1 /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
6 This file is part of systemd.
8 Copyright 2010 Lennart Poettering
10 systemd is free software; you can redistribute it and/or modify it
11 under the terms of the GNU Lesser General Public License as published by
12 the Free Software Foundation; either version 2.1 of the License, or
13 (at your option) any later version.
15 systemd is distributed in the hope that it will be useful, but
16 WITHOUT ANY WARRANTY; without even the implied warranty of
17 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
18 Lesser General Public License for more details.
20 You should have received a copy of the GNU Lesser General Public License
21 along with systemd; If not, see <http://www.gnu.org/licenses/>.
28 typedef struct Unit Unit;
29 typedef struct UnitVTable UnitVTable;
30 typedef enum UnitActiveState UnitActiveState;
31 typedef enum UnitDependency UnitDependency;
32 typedef struct UnitRef UnitRef;
33 typedef struct UnitStatusMessageFormats UnitStatusMessageFormats;
38 #include "socket-util.h"
41 #include "condition.h"
43 #include "unit-name.h"
45 enum UnitActiveState {
52 _UNIT_ACTIVE_STATE_MAX,
53 _UNIT_ACTIVE_STATE_INVALID = -1
56 static inline bool UNIT_IS_ACTIVE_OR_RELOADING(UnitActiveState t) {
57 return t == UNIT_ACTIVE || t == UNIT_RELOADING;
60 static inline bool UNIT_IS_ACTIVE_OR_ACTIVATING(UnitActiveState t) {
61 return t == UNIT_ACTIVE || t == UNIT_ACTIVATING || t == UNIT_RELOADING;
64 static inline bool UNIT_IS_INACTIVE_OR_DEACTIVATING(UnitActiveState t) {
65 return t == UNIT_INACTIVE || t == UNIT_FAILED || t == UNIT_DEACTIVATING;
68 static inline bool UNIT_IS_INACTIVE_OR_FAILED(UnitActiveState t) {
69 return t == UNIT_INACTIVE || t == UNIT_FAILED;
73 /* Positive dependencies */
75 UNIT_REQUIRES_OVERRIDABLE,
77 UNIT_REQUISITE_OVERRIDABLE,
82 /* Inverse of the above */
83 UNIT_REQUIRED_BY, /* inverse of 'requires' and 'requisite' is 'required_by' */
84 UNIT_REQUIRED_BY_OVERRIDABLE, /* inverse of 'requires_overridable' and 'requisite_overridable' is 'soft_required_by' */
85 UNIT_WANTED_BY, /* inverse of 'wants' */
86 UNIT_BOUND_BY, /* inverse of 'binds_to' */
87 UNIT_CONSISTS_OF, /* inverse of 'part_of' */
89 /* Negative dependencies */
90 UNIT_CONFLICTS, /* inverse of 'conflicts' is 'conflicted_by' */
94 UNIT_BEFORE, /* inverse of 'before' is 'after' and vice versa */
100 /* Triggers (i.e. a socket triggers a service) */
104 /* Propagate reloads */
105 UNIT_PROPAGATES_RELOAD_TO,
106 UNIT_RELOAD_PROPAGATED_FROM,
108 /* Reference information for GC logic */
109 UNIT_REFERENCES, /* Inverse of 'references' is 'referenced_by' */
112 _UNIT_DEPENDENCY_MAX,
113 _UNIT_DEPENDENCY_INVALID = -1
120 /* Keeps tracks of references to a unit. This is useful so
121 * that we can merge two units if necessary and correct all
122 * references to them */
125 LIST_FIELDS(UnitRef, refs);
132 UnitLoadState load_state;
135 char *id; /* One name is special because we use it for identification. Points to an entry in the names set */
139 Set *dependencies[_UNIT_DEPENDENCY_MAX];
141 char **requires_mounts_for;
144 char **documentation;
146 char *fragment_path; /* if loaded from a config file this is the primary path to it */
147 char *source_path; /* if converted, the source file */
149 usec_t fragment_mtime;
153 /* If there is something to do with this unit, then this is the installed job for it */
156 /* JOB_NOP jobs are special and can be installed without disturbing the real job. */
161 /* References to this */
162 LIST_HEAD(UnitRef, refs);
164 /* Conditions to check */
165 LIST_HEAD(Condition, conditions);
167 dual_timestamp condition_timestamp;
169 dual_timestamp inactive_exit_timestamp;
170 dual_timestamp active_enter_timestamp;
171 dual_timestamp active_exit_timestamp;
172 dual_timestamp inactive_enter_timestamp;
174 /* Counterparts in the cgroup filesystem */
176 bool cgroup_realized;
177 CGroupControllerMask cgroup_mask;
182 LIST_FIELDS(Unit, units_by_type);
184 /* All units which have requires_mounts_for set */
185 LIST_FIELDS(Unit, has_requires_mounts_for);
188 LIST_FIELDS(Unit, load_queue);
191 LIST_FIELDS(Unit, dbus_queue);
194 LIST_FIELDS(Unit, cleanup_queue);
197 LIST_FIELDS(Unit, gc_queue);
199 /* CGroup realize members queue */
200 LIST_FIELDS(Unit, cgroup_queue);
202 /* Used during GC sweeps */
205 /* When deserializing, temporarily store the job type for this
206 * unit here, if there was a job scheduled.
