pid_set) return -ENOMEM; /* Exclude the main/control pids from being killed via the cgroup */ if (main_pid > 0) { r = set_put(pid_set, LONG_TO_PTR(main_pid)); if (r < 0) return r; } if (control_pid > 0) { r = set_put(pid_set, LONG_TO_PTR(control_pid)); if (r < 0) return r; } r = cgroup_bonding_kill_list(u->cgroup_bondings, sig, true, false, pid_set, NULL); if (r < 0) { if (r != -EAGAIN && r != -ESRCH && r != -ENOENT) log_warning_unit(u->id, "Failed to kill control group: %s", strerror(-r)); } else if (r > 0) wait_for_exit = true; } return wait_for_exit; } static const char* const unit_active_state_table[_UNIT_ACTIVE_STATE_MAX] = { [UNIT_ACTIVE] = "active", [UNIT_RELOADING] = "reloading", [UNIT_INACTIVE] = "inactive", [UNIT_FAILED] = "failed", [UNIT_ACTIVATING] = "activating", [UNIT_DEACTIVATING] = "deactivating" }; DEFINE_STRING_TABLE_LOOKUP(unit_active_state, UnitActiveState); static const char* const unit_dependency_table[_UNIT_DEPENDENCY_MAX] = { [UNIT_REQUIRES] = "Requires", [UNIT_REQUIRES_OVERRIDABLE] = "RequiresOverridable", [UNIT_REQUISITE] = "Requisite", [UNIT_REQUISITE_OVERRIDABLE] = "RequisiteOverridable", [UNIT_WANTS] = "Wants", [UNIT_BINDS_TO] = "BindsTo", [UNIT_PART_OF] = "PartOf", [UNIT_REQUIRED_BY] = "RequiredBy", [UNIT_REQUIRED_BY_OVERRIDABLE] = "RequiredByOverridable", [UNIT_WANTED_BY] = "WantedBy", [UNIT_BOUND_BY] = "BoundBy", [UNIT_CONSISTS_OF] = "ConsistsOf", [UNIT_CONFLICTS] = "Conflicts", [UNIT_CONFLICTED_BY] = "ConflictedBy", [UNIT_BEFORE] = "Before", [UNIT_AFTER] = "After", [UNIT_ON_FAILURE] = "OnFailure", [UNIT_TRIGGERS] = "Triggers", [UNIT_TRIGGERED_BY] = "TriggeredBy", [UNIT_PROPAGATES_RELOAD_TO] = "PropagatesReloadTo", [UNIT_RELOAD_PROPAGATED_FROM] = "ReloadPropagatedFrom", [UNIT_REFERENCES] = "References", [UNIT_REFERENCED_BY] = "ReferencedBy", }; DEFINE_STRING_TABLE_LOOKUP(unit_dependency, UnitDependency);