1 /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
7 This file is part of systemd.
9 Copyright 2010 Lennart Poettering
11 systemd is free software; you can redistribute it and/or modify it
12 under the terms of the GNU General Public License as published by
13 the Free Software Foundation; either version 2 of the License, or
14 (at your option) any later version.
16 systemd is distributed in the hope that it will be useful, but
17 WITHOUT ANY WARRANTY; without even the implied warranty of
18 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
19 General Public License for more details.
21 You should have received a copy of the GNU General Public License
22 along with systemd; If not, see <http://www.gnu.org/licenses/>.
28 typedef union Unit Unit;
29 typedef struct Meta Meta;
30 typedef struct UnitVTable UnitVTable;
31 typedef enum UnitType UnitType;
32 typedef enum UnitLoadState UnitLoadState;
33 typedef enum UnitActiveState UnitActiveState;
34 typedef enum UnitDependency UnitDependency;
39 #include "socket-util.h"
41 #include "condition.h"
43 #define DEFAULT_TIMEOUT_USEC (60*USEC_PER_SEC)
44 #define DEFAULT_RESTART_USEC (100*USEC_PER_MSEC)
58 _UNIT_TYPE_INVALID = -1
68 _UNIT_LOAD_STATE_INVALID = -1
71 enum UnitActiveState {
78 _UNIT_ACTIVE_STATE_MAX,
79 _UNIT_ACTIVE_STATE_INVALID = -1
82 static inline bool UNIT_IS_ACTIVE_OR_RELOADING(UnitActiveState t) {
83 return t == UNIT_ACTIVE || t == UNIT_RELOADING;
86 static inline bool UNIT_IS_ACTIVE_OR_ACTIVATING(UnitActiveState t) {
87 return t == UNIT_ACTIVE || t == UNIT_ACTIVATING || t == UNIT_RELOADING;
90 static inline bool UNIT_IS_INACTIVE_OR_DEACTIVATING(UnitActiveState t) {
91 return t == UNIT_INACTIVE || t == UNIT_FAILED || t == UNIT_DEACTIVATING;
94 static inline bool UNIT_IS_INACTIVE_OR_FAILED(UnitActiveState t) {
95 return t == UNIT_INACTIVE || t == UNIT_FAILED;
99 /* Positive dependencies */
101 UNIT_REQUIRES_OVERRIDABLE,
103 UNIT_REQUISITE_OVERRIDABLE,
107 /* Inverse of the above */
108 UNIT_REQUIRED_BY, /* inverse of 'requires' and 'requisite' is 'required_by' */
109 UNIT_REQUIRED_BY_OVERRIDABLE, /* inverse of 'requires_overridable' and 'requisite_overridable' is 'soft_required_by' */
110 UNIT_WANTED_BY, /* inverse of 'wants' */
111 UNIT_BOUND_BY, /* inverse of 'bind_to' */
113 /* Negative dependencies */
114 UNIT_CONFLICTS, /* inverse of 'conflicts' is 'conflicted_by' */
118 UNIT_BEFORE, /* inverse of 'before' is 'after' and vice versa */
124 /* Reference information for GC logic */
125 UNIT_REFERENCES, /* Inverse of 'references' is 'referenced_by' */
128 _UNIT_DEPENDENCY_MAX,
129 _UNIT_DEPENDENCY_INVALID = -1
140 UnitLoadState load_state;
143 char *id; /* One name is special because we use it for identification. Points to an entry in the names set */
147 Set *dependencies[_UNIT_DEPENDENCY_MAX];
151 char *fragment_path; /* if loaded from a config file this is the primary path to it */
152 usec_t fragment_mtime;
154 /* If there is something to do with this unit, then this is
160 /* Conditions to check */
161 LIST_HEAD(Condition, conditions);
163 dual_timestamp inactive_exit_timestamp;
164 dual_timestamp active_enter_timestamp;
165 dual_timestamp active_exit_timestamp;
166 dual_timestamp inactive_enter_timestamp;
168 /* Counterparts in the cgroup filesystem */
169 CGroupBonding *cgroup_bondings;
172 LIST_FIELDS(Meta, units_per_type);
175 LIST_FIELDS(Meta, load_queue);
178 LIST_FIELDS(Meta, dbus_queue);