207 * Only for deserializing from a legacy version. New style uses full
208 * serialized jobs. */
209 int deserialized_job; /* This is actually of type JobType */
211 /* Error code when we didn't manage to load the unit (negative) */
214 /* Cached unit file state */
215 UnitFileState unit_file_state;
217 /* Garbage collect us we nobody wants or requires us anymore */
218 bool stop_when_unneeded;
220 /* Create default dependencies */
221 bool default_dependencies;
223 /* Refuse manual starting, allow starting only indirectly via dependency. */
224 bool refuse_manual_start;
226 /* Don't allow the user to stop this unit manually, allow stopping only indirectly via dependency. */
227 bool refuse_manual_stop;
229 /* Allow isolation requests */
232 /* Isolate OnFailure unit */
233 bool on_failure_isolate;
235 /* Ignore this unit when isolating */
236 bool ignore_on_isolate;
238 /* Ignore this unit when snapshotting */
239 bool ignore_on_snapshot;
241 /* Did the last condition check succeed? */
242 bool condition_result;
244 /* Is this a transient unit? */
247 bool in_load_queue:1;
248 bool in_dbus_queue:1;
249 bool in_cleanup_queue:1;
251 bool in_cgroup_queue:1;
253 bool sent_dbus_new_signal:1;
260 struct UnitStatusMessageFormats {
261 const char *starting_stopping[2];
262 const char *finished_start_job[_JOB_RESULT_MAX];
263 const char *finished_stop_job[_JOB_RESULT_MAX];
266 typedef enum UnitSetPropertiesMode {
270 } UnitSetPropertiesMode;
278 #include "automount.h"
279 #include "snapshot.h"
285 /* How much memory does an object of this unit type need */
288 /* If greater than 0, the offset into the object where
289 * ExecContext is found, if the unit type has that */
290 size_t exec_context_offset;
292 /* If greater than 0, the offset into the object where
293 * CGroupContext is found, if the unit type has that */
294 size_t cgroup_context_offset;
296 /* The name of the configuration file section with the private settings of this unit*/
297 const char *private_section;
299 /* Config file sections this unit type understands, separated
301 const char *sections;
303 /* This should reset all type-specific variables. This should
304 * not allocate memory, and is called with zero-initialized
305 * data. It should hence only initialize variables that need
307 void (*init)(Unit *u);
309 /* This should free all type-specific variables. It should be
311 void (*done)(Unit *u);
313 /* Actually load data from disk. This may fail, and should set
314 * load_state to UNIT_LOADED, UNIT_MERGED or leave it at
315 * UNIT_STUB if no configuration could be found. */
316 int (*load)(Unit *u);
318 /* If a lot of units got created via enumerate(), this is
319 * where to actually set the state and call unit_notify(). */
320 int (*coldplug)(Unit *u);
322 void (*dump)(Unit *u, FILE *f, const char *prefix);
324 int (*start)(Unit *u);
325 int (*stop)(Unit *u);
326 int (*reload)(Unit *u);
328 int (*kill)(Unit *u, KillWho w, int signo, DBusError *error);
330 bool (*can_reload)(Unit *u);
332 /* Write all data that cannot be restored from other sources
333 * away using unit_serialize_item() */
334 int (*serialize)(Unit *u, FILE *f, FDSet *fds);
336 /* Restore one item from the serialization */
337 int (*deserialize_item)(Unit *u, const char *key, const char *data, FDSet *fds);
339 /* Try to match up fds with what we need for this unit */
340 int (*distribute_fds)(Unit *u, FDSet *fds);
342 /* Boils down the more complex internal state of this unit to
343 * a simpler one that the engine can understand */
344 UnitActiveState (*active_state)(Unit *u);
346 /* Returns the substate specific to this unit type as
347 * string. This is purely information so that we can give the
348 * user a more fine grained explanation in which actual state a
350 const char* (*sub_state_to_string)(Unit *u);
352 /* Return true when there is reason to keep this entry around
353 * even nothing references it and it isn't active in any
355 bool (*check_gc)(Unit *u);
357 /* Return true when this unit is suitable for snapshotting */
358 bool (*check_snapshot)(Unit *u);
360 void (*fd_event)(Unit *u, int fd, uint32_t events, Watch *w);
361 void (*sigchld_event)(Unit *u, pid_t pid, int code, int status);
362 void (*timer_event)(Unit *u, uint64_t n_elapsed, Watch *w);
364 /* Reset failed state if we are in failed state */
365 void (*reset_failed)(Unit *u);
367 /* Called whenever any of the cgroups this unit watches for
369 void (*notify_cgroup_empty)(Unit *u);
371 /* Called whenever a process of this unit sends us a message */
372 void (*notify_message)(Unit *u, pid_t pid, char **tags);
374 /* Called whenever a name this Unit registered for comes or
376 void (*bus_name_owner_change)(Unit *u, const char *name, const char *old_owner, const char *new_owner);
378 /* Called whenever a bus PID lookup finishes */
379 void (*bus_query_pid_done)(Unit *u, const char *name, pid_t pid);
381 /* Called for each message received on the bus */
382 DBusHandlerResult (*bus_message_handler)(Unit *u, DBusConnection *c, DBusMessage *message);
384 /* Called for each property that is being set */
385 int (*bus_set_property)(Unit *u, const char *name, DBusMessageIter *i, UnitSetPropertiesMode mode, DBusError *error);
387 /* Called after at least one property got changed to apply the necessary change */
388 int (*bus_commit_properties)(Unit *u);
390 /* Return the unit this unit is following */
391 Unit *(*following)(Unit *u);
393 /* Return the set of units that are following each other */
394 int (*following_set)(Unit *u, Set **s);
396 /* Invoked each time a unit this unit is triggering changes
397 * state or gains/loses a job */
398 void (*trigger_notify)(Unit *u, Unit *trigger);
400 /* Called whenever CLOCK_REALTIME made a jump */
401 void (*time_change)(Unit *u);
403 /* This is called for each unit type and should be used to
404 * enumerate existing devices and load them. However,
405 * everything that is loaded here should still stay in
406 * inactive state. It is the job of the coldplug() call above
407 * to put the units into the initial state. */
408 int (*enumerate)(Manager *m);
410 /* Type specific cleanups. */
411 void (*shutdown)(Manager *m);
413 /* When sending out PropertiesChanged signal, which properties
414 * shall be invalidated? This is a NUL separated list of
415 * strings, to minimize relocations a little. */
416 const char *bus_invalidating_properties;
418 /* The interface name */
419 const char *bus_interface;
421 UnitStatusMessageFormats status_message_formats;
423 /* Can units of this type have multiple names? */
426 /* Instances make no sense for this type */
429 /* Exclude from automatic gc */
432 /* True if transient units of this type are OK */
433 bool can_transient:1;
436 extern const UnitVTable * const unit_vtable[_UNIT_TYPE_MAX];
438 #define UNIT_VTABLE(u) unit_vtable[(u)->type]
440 /* For casting a unit into the various unit types */