181 LIST_FIELDS(Meta, cleanup_queue);
184 LIST_FIELDS(Meta, gc_queue);
186 /* Used during GC sweeps */
189 /* When deserializing, temporarily store the job type for this
190 * unit here, if there was a job scheduled */
191 int deserialized_job; /* This is actually of type JobType */
193 /* Error code when we didn't manage to load the unit (negative) */
196 /* Garbage collect us we nobody wants or requires us anymore */
197 bool stop_when_unneeded;
199 /* Create default depedencies */
200 bool default_dependencies;
202 /* Refuse manual starting, allow starting only indirectly via dependency. */
203 bool refuse_manual_start;
205 /* Don't allow the user to stop this unit manually, allow stopping only indirectly via dependency. */
206 bool refuse_manual_stop;
208 /* Allow isolation requests */
211 bool in_load_queue:1;
212 bool in_dbus_queue:1;
213 bool in_cleanup_queue:1;
216 bool sent_dbus_new_signal:1;
229 #include "automount.h"
230 #include "snapshot.h"
251 /* This should reset all type-specific variables. This should
252 * not allocate memory, and is called with zero-initialized
253 * data. It should hence only initialize variables that need
255 void (*init)(Unit *u);
257 /* This should free all type-specific variables. It should be
259 void (*done)(Unit *u);
261 /* Actually load data from disk. This may fail, and should set
262 * load_state to UNIT_LOADED, UNIT_MERGED or leave it at
263 * UNIT_STUB if no configuration could be found. */
264 int (*load)(Unit *u);
266 /* If a a lot of units got created via enumerate(), this is
267 * where to actually set the state and call unit_notify(). */
268 int (*coldplug)(Unit *u);
270 void (*dump)(Unit *u, FILE *f, const char *prefix);
272 int (*start)(Unit *u);
273 int (*stop)(Unit *u);
274 int (*reload)(Unit *u);
276 int (*kill)(Unit *u, KillWho w, KillMode m, int signo, DBusError *error);
278 bool (*can_reload)(Unit *u);
280 /* Write all data that cannot be restored from other sources
281 * away using unit_serialize_item() */
282 int (*serialize)(Unit *u, FILE *f, FDSet *fds);
284 /* Restore one item from the serialization */
285 int (*deserialize_item)(Unit *u, const char *key, const char *data, FDSet *fds);
287 /* Boils down the more complex internal state of this unit to
288 * a simpler one that the engine can understand */
289 UnitActiveState (*active_state)(Unit *u);
291 /* Returns the substate specific to this unit type as
292 * string. This is purely information so that we can give the
293 * user a more finegrained explanation in which actual state a
295 const char* (*sub_state_to_string)(Unit *u);
297 /* Return true when there is reason to keep this entry around
298 * even nothing references it and it isn't active in any
300 bool (*check_gc)(Unit *u);
302 /* Return true when this unit is suitable for snapshotting */
303 bool (*check_snapshot)(Unit *u);
305 void (*fd_event)(Unit *u, int fd, uint32_t events, Watch *w);
306 void (*sigchld_event)(Unit *u, pid_t pid, int code, int status);
307 void (*timer_event)(Unit *u, uint64_t n_elapsed, Watch *w);
309 /* Reset failed state if we are in failed state */
310 void (*reset_failed)(Unit *u);
312 /* Called whenever any of the cgroups this unit watches for
314 void (*cgroup_notify_empty)(Unit *u);
316 /* Called whenever a process of this unit sends us a message */
317 void (*notify_message)(Unit *u, pid_t pid, char **tags);