441 #define DEFINE_CAST(UPPERCASE, MixedCase) \
442 static inline MixedCase* UPPERCASE(Unit *u) { \
443 if (_unlikely_(!u || u->type != UNIT_##UPPERCASE)) \
446 return (MixedCase*) u; \
449 /* For casting the various unit types into a unit */
450 #define UNIT(u) (&(u)->meta)
452 #define UNIT_TRIGGER(u) ((Unit*) set_first((u)->dependencies[UNIT_TRIGGERS]))
454 DEFINE_CAST(SOCKET, Socket);
455 DEFINE_CAST(TIMER, Timer);
456 DEFINE_CAST(SERVICE, Service);
457 DEFINE_CAST(TARGET, Target);
458 DEFINE_CAST(DEVICE, Device);
459 DEFINE_CAST(MOUNT, Mount);
460 DEFINE_CAST(AUTOMOUNT, Automount);
461 DEFINE_CAST(SNAPSHOT, Snapshot);
462 DEFINE_CAST(SWAP, Swap);
463 DEFINE_CAST(PATH, Path);
464 DEFINE_CAST(SLICE, Slice);
466 Unit *unit_new(Manager *m, size_t size);
467 void unit_free(Unit *u);
469 int unit_add_name(Unit *u, const char *name);
471 int unit_add_dependency(Unit *u, UnitDependency d, Unit *other, bool add_reference);
472 int unit_add_two_dependencies(Unit *u, UnitDependency d, UnitDependency e, Unit *other, bool add_reference);
474 int unit_add_dependency_by_name(Unit *u, UnitDependency d, const char *name, const char *filename, bool add_reference);
475 int unit_add_two_dependencies_by_name(Unit *u, UnitDependency d, UnitDependency e, const char *name, const char *path, bool add_reference);
477 int unit_add_dependency_by_name_inverse(Unit *u, UnitDependency d, const char *name, const char *filename, bool add_reference);
478 int unit_add_two_dependencies_by_name_inverse(Unit *u, UnitDependency d, UnitDependency e, const char *name, const char *path, bool add_reference);
480 int unit_add_exec_dependencies(Unit *u, ExecContext *c);
482 int unit_choose_id(Unit *u, const char *name);
483 int unit_set_description(Unit *u, const char *description);
485 bool unit_check_gc(Unit *u);
487 void unit_add_to_load_queue(Unit *u);
488 void unit_add_to_dbus_queue(Unit *u);
489 void unit_add_to_cleanup_queue(Unit *u);
490 void unit_add_to_gc_queue(Unit *u);
492 int unit_merge(Unit *u, Unit *other);
493 int unit_merge_by_name(Unit *u, const char *other);
495 Unit *unit_follow_merge(Unit *u) _pure_;
497 int unit_load_fragment_and_dropin(Unit *u);
498 int unit_load_fragment_and_dropin_optional(Unit *u);
499 int unit_load(Unit *unit);
501 int unit_add_default_slice(Unit *u);
503 const char *unit_description(Unit *u) _pure_;
505 bool unit_has_name(Unit *u, const char *name);
507 UnitActiveState unit_active_state(Unit *u);
509 const char* unit_sub_state_to_string(Unit *u);
511 void unit_dump(Unit *u, FILE *f, const char *prefix);
513 bool unit_can_reload(Unit *u) _pure_;
514 bool unit_can_start(Unit *u) _pure_;
515 bool unit_can_isolate(Unit *u) _pure_;
517 int unit_start(Unit *u);
518 int unit_stop(Unit *u);
519 int unit_reload(Unit *u);
521 int unit_kill(Unit *u, KillWho w, int signo, DBusError *error);
522 int unit_kill_common(Unit *u, KillWho who, int signo, pid_t main_pid, pid_t control_pid, DBusError *error);
524 void unit_notify(Unit *u, UnitActiveState os, UnitActiveState ns, bool reload_success);
526 int unit_watch_fd(Unit *u, int fd, uint32_t events, Watch *w);
527 void unit_unwatch_fd(Unit *u, Watch *w);
529 int unit_watch_pid(Unit *u, pid_t pid);
530 void unit_unwatch_pid(Unit *u, pid_t pid);
532 int unit_watch_timer(Unit *u, clockid_t, bool relative, usec_t usec, Watch *w);
533 void unit_unwatch_timer(Unit *u, Watch *w);
535 int unit_watch_bus_name(Unit *u, const char *name);
536 void unit_unwatch_bus_name(Unit *u, const char *name);
538 bool unit_job_is_applicable(Unit *u, JobType j);
540 int set_unit_path(const char *p);
542 char *unit_dbus_path(Unit *u);
544 int unit_load_related_unit(Unit *u, const char *type, Unit **_found);
545 int unit_get_related_unit(Unit *u, const char *type, Unit **_found);
547 bool unit_can_serialize(Unit *u) _pure_;
548 int unit_serialize(Unit *u, FILE *f, FDSet *fds, bool serialize_jobs);
549 void unit_serialize_item_format(Unit *u, FILE *f, const char *key, const char *value, ...) _printf_attr_(4,5);
550 void unit_serialize_item(Unit *u, FILE *f, const char *key, const char *value);
551 int unit_deserialize(Unit *u, FILE *f, FDSet *fds);
553 int unit_add_node_link(Unit *u, const char *what, bool wants);
555 int unit_coldplug(Unit *u);
557 void unit_status_printf(Unit *u, const char *status, const char *unit_status_msg_format) _printf_attr_(3, 0);
559 bool unit_need_daemon_reload(Unit *u);
561 void unit_reset_failed(Unit *u);
563 Unit *unit_following(Unit *u);
565 const char *unit_slice_name(Unit *u);
567 bool unit_stop_pending(Unit *u) _pure_;
568 bool unit_inactive_or_pending(Unit *u) _pure_;
569 bool unit_active_or_pending(Unit *u);
571 int unit_add_default_target_dependency(Unit *u, Unit *target);
573 char *unit_default_cgroup_path(Unit *u);
575 int unit_following_set(Unit *u, Set **s);
577 void unit_start_on_failure(Unit *u);
578 void unit_trigger_notify(Unit *u);
580 bool unit_condition_test(Unit *u);
582 UnitFileState unit_get_unit_file_state(Unit *u);
584 Unit* unit_ref_set(UnitRef *ref, Unit *u);
585 void unit_ref_unset(UnitRef *ref);
587 #define UNIT_DEREF(ref) ((ref).unit)
588 #define UNIT_ISSET(ref) (!!(ref).unit)
590 int unit_add_one_mount_link(Unit *u, Mount *m);
591 int unit_add_mount_links(Unit *u);
593 int unit_exec_context_defaults(Unit *u, ExecContext *c);
595 ExecContext *unit_get_exec_context(Unit *u) _pure_;
596 CGroupContext *unit_get_cgroup_context(Unit *u) _pure_;
598 int unit_write_drop_in(Unit *u, UnitSetPropertiesMode mode, const char *name, const char *data);
599 int unit_write_drop_in_private_section(Unit *u, UnitSetPropertiesMode mode, const char *name, const char *data);
600 int unit_remove_drop_in(Unit *u, UnitSetPropertiesMode mode, const char *name);
602 int unit_kill_context(Unit *u, KillContext *c, bool sigkill, pid_t main_pid, pid_t control_pid, bool main_pid_alien);
604 int unit_make_transient(Unit *u);
606 const char *unit_active_state_to_string(UnitActiveState i) _const_;
607 UnitActiveState unit_active_state_from_string(const char *s) _pure_;
609 const char *unit_dependency_to_string(UnitDependency i) _const_;
610 UnitDependency unit_dependency_from_string(const char *s) _pure_;
612 /* Macros which append UNIT= or USER_UNIT= to the message */
614 #define log_full_unit(level, unit, ...) log_meta_object(level, __FILE__, __LINE__, __func__, getpid() == 1 ? "UNIT=" : "USER_UNIT=", unit, __VA_ARGS__)
615 #define log_debug_unit(unit, ...) log_full_unit(LOG_DEBUG, unit, __VA_ARGS__)
616 #define log_info_unit(unit, ...) log_full_unit(LOG_INFO, unit, __VA_ARGS__)
617 #define log_notice_unit(unit, ...) log_full_unit(LOG_NOTICE, unit, __VA_ARGS__)
618 #define log_warning_unit(unit, ...) log_full_unit(LOG_WARNING, unit, __VA_ARGS__)
619 #define log_error_unit(unit, ...) log_full_unit(LOG_ERR, unit, __VA_ARGS__)
621 #define log_struct_unit(level, unit, ...) log_struct(level, getpid() == 1 ? "UNIT=%s" : "USER_UNIT=%s", unit, __VA_ARGS__)