319 /* Called whenever a name thus Unit registered for comes or
321 void (*bus_name_owner_change)(Unit *u, const char *name, const char *old_owner, const char *new_owner);
323 /* Called whenever a bus PID lookup finishes */
324 void (*bus_query_pid_done)(Unit *u, const char *name, pid_t pid);
326 /* Called for each message received on the bus */
327 DBusHandlerResult (*bus_message_handler)(Unit *u, DBusConnection *c, DBusMessage *message);
329 /* Return the unit this unit is following */
330 Unit *(*following)(Unit *u);
332 /* This is called for each unit type and should be used to
333 * enumerate existing devices and load them. However,
334 * everything that is loaded here should still stay in
335 * inactive state. It is the job of the coldplug() call above
336 * to put the units into the initial state. */
337 int (*enumerate)(Manager *m);
339 /* Type specific cleanups. */
340 void (*shutdown)(Manager *m);
342 /* When sending out PropertiesChanged signal, which properties
343 * shall be invalidated? This is a NUL separated list of
344 * strings, to minimize relocations a little. */
345 const char *bus_invalidating_properties;
347 /* The interface name */
348 const char *bus_interface;
350 /* Can units of this type have multiple names? */
353 /* If true units of this types can never have "Requires"
354 * dependencies, because state changes can only be observed,
358 /* Instances make no sense for this type */
361 /* Exclude this type from snapshots */
364 /* Exclude from automatic gc */
367 /* Exclude from stopping on isolation requests */
370 /* Show status updates on the console */
374 extern const UnitVTable * const unit_vtable[_UNIT_TYPE_MAX];
376 #define UNIT_VTABLE(u) unit_vtable[(u)->meta.type]
378 /* For casting a unit into the various unit types */
379 #define DEFINE_CAST(UPPERCASE, MixedCase) \
380 static inline MixedCase* UPPERCASE(Unit *u) { \
381 if (_unlikely_(!u || u->meta.type != UNIT_##UPPERCASE)) \
384 return (MixedCase*) u; \
387 /* For casting the various unit types into a unit */
388 #define UNIT(u) ((Unit*) (&(u)->meta))
390 DEFINE_CAST(SOCKET, Socket);
391 DEFINE_CAST(TIMER, Timer);
392 DEFINE_CAST(SERVICE, Service);
393 DEFINE_CAST(TARGET, Target);
394 DEFINE_CAST(DEVICE, Device);
395 DEFINE_CAST(MOUNT, Mount);
396 DEFINE_CAST(AUTOMOUNT, Automount);
397 DEFINE_CAST(SNAPSHOT, Snapshot);
398 DEFINE_CAST(SWAP, Swap);
399 DEFINE_CAST(PATH, Path);
401 Unit *unit_new(Manager *m);
402 void unit_free(Unit *u);
404 int unit_add_name(Unit *u, const char *name);
406 int unit_add_dependency(Unit *u, UnitDependency d, Unit *other, bool add_reference);
407 int unit_add_two_dependencies(Unit *u, UnitDependency d, UnitDependency e, Unit *other, bool add_reference);
409 int unit_add_dependency_by_name(Unit *u, UnitDependency d, const char *name, const char *filename, bool add_reference);
410 int unit_add_two_dependencies_by_name(Unit *u, UnitDependency d, UnitDependency e, const char *name, const char *path, bool add_reference);
412 int unit_add_dependency_by_name_inverse(Unit *u, UnitDependency d, const char *name, const char *filename, bool add_reference);
413 int unit_add_two_dependencies_by_name_inverse(Unit *u, UnitDependency d, UnitDependency e, const char *name, const char *path, bool add_reference);
415 int unit_add_exec_dependencies(Unit *u, ExecContext *c);
417 int unit_add_cgroup(Unit *u, CGroupBonding *b);
418 int unit_add_cgroup_from_text(Unit *u, const char *name);
419 int unit_add_default_cgroup(Unit *u);
420 CGroupBonding* unit_get_default_cgroup(Unit *u);
422 int unit_choose_id(Unit *u, const char *name);
423 int unit_set_description(Unit *u, const char *description);
425 bool unit_check_gc(Unit *u);
427 void unit_add_to_load_queue(Unit *u);
428 void unit_add_to_dbus_queue(Unit *u);
429 void unit_add_to_cleanup_queue(Unit *u);
430 void unit_add_to_gc_queue(Unit *u);
432 int unit_merge(Unit *u, Unit *other);
433 int unit_merge_by_name(Unit *u, const char *other);
435 Unit *unit_follow_merge(Unit *u);
437 int unit_load_fragment_and_dropin(Unit *u);
438 int unit_load_fragment_and_dropin_optional(Unit *u);
439 int unit_load(Unit *unit);
441 const char *unit_description(Unit *u);
443 bool unit_has_name(Unit *u, const char *name);
445 UnitActiveState unit_active_state(Unit *u);
447 const char* unit_sub_state_to_string(Unit *u);
449 void unit_dump(Unit *u, FILE *f, const char *prefix);
451 bool unit_can_reload(Unit *u);
452 bool unit_can_start(Unit *u);
453 bool unit_can_isolate(Unit *u);
455 int unit_start(Unit *u);
456 int unit_stop(Unit *u);
457 int unit_reload(Unit *u);
459 int unit_kill(Unit *u, KillWho w, KillMode m, int signo, DBusError *error);
461 void unit_notify(Unit *u, UnitActiveState os, UnitActiveState ns);
463 int unit_watch_fd(Unit *u, int fd, uint32_t events, Watch *w);
464 void unit_unwatch_fd(Unit *u, Watch *w);
466 int unit_watch_pid(Unit *u, pid_t pid);
467 void unit_unwatch_pid(Unit *u, pid_t pid);
469 int unit_watch_timer(Unit *u, usec_t delay, Watch *w);
470 void unit_unwatch_timer(Unit *u, Watch *w);
472 int unit_watch_bus_name(Unit *u, const char *name);
473 void unit_unwatch_bus_name(Unit *u, const char *name);
475 bool unit_job_is_applicable(Unit *u, JobType j);
477 int set_unit_path(const char *p);
479 char *unit_dbus_path(Unit *u);
481 int unit_load_related_unit(Unit *u, const char *type, Unit **_found);
482 int unit_get_related_unit(Unit *u, const char *type, Unit **_found);
484 char *unit_name_printf(Unit *u, const char* text);
485 char *unit_full_printf(Unit *u, const char *text);
486 char **unit_full_printf_strv(Unit *u, char **l);
488 bool unit_can_serialize(Unit *u);
489 int unit_serialize(Unit *u, FILE *f, FDSet *fds);
490 void unit_serialize_item_format(Unit *u, FILE *f, const char *key, const char *value, ...) _printf_attr_(4,5);
491 void unit_serialize_item(Unit *u, FILE *f, const char *key, const char *value);
492 int unit_deserialize(Unit *u, FILE *f, FDSet *fds);
494 int unit_add_node_link(Unit *u, const char *what, bool wants);
496 int unit_coldplug(Unit *u);
498 void unit_status_printf(Unit *u, const char *format, ...);
500 bool unit_need_daemon_reload(Unit *u);
502 void unit_reset_failed(Unit *u);
504 Unit *unit_following(Unit *u);
506 bool unit_pending_inactive(Unit *u);
507 bool unit_pending_active(Unit *u);
509 int unit_add_default_target_dependency(Unit *u, Unit *target);
511 UnitType unit_name_to_type(const char *n);
512 bool unit_name_is_valid(const char *n, bool template_ok);
514 const char *unit_load_state_to_string(UnitLoadState i);
515 UnitLoadState unit_load_state_from_string(const char *s);
517 const char *unit_active_state_to_string(UnitActiveState i);
518 UnitActiveState unit_active_state_from_string(const char *s);
520 const char *unit_dependency_to_string(UnitDependency i);
521 UnitDependency unit_dependency_from_string(const char *s);